<Help --> Having trouble trying to activate a GigE connection>

Peter Sandström peter at stardoll.com
Wed Nov 25 12:39:23 CST 2009


I have seen this behavior caused by a mismatch of SFPs, SX on one side
and LX on the other.

/p

On Tue, Nov 24, 2009 at 9:04 AM, Michael Ruiz <mruiz at telwestservices.com> wrote:
>>I don't think there is any reason to have hard-set speed and duplex,
>>particularly between two Cisco's.  Why not just set *both* sides (you
>>can't set just one) to auto-negotation - 'no speed nonegotiate' on the
>>7606 side.  Is this a straight shot, single fiber pair between the two
>>or are there intermediate junctions or optics?  It sounds like you have
>>questionable fiber or optics in the path.  It could be the fiber itself
>>or the GBICs on either side.
>
> Mike,
>
>        I tried setting the 7206 to auto, and the 7606 to nonnegtiate,
> however, no dice.  We put light meter on both ends of the GBIC and light
> readings are at -20, which are applicable. Between the two routers are
> MMF and it is straight shot with no transport equipment in between.
>
> -----Original Message-----
> From: Michael K. Smith - Adhost [mailto:mksmith at adhost.com]
> Sent: Tuesday, November 24, 2009 10:25 AM
> To: Michael Ruiz; nanog at nanog.org
> Subject: RE: <Help --> Having trouble trying to activate a GigE
> connection>
>
> Hello Michael:
>
>> -----Original Message-----
>> From: Michael Ruiz [mailto:mruiz at telwestservices.com]
>> Sent: Tuesday, November 24, 2009 8:02 AM
>> To: nanog at nanog.org
>> Subject: <Help --> Having trouble trying to activate a GigE
> connection>
>>
>> Group,
>>
>>
>>
>>                 I am having an issue with activating a Gige interface
>> between a Cisco 7206 VXR w/IO-1GE module to a 7606 w/sup720-3bxls
>> connecting to a line module WS-X6416-GBIC.  I have verified that the
>> GBIC-MMF have good light reading and the MMF fiber jumper are not
>> reversed.  The GigE connection comes up briefly for about a few
>> seconds,
>> takes a burst of errors and goes down.  I have tried to set the speed
>> to
>> nonegotiate on both ends, set one end to speed auto.  No dice.  Here
> is
>> the copy of the configuration.  On my 7606 I show that the GigE
>> interface is up/up but on the 7206vxr I show down/down.  Any help will
>> be greatly appreciated.  Thanks!
>>
>>
>>
> I don't think there is any reason to have hard-set speed and duplex,
> particularly between two Cisco's.  Why not just set *both* sides (you
> can't set just one) to auto-negotation - 'no speed nonegotiate' on the
> 7606 side.  Is this a straight shot, single fiber pair between the two
> or are there intermediate junctions or optics?  It sounds like you have
> questionable fiber or optics in the path.  It could be the fiber itself
> or the GBICs on either side.
>
> Regards,
>
> Mike
>
>



-- 
Peter Sandström
Head of Operations, Stardoll AB
phone: +46 (0)70 456 05 28
e-mail: peter at stardoll.com | stardoll: pj0tr
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