ip default-gateway

Command

IP Default Gateway

Use

This command allows the router to maintain routing functionality when it stops being a router. What that means is that, after a router crashes, it falls back to basic switching functionality. The default-gateway is where the router will send all packets.

Syntax

Router(config)#ip default-gateway <ip address>

Example

In the below example R1 has lost routing functionality, we will set a default gateway so it can restore reachbility.

R1(config)#do show ip route
Default gateway is not set

Host Gateway Last Use Total Uses Interface
ICMP redirect cache is empty

After we add the default gateway we can now ping R2's loopback.

R1(config)#do show ip route
Default gateway is 10.1.1.2

Host Gateway Last Use Total Uses Interface
ICMP redirect cache is empty
R1(config)#do ping 2.2.2.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
!!!!!

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