Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide User Manual

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addresses configured on the Layer 3 switch, regardless of the interfaces that connect the Layer 3
switches. This IP address is the router ID.

NOTE
Routing Information Protocol (RIP) does not use the router ID.

NOTE
If you change the router ID, all current BGP4 sessions are cleared.

By default, the router ID on a BrocadeLayer 3 switch is one of the following:

• If the router has loopback interfaces, the default router ID is the IP address configured on the lowest

numbered loopback interface configured on the Layer 3 switch. For example, if you configure
loopback interfaces 1, 2, and 3 as follows, the default router ID is 10.9.9.9/24:

‐

Loopback interface 1, 10.9.9.9/24

‐

Loopback interface 2, 10.4.4.4/24

‐

Loopback interface 3, 10.1.1.1/24

• If the device does not have any loopback interfaces, the default router ID is the lowest numbered IP

interface configured on the device.

If you prefer, you can explicitly set the router ID to any valid IP address. The IP address cannot be in
use on another device in the network.

NOTE
Brocade Layer 3 switches use the same router ID for both OSPF and BGP4. If the router is already
configured for OSPF, you may want to use the router ID that is already in use on the router rather than
set a new one. To display the router ID, enter the show ip command at any CLI level.

To change the router ID, enter a command such as the following.

device(config)# ip router-id 10.157.22.26

Syntax: ip router-id ip-addr

The ip-addr parameter can be any valid, unique IP address.

NOTE
You can specify an IP address used for an interface on the BrocadeLayer 3 switch, but do not specify
an IP address in use by another device.

Specifying a single source interface for specified packet types

NOTE
This feature is supported on Brocade FCX Series switches, FastIron X Series Layer 3 switches, ICX
6610,ICX 6430, and ICX 6450 switches.

When the Layer 3 switch originates a packet of one of the following types, the source address of the
packet is the lowest-numbered IP address on the interface that sends the packet:

• Telnet
• TACACS/TACACS+

Specifying a single source interface for specified packet types

FastIron Ethernet Switch Layer 3 Routing Configuration Guide

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