Chapter 29
| IP Routing Commands
Border Gateway Protocol (BGPv4)
– 981 –
parameters – Route dampening parameters.
Command Mode
Privileged Exec
Example
In the following example, “From” indicates the peer that advertised this path, while
“Reuse” is the time after which the path will be made available.
Console#show ip bgp dampening dampened-paths
BGP table version is 0, local router ID is 192.168.0.2
Status codes: s suppressed, d damped, h history, * valid, > best, i internal,
r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete
Network From Reuse Path
*d 100.1.3.0/24 10.1.1.64 00:27:40 100 ?
Total number of prefixes 1
Console#
In this example, “Duration” indicates the time since the first flap occurred.
Console#show ip bgp dampening flap-statistics
BGP table version is 0, local router ID is 192.168.0.2
Status codes: s suppressed, d damped, h history, * valid, > best, i internal,
r RIB-failure, S Stale, R Removed
Origin codes: i - IGP, e - EGP, ? - incomplete
Network From Flaps Duration Reuse Path
*d 100.1.3.0/24 10.1.1.64 3 00:06:05 00:27:00 100 ?
Total number of prefixes 1
Console#
This example shows the dampening parameters configured on this router.
Console#show ip bgp dampening parameters
Dampening 15 750 2000 60
Reachability half-life time :15 min
Reuse penalty :750
Suppress penalty :2000
Max suppress time :60 min
Console#
Table 188: show ip bgp dampening parameters- display description
Field Description
Reachability half-
life time
The time after which a penalty is reduced. The penalty value is reduced to half of
the previous value after the half-life time expires.
Reuse penalty The point to which the penalty for a flapping route must fall before a route is
unsuppressed.
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