ipv6 unicast-routing
router bgp 6
 neighbor 1234::10:6:1:2 remote-as 5
 neighbor 1234::10:4:1:1 remote-as 4
 address-family ipv6 unicast
  neighbor 1234::10:6:1:2 activate
  neighbor 1234::10:4:1:1 activate
  network 1234::10:6:0:0/96
  redistribute connected
  aggregate-address 1234::10:6:0:0/96 summary-only