https://datatracker.ietf.org/doc/draft-bates-bgp4-multiprotocol/
draft-bates-bgp4-multiprotocol-03 - Multiprotocol Extensions for BGP-4
Currently BGP-4 [BGP-4] is capable of carrying routing information only for IPv4 [IPv4]. This document defines extensions to BGP-4 to enable it to carry...
draftbatesmultiprotocolextensionsbgp