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1058 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Configuring route flap dampening
30
Here is an example.
The aggregate-address command configures an aggregate address. The summary-only parameter
prevents the Layer 3 Switch from advertising more specific routes contained within the aggregate
route. The show ip bgp route command shows that the more specific routes aggregated into
209.1.0.0/16 have been suppressed. In this case, the route to 209.1.44.0/24 has been
suppressed. The following command indicates that the route is not being advertised to the Layer 3
Switch BGP4 neighbors.
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.
PowerConnect(config-bgp-router)#aggregate-address 209.1.0.0 255.255.0.0
summary-only
PowerConnect(config-bgp-router)#show ip bgp route 209.1.0.0/16 longer
Number of BGP Routes matching display condition : 2
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
1 209.1.0.0/16 0.0.0.0 101 32768 BAL
AS_PATH:
2 209.1.44.0/24 10.2.0.1 1 101 32768 BLS
AS_PATH:
PowerConnect#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
PowerConnect(config)#ip prefix-list Unsuppress1 permit 209.1.44.0/24
PowerConnect(config)#route-map RouteMap1 permit 1
PowerConnect(config-routemap RouteMap1)#match prefix-list Unsuppress1
PowerConnect(config-routemap RouteMap1)#exit
PowerConnect(config)#router bgp
PowerConnect(config-bgp-router)#neighbor 10.1.0.2 unsuppress-map RouteMap1
PowerConnect(config-bgp-router)#clear ip bgp neighbor 10.1.0.2 soft-out