RFC 1997 - BGP Communities Attribute - Standard defining an extension which allows destinations to be grouped, allowing group-based routing policies. - http://tools.ietf.org/html/rfc1997
RFC 4276 - BGP-4 Implementation Report - Informational document showing the features and differences in certain common implementations. - http://tools.ietf.org/html/rfc4276
RFC 4275 - BGP-4 MIB Implementation Survey - Informational document showing which parts of the SNMP MIB are provided by certain common implementations. - http://tools.ietf.org/html/rfc4275
RFC 4274 - BGP-4 Protocol Analysis - Informational RFC describing how BGP fulfils the requirements for classless inter-domain routing, and its scalability and performance. - http://tools.ietf.org/html/rfc4274