Foundry Networks Switch and Router Installation And Configuration Manual page 469

• Loopback interface 1, 9.9.9.9/24
• Loopback interface 2, 4.4.4.4/24
• Loopback interface 3, 1.1.1.1/24
• 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: Foundry 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 CLI command at any CLI level or select the IP->General links
from the Configure tree in the Web management interface.
USING THE CLI
To change the router ID, enter a command such as the following:
BigIron(config)# ip router-id 209.157.22.26
Syntax: ip router-id <ip-addr>
The <ip-addr> can be any valid, unique IP address.
NOTE: You can specify an IP address used for an interface on the Foundry Layer 3 Switch, but do not specify an
IP address in use by another device.
USING THE WEB MANAGEMENT INTERFACE
1. Log on to the device using a valid user name and password for read-write access. The System configuration
panel is displayed.
2. Click on the plus sign next to Configure in the tree view to expand the list of configuration options.
3. Click on the plus sign next to IP in the tree view to expand the list of IP option links.
4. Click on the General link to display the IP configuration panel.
5. Edit the value in the Router ID field. Specify a valid IP address that is not in use on another device in the
network.
6. Click the Apply button to save the change to the device's running-config file.
7. Select the Save link at the bottom of the dialog. Select Yes when prompted to save the configuration change
to the startup-config file on the device's flash memory.
Specifying a Single Source Interface for Telnet, TACACS/TACACS+, or RADIUS
Packets
When the Layer 3 Switch originates a Telnet, TACACS/TACACS+, or RADIUS packet, the source address of the
packet is the lowest-numbered IP address on the interface that sends the packet. You can configure the Layer 3
Switch to always the lowest-numbered IP address on a specific interface as the source addresses for these types
of packets. When you configure the Layer 3 Switch to use a single source interface for all Telnet, TACACS/
TACACS+, or RADIUS packets, the Layer 3 Switch uses the same IP address as the source for all packets of the
specified type, regardless of the port(s) that actually sends the packets.
Identifying a single source IP address for Telnet, TACACS/TACACS+, or RADIUS packets provides the following
benefits:
• If your Telnet, TACACS/TACACS+, or RADIUS server is configured to accept packets only from specific IP
addresses, you can use this feature to simplify configuration of the server by configuring the Foundry device
to always send the packets from the same link or source address.
December 2000
Configuring IP
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