tll-rs2/ipv4: show protocols all Megagroup

Megagroup BGP --- start 2021-06-12 Passive Error: Link down

Description:    Megagroup/60357/AS60357
  BGP state:          Passive
    Neighbor address: 37.9.49.30
    Neighbor AS:      60357
    Local AS:         57936
    Last error:       Error: Link down
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   5000
      Action:       restart