The address family information field of MP_REACH_NLRI consists of a 2-byte address family identifier AFI and a 1-byte sub-address family identifier SAFI. When public IPv4 routes are transmitted…

The address family information field of MP_REACH_NLRI consists of a 2-byte address family identifier AFI and a 1-byte sub-address family identifier SAFI. When public IPv4 routes are transmitted under the BGP-IPv4 unicast address family, SAFI is 1. When public IPv6 routes are transmitted under the BGP- IPv6 unicast address family, SAFI is also 1.