Configuration Guide User guide

1418 FastIron Configuration Guide
53-1002494-02
Route flap dampening configuration
The last two commands apply the route maps. The dampening route-map command applies the
first route map, which enables dampening globally. The neighbor command applies the second
route map to neighbor 10.10.10.1. Since the second route map does not contain match statements
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 Layer 3 switch
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.
Brocade#clear ip bgp damping
Syntax: clear ip bgp damping [<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.
Brocade#clear ip bgp damping 209.157.22.0 255.255.255.0
This command un-suppresses only the routes for network 209.157.22.0/24.
Removing route dampening from a neighbor routes
suppressed due to aggregation
You can selectively unsuppress more-specific routes that have been suppressed due to
aggregation, and allow the routes to be advertised to a specific neighbor or peer group.
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.
Brocade(config-bgp-router)#aggregate-address 209.1.0.0 255.255.0.0 summary-only
Brocade(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: