Dell PowerConnect B-FCXs, Руководство по настройке

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1004 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Optional configuration tasks
30
NOTE
The software also contains an option to end the session with a BGP4 neighbor and thus clear the
routes learned from the neighbor. Unlike this clear option, the option for shutting down the neighbor
can be saved in the startup-config file and thus can prevent the Layer 3 Switch 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 Layer 3 Switch,
check the Layer 3 Switch running-config and startup-config files 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.
PowerConnect(config)#router bgp
PowerConnect(config-bgp-router)#neighbor 209.157.22.26 shutdown
PowerConnect(config-bgp-router)#write memory
Syntax: [no] neighbor <ip-addr> shutdown
The <ip-addr> parameter specifies the IP address of the neighbor.
Optional 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 993.
To change the Keep Alive Time to 30 and Hold Time to 90, enter the following command.
PowerConnect(config-bgp-router)#timers keep-alive 30 hold-time 90
Syntax: timers keep-alive <num> hold-time <num>