The software also contains an option to end the session with a BGP4 neighbor and clear the routes learned from the neighbor. Unlike
this clear option, the option for shutting down the neighbor can be saved in the startup configuration file and can prevent the device from
establishing a BGP4 session with the neighbor even after reloading the software.
NOTE
If you notice that a particular BGP4 neighbor never establishes a session with the device, check the running configuration and
startup configuration files for that device to see whether the configuration contains a command that is shutting down the
neighbor. The neighbor may have been shut down previously by an administrator.
To shut down a BGP4 neighbor, enter commands such as the following.
device(config)# router bgp
device(config-bgp-router)# neighbor 10.157.22.26 shutdown
device(config-bgp-router)# write memory
Syntax:
[no] neighbor
ip-addr
shutdown
[
generate-rib-out
]
The
ip-addr
parameter specifies the IP address of the neighbor.
Optional BGP4 configuration tasks
The following sections describe how to perform optional BGP4 configuration tasks.
Changing the Keep Alive Time and Hold Time
The Keep Alive Time specifies how frequently the device will send KEEPALIVE messages to its BGP4 neighbors. The Hold Time
specifies how long the device will wait for a KEEPALIVE or UPDATE message from a neighbor before concluding that the neighbor is
dead. When the device concludes that a BGP4 neighbor is dead, the device ends the BGP4 session and closes the TCP connection to
the neighbor.
The default Keep Alive time is 60 seconds. The default Hold Time is 180 seconds.
NOTE
Generally, you should set the Hold Time to three times the value of the Keep Alive Time.
NOTE
You can override the global Keep Alive Time and Hold Time on individual neighbors.
To change the Keep Alive Time to 30 and Hold Time to 90, enter the following command.
device(config-bgp-router)# timers keep-alive 30 hold-time 90
Syntax:
[no] timers keep-alive
num
hold-time
num
For each keyword,
num
indicates the number of seconds. The Keep Alive Time can be 0 - 65535. The Hold Time can be 0 or 3 -
65535 (1 and 2 are not allowed). If you set the Hold Time to 0, the device waits indefinitely for messages from a neighbor without
concluding that the neighbor is dead.
Changing the BGP4 next-hop update timer
By default, the device updates the BGP4 next-hop tables and affected BGP4 routes five seconds after IGP route changes. You can
change the update timer to a value from 1 through 30 seconds.
Optional BGP4 configuration tasks
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