Brocade Communications Systems FCX Series Hardware Installation Manual page 66

Checking Network Devices and Testing Connectivity
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 Brocade switch 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 theBrocade switch.
To add a loopback interface, enter commands such as those shown in the following example:
device(config)# exit
device(config)# int loopback 1
device(config)# ip address 10.0.0.1/24
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.
device(config)# vlan 2 name IP-Subnet_10.1.2.1/24
device(config)# untag 1/1/1 to 1/1/4
device(config)# router-interface ve1
device(config)# interface ve1
device(config)# ip address 10.1.2.1/24
The first two commands in this example create a Layer 3 protocol-based VLAN name "IP-
Subnet_10.1.2.1/24 " and add a range of untagged ports to the VLAN. The router-interface command
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
64 Brocade FCX Series Hardware Installation Guide
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