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    Monitoring Dampened BGP Routes

    Purpose

    Display information about dampened routes. Report whether the indirect next hop of a route is unreachable; if not, display the IGP cost to the indirect next hop.

    The show ip bgp dampened-paths and show bgp ipv6 dampened-paths commands display similar information.

    Action

    To display information about dampened routes:

    host1#show ip bgp dampened-paths
    Local router ID 192.168.1.218, local AS 100
      Route flap dampening is enabled
      Decay half-life is 10 minutes while reachable, 20 minutes while unreachable
      Cuttoff threshold is 2000, reuse threshold is 750
      Maximum hold-down time is 20 minutes
      60 paths have active route flap histories (4560 bytes used)
      11 paths are suppressed
                                                   Figure   Time until
    Prefix          Peer      Status               of Merit Reuse/Remove
    24.31.128.0/19   10.2.1.48 Suppressed/Reachable   2681    00:17:00
    24.93.128.0/19   10.2.1.48 Suppressed/Reachable   2681    00:17:00
    24.95.0.0/19     10.2.1.48 Suppressed/Reachable   2681    00:17:00
    128.192.0.0/16   10.2.1.48 Available              1997    00:15:08
    148.161.0.0/16   10.2.1.48 Available              1997    00:15:10
    164.81.0.0/16    10.2.1.48 Available              1997    00:15:11
    192.29.60.0/24   10.2.1.48 Available              1997    00:15:12
    192.58.228.0/24  10.2.1.48 Available              1997    00:15:15
    192.88.8.0/24    10.2.1.48 Available              1997    00:15:17
    192.107.253.0/24 10.2.1.48 Suppressed/Unreachable 4331    00:19:42
    192.195.44.0/24  10.2.1.48 Suppressed/Reachable   2923    00:19:15
    192.195.49.0/24  10.2.1.48 Suppressed/Reachable   2923    00:19:15
    192.195.50.0/24  10.2.1.48 Suppressed/Reachable   2923    00:19:15
    192.197.150.0/24 10.2.1.48 Available              1997    00:15:25
    192.222.89.0/24  10.2.1.48 Suppressed/Unreachable 2788    00:19:42
    204.17.195.0/24  10.2.1.48 Suppressed/Reachable   2923    00:17:20
    204.52.186.0/24  10.2.1.48 Available              1997    00:15:26
    204.68.178.0/24  10.2.1.48 Available              1000    00:19:38
    204.101.0.0/16   10.2.1.48 Available              1997    00:15:29
    204.128.227.0/24 10.2.1.48 Suppressed/Reachable   2923    00:17:16
    204.146.24.0/22  10.2.1.48 Available              1997    00:15:30
    204.146.24.0/24  10.2.1.48 Available              1997    00:15:30

    Meaning

    Table 1 lists the show ip bgp dampened-paths command output fields.

    Table 1: show ip bgp dampened-paths Output Fields

    Field Name

    Field Description

    Local router ID

    BGP router ID of the local router

    local AS

    Number of the local AS

    Route flap dampening

    Status of route flap dampening (enabled or disabled)

    Decay half-life

    Time (in minutes) after which a penalty is decreased. After the route has been assigned a penalty, the penalty is decreased by half after the half-life period (which is 15 minutes by default).

    Cutoff threshold

    Value of the penalty for a flapping route below which the route is unsuppressed

    Reuse threshold

    Time (in hours:minutes:seconds) after which the path will be made available

    Maximum hold-down time

    Interval, in seconds, after not receiving a keepalive message that the software declares a peer dead

    route flap history

    Status of route flap history for route paths

    Prefix

    Prefix for the IP address

    Peer

    IP address of BGP peer

    Status

    Status of route dampening of the route path

    Figure of Merit

    A measure of the route's stability. Higher values indicate more recent route flap activity or less stability.

    Time until Reuse/Remove

    Time until the route is either reused (if currently suppressed) or its history entry is removed (if currently available)

    Published: 2014-08-18