X440-G2 10GB Uplink - bad snare if you miss 10GB LIC
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‎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
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
16 REPLIES 16
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‎10-27-2016 04:03 AM
The customer could install a mirror inside the rear door of the rack. This would bring the term "port mirroring" to a new level. Just kidding! 😉
I agree that this would be helpful and from the past I remember that we also once had such kind of a solution. We will discuss this with PLM, but I don't think that we can change the HW design of the existing switches. But for new models this is a valid input.
I agree that this would be helpful and from the past I remember that we also once had such kind of a solution. We will discuss this with PLM, but I don't think that we can change the HW design of the existing switches. But for new models this is a valid input.
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‎10-26-2016 05:36 AM
Hi Drew,
another idea to make this problem more obviously will be that the regarding LED of that port is blinking amber.
Regards
another idea to make this problem more obviously will be that the regarding LED of that port is blinking amber.
Regards
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‎10-26-2016 05:36 AM
I like that idea - I'll share it with the team as well. Thanks.
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‎10-26-2016 02:02 AM
Hi Mattias,
Thanks for your info. Did you ever try to change x670 to 1G and see if the port come UP or not?
Thanks for your info. Did you ever try to change x670 to 1G and see if the port come UP or not?
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‎10-26-2016 02:02 AM
Yes you can run an SFP+ at 1G. You have to manually set the ports on both sides to 1G full duplex in the EXOS CLI:
configure auto off speed 1000 duplex full
I have SFP+'s actively configured on SFP ports in production (awaiting a switch replacement with additional SFP+ ports).
configure auto off speed 1000 duplex full
I have SFP+'s actively configured on SFP ports in production (awaiting a switch replacement with additional SFP+ ports).
