pl-bgp/ipv6: show protocols all AS6939_SIT

AS6939_SIT BGP master up 2019-07-15 Established

Description:    Poland to AS6939
  Preference:     100
  Input filter:   (unnamed)
  Output filter:  (unnamed)
  Routes:         69915 imported, 4 exported, 35818 preferred
  Route change stats:     received   rejected   filtered    ignored   accepted
    Import updates:         426505          0         16       3411     423078
    Import withdraws:        77198          0        ---        138      77076
    Export updates:        6659663     446841    6212818        ---          4
    Export withdraws:       143836        ---        ---        ---          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:       134/180
    Keepalive timer:  2/60