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988 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
BGP4 parameters
30
NOTE
By default, the router ID is the IP address configured on the lowest numbered loopback interface. If
the Layer 3 Switch does not have a loopback interface, the default router ID is the lowest numbered
IP interface address configured on the device. For more information or to change the router ID, refer
to “Changing the router ID” on page 809. If you change the router ID, all current BGP4 sessions are
cleared.
PowerConnect> enable
PowerConnect#configure terminal
PowerConnect(config)#router bgp
BGP4: Please configure 'local-as' parameter in order to enable BGP4.
PowerConnect(config-bgp-router)#local-as 10
PowerConnect(config-bgp-router)#neighbor 209.157.23.99 remote-as 100
PowerConnect(config-bgp-router)#write memory
NOTE
When BGP4 is enabled on a Layer 3 Switch, you do not need to reset the system. The protocol is
activated as soon as you enable it. Moreover, the router begins a BGP4 session with a BGP4
neighbor as soon as you add the neighbor.
Note regarding disabling BGP4
If you disable BGP4, the Layer 3 Switch removes all the running configuration information for the
disabled protocol from the running-config. To restore the BGP4 configuration, you must reload the
software to load the configuration from the startup-config. Moreover, when you save the
configuration to the startup-config file after disabling the protocol, all the configuration information
for the disabled protocol is removed from the startup-config file.
The CLI displays a warning message such as the following.
PowerConnect(config-bgp-router)#no router bgp
router bgp mode now disabled. All bgp config data will be lost when writing to
flash!
If you are testing a BGP4 configuration and are likely to disable and re-enable the protocol, you
might want to make a backup copy of the startup-config file containing the protocol configuration
information. This way, if you remove the configuration information by saving the configuration after
disabling the protocol, you can restore the configuration by copying the backup copy of the
startup-config file onto the flash memory.
NOTE
To disable BGP4 without losing the BGP4 configuration information, remove the local AS (for
example, by entering the no local-as <num> command). In this case, BGP4 retains the other
configuration information but is not operational until you set the local AS again.
BGP4 parameters
You can modify or set the following BGP4 parameters:
• Optional – Define the router ID. (The same router ID also is used by OSPF.)
• Required – Specify the local AS number.
• Optional – Add a loopback interface for use with neighbors.