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Auto Negotiation on 3800 router Gig Interface

nadeem-akhtar
Level 1
Level 1

‎05-11-2010 12:47 PM - edited ‎03-04-2019 08:27 AM

I can turn off auto negotiation on a fiber/Gig interface on a 3825 router by the command:

no negotiation auto

What does this buy me as in any case it will be full / 1000? What kind of (negotiation) traffic should I see with negotiation turned on on the router?

I'm troubleshooting an issue where the link between a 3825 router and a 6509 switch works fine with negotiation on on router and turned off on switch. When I put an IPS in line between the router and switch, link fails. IPS is configured with negotiation off.

Thanks

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Calin C.
Level 5
Level 5

‎05-12-2010 12:01 AM

Just an idea, did you tried to hardcode the duplex and speed on both ends (3800 and IPS)

to see if like this is working.

Sometimes I had problems with auto negotiation without any other solution that configuring speed and duplex manually.

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