# 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 31 lists the show ip bgp dampened-paths command output fields.

Table 31: 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)

#### Related Documentation

- show bgp ipv6 dampened-paths
- show ip bgp dampened-paths