Reference Guide

Border Gateway Protocol IPv4 (BGPv4) | 421
BGP Extended Communities (RFC 4360)
BGP Extended Communities, as defined in RFC 4360, is an optional transitive BGP
attribute. It 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” field (1 or 2-octets), allowing
you to provide granular control/filter routing information based on the type of
extended communities.
The BGP Extended Community commands are:
• deny
• deny regex
• description
• ip extcommunity-list
• match extcommunity
• permit
• permit regex
• set extcommunity rt
• set extcommunity soo
• show ip bgp ipv4 extcommunity-list
• show ip bgp paths extcommunity
• show ip extcommunity-list
• show running-config extcommunity-list
deny
c e s
Use this feature to reject (deny) from the two types of extended communities, Route
Origin (rt) or Site-of-Origin (soo).
Syntax
deny {rt | soo} {as4 ASN4:NN | ASN:NNNN | IPADDR:NN}
To remove (delete) the rule, use the
no deny {rt | soo} {as4 ASN4:NN | ASN:NNNN |
IPADDR:NN} command.
Version 7.7.1.0 Introduced support on C-Series
Version 7.6.1.0 Introduced IPv6 MGBP support for E-Series