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Cisco DHCP client injects static routes in config

I have a Cisco 876 router running 12.4.(15)T5, configured as DHCP client.  This works nicely.

A Cisco 886 router, running 15.1 software also works with the DHCP client.  This also works but has the following strange beheaviour:

In the running-config an ip route 0.0.0.0 0.0.0.0 <dhcp assigned address> appears.

Also - some other static routes that are in the config using the dhcp keyword are duplicated with the dhcp-assigned address

Now - when a write mem is done, these dhcp-generated route entry's are stored in the startup-config...

This beheaviour is completely different and VERY unwanted.  After a change from DHCP server the config will simply stop working, when a write mem was done at the first DHCP situation.

Should we stop using write mem commands when a DHCP client is active in IOS?  Is it a bug? Is it a feature?

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New Member

Cisco DHCP client injects static routes in config

Ok, i'm probably hitting bug CSCtj89334....

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