Netgear XCM8806 Chassis User Manual - Page 715
Configuring Route Flap Dampening, Viewing the Route Flap Dampening Configuration
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NETGEAR 8800 User Manual The penalty placed on network 172.25.0.0 is decayed until the reuse limit is reached, when the route is again advertised. At half of the reuse limit, the dampening information for the route to network 172.25.0.0 is removed. The penalty is decayed by reducing the penalty value by one-half at the end of a configurable time period, called the half-life. Routes that flap many times may reach a maximum penalty level, or ceiling, after which no additional penalty is added. The ceiling value is not directly configurable, but the configuration parameter used in practice is the maximum route suppression time. No matter how often a route has flapped, after it stops flapping, it will again be advertised after the maximum route suppression time. Configuring Route Flap Dampening Using a routing policy, you enable BGP route flap dampening per BGP peer session, for a BGP peer group, or for a set of routes. To enable route flap dampening over BGP peer sessions, use the following command: configure bgp neighbor [all | ] {address-family [ipv4-unicast | ipv4-multicast]} dampening {{half-life {reuse-limit suppress-limit max-suppress } | policy-filter [ | none]} To enable route flap dampening for a BGP peer group, use the following command: configure bgp peer-group {address-family [ipv4-unicast | ipv4-multicast]} dampening {{half-life {reuse-limit supress-limit max-suppress }} | policy-filter [ | none]} You can supply the dampening parameters directly through the command line interface (CLI) command, or use the command to associate a policy that contains the desired parameters. Disabling Route Flap Dampening To disable route flap dampening for a BGP neighbor (disabling the dampening also deletes all the configured dampening parameters), use the following command: configure bgp neighbor [ | all] {address-family [ipv4-unicast | ipv4-multicast]} no-dampening To disable route flap dampening for a BGP peer group, use the following command: configure bgp peer-group {address-family [ipv4-unicast | ipv4-multicast]} no-dampening Viewing the Route Flap Dampening Configuration To view the configured values of the route flap dampening parameters for a BGP neighbor, use the following command: show bgp [neighbor {detail} | {neighbor} ] To view the configured values of the route flap dampening parameters for a BGP peer group, use the following command: Chapter 26. BGP | 715
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