http://tools.ietf.org/html/draft-ietf-l3vpn-2547bis-mcast-bgp-08	mcast vpn
http://www.iana.org/assignments/safi-namespace				SAFI namespace index
http://tools.ietf.org/html/draft-ietf-grow-mrt-15			MRT routing information export format

http://tools.ietf.org/html/rfc3032	MPLS Label Stack Encoding
http://tools.ietf.org/html/rfc4360	Extended Community Attribute
http://tools.ietf.org/html/rfc4364	BGP/MPLS IP Virtual Private Networks (VPNs)
http://tools.ietf.org/html/rfc4364	MPLS-labeled VPN address
http://tools.ietf.org/html/rfc4659	BGP-MPLS IP Virtual Private Network (VPN) Extension for IPv6 VPN	2/128
http://tools.ietf.org/html/rfc4760	Subsequent Address Family Identifiers (SAFI)
http://tools.ietf.org/html/rfc4762	Virtual Private LAN Service (VPLS)
http://tools.ietf.org/html/rfc5549	Advertising IPv4 nlri with an IPv6 Next Hop
