tll-rs2/ipv4: show protocols all gfn

gfn BGP --- down 2021-05-11

Description:    gfn/50889/AS50889
  BGP state:          Down
    Neighbor address: 37.9.49.61
    Neighbor AS:      50889
    Local AS:         57936
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   5000
      Action:       disable