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X440-G2 10GB Uplink - bad snare if you miss 10GB LIC

X440-G2 10GB Uplink - bad snare if you miss 10GB LIC

M_Nees
Contributor III

‎10-25-2016 05:40 PM

Today we have a very painful and time-killing problem. Be careful NOT to run into the same issue.

We using X440-G2 with 10GB GBICs on the Uplink ports (51-52 - with Dual 10GB LIC) linked to 2x X670-G2 also with 10GB GBICs.
Some of my collegues configured the X440-G2 BUT do NOT install the 10GB License.

If you connect that Switch to the CORE you does not get a link. But light comes out of the fibre cable and seemed to be OK. If you check transceiver information on CORE switch you can see that you have excellent signal - but the link on the CORE Switch does not come up! Damn!

If you have a look at the X440-G2 the log tells you that the 10GB Port have a 10GB GBIC but you do NOT have a 10GB license, so the speed is reduced to 1GB!
Does this make sense ?

The result is that the 10GBIC sending out a signal but a 10GB GBIC cannot never run in 1GB mode. So there will never ever be a link. Talking with some other network guys telling me that a very usual mistake a lot of people running into this pitfall.

From my point of view it was better if the developers disable the 10GB GBIC completely to avoid such tricky problems!

Regards,
Matthias
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17 REPLIES 17

James_A
Valued Contributor
In response to Curtis_Brabham

‎01-07-2022 01:14 PM

This one caught me out today, I put in a new switch but used the old 1Gb SFPs in the rear ports. They would get link at the other end (a VSP7400) but not on the X440-G2. I spent an hour on it before I gave up and used a front panel port, then this evening did some googling and found this thread, and "configure auto off speed 1000 duplex full" did the job.

If PLM is still listening could they make the auto speed 1000 when unlicensed?
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M_Nees
Contributor III
In response to Edward_Tsui

‎10-26-2016 02:02 AM

Hi Edward,
it is not possible to run a 10GB GBIC in 1GB mode. That not possible from the GBIC side and prohiboted on the EXOS CLI.

Regards
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Drew_C
Valued Contributor III

‎10-25-2016 10:12 PM

Hi Matthias,
Thanks for bringing this to our attention. Your post has been shared with engineering and PLM and is making the rounds for how best to fix this. Myself or someone else on the team will keep you updated.

Thanks,
-Drew
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GTM-P2G8KFN