Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 376)

358 Brocade ICX 6650 Layer 3 Routing Configuration Guide
53-1002603-01
Route flap dampening configuration
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
10.1.0.0/16 have been suppressed. In this case, the route to 10.1.44.0/24 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 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.
Brocade(config-bgp-router)#aggregate-address 10.1.0.0 255.255.0.0 summary-only
Brocade(config-bgp-router)#show ip bgp route 10.1.0.0/16 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 10.1.0.0/16 0.0.0.0 101 32768 BAL
AS_PATH:
2 10.1.44.0/24 10.2.0.1 1 101 32768 BLS
AS_PATH:
Brocade#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 not advertised to any peers
Brocade(config)#ip prefix-list Unsuppress1 permit 10.1.44.0/24
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