Users Guide

The history paths that the show ip bgp command displays contain only the prex and the next-hop information.
The next-hop information shows the ip address of the neighbor. It does not show the actual next-hop details.
The following describes the show ip bgp damp command shown in the following example.
Field Description
Network Displays the network ID to which the route is dampened.
From Displays the IP address of the neighbor advertising the dampened route.
Reuse Displays the hour:minutes:seconds until the dampened route is available.
Path Lists all the ASs the dampened route passed through to reach the destination network.
Example
Dell# show ip bgp dampened-paths
BGP local RIB : Routes to be Added 0, Replaced 0, Withdrawn 0
BGP local router ID is 192.168.11.5
Status codes: s suppressed, S stale, d dampened, h history, * valid, > best
Path source: I - internal, a - aggregate, c - confed-external, r -
redistributed
n - network, D - denied, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network From Reuse Path
d 55.0.0.0/24 172.16.0.2 00:36:23 200
Dell#
BGP Extended Communities (RFC 4360)
BGP Extended Communities, as dened in RFC 4360, is an optional transitive BGP attribute.
BGP Extended Communities provides two major advantages over Standard Communities:
• The range is extended from 4-octet (AA:NN) to 8-octet (Type:Value) to provide enough number communities.
• Communities are structured using a new “Type” eld (1 or 2-octets), allowing you to provide granular control/lter routing information
based on the type of extended communities.
set extcommunity rt
To set Route Origin community attributes in Route Map, use this feature.
Syntax
set extcommunity rt {as4 ASN4:NN [non-trans] | ASN:NNNN [non-trans] | IPADDR:NN
[non-trans]} [additive]
To delete the Route Origin community, use the no set extcommunity command.
Parameters
as4 ASN4:NN Enter the keyword as4 then the 4-octet AS specic extended community number in the
format ASN4:NN (4-byte AS number:2-byte community value).
ASN:NNNN Enter the 2-octet AS specic extended community number in the format ASN:NNNN (2-
byte AS number:4-byte community value).
432 Border Gateway Protocol