Ip redirects - which direction?

I am troubleshooting an issue with CPU utilization on a 3750X stack. The show controllers cpu-interface tells me that the icmp queue counter is growing quite fast ... about 5000 per second. I read that this is a queue for ICMP redirect messages.
Now, I know what ICMP redirects are about, and how they are supposed to work. What I need to know is what would be the effect of the no ip redirects command on the SVI of the switch? Which direction of traffic does it apply to? Would it be:
If I receive a packet, and I know a better router that could handle it, but I will not send a redirect to tell the host so,
If I forward a packet, and receive a redirect, then I will not take the redirection into account,
Both of the above,
None of the above.
Thanks in advance.
Kevin Dorrell
Luxembourg

Thanks for all your help guys. This forum is awesome. Yes, I know I could sort it out by going into a corner with GNS3, but somehow talking it over with my peers is a much better way of learning.
Anyway, I did go and try a few things in the lab. First of all, Rick is right to say that the router does not take any account of incoming redirects ... unless you have no ip routing, in which case you have a host and not a router any more. If you do disable ip routing, then it does take account of redirects, storing them in a cache which you can see with show ip redirects. Now, if it is acting as a host, can you get it to ignore the redirects? No you cannot. The command no ip redirects has no effect on incoming redirects. So the router is behaving as a host, and not a very secure one at that(!).
I also tested the normal operation of ip redirects, and no ip redirects does disable the generation of IP redirect message.
I did find one difference between my router lab and my live production 3750X though. In the lab, my 3640 did not attempt to generate an ip redirect to the alternate gateway unless the alternate gateway was on the same subnet as the source of the original packet. So it would not generate a redirect for a packet that was coming in from its primary subnet and getting sent out to a gateway in its secondary subnet.
Kevin Dorrell
Luxembourg

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Message was edited by: hanerlend
Message was edited by: hanerlend

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