Service Manual

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).
IPADDR:NN Enter the IP address specic extended community in the format IPADDR:NN (4-
byte IPv4 Unicast Address:2-byte community value).
additive (OPTIONAL) Enter the keyword additive to add to the existing extended
community.
non-trans (OPTIONAL) Enter the keywords non-trans to indicate a non-transitive BGP
extended community.
Defaults none
Command Modes ROUTE MAP (cong-route-map)
Command History
This guide is platform-specic. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version 8.3.19.0 Introduced on the S4820T
Version 8.3.11.1 Introduced on the Z-9000.
Version 8.3.7.0 Introduced on the S4810.
Version 7.8.1.0 Introduced on the S-Series.
Version 7.7.1.0 Introduced on the C-Series.
Version 7.6.1.0 Introduced on the E-Series.
Usage Information
If the set community rt and soo are in the same route-map entry, the behavior denes as:
• If the rt option comes before soo, with or without the additive option, soo overrides the
communities
rt sets.
Border Gateway Protocol
441