Solved: ISR : Behaviour to Ping packets

gauravprakash · ‎11-06-2008

Hi,

Do Cisco ISR routers give low priority to ICMP packets (request/reply)? Is this inbuilt in IOS ?

Rgds,

Gaurav

Richard Burts · ‎11-07-2008

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.

HTH

Rick

HTH

Rick

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tcordier · ‎11-07-2008

No. The default configuration for a Cisco router is a single FiFo (first-in, first-out) queue. All packets are send in the order in which they arrive. Only when you configure QoS or queuing other that FiFo (e.g. Priority queueing), the router will apply different priorities to packets.

HTH, Thomas

Joseph W. Doherty · ‎11-07-2008

Not 100% positive what ISR defa