spb-rs1/ipv4: show protocols all ssn

ssn BGP --- start 2021-02-16 Passive Socket: Connection closed

Description:    ssn/212611/AS212611
  BGP state:          Passive
    Neighbor address: 185.1.152.89
    Neighbor AS:      212611
    Local AS:         50817
    Last error:       Socket: Connection closed
  Channel ipv4
    State:          DOWN
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   5000
      Action:       disable