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Problem in ARP in Cisco 4006


I have encountered some problem in installing a Cisco 4006 Layer 2 switch with Nortel passport 1200 switch

There is a lot of FCS error and RX error in Cisco 4006 when one of server is carried out copy of some files from one server to another server.

I do not know if the GigEthernet link is unstable as the other of the GigaEthernet link is a Nortel Passport 1200.

They have encountered problem in get the DHCP and routing problem where the Nortel Passport 1200 cannot able to ping the ARP entries about Cisco 7206

router. The ARP entries can be see at the Nortel Passport 1200. Is there any way to verify that this is not the Cisco 4006 problem.

The current version for 4006 is 6.3.1 and browse through the release note and noticed that there is a bug on issue on 6.3.5. Can anyone advise on this whether this is the probelm. All server and switch port are set at 100M full duplex.

An ARP request packet from a server connected to a

Catalyst 4000 family switch with a GEC link may, on

rare occasions, be dropped. However, the ARP request

packet is not resolved, and the server will not be

able to communicate with other server and/or nodes.


Appreciated for any feedback on this problem.

Best Regards

Norman Tan

  • Other Network Infrastructure Subjects

Re: Problem in ARP in Cisco 4006

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

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