Community lists

Community lists provide a means to filter BGP routes using a community string. They can be applied in a route map to match routes that have the community string defined in the community list.

To configure a community list:

config router community-list
    edit <name>
        set type {standard | expanded}
        config rule
            edit <id>
                set action {deny | permit}
                set regexp <string>
                set match <string>
            next
        end
    next
end

To use a community list in a route map to match a BGP community:

config router route-map
    edit <name>
        config rule
            edit <id>
                set match-community <string>
            next
        end
    next
end

match-community <string>

Match a BGP community list.

In an SD-WAN deployment, a remote BGP router or spoke may communicate a preferred interface or path to route traffic using a community string. See Using BGP tags with SD-WAN rules and Controlling traffic with BGP route mapping and service rules for examples.