Cisco Cisco Packet Data Interworking Function (PDIF)
Routing
▀ BGP-4 Routing
▄ VPC-VSM System Administration Guide, StarOS Release 19
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{ internet | local-AS | no-advertise | no-export | none | value AS-
community_number AS-community_number AS-community_number ... }
community_number AS-community_number AS-community_number ... }
The additive option allows you to enter multiple destinations and AS community numbers. For additional information,
see the Command Line Interface Reference.
see the Command Line Interface Reference.
Filtering via a BGP Community
To filter routes based on a BGP community, you configure a match clause in a route map. The command sequence
follows below.
follows below.
config
context context_name
route-map map_name { deny | permit } sequence_number
match community { named named_list | standard identifier }
BGP Extended Communities
Configuring a BGP Extended Community (Route Target)
A BGP extended community defines a route target. MPLS VPNs use a 64-bit Extended Community attribute called a
Route Target (RT). An RT enables distribution of reachability information to the correct information table.
Route Target (RT). An RT enables distribution of reachability information to the correct information table.
You configure a BGP extended community via a Context Configuration mode command.
config
context context_name
ip extcommunity-list { named named_list | standard identifier } { deny |
permit } rt rt_number rt_number rt_number ...
permit } rt rt_number rt_number rt_number ...
rt_number
specifies a Route Target as a 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 add multiple route numbers to an IP
extcommunity list.
extcommunity list.
Multiple extended community-list entries can be attached to an extended community-list by adding multiple permit or
deny clauses for various extended community strings. Up to 64 extended community-lists can be configured in a
context.
deny clauses for various extended community strings. Up to 64 extended community-lists can be configured in a
context.
Setting the Extended Community Attribute
You set the BGP extended community attribute via a set extcommunity command in a route map.
config
context context_name
route-map map_name { deny | permit } sequence_number
set extcommunity rtrt_number rt_number rt_number ...