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    Monitoring BGP Flap Statistics

    Purpose

    Display information about BGP flap statistics

    The show ip bgp flap-statistics and show bgp ipv6 flap-statistics commands display similar information.

    Action

    To display information about flap statistics:

    host1#show ip bgp flap-statistics
    Local BGP identifier 192.168.1.232, local AS 100
      Route flap dampening is enabled
      Default decay half-life is 15 minutes
      Default cutoff threshold is 2000, default reuse threshold is 750
      Default maximum hold-down time is 60 minutes
      307 paths have active route flap histories (27016 bytes used)
      5 paths are suppressed
                                                      Figure      Time until
    Prefix             Peer            Status         of Merit     Reuse/Remove
    24.201.0.0/18      192.168.1.158   Available       925         00:58:23
    24.201.64.0/18     192.168.1.158   Available       925         00:58:23
    52.128.224.0/19    192.168.1.158   Available       750         00:54:12
    61.8.0.0/19        192.168.1.158   Available       993         00:59:53
    61.8.30.0/24       192.168.1.158   Available       993         00:59:53
    62.229.73.0/24     192.168.1.158   Unreachable     925         00:58:23
    63.69.150.0/24     192.168.1.158   Available       750         00:54:12

    Meaning

    Table 1 lists the show ip bgp flap-statistics command output fields.

    Table 1: show ip bgp flap-statistics Output Fields

    Field Name

    Field Description

    Local BGP identifier

    BGP router ID of the local router

    local AS

    Local autonomous system number

    Route flap dampening

    Status of route flap dampening (enabled or disabled)

    Default 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).

    Default cutoff threshold

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

    Default reuse threshold

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

    Default 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 routing table entry

    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