Inter switch trunking

Unanswered Question
Mar 29th, 2007
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Got 2 switches connected together as follows

port f0/26 on a cisco WS-C2950C-24 to port g0/48 on a cisco WS-C2960G-48TC-L


They are auto sensing speed and duplex and I cannot find a command to tie them down.

The problem is that WS-C2950C-24 is auto sensing the duplex as full and WS-C2960G-48TC-L is auto sensing the duplex as half

I have coppied the show ver, show int and the interface config from both switches in a notepad attachment


I hope someone can help me with this



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Amit Singh Thu, 03/29/2007 - 03:23
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Chris,


Can you please let us know the GBIC module you are using on 2960G Switch. Your 2950 switch port is 100 base FX and I think you also have a GBIC on 2960G as well.


-amit singh



Amit Singh Mon, 04/02/2007 - 03:38
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  • Cisco Employee,

Hello Chris,


It looks like the SFP on 2960 port doesnot support "auto-negotiation" and falling back on half-duplex. Please try configuring the duplex as full under the SFP interface configuration.


Config t

Switch(config)#Interface ge x/y

Switch(config-if)#media-type sfp

Switch(config-if)#duplex full


http://www.cisco.com/en/US/products/ps6406/products_configuration_guide_chapter09186a0080511fcc.html#wp1080632


This should take care of the problem.


HTH,Please rate if it does.


-amit singh

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