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Cisco - Nortel compatability

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Lybar

Lybar

Technical User
May 2, 2007
4
CA
I have a Cisco 2950 switch that I connect to another network that uses Nortel Baystack 420. I find that the Cisco switch will constantly show duplex mismatch. I have hard coded both switches to 100 full and the problem presets. Has anyone ever experienced a similar problem and how did you work around it?
 
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You've double checked your crossover cable between the two? Usually, a faulty cable will cause issues like that.
 
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I haven't checked the cable but I've notice this problem when ever I've tried to connect Cisco to Nortel.

Thanks for the suggestion I'll try a new cable and see if that helps.
 
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If you have hardcoded both sides to a set speed and duplex you shouldn't have problems . Are you seeing errors on the ports . Sometimes cdp on the cisco switch will give a false reading on this error . Look for errors on either side , if its clean don't worry about the cdp error .
 
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I disagree with vipergg. Set both sides to autonegotiate and I bet you the problem goes away. Let us know what happens.
 
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If you look at both sides and neither side is indicating errors then it is running ok , if the message is bothering you can turn off cdp on that connecting port and it will go away .
 
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The CDP problem won't be an issue unless both sides run CDP, right?
 
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CDP is cisco proprietary for giving information on cisco attached devices on links , seeing that Nortel is not a cisco device it really doesn't matter if its on or off . Don't believe nortel runs cdp , the only other maker I know that does is Hewlitt Packard.
 
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My point is that the CDP message you're referring to is caused by the exchange of link capability information between CDP-capable devices. If one device that uses CDP is set to half duplex and another CDP-capable device is set to full duplex you will get the message from CDP stating that it has detected a duplex mismatch. You won't get that particular message unless both sides participate in CDP.
 
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