Administrative Distance / Route Preference
ベンダによって値や順序の異なり RFC でも一切定められていない AD 値のまとめ。よく使うプロトコル・ベンダーのみ記載。 小さいほど強い NOS が大多数。
| Protocol | Default Preference | - | - | - | - |
|---|---|---|---|---|---|
| - | Cisco | Arista | Juniper | FRR | BIRD *2 |
| Connected | 0 | 0? | 0 | 0 | 240 |
| Static | 1 | 1 | 5 | 1 | 200 |
| Static LSP | ? | 1 *1 | 6 | - | - |
| RSVP-signaled LSP | ? | 1 *1 | 7 | - | - |
| LDP-signaled LSP | ? | 1 *1 | 9 | - | - |
| OSPF (internal) | - | - | 10 | - | - |
| IS-IS (L1 internal) | - | - | 15 | - | - |
| IS-IS (L2 internal) | - | - | 18 | - | - |
| eBGP | 20 | - | - | 20 | - |
| OSPF (all) | 110 | 110 | - | 110 | 150 |
| IS-IS (all) | 115 | 115 | - | 115 | - |
| Aggregate (Juniper) | - | - | 130 | - | - |
| OSPF (AS external) | - | - | 150 | - | - |
| IS-IS (L1 external) | - | - | 160 | - | - |
| IS-IS (L2 external) | - | - | 165 | - | - |
| BGP (all) | - | 200 | 170 | - | 100 |
| iBGP | 200 | - | - | 200 | - |
| (Not installed to RIB/FIB) | 255 | 255? | ? | 255 | - |