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New Member

Problem on cat5500 with DHCP server

Hi,

We have a strange problem with a cat5513 switch getting IP from DHCP server.

We have a cat5509 with 9-giga port as core switch and have a cat5513 switch branched off from core switch (cat5509). DHCP server is connected to core switch(cat5509) and a DHCP-client is connected to cat5513.

DHCP server and client are in same network.

DHCP client is having a problem getting an ip address from DHCP server from cat5513, but if we connect cat2900 to cat5513 and connect DHCP-client to cat2900 switch, DHCP-client get an IP from DHCP.

Does anyone know why this happen??

Is there any similar command as "ip helper-address" in catOS??

Thank you

Dong

7 REPLIES
Cisco Employee

Re: Problem on cat5500 with DHCP server

There is no helper address concept in CATOS. Are your clients and server in the same VLAN? Have you got spanning tree portfast enabled?

http://www.cisco.com/warp/public/473/12.html

New Member

Re: Problem on cat5500 with DHCP server

If the 5509 is the VTP server make sure the 5513 is the VTP client and the domain names and VTP security are configured properly. (Reverse if 5513 is Server then 5509 is Client).

You can try changing the VLAN name (not number) on the VTP server and see if it changes on the connected switches. If not you have VTP issues.

New Member

Re: Problem on cat5500 with DHCP server

Hi,

Thank you very much...you guys have been a great help. :)

The solution was "portfast". It worked just nice as soon as we enabled "portfast.

Now...we are facing a different problem.

We have a 1U server connecting to Cat5500, and the server has a built-in intelpro 10/100 NIC.

It seems like there is a negotiation problem between the server and Cat5500.

We don't get any internet connection if we run a long cable from server to cat5500, but it works just fine if we move the server close to Cat5500 and run shorter cable.

We forced full-duplex and speed on both side, but no luck.

Thank you

Dong

Bronze

Re: Problem on cat5500 with DHCP server

I suggest you test the long cable that you used. You can get a CAT-5 cable tester to test end-to-end. This will tell you if you have a bad pair, and which one.

Mark

New Member

Re: Problem on cat5500 with DHCP server

Thanks for your reply, Mark.

There is no problem on cable. These cables are fully tested.

Thanks again

Dong

New Member

Re: Problem on cat5500 with DHCP server

Hi all,

Is it possible that the long cable is beyond 100meters - thus longer than that supported by Ethernet (or is that just in half-duplex scenarios?). Or possibly electrical noise could be an issue - are you getting errors on the port when using the long cable in comparison to using the shorter one?

New Member

Re: Problem on cat5500 with DHCP server

Thank for your reply... :)

No, the long cable is only about 30 feet long, and the short cable is about 6 feet long. I doubt that there is stronge eletrical noise that could be an issue either.

Anyway, the problem is resolved after putting 3com NIC into server for a replacement of on-board intel NIC.

We are not sure if it was hardware issue or driver for NIC..

Thank you everone for your help..

Dong

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