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How to Configure VLAN on Cisco Switch in Cisco Packet Tracer

The VLAN (Virtual LAN) structure is used to divide the physical network topology into logical network segments. When VLANs are configured, the physical network environment provides better performance and better network management.

How to Configure VLAN on Cisco Switch in Cisco Packet Tracer

How to Create and Configure VLANs on Cisco Switch with Packet Tracer

In a physical network environment, you can allocate users in a specific location to logical areas with VLANs. For example, if a 3-floor company has a finance department on each floor, you can configure a VLAN so that you can communicate these departments between floors.

In the actual scenario, users do not take notice of this change when you do this. By simply grouping the existing network logically, you get more network performance, and you can also restrict data traffic between VLAN groups.

You can now follow the steps below to create and configure VLANs on Switches using the simulator software.

First, add a Router, Switch, and six PCs to the Packet Tracer workspace to create a network topology as shown in the image below.

A Network Topology with 3 Separate VLANs

    Step  2

After configuring the Cisco Router’s interface and the TCP/IP settings of the computers, click Switch and click the CLI tab in the window that opens. To change to Privileged mode, execute enable .

Opening the Cisco Switch's CLI Command Prompt

After making the basic settings, create 3 different VLAN groups according to the topology you have created on the Switch. Use the following commands to create a VLAN by topology.

Creating a VLAN

After creating VLANs for departments, you need to make clients connected to the Switch interface to VLANs.

Switch from privileged configuration mode on Cisco Switch to global configuration mode.

To assign clients in the red zone to VLAN10, perform the following commands in order.

Assigning Switch Ports to VLANs

To assign clients in the blue zone to VLAN20, perform the following commands in order.

Adding Switch Ports to VLAN20

To assign clients in the green zone to the VLAN20, perform the following commands in order.

Adding Switch Ports to VLAN30

    Step  7

After adding the Switchport to the VLANs, check the interfaces you have created and made on the Switch with the show vlan command.

Using Show VLAN Command on Switch

Since the network ports of PC0 and PC1 are connected to the VLAN10, you will see that there is a connection when you ping between these computers.

Ping Between Computers on the Same VLAN

When you ping between computers with other VLANs, you will see that the operation failed.

A ping test from PC0 to PC2 which is a member of VLAN20;

Ping from VLAN10 to VLAN20

    Step 10

When you ping PC4 from PC0 to VLAN30 member, ping will fail. The reason ping failed is that no routing has been made between the VLANs.

NOTE: When you configure VLANs on the Layer 2 switch, if there is a Router in the environment, you need to configure the Inter-VLAN .

Ping from VLAN10 to VLAN30

Assigning a Management IP Address to VLANs

By granting a management IP address to VLANs, you can control your devices from the local or remote network.

The ip address command is used in the configuration mode of the port to assign an IP address to the interface of a router. In the Switch, this operation is performed in the settings of the VLAN you will assign IP.

A management IP can be assigned for each VLAN created.

To add management addresses for VLAN10, VLAN20, and VLAN30, addressing the network topology, follow these steps:

In CLI, execute the configure terminal command and then the interface command (name of the vlan) to configure the corresponding VLAN.

Add a Management IP Address to VLANs

You can examine the IP addresses and port states of the interfaces with the show ip interface brief command in the switch.

Executing show ip interface brief in Switch

Pinging from PC0 to VLAN 10 management IP address (192.168.10.100) will be successful as follows.

Ping from PC to VLAN's Management IP

When you ping the VLAN 20 and VLAN 30 IP addresses (192.168.20.100 and 192.168.30.100) from PC0, the operation will fail.

Ping Management Addresses of Other VLANs from PC

Finally, when you ping the management address from PC2, which is a member of VLAN20, the ping will succeed because clients that are members of the same VLAN can communicate.

If you ping the management address of the other VLAN, the operation will still fail.

Ping Other VLANs from PC

Show Commands

      Video

You can watch the video below to create virtual LANs on Packet Tracer and also subscribe to our YouTube channel to support us!

   Final Word

In this article, we have examined how to create VLANs in a Cisco Switch with the simulator program, and assign an IP address to the VLAN. If you want to enable data communication between VLANs, you must activate the Inter-VLAN. Thanks for following us!

   Related Articles

♦ Create a Network ♦ VLAN Routing ♦ SSH ♦ Telnet ♦ DHCP Relay Agent

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assign an ip address to a vlan cisco

Admin asked a question.

For a device with routing capabilities(Nexus 5000, ASA 5000), when should I assign IP address to a VLAN? For redundency/bundling I can assign the ip address to an Etherchannel. I don't quite get the point of assigning an IP to VLAN and have only one port on that VLAN.

  • Enterprise Certifications Community

assign an ip address to a vlan cisco

I believe I answered this question (or one very similar to this one) already in these forums. Take a look here. If the thread doesn't fully address your question, don't hesitate to ask further question.

Furthermore, I believe it's not possible to configure VLANs and VLAN interfaces on the Cisco ASA series, except for the 5505 which is just a switch with some firewalling capabilities. Thus on the ASA you can't but use layer 3 (sub-)interfaces

Technically you never assign an IP address to a VLAN.  More accurately, you assign an IP address to an interface (which may exist on one particular VLAN or on multiple VLANs).

In your ASA example, you may have an interface connected to a trunk port that is on VLANs 10,20 and 30 (for example).  In this case, if hosts on those VLANs need to communicate with the ASA's interface (such as if the ASA was their default gateway) then you need to assign an IP address to each subinterface for each VLAN (e.g. 192.168.10.1, 192.168.20.1 and 192.168.30.1) and enable dot1q support for the interface.

Here is an example (see attached png).

vlansandip.png

Technically, you are correct in that you never assign an IP address to a VLAN but (I'm pretty sure) he means assigning an IP address to a VLAN interface, which you can do on multi-layer switches. I'm not very familiar with the Nexus series of switches but I do believe you can create SVIs so then you can ask the question whether to define a VLAN, create a VLAN interface for this VLAN and assign an IP adddress to it, and finally attach this VLAN to a single interface. The second option would be to make this interface a layer 3-interface and assign it an IP address.

I would definately go with the second option if possible since it's more simple, eliminating pointless VLANs. Now that I think of it, if you create a VLAN and assign it to an interface, it becomes active and an STP instance gets started for it, consuming a little bit of resources of the MLS (multi-layer switch).

Router on a stick doesn't scale well, especially when high availability is required.

What I saw on a pair of 2 Nexus 5K is:

1. VLAN interfaces created and they are assigned an ip address, HSPR enabled on VLAN interface

2. Physical interfaces are in trunk mode, vPC used when possible

The 2 N5Ks are used as default gateway, no physical interface has an ip assigned to it. I guess this way no subinterface is needed, which greatly simplifies management?

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  • Cisco Catalyst 3560-E Series Switches

Published On: August 6ᵗʰ, 2019 02:02

Catalyst 3750-E and 3560-E Switch Software Configuration Guide, 12.2(35)SE2

Assigning the switch ip address and default gateway.

This chapter describes how to create the initial switch configuration (for example, assigning the IP address and default gateway information) by using a variety of automatic and manual methods. It also describes how to modify the switch startup configuration. Unless otherwise noted, the term switch refers to a Catalyst 3750-E or 3560-E standalone switch and to a Catalyst 3750-E switch stack.

This chapter consists of these sections:

Understanding the Boot Process

To start your switch, you need to follow the procedures in the hardware installation guide for installing and powering on the switch and setting up the initial switch configuration (IP address, subnet mask, default gateway, secret and Telnet passwords, and so forth).

The normal boot process involves the operation of the boot loader software, which performs these activities:

The boot loader provides access to the flash file system before the operating system is loaded. Normally, the boot loader is used only to load, uncompress, and start the operating system. After the boot loader gives the operating system control of the CPU, the boot loader is not active until the next system reset or power-on.

The boot loader also provides trap-door access into the system if the operating system has problems serious enough that it cannot be used. The trap-door mechanism provides enough access to the system so that if it is necessary, you can format the flash file system, reinstall the operating system software image by using the Xmodem Protocol, recover from a lost or forgotten password, and finally restart the operating system. For more information, see the "Recovering from a Software Failure" section on page 43-2 and the "Recovering from a Lost or Forgotten Password" section on page 43-3 .

Before you can assign switch information, make sure you have connected a PC or terminal to the console port or a PC to the Ethernet management port, and make sure you have configured the PC or terminal-emulation software baud rate and character format to match these of the switch console port:

Assigning Switch Information

You can assign IP information through the switch setup program, through a DHCP server, or manually.

Use the switch setup program if you want to be prompted for specific IP information. With this program, you can also configure a hostname and an enable secret password. It gives you the option of assigning a Telnet password (to provide security during remote management) and configuring your switch as a command or member switch of a cluster or as a standalone switch. For more information about the setup program, see the hardware installation guide.

The switch stack is managed through a single IP address. The IP address is a system-level setting and is not specific to the stack master or to any other stack member. You can still manage the stack through the same IP address even if you remove the stack master or any other stack member from the stack, provided there is IP connectivity.

Use a DHCP server for centralized control and automatic assignment of IP information after the server is configured.

If you are an experienced user familiar with the switch configuration steps, manually configure the switch. Otherwise, use the setup program described previously.

These sections contain this configuration information:

Default Switch Information

Table 3-1 shows the default switch information.

Table 3-1 Default Switch Information

Understanding DHCP-Based Autoconfiguration

DHCP provides configuration information to Internet hosts and internetworking devices. This protocol consists of two components: one for delivering configuration parameters from a DHCP server to a device and a mechanism for allocating network addresses to devices. DHCP is built on a client-server model, in which designated DHCP servers allocate network addresses and deliver configuration parameters to dynamically configured devices. The switch can act as both a DHCP client and a DHCP server.

During DHCP-based autoconfiguration, your switch (DHCP client) is automatically configured at startup with IP address information and a configuration file.

With DHCP-based autoconfiguration, no DHCP client-side configuration is needed on your switch. However, you need to configure the DHCP server for various lease options associated with IP addresses. If you are using DHCP to relay the configuration file location on the network, you might also need to configure a Trivial File Transfer Protocol (TFTP) server and a Domain Name System (DNS) server.

The DHCP server for your switch can be on the same LAN or on a different LAN than the switch. If the DHCP server is running on a different LAN, you should configure a DHCP relay device between your switch and the DHCP server. A relay device forwards broadcast traffic between two directly connected LANs. A router does not forward broadcast packets, but it forwards packets based on the destination IP address in the received packet.

DHCP-based autoconfiguration replaces the BOOTP client functionality on your switch.

DHCP Client Request Process

When you boot your switch, the DHCP client is invoked and requests configuration information from a DHCP server when the configuration file is not present on the switch. If the configuration file is present and the configuration includes the ip address dhcp interface configuration command on specific routed interfaces, the DHCP client is invoked and requests the IP address information for those interfaces.

Figure 3-1 shows the sequence of messages that are exchanged between the DHCP client and the DHCP server.

Figure 3-1 DHCP Client and Server Message Exchange

assign an ip address to a vlan cisco

The client, Switch A, broadcasts a DHCPDISCOVER message to locate a DHCP server. The DHCP server offers configuration parameters (such as an IP address, subnet mask, gateway IP address, DNS IP address, a lease for the IP address, and so forth) to the client in a DHCPOFFER unicast message.

In a DHCPREQUEST broadcast message, the client returns a formal request for the offered configuration information to the DHCP server. The formal request is broadcast so that all other DHCP servers that received the DHCPDISCOVER broadcast message from the client can reclaim the IP addresses that they offered to the client.

The DHCP server confirms that the IP address has been allocated to the client by returning a DHCPACK unicast message to the client. With this message, the client and server are bound, and the client uses configuration information received from the server. The amount of information the switch receives depends on how you configure the DHCP server. For more information, see the "Configuring the TFTP Server" section .

If the configuration parameters sent to the client in the DHCPOFFER unicast message are invalid (a configuration error exists), the client returns a DHCPDECLINE broadcast message to the DHCP server.

The DHCP server sends the client a DHCPNAK denial broadcast message, which means that the offered configuration parameters have not been assigned, that an error has occurred during the negotiation of the parameters, or that the client has been slow in responding to the DHCPOFFER message (the DHCP server assigned the parameters to another client).

A DHCP client might receive offers from multiple DHCP or BOOTP servers and can accept any of the offers; however, the client usually accepts the first offer it receives. The offer from the DHCP server is not a guarantee that the IP address is allocated to the client; however, the server usually reserves the address until the client has had a chance to formally request the address. If the switch accepts replies from a BOOTP server and configures itself, the switch broadcasts, instead of unicasts, TFTP requests to obtain the switch configuration file.

Configuring DHCP-Based Autoconfiguration

If your DHCP server is a Cisco device, see the "Configuring DHCP" section of the "IP Addressing and Services" section of the Cisco IOS IP Configuration Guide, Release 12.2 for additional information about configuring DHCP.

DHCP Server Configuration Guidelines

Follow these guidelines if you are configuring a device as a DHCP server:

You should configure the DHCP server with reserved leases that are bound to each switch by the switch hardware address.

If you want the switch to receive IP address information, you must configure the DHCP server with these lease options:

If you want the switch to receive the configuration file from a TFTP server, you must configure the DHCP server with these lease options:

Depending on the settings of the DHCP server, the switch can receive IP address information, the configuration file, or both.

If you do not configure the DHCP server with the lease options described previously, it replies to client requests with only those parameters that are configured. If the IP address and the subnet mask are not in the reply, the switch is not configured. If the router IP address or the TFTP server name are not found, the switch might send broadcast, instead of unicast, TFTP requests. Unavailability of other lease options does not affect autoconfiguration.

Configuring the TFTP Server

Based on the DHCP server configuration, the switch attempts to download one or more configuration files from the TFTP server. If you configured the DHCP server to respond to the switch with all the options required for IP connectivity to the TFTP server, and if you configured the DHCP server with a TFTP server name, address, and configuration filename, the switch attempts to download the specified configuration file from the specified TFTP server.

If you did not specify the configuration filename, the TFTP server, or if the configuration file could not be downloaded, the switch attempts to download a configuration file by using various combinations of filenames and TFTP server addresses. The files include the specified configuration filename (if any) and these files: network-config, cisconet.cfg, hostname .config, or hostname .cfg, where hostname is the switch's current hostname. The TFTP server addresses used include the specified TFTP server address (if any) and the broadcast address (255.255.255.255).

For the switch to successfully download a configuration file, the TFTP server must contain one or more configuration files in its base directory. The files can include these files:

If you specify the TFTP server name in the DHCP server-lease database, you must also configure the TFTP server name-to-IP-address mapping in the DNS-server database.

If the TFTP server to be used is on a different LAN from the switch, or if it is to be accessed by the switch through the broadcast address (which occurs if the DHCP server response does not contain all the required information described previously), a relay must be configured to forward the TFTP packets to the TFTP server. For more information, see the "Configuring the Relay Device" section . The preferred solution is to configure the DHCP server with all the required information.

Configuring the DNS

The DHCP server uses the DNS server to resolve the TFTP server name to an IP address. You must configure the TFTP server name-to-IP address map on the DNS server. The TFTP server contains the configuration files for the switch.

You can configure the IP addresses of the DNS servers in the lease database of the DHCP server from where the DHCP replies will retrieve them. You can enter up to two DNS server IP addresses in the lease database.

The DNS server can be on the same or on a different LAN as the switch. If it is on a different LAN, the switch must be able to access it through a router.

Configuring the Relay Device

You must configure a relay device, also referred to as a relay agent , when a switch sends broadcast packets that require a response from a host on a different LAN. Examples of broadcast packets that the switch might send are DHCP, DNS, and in some cases, TFTP packets. You must configure this relay device to forward received broadcast packets on an interface to the destination host.

If the relay device is a Cisco router, enable IP routing ( ip routing global configuration command), and configure helper addresses by using the ip helper-address interface configuration command.

For example, in Figure 3-2 , configure the router interfaces as follows:

On interface 10.0.0.2:

On interface 20.0.0.1

Figure 3-2 Relay Device Used in Autoconfiguration

assign an ip address to a vlan cisco

Obtaining Configuration Files

Depending on the availability of the IP address and the configuration filename in the DHCP reserved lease, the switch obtains its configuration information in these ways:

The switch receives its IP address, subnet mask, TFTP server address, and the configuration filename from the DHCP server. The switch sends a unicast message to the TFTP server to retrieve the named configuration file from the base directory of the server and upon receipt, it completes its boot-up process.

The switch receives its IP address, subnet mask, and the configuration filename from the DHCP server. The switch sends a broadcast message to a TFTP server to retrieve the named configuration file from the base directory of the server, and upon receipt, it completes its boot-up process.

The switch receives its IP address, subnet mask, and the TFTP server address from the DHCP server. The switch sends a unicast message to the TFTP server to retrieve the network-confg or cisconet.cfg default configuration file. (If the network-confg file cannot be read, the switch reads the cisconet.cfg file.)

The default configuration file contains the hostnames-to-IP-address mapping for the switch. The switch fills its host table with the information in the file and obtains its hostname. If the hostname is not found in the file, the switch uses the hostname in the DHCP reply. If the hostname is not specified in the DHCP reply, the switch uses the default Switch as its hostname.

After obtaining its hostname from the default configuration file or the DHCP reply, the switch reads the configuration file that has the same name as its hostname ( hostname -confg or hostname .cfg, depending on whether network-confg or cisconet.cfg was read earlier) from the TFTP server. If the cisconet.cfg file is read, the filename of the host is truncated to eight characters.

If the switch cannot read the network-confg, cisconet.cfg, or the hostname file, it reads the router-confg file. If the switch cannot read the router-confg file, it reads the ciscortr.cfg file.

Example Configuration

Figure 3-3 shows a sample network for retrieving IP information by using DHCP-based autoconfiguration.

Figure 3-3 DHCP-Based Autoconfiguration Network Example

assign an ip address to a vlan cisco

Table 3-2 shows the configuration of the reserved leases on the DHCP server.

Table 3-2 DHCP Server Configuration

DNS Server Configuration

The DNS server maps the TFTP server name tftpserver to IP address 10.0.0.3.

TFTP Server Configuration (on UNIX)

The TFTP server base directory is set to /tftpserver/work/. This directory contains the network-confg file used in the two-file read method. This file contains the hostname to be assigned to the switch based on its IP address. The base directory also contains a configuration file for each switch ( switcha-confg , switchb-confg , and so forth) as shown in this display:

DHCP Client Configuration

No configuration file is present on Switch A through Switch D.

Configuration Explanation

In Figure 3-3 , Switch A reads its configuration file as follows:

Switches B through D retrieve their configuration files and IP addresses in the same way.

Manually Assigning IP Information

Beginning in privileged EXEC mode, follow these steps to manually assign IP information to multiple switched virtual interfaces (SVIs):

To remove the switch IP address, use the no ip address interface configuration command. If you are removing the address through a Telnet session, your connection to the switch will be lost. To remove the default gateway address, use the no ip default-gateway global configuration command.

For information on setting the switch system name, protecting access to privileged EXEC commands, and setting time and calendar services, see "Administering the Switch."

Checking and Saving the Running Configuration

You can check the configuration settings you entered or changes you made by entering this privileged EXEC command:

To store the configuration or changes you have made to your startup configuration in flash memory, enter this privileged EXEC command:

This command saves the configuration settings that you made. If you fail to do this, your configuration will be lost the next time you reload the system. To display information stored in the NVRAM section of flash memory, use the show startup-config or more startup-config privileged EXEC command.

For more information about alternative locations from which to copy the configuration file, see "Working with the Cisco IOS File System, Configuration Files, and Software Images."

Modifying the Startup Configuration

These sections describe how to modify the switch startup configuration:

See also "Working with the Cisco IOS File System, Configuration Files, and Software Images," for information about switch configuration files. See the "Switch Stack Configuration Files" section on page 5-15 for information about switch stack configuration files.

Default Boot Configuration

Table 3-3 shows the default boot configuration.

Table 3-3 Default Boot Configuration

Automatically Downloading a Configuration File

You can automatically download a configuration file to your switch by using the DHCP-based autoconfiguration feature. For more information, see the "Understanding DHCP-Based Autoconfiguration" section .

Specifying the Filename to Read and Write the System Configuration

By default, the Cisco IOS software uses the file config.text to read and write a nonvolatile copy of the system configuration. However, you can specify a different filename, which will be loaded during the next boot cycle.

Beginning in privileged EXEC mode, follow these steps to specify a different configuration filename:

To return to the default setting, use the no boot config-file global configuration command.

Booting Manually

By default, the switch automatically boots; however, you can configure it to manually boot.

Beginning in privileged EXEC mode, follow these steps to configure the switch to manually boot during the next boot cycle:

To disable manual booting, use the no boot manual global configuration command.

Booting a Specific Software Image

By default, the switch attempts to automatically boot the system using information in the BOOT environment variable. If this variable is not set, the switch attempts to load and execute the first executable image it can by performing a recursive, depth-first search throughout the flash file system. In a depth-first search of a directory, each encountered subdirectory is completely searched before continuing the search in the original directory. However, you can specify a specific image to boot.

Beginning in privileged EXEC mode, follow these steps to configure the switch to boot a specific image during the next boot cycle:

To return to the default setting, use the no boot system global configuration command.

Controlling Environment Variables

With a normally operating switch, you enter the boot loader mode only through a switch console connection configured for 9600 bps. Unplug the switch power cord, and press the switch Mode button while reconnecting the power cord. You can release the Mode button a second or two after the LED above port 1 turns off. Then the boot loader switch: prompt appears.

The switch boot loader software provides support for nonvolatile environment variables, which can be used to control how the boot loader, or any other software running on the system, behaves. Boot loader environment variables are similar to environment variables that can be set on UNIX or DOS systems.

Environment variables that have values are stored in flash memory outside of the flash file system.

Each line in these files contains an environment variable name and an equal sign followed by the value of the variable. A variable has no value if it is not listed in this file; it has a value if it is listed in the file even if the value is a null string. A variable that is set to a null string (for example, " ") is a variable with a value. Many environment variables are predefined and have default values.

Environment variables store two kinds of data:

You can change the settings of the environment variables by accessing the boot loader or by using Cisco IOS commands. Under normal circumstances, it is not necessary to alter the setting of the environment variables.

Table 3-4 describes the function of the most common environment variables.

Table 3-4 Environment Variables

When the switch is connected to a PC through the Ethernet management port, you can download or upload a configuration file to the boot loader by using TFTP. Make sure the environment variables in Table 3-5 are configured.

Table 3-5 Environment Variables for TFTP

Scheduling a Reload of the Software Image

You can schedule a reload of the software image to occur on the switch at a later time (for example, late at night or during the weekend when the switch is used less), or you can synchronize a reload network-wide (for example, to perform a software upgrade on all switches in the network).

Configuring a Scheduled Reload

To configure your switch to reload the software image at a later time, use one of these commands in privileged EXEC mode:

This command schedules a reload of the software to take affect in the specified minutes or hours and minutes. The reload must take place within approximately 24 days. You can specify the reason for the reload in a string up to 255 characters in length.

To reload a specific switch in a switch stack, use the reload slot stack-member-number privileged EXEC command.

This command schedules a reload of the software to take place at the specified time (using a 24-hour clock). If you specify the month and day, the reload is scheduled to take place at the specified time and date. If you do not specify the month and day, the reload takes place at the specified time on the current day (if the specified time is later than the current time) or on the next day (if the specified time is earlier than the current time). Specifying 00:00 schedules the reload for midnight.

The reload command halts the system. If the system is not set to manually boot, it reboots itself. Use the reload command after you save the switch configuration information to the startup configuration ( copy running-config startup-config ).

If your switch is configured for manual booting, do not reload it from a virtual terminal. This restriction prevents the switch from entering the boot loader mode and thereby taking it from the remote user's control.

If you modify your configuration file, the switch prompts you to save the configuration before reloading. During the save operation, the system requests whether you want to proceed with the save if the CONFIG_FILE environment variable points to a startup configuration file that no longer exists. If you proceed in this situation, the system enters setup mode upon reload.

This example shows how to reload the software on the switch on the current day at 7:30 p.m:

This example shows how to reload the software on the switch at a future time:

To cancel a previously scheduled reload, use the reload cancel privileged EXEC command.

Displaying Scheduled Reload Information

To display information about a previously scheduled reload or to find out if a reload has been scheduled on the switch, use the show reload privileged EXEC command.

It displays reload information including the time the reload is scheduled to occur and the reason for the reload (if it was specified when the reload was scheduled).

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Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE Dublin 17.12.x

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The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

  • Overview of the Controller
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  • Wireless Management Interface
  • BIOS Protection
  • Smart Licensing Using Policy
  • Management over Wireless
  • Boot Integrity Visibility
  • SUDI99 Certificate Support
  • Link Aggregation Group
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  • N+1 Hitless Rolling AP Upgrade
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  • Target Wake Time
  • Enabling USB Port on Access Points
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  • Accounting Identity List
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  • Volume Metering
  • Enabling Syslog Messages in Access Points and Controller for Syslog Server
  • Login Banner
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  • Web-Based Authentication
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  • Private Shared Key
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  • Local Extensible Authentication Protocol
  • Local EAP Ciphersuite
  • Authentication and Authorization Between Multiple RADIUS Servers
  • CUI Information in RADIUS Accounting
  • Secure LDAP
  • Network Access Server Identifier
  • Locally Significant Certificates
  • Certificate Management
  • Controller Self-Signed Certificate for Wireless AP Join
  • Managing Rogue Devices
  • Classifying Rogue Access Points
  • Advanced WIPS
  • Cisco TrustSec
  • SGT Inline Tagging and SXPv4
  • Multiple Cipher Support
  • Configuring Secure Shell
  • Encrypted Traffic Analytics
  • Internet Protocol Security
  • Transport Layer Security Tunnel Support
  • Configuring RFC 5580 Location Attributes
  • IP MAC Binding
  • Disabling IP Learning in FlexConnect Mode
  • Disabling Device Tracking to Support NAC Devices
  • Disabling IP Learning in Local Mode
  • NAT Support on Mobility Groups
  • Static IP Client Mobility
  • Mobility Domain ID - Dot11i Roaming
  • 802.11r Support for Flex Local Authentication
  • Opportunistic Key Caching
  • High Availability
  • Quality of Service
  • Wireless Auto-QoS
  • Native Profiling
  • Air Time Fairness
  • IPv6 Non-AVC QoS Support
  • QoS Basic Service Set Load
  • IPv6 Client IP Address Learning
  • IPv6 Client Mobility
  • IPv6 Support on Flex and Mesh
  • IPv6 CAPWAP UDP Lite Support
  • Neighbor Discovery Proxy
  • Address Resolution Protocol Proxy
  • IPv6 Ready Certification
  • Cisco CleanAir
  • Bluetooth Low Energy
  • Persistent Device Avoidance
  • Spectrum Intelligence
  • Spectrum Analysis
  • Mesh Access Points
  • Redundant Root Access Point (RAP) Ethernet Daisy Chaining
  • VideoStream
  • Software-Defined Access Wireless
  • Passive Client
  • Fabric in a Box with External Fabric Edge

VLAN Groups

  • WLAN Security
  • Remote LANs
  • RLAN External Module
  • 802.11ax Per WLAN
  • BSS Coloring
  • DHCP for WLANs
  • Aironet Extensions IE (CCX IE)
  • Device Analytics
  • Device Classifier Dynamic XML Support
  • BSSID Counters
  • Workgroup Bridges
  • Peer-to-Peer Client Support
  • Deny Wireless Client Session Establishment Using Calendar Profiles
  • Ethernet over GRE
  • Wireless Guest Access
  • Wired Guest Access
  • Express Wi-Fi by Facebook
  • User Defined Network
  • Hotspot 2.0
  • Client Roaming Across Policy Profile
  • Assisted Roaming
  • 802.11r BSS Fast Transition
  • Virtual Routing and Forwarding
  • Cisco Catalyst Center Service for Bonjour Solution Overview
  • Configuring Local and Wide Area Bonjour Domains
  • Configuring Local Area Bonjour for Wireless Local Mode
  • Configuring Local Area Bonjour for Wireless FlexConnect Mode
  • Configuration Example for Local Mode - Wireless and Wired
  • Configuration Example for FlexConnect Mode - Wireless and Wired
  • Multicast Domain Name System

Clear Contents of Search

Chapter: VLAN Groups

Information about vlan groups, prerequisites for vlan groups, restrictions for vlan groups, creating a vlan group (gui), creating a vlan group (cli), adding a vlan group to policy profile (gui), adding a vlan group to a policy profile, viewing the vlans in a vlan group, supported features.

Whenever a client connects to a wireless network (WLAN), the client is placed in a VLAN that is associated with the policy profile mapped to the WLAN. In a large venue, such as an auditorium, a stadium, or a conference room where there are numerous wireless clients, having only a single WLAN to accommodate many clients might be a challenge.

The VLAN group feature uses a single policy profile that can support multiple VLANs. The clients can get assigned to one of the configured VLANs. This feature maps a policy profile to a single VLAN or multiple VLANs using the VLAN groups. When a wireless client associates to the WLAN, the VLAN is derived by an algorithm based on the MAC address of the wireless client. A VLAN is assigned to the client and the client gets the IP address from the assigned VLAN.

The system marks VLAN as Dirty for 30 minutes when the clients are unable to receive IP addresses using DHCP. The system might not clear the Dirty flag from the VLAN even after 30 minutes for a VLAN group. After 30 minutes, when the VLAN is marked non-dirty, new clients in the IP Learn state can get assigned with IP addresses from the VLAN if free IPs are available in the pool and DHCP scope is defined correctly. This is the expected behavior because the timestamp of each interface has to be checked to see if it is greater than 30 minutes, due to which there is a lag of 5 minutes for the global timer to expire.

A VLAN should be present in the device for it to be added to the VLAN group.

If the number of VLANs in a VLAN group exceeds 32, the mobility functionality might not work as expected and Layer 2 multicast might break for some VLANs. Therefore, it is the responsibility of network administrators to configure a feasible number of VLANs in a VLAN group.

For the VLAN Groups feature to work as expected, the VLANs mapped in a group must be present in the controller.

The VLAN Groups feature works for access points in local mode.

The VLAN Groups feature works only in central switching mode and it cannot be used in FlexConnect local switching mode.

ARP Broadcast feature is not supported on VLAN groups.

VLAN group Multicast with VLAN group is only supported in local mode AP. Multicast VLAN is required when VLAN group is configured and uses multicast traffic.

While you configure VLAN groups with multiple VLANs and each VLAN is used by a different subnet, clients having static IP addresses might be assigned to a wrong VLAN if SVIs are not present on the controller. Hence, for every VLAN that belongs to the VLAN group, ensure that you configure an SVI interface with a valid IP address.

Policy profile broadly consists of network and switching policies. Policy profile is a reusable entity across tags. Anything that is a policy for the client that is applied on the AP or controller is moved to the policy profile. For example, VLAN, ACL, QOS, Session timeout, Idle timeout, AVC profile, Bonjour profile, Local profiling, Device classification, BSSID QoS, etc. However, all wireless related security attributes and features on the WLAN are grouped under the WLAN profile.

VLAN Group Support for DHCP and Static IP Clients

When a static IP client joins a VLAN group, the controller adds it to a VLAN based on VLAN computation logic. If the client's static IP address isn't part of the VLAN's IP list, the client fails to get internet access, even if the client is authenticated and authorized. The VLAN Group to Support DHCP and Static IP Clients feature aims to handle the network access of such clients. This feature only supports IPv4 clients and is enabled by default. However, ensure that the ipv4 dhcp required command is not configured on the wireless policy profile, because this disables the feature, causing the client to be stuck in the IP learn state.

Prerequisites

Ensure that a switch VLAN interface (SVI) is configured with the IP address.

Restrictions

FlexConnect local switching and FlexConnect local authentication are not supported. Only Local mode, FlexConnect central switching, and FlexConnect central authentication are supported.

IPv6 is not supported.

The peer controller cannot have a VLAN group in the policy profile, because a VLAN group with static IP mobility is not supported.

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Why does a VLAN have an IP address?

A dumb question for the majority, but I am interested to know "why does a VLAN have an IP address?"

Is this address different from the default gateway? Or is this address, same as broadcast address for this VLAN?

IP address 192.168.4.100 255.255.255.0

splattne's user avatar

  • What kind of hardware are you talking about? –  Bill Weiss Mar 2, 2010 at 21:56
  • This is part of configuring a vlan on a netgear switch, after enabling routing on the vlan. –  RainDoctor Mar 2, 2010 at 22:15

7 Answers 7

I believe this is merely an IP address for the VLAN-aware device that happens to be on that VLAN. You need it if the device in question is going to be doing routing involving that VLAN, or if you expect to manage the device (ie through SNMP) on that VLAN.

(after your update) I see you are enabling routing through the Netgear switch this VLAN is defined on. This IP is the address that local systems will use as the router.

David Mackintosh's user avatar

A VLAN doesn't have an IP address. It's the devices communicating on the VLAN which have IP addresses

Dominik's user avatar

  • 6 +1 - A vlan (an 802.1q vlan anyway) in and of itself doesn't have any IP addresses: It's an ethernet-header-level thing and doesn't much care what you're running on top of it (IP, IPX/SPX, whatever). VLAN-aware devices tend to be managed devices though, and they usually have IP addresses like David said in the other answer. –  voretaq7 Mar 2, 2010 at 20:30

You can think of a VLAN as a network if that helps. So where I work we have all kinds of networks, ones for PLCs, Servers, Networking Devices, Wireless, etc. To make things easy with our networking environment we created VLANs for each one of these. This way we can have multiple devices from each main category connected to any switch we want but we can have that device in it's own VLAN.

In other words, without VLANs you would need a lot more networking devices because each access layer switch would have to be on it's own network, just like your home network. Any switch(es) you plug into your router or modem at home is going to be on the same network. With VLANs we can plug a server, PLC, regular user, and wireless AP into the same switch if needed and still have them all be in their respective VLANs.

VLANs themselves do not have IPs assigned to them like computers and servers do. Instead they are assigned networks. Which is why many people exchange the word VLAN for network and vice versa. So at home your probably have a 192.168.0.0 255.255.255.0 network or something similar. Well for VLANs we do the same thing...

We might assign 192.168.1.0 255.255.255.0 to servers, 192.168.2.0 255.255.255.0 to PLCs, 192.168.3.0 255.255.255.0 to regular users, and 192.168.4.0 255.255.255.0 to wireless. This means a server will get a different IP than a PLC, etc. Thus our segregation with VLANs. And if you understand how IPs and Subnet masks work, you will know that each VLAN above will have its own network and communication and be separate from each other.

Your IP you mentioned above, 192.168.4.100 255.255.255.0, is likely an IP within a VLAN and not a gateway for that VLAN or anything like that. Typically the gateway is the first or last usable IP in the network range but it doesn't have to be. The broadcast address is always the last IP in the range and can never be assigned to anything, in your case the broadcast IP would be 192.168.4.255.

I hope this ramble helps...

chicks's user avatar

From the wikipedia (since it says it well):

Virtual LANs are essentially Layer 2 constructs, compared with IP subnets which are Layer 3 constructs. In an environment employing VLANs, a one-to-one relationship often exists between VLANs and IP subnets, although it is possible to have multiple subnets on one VLAN or have one subnet spread across multiple VLANs. Virtual LANs and IP subnets provide independent Layer 2 and Layer 3 constructs that map to one another and this correspondence is useful during the network design process.

The IP address the OP listed as:

ip address 192.168.4.100 255.255.255.0

This would indeed be the IP addressed assigned to the VLAN itself. Specifically, it is the IP address of the "switch" the VLAN is on. It doesn't necessarily have to be the gateway IP for the VLAN but typically is since you typically setup IP addresses on the VLAN at the Layer 3 "router" for the VLAN and thus use this IP address for the gateway for clients on that VLAN. The Layer3 switch will have IP routing/forwarding enabled if necessary.

The mask basically says that the VLAN is the 192.168.4.0/24 network. It's up to you to decide if you want to actually use the 192.168.4.100 as the actual client gateway IP or if this is simply a management IP for the switch/vlan.

TheCleaner's user avatar

For most Level 3 switches out there, the line you specified represents the gateway address of the VLAN.

Don't confuse it with default gateway, which only applies when routing is turned OFF.

jackbean's user avatar

Informally, yes, a VLAN can have an IP address. Technically this is called a VLAN interface, as you configure it from interface configuration mode and it will be listed in the config as interface VLAN 100 (example). These are virtual interfaces (not physical ports) and are named "VLAN #"

On a layer two switch you are generally limited to only having one active VLAN interface. On a multilayer switch there can be multiple. These VLAN interfaces are virtual interfaces and can be pinged as well as provide the connection point for remote management. This IP address can only be used as the default gateway on a multilayer switch.

A VLAN (Virtual Local Area Network) is its own logically segregated broadcast domain. You assign networks, or subnets, just as you would with a physically separated broadcast domain.

David's user avatar

@TheCleaner:

This would indeed be the IP addressed assigned to the VLAN itself

VLANs do not really have IP addresses assigned to them. They have a network assigned to them, or a subnet, or a network range, however you want to refer to it. The address the OP supplied us is an assignable address within the range of 192.168.4.1-255. So lets say the range is applied to a group of servers so on a Cisco switch and we give the VLAN a description of "Server VLAN", 4.100 would be an address that can be given to an individual server. When referring to the Server VLAN, generally one may use the VLAN number or the network address, but typically not a specific address and the whole mask. At least the network admins I work with do not.

As I mentioned above, the OPs address can be a gateway address, but typically would not be because when you think of an environment like a large corporation, if you do not have a system of how gateway addresses are assigned, keeping track of them can be rather difficult. Thus most network admins use the first or last assignable address of a given range for the gateway. In the case of the OP, that would be 192.168.4.1 or 192.168.4.254. I'm not saying this is always the case, rather best practice and generally makes the most sense.

Specifically, it is the IP address of the "switch" the VLAN is on. It doesn't necessarily have to be the gateway IP for the VLAN but typically is since you typically setup IP addresses on the VLAN at the Layer 3 "router" for the VLAN and thus use this IP address for the gateway for clients on that VLAN.

This statement is confusing to me. We don't know anything about the address the OP gave us except the range it exists in, because the OP never said on what device it was found. We do not know if it is the address of a switch, a server, an AP, a computer, a printer, etc. So how you would know that from the small post from the OP wrote is beyond me.

I agree it doesn't have to be the gateway and I have already mentioned this. As I already explained, when you look at most large companies (but this is Cisco's best practice and is usually applied to most businesses) you actually find that gateway addresses will be the last or first assignable address in a range. 4.100 would be in the middle and would make no sense to be a gateway address. While some network admins might assign it that way, keeping track of this would be cumbersome, especially in increasing network sizes. This becomes even more true when HSRP and such technologies are used which take up two address on each layer 3 interface and give out a third address for the gateway. Keeping track of hundreds of such gateways when HSRP is being used becomes very difficult if there isn't a system for assigning addresses. Think of a company that might have 100 different VLANs...

  • 1 @"this statement is confusing to me"...the OP clarified in his comments that it was an IP on the netgear switch...that's how I knew. –  TheCleaner Mar 7, 2010 at 2:49
  • Yes he did, I just saw that. With a /24 I have to say that is an odd IP to use as a mask. I know some home routers can configure themselves that way, but in a business environment it seems to make more sense to stick to the last or first usable IP of a range. –  Webs Mar 9, 2010 at 16:24

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ASDM Book 3: Cisco Secure Firewall ASA Series VPN ASDM Configuration Guide, 7.18

Bias-free language.

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

  • About This Guide
  • VPN Wizards
  • High Availability Options
  • General VPN Setup

IP Addresses for VPNs

  • Dynamic Access Policies
  • Email Proxy
  • Monitor VPN
  • SSL Settings
  • Virtual Tunnel Interface
  • Configure an External AAA Server for VPN

Clear Contents of Search

Chapter: IP Addresses for VPNs

Configure ip address assignment options, view address assignment methods, configure local ipv4 address pools, configure local ipv6 address pools, assign internal address pools to group policies, configure dhcp addressing, assign ip addresses to local users, configure an ip address assignment policy.

The ASA can use one or more of the following methods for assigning IP addresses to remote access clients. If you configure more than one address assignment method, the ASA searches each of the options until it finds an IP address. By default, all methods are enabled.

Use authentication server — Retrieves addresses from an external authentication, authorization, and accounting server on a per-user basis. If you are using an authentication server that has IP addresses configured, we recommend using this method. You can configure AAA servers in the Configuration > AAA Setup pane. This method is available for IPv4 and IPv6 assignment policies.

Use DHCP — Obtains IP addresses from a DHCP server. If you want to use DHCP, you must configure a DHCP server. You must also define the range of IP addresses that the DHCP server can use. If you use DHCP, configure the server in the Configuration > Remote Access VPN > DHCP Server pane. This method is available for IPv4 assignment policies.

Use an internal address pool — Internally configured address pools are the easiest method of address pool assignment to configure. If you use this method, configure the IP address pools in Configuration > Remote Access VPN > Network (Client) Access > Address Assignment > Address Pools pane. This method is available for IPv4 and IPv6 assignment policies.

Allow the reuse of an IP address so many minutes after it is released—Delays the reuse of an IP address after its return to the address pool. Adding a delay helps to prevent problems firewalls can experience when an IP address is reassigned quickly. By default , this is unchecked, meaning the ASA does not impose a delay. If you want one, check the box and enter the number of minutes in the range 1 - 480 to delay IP address reassignment. This configurable element is available for IPv4 assignment policies.

Use one of the following methods to specify a way to assign IP addresses to remote access clients.

Configure Local IP Address Pools

To configure IPv4 or IPv6 address pools for VPN remote access tunnels, open ASDM and choose Configuration > Remote Access VPN > Network (Client) Access > Address Management > Address Pools > Add/Edit IP Pool . To delete an address pool, open ASDM and choose Configuration > Remote Access VPN > Network (Client) Access > Address Management > Address Pools . Select the address pool you want to delete and click Delete .

The ASA uses address pools based on the connection profile or group policy for the connection. The order in which you specify the pools is important. If you configure more than one address pool for a connection profile or group policy, the ASA uses them in the order in which you added them to the ASA.

If you assign addresses from a non-local subnet, we suggest that you add pools that fall on subnet boundaries to make adding routes for these networks easier.

The IP Pool area shows the configured address pools by name with their IP address range, for example: 10.10.147.100 to 10.10.147.177. If no pools exist, the area is empty. The ASA uses these pools in the order listed: if all addresses in the first pool have been assigned, it uses the next pool, and so on.

The IP Pool area shows the configured address pools by name with a starting IP address range, the address prefix, and the number of addresses configurable in the pool. If no pools exist, the area is empty. The ASA uses these pools in the order listed: if all addresses in the first pool have been assigned, it uses the next pool, and so on.

The Add or Edit Group Policy dialog box lets you specify address pools, tunneling protocols, filters, connection settings, and servers for the internal Network (Client) Access group policy being added or modified. For each of the fields in this dialog box, checking the Inherit check box lets the corresponding setting take its value from the default group policy. Inherit is the default value for all the attributes in this dialog box.

You can configure both IPv4 and IPv6 address pools for the same group policy. If both versions of IP addresses are configured in the same group policy, clients configured for IPv4 will get an IPv4 address, clients configured for IPv6 will get an IPv6 address, and clients configured for both IPv4 and IPv6 addresses will get both an IPv4 and an IPv6 address.

To use DHCP to assign addresses for VPN clients, you must first configure a DHCP server and the range of IP addresses that the DHCP server can use. Then you define the DHCP server on a connection profile basis. Optionally, you can also define a DHCP network scope in the group policy associated with a connection profile or username.

The following example defines the DHCP server at 172.33.44.19 for the connection profile named firstgroup . The example also defines a DHCP network scope of 10.100.10.1 for the group policy called remotegroup . (The group policy called remotegroup is associated with the connection profile called firstgroup). If you do not define a network scope, the DHCP server assigns IP addresses in the order of the address pools configured. It goes through the pools until it identifies an unassigned address.

Before you begin

You can only use an IPv4 address to identify a DHCP server to assign client addresses. In addition, DHCP options are not forwarded to users, they receive an address assignment only.

Local user accounts can be configured to use a group policy, and some AnyConnect Client attributes can also be configured. These user accounts provide fallback if the other sources of IP address fail, so administrators will still have access.

To add or edit a user, choose Configuration > Remote Access VPN > AAA/Local Users > Local Users and click Add or Edit .

By default, the Inherit check box is checked for each setting on the Edit User Account screen, which means that the user account inherits the value of that setting from the default group policy, DfltGrpPolicy.

To override each setting, uncheck the Inherit check box, and enter a new value. The detailed steps that follow describe the IP address settings. See Configure VPN Policy Attributes for a Local User for full configuration details.

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How to Configure IP Helper address in Cisco Routers

Confused by ip helper on cisco routers learn how to configure it for simplified dhcp management in this easy guide.

How to Configure IP Helper address in Cisco Routers

Table of Contents

How to Configure IP Helper address in Cisco Routers, It is necessary for multiple networks to be able to talk to each other. With this feature, DHCP broadcasts can be sent across network borders, so devices in one subnet can get IP addresses and other configuration information from a DHCP server in a different submet. This setup is especially useful when there are a lot of VLANs or when centralized DHCP services are being used.

By setting up IP Helper address properly, network administrators make sure that all devices can connect and that resources are shared evenly across the network. This guide tells you step-by-step how to set up an IP Helper address on a Cisco router so that network communication works smoothly and reliably. Setting up an IP Helper address is a useful skill for any network user, whether they are setting up a new network switch or making changes to an old one.

Now that you know this, you can improve network speed and make sure that devices on different subnets can easily talk to each other, which will make the network more reliable and efficient as a whole. Taking the time to set up IP Helper address properly can make a big difference in how well your network infrastructure works. Here are the simple steps how to Configure IP Helper address in Cisco Routers. If you want to know more information about this visit Cisco Official Website.

What is an IP Helper Address

An IP Helper Address is a setting on Cisco devices that is very important for network communication. It lets routers and Layer 3 switches send specific broadcast data quickly between different network segments or subnets. This setup works especially well when devices on different subnets need to talk to each other, like in networks with more than one VLAN.

How to Configure IP Helper address in Cisco Routers

A main job of an IP Helper Address is to make it easier to forward DHCP (Dynamic Host Configuration Protocol) requests as well as broadcast-based services like TFTP (Trivial File Transfer Protocol) or BOOTP (Bootstrap Protocol) requests. To make sure that these broadcast packets get to the right DHCP server or other services, even if they are on a different subnet, network managers use an IP Helper Address.

  • Type “ enable ” and enter your password if asked to get into privileged EXEC mode .
  • Type “ configure terminal ” to get into global setting mode .
  • Enter the interface type and number , where type is the interface type (like FastEthernet ) and number is the interface number (like 0/0 ). This will set up the interface that is linked to the broadcast domain .
  • Type “ ip helper-address address ” to set up the IP helper address . address is the IP address of the DHCP server that the router should send DHCP requests to.
  • Do steps 3 through 4 again for every port that needs an IP address .

Benefits of Configuring IP Helper Address

  • IPv4 to IPv6 Transition: Cisco devices can help IPv4 and IPv6 networks talk to each other through IP Helper Address. It lets IPv6 hosts on one network segment get IPv6 addresses and other setup data from an IPv4-only DHCPv6 server on a different network segment.
  • Compatible with Older Devices: If you have older devices that don’t support DHCP relay agents or only have limited DHCP capabilities, IP Helper Address can help you get around this problem by letting the router forward DHCP requests on your behalf. So, even old devices will be able to get IP numbers and configuration data from a DHCP server.
  • Redundancy and Load Balancing: IP Helper Address lets you set up multiple DHCP servers and distributes the load. By setting up more than one DHCP server address in the IP Helper setup, Cisco devices can spread DHCP requests across more than one server, which makes them more resilient to failure and easier to expand.
  • DHCP Options Support :You can use IP Helper Address to send DHCP options between DHCP clients and servers. These options include subnet masks, default ports, DNS server addresses, and more. This makes sure that DHCP clients get all the setup information they need from the DHCP server, no matter where on the network they are.
  • Optimization of Network Resources : IP Helper Address helps optimize network resources by centralizing DHCP services and removing the need for local DHCP servers on each network segment. This cuts down on the administrative work that comes with handling multiple DHCP server instances.

To sum up, setting up IP Helper addresses on Cisco routers is necessary for different parts of the network to be able to talk to each other and for services like DHCP and DNS to work properly. Network administrators can better handle network traffic and make it easier for people to join to different networks if they understand how IP Helper addresses work and follow the step-by-step configuration process outlined in this guide.

With the right setup of IP Helper addresses, Cisco routers can efficiently send packets between different networks. This supports the changeable assignment of IP addresses and makes the network work better overall. By getting good at this configuration skill, network workers can keep networks that are reliable, efficient, and scalable enough to meet the needs of today’s businesses.

Question and Answer

Setting up an IP Helper Address doesn’t make the network move much more slowly. Still, it’s important to make sure the network is well-planned and has enough bandwidth to handle the extra traffic that comes from broadcast packets being forwarded.

Of course! You can set up an IP Helper Address on a Layer 3 switch. This address handle IP routing jobs like a router. It makes it easier for gadgets to talk to each other over different networks.

Since IP Helper Address forwards broadcast traffic, you should manage the services and locations it sends to keep people from getting in without permission or abusing resources. Limiting sending helps keep the network safe.

Along with DHCP, IP Helper Address sends calls for TFTP and BOOTP services to servers in different subnets. This makes networks work better and makes it easier for people to talk to each other across networks.

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IMAGES

  1. Assign ip address to cisco switch / Assign ip address to vlan

    assign an ip address to a vlan cisco

  2. How to Configure VLAN on Cisco Switch

    assign an ip address to a vlan cisco

  3. Workaround for VLAN Management IP Address Assignment

    assign an ip address to a vlan cisco

  4. Как настроить vlan на cisco packet tracer

    assign an ip address to a vlan cisco

  5. How to assign an IP address to a vlan on a Cisco switch

    assign an ip address to a vlan cisco

  6. Configure VLAN Interface IPv4 Address on an Sx350 or SG350X Switch

    assign an ip address to a vlan cisco

VIDEO

  1. Inter VLAN Routing CISCO Configuration

  2. How to Implement VLAN with IP Address

  3. Assign ip address to vlan

  4. how to change IP Address 2 ISP in Mikrotik router

  5. learn basics: IP address, VLAN, subnetting

  6. Configure IP address to PC in GNS3 #gns3 #networkengineer #networkengineerstuff #ipaddresstoPCGNS3

COMMENTS

  1. Configure an IP address for that VLAN interface

    5 Configure an IP address for that VLAN interface tie Beginner 12-05-2012 10:31 AM - edited ‎03-07-2019 10:25 AM Hello everyone, I am hoping that someone can point in the right direction. I just got my geeky hands on a two 3750G switches and went, "Yuppie no more router on a stick for me, inter vlan routing here I come!!!"

  2. Configure IP Address Settings on a Switch using the CLI

    Step 1. Connect your computer directly to the switch using a serial cable. If you would prefer to SSH into your switch, click here to view an article on gaining CLI access to a switch. Step 2. Log in to the switch console. The default username and password is cisco/cisco.

  3. Assign ip address to a VLAN

    5 Assign ip address to a VLAN SunnyChanS.C1 Beginner 07-14-2015 10:24 AM I've been doing CLI for a long time now so I'm new to the GUI for the SG200 switch. I want to create two VLANs and assign both of them different ip addresses. How do i do it in a SG200 switch? I have this problem too Labels: Small Business Switches 0 Helpful Reply

  4. How to Create and Configure VLANs on a Cisco Switch with Example

    VLAN assignment on a switch is configured on a per-interface basis. That is, each switch port interface is assigned individually into a Layer 2 VLAN. If you have more than one switch connected and you want the same VLANs to belong across all switches, then a Trunk Port must be configured between the switches.

  5. Configure VLAN Interface IPv4 Address on an Sx350 or SG350X ...

    Configure VLAN Interface IPv4 Address Important: When the switch is in a stacking mode with a Standby switch present, it is recommended to configure the IP address as a static address to prevent disconnecting from the network during a Stacking Active switchover.

  6. PDF Understanding and Configuring VLANs

    Layer 2 switches create broadcast domains based on the configuration of the switch. Switches are multiport bridges that allow you to create multiple broadcast domains. Each broadcast domain is like a distinct virtual bridge within a switch. You can define one or many virtual bridges within a switch.

  7. Configuring VLANs

    See the Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x for complete information on configuring VLAN interfaces, and subinterfaces, as well as assigning IP addresses. This feature must be enabled before you can configure VLAN interfaces.

  8. How to assign an IP address to a vlan on a Cisco switch

    Introduction How to assign an IP address to a vlan on a Cisco switch Tech Pub 58.2K subscribers Subscribe Subscribed 69 Share 23K views 8 years ago Cisco routers and switches Author, teacher,...

  9. Configuring the Switch IP Address and Default Gateway

    • Setting the In-Band (sc0) Interface IP Address • Setting the Management Ethernet (me1) Interface IP Address • Configuring Default Gateways • Configuring the SLIP (sl0) Interface on the Console Port • Using DHCP or RARP to Obtain an IP Address Configuration • Renewing and Releasing a DHCP-Assigned IP Address

  10. Cisco Content Hub

    Tab. Trailing spaces. Note You use the ssid command authentication options to configure an authentication type for each SSID. See "Configuring Authentication Types," for instructions on configuring authentication types. Step 4. vlan vlan-id. (Optional) Assign the SSID to a VLAN on your network.

  11. Configure Port to VLAN Interface Settings on a Switch through ...

    The network address is 192.168.10.1 with subnet mask 255.255.255. or /24. VLAN20 - Virtual network for the Finance department. The network address is 192.168.20.1 with subnet mask 255.255.255. or /24. VLAN30 - Virtual network for the Operations department. The network address is 192.168.30.1 with subnet mask 255.255.255. or /24.

  12. Cisco Content Hub

    Beginning in privileged EXEC mode, follow these steps to configure IP address for the VLAN: Procedure Configuring VLAN Trunks A trunk is a point-to-point link between one or more Ethernet interfaces and another networking device such as a router or a switch.

  13. Solved: IP on VLAN or IP on Loopback in VLAN

    On a current Catalyst product Is it better to assign an IP address directly to a VLAN interface or to assign an IP address to a Loopback interface that is in a particular VLAN? What are the benefits or pitfalls of either method? I have this problem too Labels: LAN Switching catalyst interface ios ip_address switches vlan vlan_interface 0 Helpful

  14. Solved: how can i assign a PC into a vlan?

    LAN Switching 0 Helpful Reply All forum topics Previous Topic Next Topic 1 Accepted Solution smothuku Rising star 04-02-2008 11:12 PM Hi Phani , Ex : First create vlan on the switch.i.e Interface Vlan x ip address 10.10.10.1 255.255.255. no sh Connect PC to anyport on the switch .i.e If PC is terminated on f0/1 interface f0/1

  15. How to Configure VLAN on Cisco Switch

    Step 1 First, add a Router, Switch, and six PCs to the Packet Tracer workspace to create a network topology as shown in the image below. Step 2 After configuring the Cisco Router's interface and the TCP/IP settings of the computers, click Switch and click the CLI tab in the window that opens. To change to Privileged mode, execute enable. Step 3

  16. when to assign ip to interface/vlan?

    In this case, if hosts on those VLANs need to communicate with the ASA's interface (such as if the ASA was their default gateway) then you need to assign an IP address to each subinterface for each VLAN (e.g. 192.168.10.1, 192.168.20.1 and 192.168.30.1) and enable dot1q support for the interface. Here is an example (see attached png).

  17. Configure Subnet-based VLAN Groups on a Switch through the CLI

    1. Create the VLANs. To learn how to configure the VLAN settings on your switch through the web-based utility, click here. For CLI-based instructions, click here. 2. Configure interfaces to VLANs. For instructions on how to assign interfaces to VLANs through the web-based utility of your switch, click here. For CLI-based instructions, click here.

  18. Configure an IP address on a switch

    Here are the steps to configure an IP address under VLAN 1: enter the VLAN 1 configuration mode with the interface vlan 1 global configuration command. assign an IP address with the ip address IP_ADDRESS SUBNET_MASK interface subcommand. enable the VLAN 1 interface with the no shutdown interface subcommand.

  19. Assign ip address to cisco switch / Assign ip address to vlan

    configure ip address to cisco switchThis video covers how to assign ip address to vlan or how to assign ip address to cisco layer 2 switch using packet trace...

  20. Assigning the Switch IP Address and Default Gateway

    Note Information in this chapter about configuring IP addresses and DHCP is specific to IP Version 4 (IPv4). If you plan to enable IP Version 6 (IPv6) forwarding on your switch, see Chapter 38, "Configuring IPv6 Unicast Routing" for information specific to IPv6 address format and configuration. To enable IPv6, the stack or switch must be running the advanced IP services feature set.

  21. Solved: Assigning IP address range on VLANs

    1 Accepted Solution kcnajaf Rising star In response to startupsoldchris 02-25-2014 02:38 AM Hi Chris, This should be possible. . Looks like maximum number of DHCP client addresses varies depending on the license.Below links shows how to enable DHCP service on ASA.

  22. assign ip to switch vlans

    5 2 assign ip to switch vlans Arie Beginner 12-13-2016 08:27 PM - edited ‎03-08-2019 08:33 AM I have 2950 switch L2. I made a trunk port on it on F0/1 interface as its going towards router on which i deployed 3 sub interfaces and 3 vlans on it (0.11,0.99,0.192). My questions are:

  23. Solved: Multiple Ip address in same Vlan

    4006 0 2 Multiple Ip address in same Vlan Go to solution AhmedCisco Beginner 12-25-2018 02:34 AM - edited ‎03-08-2019 04:53 PM Hi Gents, Is it possible to have multiple IP's in same Vlan? Like i have a network 192.168.2./25. I have Sales and Admin dept. I would like to subnet 192.168.2. and 192.168.2.128.

  24. Configure the AP Group VLANs with Wireless LAN Controllers

    In the Interfaces > Edit window, enter the IP address, the subnet mask, and the default gateway for the dynamic interface. Assign it to a physical port on the WLC, and enter the IP address of the DHCP server. Then click Apply. For this example, these parameters are used for the Student-VLAN interface:

  25. Cisco Catalyst 9800 Series Wireless Controller Software Configuration

    If the client's static IP address isn't part of the VLAN's IP list, the client fails to get internet access, even if the client is authenticated and authorized. ... Ensure that you configure SVI with an IP address in the same subnet as that of the client's IP address. IRCM support: Guest AireOS as anchor and Cisco Catalyst 9800 controller as ...

  26. Why does a VLAN have an IP address?

    53 1 5. Add a comment. 2. Informally, yes, a VLAN can have an IP address. Technically this is called a VLAN interface, as you configure it from interface configuration mode and it will be listed in the config as interface VLAN 100 (example). These are virtual interfaces (not physical ports) and are named "VLAN #".

  27. ASDM Book 3: Cisco Secure Firewall ASA Series VPN ASDM Configuration

    Configure Local IPv6 Address Pools. The IP Pool area shows the configured address pools by name with a starting IP address range, the address prefix, and the number of addresses configurable in the pool. If no pools exist, the area is empty.

  28. How to Configure IP Helper address in Cisco Routers

    What is an IP Helper Address. An IP Helper Address is a setting on Cisco devices that is very important for network communication. It lets routers and Layer 3 switches send specific broadcast data quickly between different network segments or subnets.