Advanced Configuration and Management Guide

Using a Route Map To Configure Route Flap Dampening for a Specific Neighbor

You can use a route map to configure route flap dampening for a specific neighbor by performing the following tasks:

•Configure an empty route map with no match or set statements. This route map does not specify particular routes for dampening but does allow you to enable dampening globally when you refer to this route map from within the BGP configuration level.

•Configure another route map that explicitly enables dampening. Use a set statement within the route map to enable dampening. When you associate this route map with a specific neighbor, the route map enables dampening for all routes associated with the neighbor. You also can use match statements within the route map to selectively perform dampening on some routes from the neighbor.

NOTE: You still need to configure the first route map to enable dampening globally. The second route map does not enable dampening by itself; it just applies dampening to a neighbor.

•Apply the route map to the neighbor.

USING THE CLI

To enable route flap dampening for a specific BGP4 neighbor, enter commands such as the following:

HP9300(config)# route-map DAMPENING_MAP_ENABLE permit 1 HP9300(config-routemap DAMPENING_MAP_ENABLE)# exit HP9300(config)# route-map DAMPENING_MAP_NEIGHBOR_A permit 1 HP9300(config-routemap DAMPENING_MAP_NEIGHBOR_A)# set dampening HP9300(config-routemap DAMPENING_MAP_NEIGHBOR_A)# exit HP9300(config)# router bgp

HP9300(config-bgp-router)# dampening route-map DAMPENING_MAP_ENABLE HP9300(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-mapcommand 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-mapcommand 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.

USING THE WEB MANAGEMENT INTERFACE

1.Log on to the device using a valid user name and password for read-write access. The System configuration panel is displayed.

2.Click on the plus sign next to Configure in the tree view to expand the list of configuration options.

3.Click on the plus sign next to BGP in the tree view to expand the list of BGP option links.

4.In the tree view, under BGP in the Configure section, click on the Route Map Filter link to display the BGP Route Map Filter panel.

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