Brocade Communications Systems ICX 6650 Optional BGP4 configuration tasks

304 Brocade ICX 6650 Layer 3 Routing Configuration Guide
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Optional BGP4 configuration tasks
To shut down a BGP4 neighbor, enter commands such as the following.
Brocade(config)#router bgp
Brocade(config-bgp-router)#neighbor 192.168.22.26 shutdown
Brocade(config-bgp-router)#write memory
Syntax: [no] neighbor ip-addr shutdown
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 router will send KEEPALIVE messages to its BGP4
neighbors. The Hold Time specifies how long the router will wait for a KEEPALIVE or UPDATE
message from a neighbor before concluding that the neighbor is dead. When the router concludes
that a BGP4 neighbor is dead, the router 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. To change the
timers, use either of the following methods.
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. Refer to “Adding
BGP4 neighbors” on page 292.
To change the Keep Alive Time to 30 and Hold Time to 90, enter the following command.
Brocade(config-bgp-router)#timers keep-alive 30 hold-time 90
Syntax: timers keep-alive num hold-time num
For each keyword, num indicates the number of seconds. The Keep Alive Time can be 0 through
65535. The Hold Time can be 0 or 3 through 65535 (1 and 2 are not allowed). If you set the Hold
Time to 0, the router waits indefinitely for messages from a neighbor without concluding that the
neighbor is dead.
Changing the BGP4 next-hop update timer
By default, the Layer 3 switch updates its 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.
To change the BGP4 update timer value, enter the update-time command at the BGP configuration
level of the CLI.
Brocade(config-bgp-router)#update-time 15