bgp default ipv4-unicast
Causes all neighbors subsequently created with the neighbor remote-as or neighbor peer-group commands to be automatically activated in the IPv4 unicast address family. The no version disables the IPv4 unicast address family on all neighbors.
[ no ] bgp default ipv4-unicast
Address Family Configuration, Router Configuration
Release Information Command introduced before JUNOSe Release 7.1.0.