spb-rs1/ipv4: show protocols all gtu2

gtu2 BGP --- down 2021-07-23

Description:    gtu2/28773/AS-MASTER
  BGP state:          Down
    Neighbor address: 185.1.153.2
    Neighbor AS:      28773
    Local AS:         50817
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   500
      Action:       disable