spb-rs2/ipv4: show protocols all AirNet

AirNet BGP --- start 2019-09-30 Active Socket: Connection closed

Description:    AirNet/44923/AS44923
  BGP state:          Active
    Neighbor address: 31.44.186.29
    Neighbor AS:      44923
    Connect delay:    0.926/5
    Last error:       Socket: Connection closed
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   5000
      Action:       disable