■NN—Number that identifies the community within the autonomous
system
â– Example
host1#show ip bgp community-list 1 fields peer communities
Local router ID 192.168.1.153, local AS 100
72077 paths, 72077 distinct prefixes (5189544 bytes used)
72077 paths selected for route table installation
21627 path attribute entries (2957324 bytes used)
Prefix Peer Communities
3.0.0.0/8 10.5.0.48 777:777 888:888
4.0.0.0/8 10.5.0.48 777:777 888:888
4.17.106.0/24 10.5.0.48 777:777 888:888
4.17.115.0/24 10.5.0.48 777:777 888:888
6.0.0.0/8 10.5.0.48 777:777 888:888
9.2.0.0/16 10.5.0.48 777:777 888:888
9.20.0.0/17 10.5.0.48 777:777 888:888
12.0.0.0/8 10.5.0.48 777:777 888:888
â– See show ip bgp community-list.
â– Seeshow bgp ipv6 community-list.
show ip bgp dampened-paths
show bgp ipv6 dampened-paths
â– Use to display information about dampened routes.
â– Reports whether the indirect next hop of a route is unreachable; if not, displays
the IGP cost to the indirect next hop.
â– If you filter the display with field options, the usual introductory information
about BGP attributes is displayed only if you issue the intro fields option. See
show ip bgp for descriptions of the fields displayed by this keyword.
â– Field descriptions
■Local router ID—IP address 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
Monitoring BGP â– 171
Chapter 1: Configuring BGP Routing
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