spb-rs2/ipv4: show protocols all Istranet

Istranet BGP --- start 2019-05-16 Connect Socket: Connection closed

Description:    Istranet/42291/AS-Istanet
  BGP state:          Connect
    Neighbor address: 31.44.186.182
    Neighbor AS:      42291
    Last error:       Socket: Connection closed
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   5000
      Action:       disable