Cisco ASR 5000 Series Administration Guide

•
The redistribution options are connected, ospf, rip, or static. Refer to the Border Gateway Protocol
Configuration Mode Commands chapter of the Command Line Interface Reference for details on the
redistribute command.
•
A maximum of 64 route-maps are supported per context.
•
Save your configuration as described in the Verifying and Saving Your Configuration chapter.
BGP Communities and Extended Communities
Route filtering based on a BGP community or extended community (route target) is configured via CLI Route
Map Configuration mode commands.
BGP Communities
Configuring a BGP Community
A BGP community is a group of destinations that share some common attribute. Each destination can belong
to multiple communities. Autonomous system administrators define to which communities a destination
belongs.
You configure a BGP community via a Context Configuration mode command.
config
context context_name
ip community-list { named named_list | standard identifier } { deny | permit } { internet | local-AS
| no-advertise | no-export | value AS-community_number AS-community_number AS-community_number
...}
{ internet | local-AS | no-advertise | no-export | value AS-community_number
AS-community_number AS-community_number ...}
{ internet | local-AS | no-advertise | no-export | value AS-community_number
AS-community_number AS-community_number ...}
You can permit or deny the following BGP community destinations.
• internet – Advertise this route to the internet community, and any router that belongs to it.
• local-AS – Use in confederation scenarios to prevent sending packets outside the local autonomous
system (AS).
• no-advertise – Do not advertise this route to any BGP peer, internal or external.
• no-export – Do not advertise to external BGP (eBGP) peers. Keep this route within an AS.
• value AS-community_number – Specifies a community string in AS:NN format, where AS = 2-byte
AS-community hexadecimal number and NN = 2-byte hexadecimal number (1 to 11 characters).
You can enter multiple destinations and AS community numbers for each community. For additional
information, see the Command Line Interface Reference.
Multiple community-list entries can be attached to a community-list by adding multiple permit or deny clauses
for various community strings. Up to 64 community-lists can be configured in a context.
ASR 5500 System Administration Guide, StarOS Release 21.4
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Routing
BGP Communities and Extended Communities

Cisco ASR 5000 Series Specifications

General

Brand	Cisco
Model	ASR 5000 Series
Category	Network Router
Language	English