spb-rs1/ipv4: show protocols all linkey

linkey BGP --- up 2021-10-12 Established

Description:    linkey/13002/AS-ISIX
  BGP state:          Established
    Neighbor address: 185.1.152.141
    Neighbor AS:      13002
    Local AS:         50817
    Neighbor ID:      213.159.127.10
    Local capabilities
      Multiprotocol
        AF announced: ipv4
      Route refresh
      Graceful restart
      4-octet AS numbers
      Enhanced refresh
      Long-lived graceful restart
    Neighbor capabilities
      Multiprotocol
        AF announced: ipv4
      Route refresh
      Graceful restart
        Restart time: 120
        AF supported: ipv4
        AF preserved: ipv4
      4-octet AS numbers
      Long-lived graceful restart
    Session:          external route-server AS4
    Source address:   185.1.152.255
    Hold timer:       82.345/90
    Keepalive timer:  21.895/30
  Channel ipv4
    State:          UP
    Table:          master4
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   500
      Action:       disable
    Routes:         15 imported, 0 filtered, 106517 exported, 15 preferred
    Route change stats:     received   rejected   filtered    ignored   accepted
      Import updates:             60          0          0         45         15
      Import withdraws:            0          0        ---          0          0
      Export updates:         549964         15       1093        ---     548856
      Export withdraws:       275355        ---        ---        ---     275936
    BGP Next hop:   185.1.152.255