Brocade Communications Systems 53-1002599-01 manual

Configuring IP addresses 3

Assigning an IP address to a loopback interface

Loopback interfaces are always up, regardless of the states of physical interfaces. They can add stability to the network because they are not subject to route flap problems that can occur due to unstable links between a Layer 3 Switch and other devices. You can configure up to four loopback interfaces on a Layer 3 switch.

You can add up to 24 IP addresses to each loopback interface.

NOTE

If you configure the device to use a loopback interface to communicate with a BGP4 neighbor, you must also configure a loopback interface on the neighbor and configure the neighbor to use that loopback interface to communicate with the Brocade switch.

To add a loopback interface, enter commands such as those shown in the following example:

Brocade(config)# int loopback 1

Brocade(config-lbif-1)# ip address 192.168.0.0/24

Syntax: interface loopback num

The num parameter specifies the virtual interface number. You can specify from 1 to the maximum number of virtual interfaces supported on the device. To display the maximum number of virtual interfaces supported on the device, enter the show default values command. The maximum is listed in the System Parameters section, in the Current column of the virtual-interface row.

Assigning an IP address to a virtual routing interface

A virtual interface is a logical port associated with a Layer 3 Virtual LAN (VLAN) configured on a Layer 3 switch. You can configure routing parameters on the virtual interface to enable the Layer 3 switch to route protocol traffic from one Layer 3 VLAN to the other, without using an external router.

This section describes how to configure an IP address on a virtual interface.

NOTE

The switch uses the lowest MAC address on the device (the MAC address of port 1 or 1/1/1) as the MAC address for all ports within all virtual interfaces you configure on the device.

Enter commands similar to the following to add a virtual interface to a VLAN and configure an IP address on the interface.

Brocade(config)# vlan 2 name IP-Subnet_1.1.2.1/24

Brocade(config-vlan-2)# untag 1/1/1 to 1/1/4

Brocade(config-vlan-2)# router-interface ve1

Brocade(config-vlan-2)# interface ve1

Brocade(config-vif-1)# ip address 1.1.2.1/24

The first two commands in this example create a Layer 3 protocol-based VLAN name “IP-Subnet_1.1.2.1/24” and add a range of untagged ports to the VLAN. The router-interfacecommand creates virtual interface 1 as the routing interface for the VLAN. The last two commands change to the interface configuration level for the virtual interface and assign an IP address to the interface.

Syntax: router-interface ve num

Syntax: interface ve num

Brocade ICX 6650 Hardware Installation Guide	25
53-1002599-01