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Advanced Configuration and Management Guide
Syntax: show ip bgp flap-statistics [regular-expression <regular-expression> | <address> <mask>
[longer-prefixes] | neighbor <ip-addr> | filter-list <num>...]
The regular-expression <regular-expression> parameter is a regular expression. The regular expressions are
the same ones supported for BGP4 AS-path filters. See “Using Regular Expressions” on page 10-49.
The <address> <mask> parameter specifies a particular route. If you also use the optional longer-prefixes
parameter, then 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 209.157.0.0 longer, then all routes with the prefix 209.157. or
that have a longer prefix (such as 209.157.22.) 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 <ip-addr> flap-statistics.
The filter-list <num> parameter specifies one or more filters. Only the routes that have been dampened and that
match the specified filter(s) are displayed.
This display shows the following information.
Table 10.12: Route Flap Dampening Statistics
This Field... Displays...
Total number of flapping routes The total number of routes in the routing switch’s BGP4 route table
that have changed state and thus 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’s destination.
• d – This route is currently dampened, and thus 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 routing switch.
Flaps The number of flaps (state changes) 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 thus be usable again.
Path Shows the AS-path information for the route.
You also can display all the dampened routes by entering the following command:
show ip bgp dampened-paths.
USING THE WEB MANAGEMENT INTERFACE
You cannot display dampening statistics using the Web management interface.
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