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3COM switch/Cisco 2600 Router

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7 replies

by charliedavis

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Have a Cisco 2600 ethernet port connected to a 3com 24 port 10/100 switch(Can't recall model). Switch does support 10/100 full duplex however when attempting to implement full duplex 10 or 100 to Cisco router it will not recognize duplex mode and drops communication. Qnyone familiar with this problem? Sounds like Cisco proprietary issue to me but just want to verify.

Thanks in advance,
Charlie Davis

7 replies

by kahindo

I haven't had the issue, but I don't think this should be an issue. You don't need full duplex on a router ethernet interface, unless you are routing between vlans, reason being, all the other interface are very much slower than the ethernet (typically in kbs against mbps).

There are some issues with autonegotiation and I believe turning full both interfaces to full duplex (router and switch) should sort out the issue. Also don't fail try different ports, mainly on the switch, could be afaulty port.

The debugs could also help you get to know the issue with the autonegotiation.

by mshavrov

Sorry, but are you sure you have 3Com SWITCH? Isn't it HUB? They look absolutely the same. In this case it will never work...

Second: Disable router interface before you make changes. May be disconnect it from the switch. Then configure port speed and duplex settings. Connect interface, and then enable it. Sometimes it does not switch modes even with Cisco Switches.

Good luck.

by montea7

Make sure that your 2600 model has Fast Ethernet lan port. If it does not you will not be able to use full duplex.

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