Brocade TurboIron 24X Series Configuration Guide - Manual (Page 761)

Brocade TurboIron 24X Series Configuration Guide 727
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Configuring route flap dampening
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 10.1.44.0/24, 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 following command at
any level of the CLI.
Syntax: show ip bgp flap-statistics [regular-expression <regular-expression> | <address> <mask>
[longer-prefixes] | neighbor <ip-addr>]
TurboIron(config)#ip prefix-list Unsuppress1 permit 10.1.44.0/24
TurboIron(config)#route-map RouteMap1 permit 1
TurboIron(config-routemap RouteMap1)#match prefix-list Unsuppress1
TurboIron(config-routemap RouteMap1)#exit
TurboIron(config)#router bgp
TurboIron(config-bgp-router)#neighbor 10.1.0.2 unsuppress-map RouteMap1
TurboIron(config-bgp-router)#clear ip bgp neighbor 10.1.0.2 soft-out
TurboIron#show ip bgp route 10.1.44.0/24
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 10.1.44.0/24 10.2.0.1 1 101 32768 BLS
AS_PATH:
Route is advertised to 1 peers:
10.1.0.2(4)
TurboIron#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> 10.192.50.206/23 10.166.90.213 1 0 :0 :13 0 :0 :0 65001 4355 1 701
h> 10.203.255.192/20 10.166.90.213 1 0 :0 :13 0 :0 :0 65001 4355 1 7018
h> 10.203.252.165/24 10.166.90.213 1 0 :0 :13 0 :0 :0 65001 4355 1 7018
h> 10.192.50.208/23 10.166.90.213 1 0 :0 :13 0 :0 :0 65001 4355 1 701
h> 10.133.33.0/16 10.166.90.213 1 0 :0 :13 0 :0 :0 65001 4355 1 701
*> 10.204.17.220/24 10.166.90.213 1 0 :1 :4 0 :0 :0 65001 4355 701 62