Dell BigIron RX Series, Руководство по настройке

Страница: 890 / 1458

814 BigIron RX Series Configuration Guide
53-1002253-01
Filtering
26
BigIron RX(config-routemap DAMPENING_MAP_NEIGHBOR_A)# exit
BigIron RX(config)# router bgp
BigIron RX(config-bgp)# dampening route-map DAMPENING_MAP_ENABLE
BigIron RX(config-bgp)# 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 BigIron RX
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.
BigIron RX# 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’s mask.
To un-suppress a specific route, enter a command such as the following.
BigIron RX# 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.
Displaying and clearing route flap dampening statistics
The software provides many options for displaying and clearing route flap statistics.
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.