spb-rs2/ipv4: show protocols all dancer

dancer BGP --- start 2021-06-06 Passive Error: Link down

Description:    dancer/52015/AS-DANCER
  BGP state:          Passive
    Neighbor address: 185.1.153.71
    Neighbor AS:      52015
    Local AS:         50817
    Last error:       Error: Link down
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   500
      Action:       disable