rs2/ipv4: show protocols all pb_4_tier_as50515_1

pb_4_tier_as50515_1 BGP --- start 2020-12-18 Active Socket: Connection closed

Description:    Tier 1
  BGP state:          Active
    Neighbor address: 86.104.125.149
    Neighbor AS:      50515
    Connect delay:    3.474/5
    Last error:       Socket: Connection closed
  Channel ipv4
    State:          DOWN
    Table:          t_4_tier_as50515_1
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   50
      Action:       restart