The ranting of an IT Professional

Mar 7 2011   4:17PM GMT

ICMP redirect cache is empty



Posted by: Jason Tramer
Tags:
1921 router
Cisco
ICMP redirect cache is empty
IP routing
Show IP Route

I was deploying a new Cisco 1921 router and couldn’t get an internet connection going.  I did a Show IP route and saw no routes (not even my static) and got the message “ICMP redirect cache is empty”. After double checking that IP routing was enabled (it was), I rebooted but had the same issue. I did a “debug ip routing static” and then removed and re-added my static route. I then got an error dealing with the routing database.

In the end I turn off routing with a “No IP routing” and then turned it right back on with “IP Routing” and that immediately resolved the issue. It was very weird though.

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