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New Member

Unwanted output in "debug ip packet"

Hi everyone,

I have been using "debug ip packet" on a Cisco 2921 running IOS 15.1(4)M1. The problem I have is that, although I am using an ACL to limit the output, I am seeing some output that is distracting from what I am trying to see. Specifically, I am seeing the following:

Mar 19 20:22:36.135:  IP: s=192.168.20.253, d=224.0.0.2, pak 30DB6D4C consumed in input feature , packet consumed, MCI Check(80), rtype 0, forus FALSE, sendself FALSE, mtu 0, fwdchk FALSE

Mar 19 20:22:38.951:  IP: s=192.168.20.253, d=224.0.0.2, pak 2A74FFE8 consumed in input feature , packet consumed, MCI Check(80), rtype 0, forus FALSE, sendself FALSE, mtu 0, fwdchk FALSE

These would appear to be HSRP messages. But I don't understand why they are appearing when I configure "debug ip packet 101". The ACL is pretty simple:

access-list 101 permit icmp host 96.87.145.1 host 192.168.20.1

access-list 101 permit icmp host 192.168.20.1 host 96.87.145.1

So I thought the implicit "deny ip any any" would block these messages. I even tried to block them specifically using an extra line:

access-list 101 deny   udp host 192.168.20.253 host 224.0.0.2 eq 1985

But still they show up! Any ideas?

Thanks, Graham

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Accepted Solutions
New Member

Unwanted output in "debug ip packet"

Hi Graham

The router seems to be hitting the bug CSCtx12810:

     http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtx12810

I would let you know the IOS versions which would contain a fix for this bug.

Regards

Sush

3 REPLIES
New Member

Unwanted output in "debug ip packet"

Hi Graham

The router seems to be hitting the bug CSCtx12810:

     http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtx12810

I would let you know the IOS versions which would contain a fix for this bug.

Regards

Sush

New Member

Unwanted output in "debug ip packet"

The IOS versions from 15.2(1)T2 onwards should contain the fix for this bug.

Sush


New Member

Unwanted output in "debug ip packet"

Awesome! Thanks Sush!

I shall now have a think about whether it's worthwhile upgrading the IOS just to get around this bug

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