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IPv6 Next Hop for IPv4 Prefix
In BGP Updates, NH not necessarily of same address family as NLRI
Currently deployed examples:
VPN-IPv4 family has IPv4 NH
though with bizarre encoding to make it syntactically “look like” a VPN-IPv4 address
IPv6 address family can have IPv4 next hop
using "IPv4-mapped IPv6 address", defined in RFC 4291 as an address of an IPv4 node
Might become typical deployment scenario in dual stack core, so that single BGP session running on IPv4 carries v4 and v6 prefixes.
Other special purpose address families (l2vpn, rt-constraint) have been defined with IP NHs, usually allowing the NH to be either v4 or v6, depending on its length.

PPT Version