rs2/ipv4: show protocols all pb_6_nav_as6718_1

pb_6_nav_as6718_1 BGP --- start 2019-07-15 Connect BGP Error: Hold timer expired

Description:    NAV Communications 1
  BGP state:          Connect
    Neighbor address: 2001:7f8:64:225::6718:1
    Neighbor AS:      6718
    Last error:       BGP Error: Hold timer expired
  Channel ipv6
    State:          DOWN
    Table:          t_6_nav_as6718_1
    Preference:     100
    Input filter:   (unnamed)
    Output filter:  (unnamed)
    Import limit:   150
      Action:       restart