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Border Gateway Protocol IPv4 (BGPv4) | 261
To set dampening parameters via a route map, use the following command in CONFIGURATION
ROUTE-MAP mode:
To view a count of dampened routes, history routes and penalized routes when route dampening is enabled,
look at the seventh line of the
show ip bgp summary command output (Figure 10-32).
Figure 10-32. Command example: show ip bgp summary
To view which routes are dampened (non-active), use the show ip bgp dampened-routes command in
EXEC Privilege mode.
Command Syntax Command Mode Purpose
set dampening half-life reuse
suppress max-suppress-time
CONFIG-ROUTE-MAP Enter the following optional parameters to
configure route dampening parameters:
•
half-life range: 1 to 45. Number of minutes after
which the Penalty is decreased. After the router
assigns a Penalty of 1024 to a route, the
Penalty is decreased by half after the half-life
period expires.
(Default: 15 minutes)
• reuse range: 1 to 20000. This number is
compared to the flapping route’s Penalty value.
If the Penalty value is less than the reuse value,
the flapping route is once again advertised (or
no longer suppressed). (Default: 750)
• suppress range: 1 to 20000. This number is
compared to the flapping route’s Penalty value.
If the Penalty value is greater than the suppress
value, the flapping route is no longer
advertised (that is, it is suppressed). (Default:
2000.)
• max-suppress-time range: 1 to 255. The
maximum number of minutes a route can be
suppressed. The default is four times the
half-life value. (Default: 60 minutes.)
FTOS>show ip bgp summary
BGP router identifier 10.114.8.131, local AS number 65515
BGP table version is 855562, main routing table version 780266
122836 network entrie(s) and 221664 paths using 29697640 bytes of memory
34298 BGP path attribute entrie(s) using 1920688 bytes of memory
29577 BGP AS-PATH entrie(s) using 1384403 bytes of memory
184 BGP community entrie(s) using 7616 bytes of memory
Dampening enabled. 0 history paths, 0 dampened paths, 0 penalized paths
Neighbor AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.114.8.34 18508 82883 79977 780266 0 2 00:38:51 118904
10.114.8.33 18508 117265 25069 780266 0 20 00:38:50 102759
FTOS>
Dampening
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