Errors on Gig interfaces

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Dec 9th, 2007
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Hi All


I have a scenario where I have a 3 storey building. On each floor there are 3 switches. Each switch has 2 gig interfaces used as uplinks.


The switches are connected in such a way that some of the gig interfaces are running half duplex. Because of the half duplex settings we are seeing errors on the interfaces.


Can someone please assist by advising how to get the interfaces to run at full duplex?


Thanks

willemvw

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chris_tan Sun, 12/09/2007 - 23:31
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Hi,


If I remember correctly,Gigabit interface cannot configure the duplex setting. Please verify. What is the model of these switch?


Rgds,

Christopher

willemvwyk Sun, 12/09/2007 - 23:50
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Hi Christopher


You are correct by saying the gig interface duplex settings cannot be set. However there are some switches which have for instance gig0/1 interface half duplex and gig 0/2 interface full duplex. From what I understand this set up is from the way the interfaces are connected.


The switches are WS-C2950G-48-EI.

chris_tan Sun, 12/09/2007 - 23:58
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Hi,


Are those interface configured as auto/auto setting? or there is a command to force it to half-duplex? You will need to change both site to have similar setting.


Rgds,

Christopher

chris_tan Mon, 12/10/2007 - 00:13
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Hi,


Are those interface configured as auto/auto setting? or there is a command to force it to half-duplex? You will need to change both site to have similar setting.


Rgds,

Christopher

lgijssel Mon, 12/10/2007 - 00:36
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You likely have interconnected these switches using GigaStack modules. When there are only two of these on a link, the connection will be full duplex. As soon as a third device is added, the whole stack will default to half duplex.

http://www.cisco.com/en/US/products/hw/modules/ps872/products_module_installation_guide_chapter09186a008007d1ef.html#xtocid4


regards,

Leo

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