[c-nsp] LX vs LH Transceivers

[Justin Krejci]

For the sake of completeness on this thread I was able to use the LH
transceiver just fine after entering the command "speed nonegotiate" on the
interface. 

I will be interested to hear what the provider has to say about this now,
even though prior to making my config change I double checked with them
again on their point about "LX to LH are not compatible" to make sure they
didn't hear "LH to SX" or something like that.

Thanks for the tips everyone.

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Justin Krejci
Sent: Monday, June 15, 2009 7:10 PM
To: 'Dale Shaw'
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] LX vs LH Transceivers

Dale,

Thanks for the tip but this particular case I was using the sfp-only
interface so there is not even an option for configuring media-type.

router(config)#int g5/1
router(config-if)#me?   
% Unrecognized command
router(config-if)#int g5/2
router(config-if)#me?
media-type  

router(config-if)#me


Also I did not try the "speed nonegotiate" option, I will definitely have to
try that.

Thanks!

-----Original Message-----
From: dale.shaw at gmail.com [mailto:dale.shaw at gmail.com] On Behalf Of Dale
Shaw
Sent: Monday, June 15, 2009 6:57 PM
To: Justin Krejci
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] LX vs LH Transceivers

Hi Justin,

On Tue, Jun 16, 2009 at 9:08 AM, Justin Krejci<jkrejci at usinternet.com>
wrote:
> We are running into some performance issues on the 7200 when under load so
> we have a 6509 sup720 3bxl. The sup720 has one sfp port and one sfp/rj45
> combo port. We have one GLC-LH-SM SFP transceiver installed into the
> sfp-only port but when cutting over the above mentioned link from the 7200
> to the 6509 we get no eth link at all.

Sorry if this is offensively obvious, but did your interface config
include "media-type sfp"?

The only other trick I've found with 1000BASE-LX recently was between
a WS-X6724-SFP line card and an Alcatel 1662 -- the link wouldn't come
up without "speed nonegotiate".

Good luck.

Cheers,
Dale

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