The show ip route Command

Router# show ip route

This command is used to show the IP routing table on the router. It details the network as known to the router and its sources for the information (such as the routing protocols). This command is excellent for troubleshooting configuration errors and understanding how the network is communicating about its routes.

To see a particular network in the routing table, issue this command:

Router# show ip route network number

Example 4-1 shows the output of this command. Table 4-5 explains how to read this information.

Example 4-1 show ip route Output

SanJose#show ip route

Codes: C - connected, S - static, I - IGRP, 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, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR T - traffic engineered route

Gateway of last resort is not set

140.100.0.0/28 is subnetted, 3 subnets C 140.100.17.192 is directly connected, FastEthernet3/0

C 140.100.17.128 is directly connected, FastEthernet1/0

C 140.100.32.0 is directly connected, Fddi2/0

Bldg_1#show ip route

Codes: C - connected, S - static, I - IGRP, 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, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route, o - ODR

Gateway of last resort is not set

140.100.0.0/28 is subnetted, 3 subnets O 140.100.17.192 [110/20] via 140.100.17.129, 00:07:44, Ethernet0

C 140.100.17.128 is directly connected, Ethernet0

O 140.100.32.0 [110/11] via 140.100.17.129, 00:07:44, Ethernet0

Table 4-5 explains the meaning of the important fields.

Table 4-5 Explanation of the show IP route Command That Was Performed on Router Building 1

Table 4-5 explains the meaning of the important fields.

Table 4-5 Explanation of the show IP route Command That Was Performed on Router Building 1

Field	Explanation
O	Indicates the protocol that derived the route. Possible values include the
	following:
	I—IGRP-derived
	R—RIP-derived
	O—OSPF-derived
	C—Connected
	S—Static
	E—EGP-derived
	B—BGP-derived
	i—IS-IS-derived
140.100.17.192	Indicates the address of the remote network.
[110/20]	The first number in the brackets is the administrative distance of the information
	source; the second number is the metric for the route.
via 140.100.17.129	Specifies the address of the next router to the remote network.
00:07:44	Specifies the last time that the route was updated in hours:minutes:seconds.
Ethernet0	Specifies the interface through which the specified network can be reached.

These commands are useful to verify that the configuration has worked and that the OSPF network is functioning correctly. In a single-area environment, the full complexity of OSPF is not engaged. The full strength and complexity of OSPF come to the fore in the design and configuration of a multiarea network.

Continue reading here: RIP Version

Was this article helpful?

0 0