I am wondering if it is possible via configurations to make sure that IPSEC processing does not off load to the main processor in the case of VAM card (Encryption Card) failure. Or if it is possible to have a secondary VAM card in the 7200 Chassis. (7206 VXR NPE400)
What I observed is; in one of the routers VAM card failed during production and after that failure router become dead slow. I think this is mainly due to the fact that IPSEC processing moved to the main CPU and caused high load on the main CPU which created a blackhole device since Routing protocols were still running fine.
I can't ensure you can force the router not to offload to the main processor during VAM failure. However, we can install two VAM in a single chassis that it may help to solve your problem. But in VAM, you need to use NPE-G1 for daul VAM. You may also consider to upgrade to two VAM2 and it does not mention to require higher NPE.
I recommend to consult w/ your Cisco reseller for the compatibility of dual VAM in your current system.
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