Multiprotocol Extensions for BGP
Multiprotocol BGP (MBGP), also referred to as BGP-4+ and often erroneously expanded to Multicast BGP, is defined in RFC 2283 and is negotiated via BGP capabilities. MBGP provides backward-compatible extensions to the BGP-4 protocol that let it carry information for network layer protocols other than IPv4, such as IPv6 and IPX. Although we won't spend a great deal of time on MBGP, we will cover the new attribute types, as well as touch on where MBGP is most often used today.
In order to support multiprotocol capabilities in BGP-4, two new attributes were introduced: Multiprotocol Reachable NLRI (MP_REACH_NLRI) and Multiprotocol Unreachable NLRI (MP_UNREACH_NLRI).
Multiprotocol Reachable NLRI (MP_REACH_NLRI) is ...
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