4500 ARP Issue

Unanswered Question

I have a network consisting of 2 4500's and 16 or so 3750's. The network has 12 or so VLAN's and a few hundred devices. The 4500's do all inter VLAN routing. I had a computer that had become intermittent on the network when contacted from a different subnet (would answer 30-50% of pings) but was fine on the local subnet. I checked the ARP cache on the 4500 and the IP/MAC info was correct. I chased down the MAC in the CAM and that was correct also. As soon as I deleted the ARP entry, the problem cleared up.

We believe this problem has happened several times over the past few weeks on different computers.

Can anyone explain why a seemingly correct ARP entry would cause this intermittent problem?

Thanks in advance

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francisco_1 Wed, 10/29/2008 - 01:53
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I have experienced similar issues before. most cases it down to bad patch cable or the NIC driver needs updating.


tmoffett Thu, 03/12/2009 - 07:16
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Did you ever resolve this issue? I am seeing similar behavior. Switch is a 4507R with a single SUPIV.

It's driving me nuts!

chrish100 Thu, 03/12/2009 - 11:13
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No. We haven't resolved the issue but it seems to have calmed down lately, so it is unfortunately no longer on the front burner. Please update this string if you find anything out and I will do the same, but unless it acts up again I don't foresee me getting back to it in the next couple of weeks.


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