spb-rs2/ipv4: show protocols all comlink

comlink BGP --- start 2021-06-07 Passive

Description:    comlink/6858/AS-COMLINK
  BGP state:          Passive
    Neighbor address: 185.1.153.84
    Neighbor AS:      6858
    Local AS:         50817
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   500
      Action:       disable