Symptom

A router may crash after certain configuration patterns related to routing and VRFs.

Conditions

This conditions for this behaviour may be set if a router has ever had a VRF configured and if there's no "router ..." configured before disabling all routing using the "no ip routing" configuration command. The behaviour may then occur if "ip routing" is reconfigured and then any routing protocol is configured using "router ...". While a crash may not always result, there's a chance of memory corruption after this sequence of events.

Workaround

Configure any "router ...", even an empty one, before disabling routing with the "ip routing" configuration command. This should remove the condition for the behaviour. If "no ip routing" has already been issued, a reboot will be necessary before re-enabling it.

Further Problem Description