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FastIron Configuration Guide 1419

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Route flap dampening configuration

If you want to override the summary-only parameter and allow a specific route to be advertised to a

neighbor, enter commands such as the following.

The ip prefix-list command configures an IP prefix list for network 209.1.44.0/24, which is the

route you want to unsuppress. The next two commands configure a route map that uses the prefix

list as input. The neighbor command enables the Layer 3 switch to advertise the routes specified in

the route map to neighbor 10.1.0.2. The clear command performs a soft reset of the session with

the neighbor so that the Layer 3 switch can advertise the unsuppressed route.

Syntax: [no] neighbor <ip-addr> | <peer-group-name> unsuppress-map <map-name>

The following command verifies that the route has been unsuppressed.

Displaying and clearing route flap dampening statistics

The software provides many options for displaying and clearing route flap statistics. To display the

statistics, use either of the following methods.

Displaying route flap dampening statistics

To display route dampening statistics or all the dampened routes, enter the show ip bgp

flap-statistics command at any level of the CLI.

Brocade#show ip bgp route 209.1.44.0/24

Number of BGP Routes matching display condition : 1

Status A:AGGREGATE B:BEST b:NOT-INSTALLED-BEST C:CONFED_EBGP D:DAMPED

E:EBGP H:HISTORY I:IBGP L:LOCAL M:MULTIPATH S:SUPPRESSED F:FILTERED

Prefix Next Hop Metric LocPrf Weight Status

1 209.1.44.0/24 10.2.0.1 1 101 32768 BLS

AS_PATH:

Route is not advertised to any peers

Brocade(config)#ip prefix-list Unsuppress1 permit 209.1.44.0/24

Brocade(config)#route-map RouteMap1 permit 1

Brocade(config-routemap RouteMap1)#match ip prefix-list Unsuppress1

Brocade(config-routemap RouteMap1)#exit

Brocade(config)#router bgp

Brocade(config-bgp-router)#neighbor 10.1.0.2 unsuppress-map RouteMap1

Brocade(config-bgp-router)#clear ip bgp neighbor 10.1.0.2 soft-out