ipv6 unicast-routing
router bgp 2
 neighbor 1234::10:2:1:2 remote-as 3
 neighbor 1234::10:1:1:1 remote-as 1
 address-family ipv6 unicast
  neighbor 1234::10:2:1:2 activate
  neighbor 1234::10:1:1:1 activate
  network 1234::10:2:0:0/96
  redistribute connected
  aggregate-address 1234::10:2:0:0/96 summary-only