pl-bgp/ipv6: show protocols all AS6939_SIT

AS6939_SIT BGP master up 2019-03-20 Established

Description:    Poland to AS6939
  Preference:     100
  Input filter:   (unnamed)
  Output filter:  (unnamed)
  Routes:         60037 imported, 4 exported, 28985 preferred
  Route change stats:     received   rejected   filtered    ignored   accepted
    Import updates:         506681          0          4      62541     444136
    Import withdraws:        28334          0        ---        329      28009
    Export updates:        6407801     704758    5703039        ---          4
    Export withdraws:        53751        ---        ---        ---          0
  BGP state:          Established
    Neighbor address: 2001:470:12:58::1
    Neighbor AS:      6939
    Neighbor ID:      216.66.84.54
    Neighbor caps:    refresh AS4
    Session:          external AS4
    Source address:   2001:470:12:58::2
    Hold timer:       167/180
    Keepalive timer:  17/60