13.6.8 Verifying Route Flap Dampening

<Structure of this section>

(1) List of operation commands

The following table describes the operation commands for the route flap dampening facility.

Table 13-32: List of operation commands
Command name	Description
show ip route	Displays routing information stored in the routing table.
show ip bgp	Shows information related to the BGP4 protocol.
clear ip bgp	Removes the suppressed status of a suppressed route and clears route flap statistics.

(2) Verifying Route Flap Dampening

To display routes suppressed by route flap dampening, use the show ip bgp operation command with the dampened-routes parameter (only for the global network) specified.

Figure 13-47: Result of executing show ip bgp command (specifying dampened-routes parameter)
>show ip bgp neighbors 172.16.2.2 dampened-routes Date 20XX/01/17 11:53:14 UTC Status Codes: d dampened, h history, * valid, > active Network Peer Address ReUse d 172.20.211/24 172.16.2.2 00:07:11 ..1 d 172.21.211/24 172.16.2.2 00:19:10 ..1

Figure 13-47: Result of executing show ip bgp command (specifying dampened-routes parameter)

>show ip bgp neighbors 172.16.2.2 dampened-routes
Date 20XX/01/17 11:53:14 UTC
Status Codes: d dampened, h history, * valid, > active
   Network            Peer Address   ReUse
 d 172.20.211/24      172.16.2.2     00:07:11                         ..1
 d 172.21.211/24      172.16.2.2     00:19:10                         ..1

Use of this route has been suppressed by route flap dampening.

To display the flap state of the routes, use the show ip bgp operation command with the flap-statistics parameter (only for the global network) specified.

Figure 13-48: Result of executing show ip bgp command (specifying flap-statistics parameter)
>show ip bgp flap-statistics Date 20XX/01/17 11:56:28 UTC Status Codes: d dampened, h history, * valid, > active Network Peer Address Flaps Duration ReUse Penalty d 172.20.211/24 172.16.2.2 114 00:12:30 00:07:11 5.0 d 172.21.212/24 172.16.2.2 108 00:12:30 00:19:10 4.0 h 172.27.119/24 192.168.2.2 2 00:11:20 1.7 h 172.27.191/24 192.168.2.2 2 00:11:20 1.7 > 172.30.189/24 192.168.79.188 1 00:05:10 0.6 > 172.30.192/24 192.168.79.188 3 00:05:10 0.6 >

Figure 13-48: Result of executing show ip bgp command (specifying flap-statistics parameter)

>show ip bgp flap-statistics
Date 20XX/01/17 11:56:28 UTC
Status Codes: d dampened, h history, * valid, > active
   Network            Peer Address    Flaps      Duration ReUse    Penalty
 d 172.20.211/24      172.16.2.2      114        00:12:30 00:07:11 5.0
 d 172.21.212/24      172.16.2.2      108        00:12:30 00:19:10 4.0
 h 172.27.119/24      192.168.2.2     2          00:11:20          1.7
 h 172.27.191/24      192.168.2.2     2          00:11:20          1.7
*> 172.30.189/24      192.168.79.188  1          00:05:10          0.6
*> 172.30.192/24      192.168.79.188  3          00:05:10          0.6
>