Reference Guide

BGP Extended Communities (RFC 4360)
BGP Extended Communities, as defined 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” field (1 or 2-octets), allowing you to provide granular
control/filter routing information based on the type of extended communities.
deny
Use this feature to reject (deny) from the two types of extended communities, route origin (rt) or site-of-
origin (soo).
S5000
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.
Parameters
rt Enter the keyword rt to designate a Route Origin
community.
soo Enter the keyword soo to designate a Site-of-Origin
community (also known as Route Origin).
as4 ASN4:NN Enter the keyword as4 followed by the 4-octet AS specific
extended community number in the format ASN4:NN (4-
byte AS number:2-byte community value).
ASN:NNNN Enter the 2-octet AS specific extended community number
in the format ASN:NNNN (2-byte AS number:4-byte
community value).
IPADDR:NN Enter the IP address specific extended community in the
format IPADDR:NN (4-byte IPv4 Unicast Address:2-byte
community value).
Defaults Not configured.
Command
Modes
CONFIGURATION (conf-ext-community-list)
Command
History
Version 9.0(1.3) Introduced on the S5000.
Related
Commands
permit – configures to add (permit) rules.
show ip extcommunity-list – displays the extended community list.
Border Gateway Protocol IPv4 (BGPv4)
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