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Configuring IP
Changing the Router ID
In most configurations, a routing switch has multiple IP addresses, usually configured on different interfaces. As a
result, a routing switch’s identity to other devices varies depending on the interface to which the other device is
attached. Some routing protocols, including Open Shortest Path First (OSPF) and Border Gateway Protocol
version 4 (BGP4), identify a routing switch by just one of the IP addresses configured on the routing switch,
regardless of the interfaces that connect the routing 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 an HP routing switch is one of the following:
• If the routing switch has loopback interfaces, the default router ID is the IP address configured on the lowest
numbered loopback interface configured on the routing switch. For example, if you configure loopback
interfaces 1, 2, and 3 as follows, the default router ID is 9.9.9.9/24:
• 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: HP routing switches use the same router ID for both OSPF and BGP4. If the routing switch is already
configured for OSPF, you may want to use the router ID that is already in use on the routing switch 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:
HP9300(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 HP routing 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.
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