a few useful show IP command
sh ip route
R1#sh ip route
Codes: 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
Gateway of last resort is not set
172.16.0.0/30 is subnetted, 2 subnets
C 172.16.1.0 is directly connected, Serial0/1
C 172.16.2.0 is directly connected, Serial0/0
10.0.0.0/24 is subnetted, 1 subnets
D 10.1.1.0 [90/2195456] via 172.16.1.2, 00:02:01, Serial0/1
C 192.168.1.0/24 is directly connected, Loopback1
- type of network ; static, connected
- or how the router learn it ; EIGRP, OSPF.from which interface it learned
lets be more specific
show ip route [address]
R1#sh ip rou 10.1.1.1
Routing entry for 10.1.1.0/24
Known via "eigrp 1", distance 90, metric 2195456, type internal
Redistributing via eigrp 1
Last update from 172.16.1.2 on Serial0/1, 00:07:16 ago
Routing Descriptor Blocks:
* 172.16.1.2, from 172.16.1.2, 00:07:16 ago, via Serial0/1
Route metric is 2195456, traffic share count is 1
Total delay is 21000 microseconds, minimum bandwidth is 1544 Kbit
Reliability 255/255, minimum MTU 1500 bytes
Loading 1/255, Hops 1
- how its learned . ex; EIGRP, static or connected..
- how long since the route learned, this can be useful when you want to check how long link down, up time.. etc,
- the bandwidth information are reflected by the value configured on the interface .. what ever value you put, its gonna show the same in here
show ip route connected
show ip route static
- issue this two cmd if you want to filter or be more specific on the type of route
show ip route summary
R1#sh ip rou sum
IP routing table name is Default-IP-Routing-Table(0)
IP routing table maximum-paths is 16
Route Source Networks Subnets Overhead Memory (bytes)
connected 1 2 216 408
static 0 0 0 0
eigrp 1 0 1 72 136
internal 2 2312
Total 3 3 288 2856
Removing Queue Size 0
- this will summarize all you information base on Net, Subnet, Overhead(other memory used) and Memory
