Do Cisco ISR routers give low priority to ICMP packets (request/reply)? Is this inbuilt in IOS ?
I think that there are at least two ways to understand the question from Gaurav. Thomas and Joseph have understood it in terms of priority in forwarding the traffic. But I wonder if Gaurav was asking about the processing of ICMP (when the ICMP destination is the router itself). And the answer to that is that yes the IOS treats processing ICMP packets and generating responses as a lower priority task. And that is built into IOS.