Why do I lose part of the configuration after some Versatile Interface Processor (VIP) crashes?
A. After a VIP crash, the Route/Switch Processor (RSP) is no longer able to initialize the VIP. This problem can be due to a hardware failure in the VIP (which can be put into disabled analyzed wedged state by the RSP). Because the VIP is disabled, all the physical interfaces that belong to the VIP no longer exist for the RSP. The configuration disappears from the running configuration. In addition, you cannot issue a show interfaces command for such interfaces. If a virtual interface uses disabled physical interfaces, the virtual interface is also affected. A workaround is to keep a backup configuration in a secure place. After a replacement, when the VIP is up and running, you can copy the startup configuration to the running configuration (whether or not the startup configuration was previously synchronized to the actual running configuration). Alternatively, you can manually edit the configuration to ensure that the configuration is the same as it was before the VIP crash.
