BGP Large Community configuration examples

Defining a large community standard ACL

The following example creates a standard large-community list.

device# configure terminal
device(config)# ip large-community-list standard my_std_list seq 10 permit 64497:1:528

Defining a large community extended ACL

The following example creates an extended community list with a regular expression.

device# configure terminal
device(config)# ip large-community-list extended my_ext_list seq 10 permit 64497:*:*

Defining a large community list in a route map

Each route-map instance can have only one set large-community directive in which you can define a maximum of 32 large communities. The following example sets a large-community list in route-map instances to advertise routes with large-community attributes.

device# configure terminal
device# configure terminal
device(config)# route-map myroutes permit 10
device(config-route-map-myroutes/permit/10)# set large-community 64497:1:528
device(config-route-map-myroutes/permit/10)# exit
device(config)# route-map myroutes permit 20
device(config-route-map-myroutes/permit/20)# set large-community 64497:5:528
device(config-route-map-myroutes/permit/20)# exit
device(config)# route-map myroutes permit 30
device(config-route-map-myroutes/permit/30)# set large-community 64497:6:528

The following example configures multiple large communities for a set large-community directive.

device# configure terminal
device(config)# route-map myroutes permit 10
device(config-route-map-myroutes/permit/10)# set large-community 64497:1:528 64497:2:529

The following example sets a large-community list in a route-map instance and appends updates to existing attributes.

device# configure terminal
device(config)# route-map myroutes permit 10
device(config-route-map-myroutes/permit/10)# set large-community 64497:1:528 additive

Defining a route map matching a large-community access list

The following example shows how to configure matching based on a large-community access list named ABCPath for a route map named myroutes.

device# config terminal
device(config)# route-map myroutes permit 10
device(config-route-map myroutes/permit/10)# match large-community ABCPath

The following example shows how to configure matching based on a large-community access list named lcstdacl1 with an exact match for a route map named myroutes.

device# config terminal
device(config)# route-map myroutes permit 10
device(config-route-map myroutes/permit/10)# match large-community lcstdacl1 exact-match

Defining a route map to delete large community attributes

The following example deletes community attributes specified in the ACL from the route update. instance.

device# configure terminal
device(config)# route-map myroutes permit 10
device(config-route-map-myroutes/permit/10)# set large-community-list mylargecommunitylist delete

Enabling the sending of large community attributes in BGP attributes

Note

Configure the BGP neighbor before executing the neighbor send community command.

If you use the neighbor send-community command after a BGP session has been established, the BGP session must be reset for this change to take effect.

The following example sends the large community attributes in BGP attributes.

device# configure terminal
device(config)# router bgp
device(config-bgp)# address-family ipv4 unicast
(config-bgp-ipv4u)# neighbor 10.11.12.13 send-community large 

The following example sends all communities.

device# configure terminal
device(config)# router bgp
device(config-bgp)# address-family ipv4 unicast
(config-bgp-ipv4u)# neighbor 10.11.12.13 send-community all 

The following example adds the configured route-map for a peer route-map out.

device# configure terminal
device(config)# router bgp
device(config-bgp)# address-family ipv4 unicast
(config-bgp-ipv4u)# neighbor 10.11.12.13 route-map out myroutes