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Configuring BGP
Configuring Advanced BGP Features
IPC-330
Cisco IOS IP Configuration Guide
To change the default values of various dampening factors, use the following command in address family
or router configuration mode:
Monitoring and Maintaining BGP Route Dampening
You can monitor the flaps of all the paths that are flapping. The statistics will be deleted once the route
is not suppressed and is stable for at least one half-life. To display flap statistics, use the following
commands in EXEC mode as needed:
To clear BGP flap statistics (thus making it less likely that the route will be dampened), use the following
commands in EXEC mode as needed:
Note The flap statistics for a route are also cleared when a BGP peer is reset. Although the reset withdraws
the route, there is no penalty applied in this instance, even if route flap dampening is enabled.
Command Purpose
Router(config)# bgp dampening half-life reuse
suppress max-suppress [route-map map-name]
Changes the default values of route dampening factors.
Command Purpose
Router# show ip bgp flap-statistics
Displays BGP flap statistics for all paths.
Router# show ip bgp flap-statistics regexp regexp
Displays BGP flap statistics for all paths that match the
regular expression.
Router# show ip bgp flap-statistics filter-list
access-list
Displays BGP flap statistics for all paths that pass the filter.
Router# show ip bgp flap-statistics ip-address mask
Displays BGP flap statistics for a single entry.
Router# show ip bgp flap-statistics ip-address mask
longer-prefix
Displays BGP flap statistics for more specific entries.
Command Purpose
Router# clear ip bgp flap-statistics
Clears BGP flap statistics for all routes.
Router# clear ip bgp flap-statistics regexp regexp
Clears BGP flap statistics for all paths that match the regular
expression.
Router# clear ip bgp flap-statistics filter-list
list
Clears BGP flap statistics for all paths that pass the filter.
Router# clear ip bgp flap-statistics ip-address mask
Clears BGP flap statistics for a single entry.
Router# clear ip bgp ip-address flap-statistics
Clears BGP flap statistics for all paths from a neighbor.