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In order to see the routing table on a Cisco device, run the show ip route command. Parameters such as eigrp, ospf, bgp, etc may be used to filter results.
When you look at the routing table on a Cisco router, you will see one of many things
All the way to the left, you will see certain letters and numbers, this all depends on what kind of route made it into the routing table.
Codes:
- L - local
- C - connected
- S - static
- R - RIP
- M - mobile
- B - BGP
- D - EIGRP
- EX - EIGRP external
- O - OSPF
- IA - OSPF inter area
- N1 - OSPF NSSA external type 1
- N2 - OSPF NSSA external type 2
- E1 - OSPF external type 1
- E2 - OSPF external type 2
- i - IS-IS
- su - IS-IS summary
- L1 - IS-IS level-1
- L2 - IS-IS level-2
- ia - IS-IS inter area
- * - candidate default
- U - per-user static route
- o - ODR
- P - periodic downloaded static route
- H - NHRP
- l - LISP
- a - application route
- + - replicated route
- % - next hop override
You will then see the route prefix, such as 192.168.1.0, followed by a [AD|Metric]
The AD is the Administrative Distance of the route, and the metric associated with the route.
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