What each command does, when you need it, its sample output, and ready answers to common questions. Search anything, or tap a mode to see only the commands you can type at that prompt.
| Connected | 0 |
| Static | 1 |
| EIGRP summary | 5 |
| eBGP | 20 |
| EIGRP internal | 90 |
| OSPF | 110 |
| RIP | 120 |
| EIGRP external | 170 |
| iBGP | 200 |
| Unusable | 255 |
| up / up | Working |
| admin down / down | Interface is shut down. Type no shutdown. |
| up / down | Layer 2 problem: encapsulation, clock rate, keepalives |
| down / down | Physical: cable, port, far end off |
| Type 1 | Router LSA, stays in its area |
| Type 2 | Network LSA, from the DR |
| Type 3 | Summary, ABR between areas |
| Type 4 | ASBR summary |
| Type 5 | External, from ASBR (blocked in stub/NSSA) |
| Type 7 | NSSA external, ABR turns into Type 5 |