[feature] Peers with default route

[romain-fontugne]

I recently found that a few peers announce a default route in RRC10, i.e. they have an entry for prefix 0.0.0.0/0:

TABLE_DUMP2|1673308800|B|217.29.66.120|15605|0.0.0.0/0|15605|IGP|217.29.66.120|0|0||NAG||
TABLE_DUMP2|1673308800|B|217.29.67.13|57111|0.0.0.0/0|57111 41327|IGP|217.29.67.13|0|0||NAG||
TABLE_DUMP2|1673308800|B|217.29.67.55|199524|0.0.0.0/0|199524 174|IGP|217.29.67.55|0|0||NAG||

I'm not sure this is intentional so it may be good to flag this in peer-stats?

[digizeph]

I saw these default routes quite common. I think for the non-full-feed peers (i.e. non-DFZ), I'd actually expect to see default routes. I'll find a way to mark this in the output.

[digizeph]

Something like a announce_default field in the output JSON file could be a good solution

{
  "collector": "route-views.sg",
  "peers": {
    "2001:de8:4::13:6168:1": {
      "asn": 136168,
      "ip": "2001:de8:4::13:6168:1",
      "num_connected_asns": 4,
      "num_v4_pfxs": 0,
      "num_v6_pfxs": 40
      "announce_default": true
    },
    "project": "route-views",
    "rib_dump_url": "http://archive.routeviews.org/route-views.sg/bgpdata/2022.02/RIBS/rib.20220205.1800.bz2"
  }
}

[romain-fontugne]

Yes, that looks good to me 👍