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Configuration Guide - IP Routing 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Configuration Guide - IP Routing
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Configuring BGP4+ Route Dampening

Configuring BGP4+ Route Dampening

Configuring BGP4+ route dampening suppresses instable BGP4+ routes.

Usage Scenario

BGP4+ route dampening is designed to suppress unstable routes and improve network stability. With BGP4+ route dampening, a BGP4+ device does not add any unstable routes to its BGP4+ routing table or advertise them to its BGP4+ peers.

A primary cause of route instability is route flapping. A route is considered to be flapping when it repeatedly appears and then disappears in the routing table. BGP4+ is applied to complex networks where routes change frequently. Frequent route flapping consumes lots of bandwidth and CPU resources and even seriously affects network operations. To prevent the impact of frequent route flapping, BGP4+ uses route dampening to suppress unstable routes.

With specified-requirement route dampening, you can use a route-policy to differentiate routes so that BGP4+ can apply route dampening parameters to different routes. You can also configure different route dampening parameters for different nodes of the same route-policy. When route flapping occurs, BGP4+ can use different route dampening parameters to suppress the routes that match the route-policy. For example, on a network, set a long dampening time for routes with a long mask, and set a short dampening time for routes with a short mask (8-bit mask for example).

Pre-configuration Tasks

Before configuring BGP4+ route dampening, configure basic BGP4+ functions.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run bgp as-number

    The BGP view is displayed.

  3. Run ipv6-family unicast

    The IPv6 unicast address family view is displayed.

  4. Run dampening [ half-life-reach reuse suppress ceiling | route-policy route-policy-name ] * [ update-standard ]

    BGP4+ route dampening parameters are set.

    NOTE:

    The dampening command is valid only for EBGP routes.

    The value of suppress must be greater than that of reuse and smaller than that of ceiling.

    The dampening command can apply different route dampening parameters to different routes the route-policy specified in the command.

  5. Run commit

    The configuration is committed.

Checking the Configuration

After the configuration is complete, check whether the configuration has taken effect.

  • Run the display bgp ipv6 routing-table dampened command to check dampened BGP4+ routes.

  • Run the display bgp ipv6 routing-table dampening parameter command to check configured BGP4+ route dampening parameters.

  • Run the display bgp ipv6 routing-table flap-info [ regular-expression as-regular-expression | as-path-filter { as-path-filter-number | as-path-filter-name } | network-address [ { mask | mask-length } [ longer-match ] ] ] command to check route flapping statistics.

# Run the display bgp ipv6 routing-table dampening parameter command to view the configured values of BGP4+ route dampening parameters including Maximum Suppress Time, Ceiling Value, and Reuse Value.

<HUAWEI> display bgp ipv6 routing-table dampening parameter
 Maximum Suppress Time(in second) : 3973
 Ceiling Value                    : 16000
 Reuse Value                      : 750
 HalfLife Time(in  second)        : 900
 Suppress-Limit                   : 2000
 Route-policy                     : dampen-policy
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Updated: 2019-01-14

Document ID: EDOC1100058916

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