Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 462)

to neighbor 10.10.10.1. Since the second route map does not contain match clauses for specific
routes, the route map enables dampening for all routes received from the neighbor.
Removing route dampening from a route
You can un-suppress routes by removing route flap dampening from the routes. The device allows you
to un-suppress all routes at once or un-suppress individual routes.
To un-suppress all the suppressed routes, enter the following command at the Privileged EXEC level
of the CLI.
device# clear ip bgp dampening
Syntax: clear ip bgp dampening [ ip-addr ip-mask ]
The ip-addr parameter specifies a particular network.
The ip-mask parameter specifies the network mask.
To un-suppress a specific route, enter a command such as the following.
device# clear ip bgp dampening 10.157.22.0 255.255.255.0
This command un-suppresses only the routes for network 10.157.22.0/24.
Displaying and clearing route flap dampening statistics
The software provides many options for displaying and clearing route flap statistics.
Displaying route flap dampening statistics
To display route dampening statistics or all the dampened routes, enter the following command at any
CLI level.
device# show ip bgp flap-statistics
Total number of flapping routes: 414
Status Code >:best d:damped h:history *:valid
Network From Flaps Since Reuse Path
h> 10.50.206.0/23 10.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 701
h> 10.255.192.0/20 10.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 7018
h> 10.252.165.0/24 10.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 7018
h> 10.50.208.0/23 10.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 701
h> 10.33.0.0/16 10.90.213.77 1 0 :0 :13 0 :0 :0 65001 4355 1 701
*> 10.17.220.0/24 10.90.213.77 1 0 :1 :4 0 :0 :0 65001 4355 701 62
Syntax: show ip bgp flap-statistics [ regular-expression regular-expression | address mask [
longer-prefixes ] | neighbor ip-addr ] as-path-filter num
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 neighborip-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 .
Removing route dampening from a route
462 FastIron Ethernet Switch Layer 3 Routing Configuration Guide
53-1003087-04