2960 Gig Uplink Connectivity to 1000BaseSX

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Nov 23rd, 2009
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I am trying to trunk a 2960 (on g0/1 and g0/2) to a 6506 and have connected the switches with multimode (50 micron) fiber (LC one end, SC at the other). The 2960 has GLC-SX-MM SFPs and the 6506 has a 6516-GBIC card with 1000BaseSX GBICs.

I don't get link on either end (2960 or 6506) and am wondering if there is a physical mismatch somewhere.

Any help is greatly appreciated.



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LELAND VANDERVORT Mon, 11/23/2009 - 06:33
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We had a similar issue with connections using CWDM interfaces between a 3560 and a 6500..

putting "speed nonegotiate" on the 6500 interface configuration allowed the link to come up.



Reza Sharifi Mon, 11/23/2009 - 09:18
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Hi Rob,

On the 6500 (SC connector) did you flip the fiber strand to see if it comes up?



Leo Laohoo Mon, 11/23/2009 - 13:36
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1.  Make sure the SFP and GBIC are functional.
2.  Is your fibre patch lead Multi-mode as well?
3.  Can you test the fibre patch with a visible light/laser?
4.  The SFP can sometimes loose contact with the appliance, ensure that it's properly inserted.
5.  Make sure the ports are enabled and not shutdown or err-disable.

rdauman24pb Tue, 11/24/2009 - 04:39
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Thanks to everyone who posted a reply.

It turns out the port was err-disabled after all. All is good now.

Thanks again for the help!


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