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

["Scott Berkman" <scott () sberkman net>]

I actually have seen where you have to hard set to speed 1000 to get this
type of link up, even Cisco to Cisco.

        -Scott

-----Original Message-----
From: Michael K. Smith - Adhost [mailto:mksmith () adhost com] 
Sent: Tuesday, November 24, 2009 11:25 AM
To: Michael Ruiz; nanog () nanog org
Subject: RE: <Help --> Having trouble trying to activate a GigE connection>

Hello Michael:

> -----Original Message-----
> From: Michael Ruiz [mailto:mruiz () telwestservices com]
> Sent: Tuesday, November 24, 2009 8:02 AM
> To: nanog () 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