FreeKB - Cisco IOS Routing table
Cisco IOS - Routing table

Follow these directions to routing table on a Cisco router or switch in IOS.

  1. In IOS, type enable and press enter
  2. Type show ip route and press enter. The routing table is displayed.

Here is a simplified example routing table.

Gateway of last resort is to network
D [1/2] via, 1424:17:58,
C is directly connected, GigabitEthernet0/0 is variably subnetted, 2 subnets, 2 masks
C is directly connected, GigabitEthernet0/0L is directly connected, GigabitEthernet0/0

Notice GigabitEthernet0/0.  GigabithEthernet0/0 connects to the switch and the LAN.

  • Routes that begin with the letter C are connected routes.
  • Routes that being with the letter D are EIGRP (enhanced interior gateway routing protocol).

When the router receives a packet with destination IP address 192.168.x.x, the packet is sent out the GigabithEthernet0/0 interface (to the switch).  When the router receives a packet where the destination IP address is not 192.168.x.x, the Gateway of last resort is used, which is Serial 0/0/0 which connects to the ISP.

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