Configuring Community Attribute Advertisement

A community attribute defined in a routing policy takes effect only after community attribute advertisement is configured.

Procedure

Use a route-policy to define specific community attributes when configuring BGP4+ community attribute advertisement.
1. Run system-view
  The system view is displayed.
2. Run bgp as-number
  The BGP view is displayed.
3. Run ipv6-family unicast
  The BGP-IPv6 unicast address family view is displayed.
4. Run peer ipv6-address route-policy route-policy-name export
  An export route-policy is configured.
5. Run either of the following commands as required to advertise community attributes to a specified peer.
  - To enable the device to advertise a standard community attribute to a specified peer, run the peer ipv6-address advertise-community command.
  - To enable the device to advertise an extended community attribute to a specified peer, run the peer ipv6-address advertise-ext-community command.
    
    After the peer advertise-ext-community command is run, BGP4+ advertises the routes with extended community attributes to the specified peer. If the peer only needs to accept the routes but not the extended community attributes, you can run the peer discard-ext-community command on the peer to discard the extended community attributes from the received routing information.
6. Run commit
  The configuration is committed.
Use a route-filter to define specific community attributes when configuring BGP4+ community attribute advertisement.
1. Run system-view
  The system view is displayed.
2. Run bgp as-number
  The BGP view is displayed.
3. Run ipv6-family unicast
  The BGP-IPv6 unicast address family view is displayed.
4. Run peer ipv6-address route-filter route-filter-name export
  An export route-filter is configured.
5. Run either of the following commands as required to advertise community attributes to a specified peer.
  - To enable the device to advertise a standard community attribute to a specified peer, run the peer ipv6-address advertise-community command.
  - To enable the device to advertise an extended community attribute to a specified peer, run the peer ipv6-address advertise-ext-community command.
    
    After the peer advertise-ext-community command is run, BGP4+ advertises the routes with extended community attributes to the specified peer. If the peer only needs to accept the routes but not the extended community attributes, you can run the peer discard-ext-community command on the peer to discard the extended community attributes from the received routing information.
    
    To enable the device to advertise the Link Bandwidth extended community attribute to a specified EBGP peer, run the peer advertise ebgp link-bandwidth command.
    
    To enable the device to convert the Link Bandwidth extended community attribute (optional non-transitive) carried in BGP4+ routes to an optional transitive attribute before advertising the routes to other peers, run the peer advertise link-bandwidth transitive command.
6. Run commit
  The configuration is committed.