Brocade FastIron GS and GS-STK Hardware Installation Guide - Manual (Page 67)

Brocade FastIron GS and GS-STK Hardware Installation Guide 57
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Configuring IP addresses
5
DRAFT: BROCADE CONFIDENTIAL
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 Base Layer 3 Switch and other devices. You can configure up to four
loopback interfaces on an FGS device.
You can add up to 24 IP addresses to each loopback interface.
NOTE
If you configure the Brocade device to use a loopback interface to communicate with a BGP4
neighbor, you also must configure a loopback interface on the neighbor and configure the neighbor
to use that loopback interface to communicate with the Brocade device. To add a loopback
interface, enter commands such as those shown in the following example:
FastIron(config-bgp-router)# exit
FastIron(config)# interface loopback 1
FastIron(config-lbif-1)# 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 interface
A virtual interface is a logical port associated with a Layer 3 Virtual LAN (VLAN) configured on a
device. You can configure routing parameters on the virtual interface to enable the 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 Brocade FGS device uses the lowest MAC address on the device (the MAC address of port 1 or
1/1) as the MAC address for all ports within all virtual interfaces you configure on the device.
To add a virtual interface to a VLAN and configure an IP address on the interface, enter commands
such as the following:
FastIron
(config)# vlan 2 name IP-Subnet_1.1.2.0/24
FastIron
(config-vlan-2)# untag e1 to 4
FastIron
(config-vlan-2)# router-interface ve1
FastIron
(config-vlan-2)# interface ve1
FastIron
(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_1.1.2.0/24” 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>