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PowerConnect B-Series FCX Configuration Guide 1057
53-1002266-01
Configuring route flap dampening
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PowerConnect(config)#route-map DAMPENING_MAP_ENABLE permit 1
PowerConnect(config-routemap DAMPENING_MAP_ENABLE)#exit
PowerConnect(config)#route-map DAMPENING_MAP_NEIGHBOR_A permit 1
PowerConnect(config-routemap DAMPENING_MAP_NEIGHBOR_A)#set dampening
PowerConnect(config-routemap DAMPENING_MAP_NEIGHBOR_A)#exit
PowerConnect(config)#router bgp
PowerConnect(config-bgp-router)#dampening route-map DAMPENING_MAP_ENABLE
PowerConnect(config-bgp-router)#neighbor 10.10.10.1 route-map in
DAMPENING_MAP_NEIGHBOR_A
In this example, the first command globally enables route flap dampening. This route map does not
contain any match or set statements. At the BGP configuration level, the dampening route-map
command refers to the DAMPENING_MAP_ENABLE route map created by the first command, thus
enabling dampening globally.
The third and fourth commands configure a second route map that explicitly enables dampening.
Notice that the route map does not contain a match statement. The route map implicitly applies to
all routes. Since the route map will be applied to a neighbor at the BGP configuration level, the
route map will apply to all routes associated with the neighbor.
Although the second route map enables dampening, the first route map is still required. The
second route map enables dampening for the neighbors to which the route map is applied.
However, unless dampening is already enabled globally by the first route map, the second route
map has no effect.
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.
PowerConnect#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.
PowerConnect#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.