BGP Communities Last Updated: (UTC)   The main purpose of BGP enabled routers is to advertise prefixes to other routers. These prefixes can be from several different address families, such as IPv4 and VPNv4. When advertising a prefix, BGP attaches extra information, called attributes. BGP uses these attributes to select the best path.   BGP can include more information with each prefix, in the form of Community Strings. A community string is a number value that the peer uses like a tag. Communities create routing policies between peers. By tagging prefixes with communities, we tell the peer to handle the prefixes in a special way. As an example, lets say that a specific group of prefixes need to have their weight set … Continue reading BGP Communities