Brocade Communications Systems FastIron SX 1600, Configuration Manual, Page: 427 / 593

The regular-expression regular-expression parameter is a regular expression. Regular expressions are the same ones supported for
BGP4 AS-path filters.
The address mask parameters specify a particular route. If you also use the optional longer-prefixes parameter, all statistics for routes
that match the specified route or have a longer prefix than the specified route are displayed. For example, if you specify 10.157.0.0
longer , all routes with the prefix 10.157. or longer (such as 10.157.22.) are displayed.
The neighbor ip-addr parameter displays route flap dampening statistics only for routes learned from the specified neighbor. You also
can display route flap statistics for routes learned from a neighbor by entering the following command: show ip bgp neighbor flap-
statistics .
The as-path-filter num parameter specifies one or more filters. Only the routes that have been dampened and that match the specified
filter or filters are displayed.
TABLE 91 show ip bgp flap-statistics output descriptions
This field Displays
Total number of flapping routes The total number of routes in the BGP4 route table that have changed
state and have been marked as flapping routes.
Status code Indicates the dampening status of the route, which can be one of the
following:
• > - This is the best route among those in the BGP4 route table
to the route destination.
• d - This route is currently dampened, and unusable.
• h - The route has a history of flapping and is unreachable now.
• * - The route has a history of flapping but is currently usable.
Network The destination network of the route.
From The neighbor that sent the route to the device.
Flaps The number of flaps the route has experienced.
Since The amount of time since the first flap of this route.
Reuse The amount of time remaining until this route will be un-suppressed and
can be used again.
Path Shows the AS-path information for the route.
You also can display all dampened routes by entering the show ip bgp dampened-paths command.
Clearing route flap dampening statistics
Clearing the dampening statistics for a route does not change the dampening status of the route. To clear all the route dampening
statistics, enter the following command at any level of the CLI.
device# clear ip bgp flap-statistics
Syntax: clear ip bgp flap-statistics [ regular-expression regular-expression | address mask | neighbor ip-addr ]
The parameters are the same as those for the show ip bgp flap-statistics command (except the longer-prefixes option is not
supported).
NOTE
The clear ip bgp dampening command not only clears statistics but also un-suppresses the routes.
Configuring route flap dampening
FastIron Ethernet Switch Layer 3 Routing
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