What are the well known communities of the BGP community attribute?
A. The community attribute is a transitive, optional attribute designed to group destinations in a certain community and apply certain policies (such as accept, prefer, or redistribute). This table shows the well known BGP communities. Community Description Local-AS Use in confederation scenarios to prevent sending packets outside the local autonomous system (AS). no-export Do not advertise to external BGP (eBGP) peers. Keep this route within an AS. no-advertise Do not advertise this route to any peer, internal or external. none Apply no community attribute when you want to clear the communities associated with a route. internet Advertise this route to the internet community, and any router that belongs to it. Refer to the Configuring BGP Community Filtering section of Configuring BGP for more information about the configuration of communities.
