06-24-2019 12:12 PM
Hi,
I have a C9500-12Q-E that I'm trying to connect to a C2960X-48FPD using GLC-SX-MM's. The 9500 is running 16.9.3 and the 2960 is running 15.2(6)E1. To use the GLC I have the QSFP to SFP converters install (CVR-QSFP-SFP10G) and I know these work because I have a GLC-T in the switch that is working fine.
When I try to connect with the GLC-SX the 9500 says that it's linked and trunked, but the 2960 never shows a link. I've checked the logs and the logs for the 9500 shows Fo1/0/1 up and line protocol up, though CDP never shows the 2960. From the 2960 side, there's nothing in the log that shows it even made and attempt.
Am I missing something? I know both will do 10G, but I have 1G optics that I was hoping to use until I could get them swapped out.
Thanks for any help you can give.
Solved! Go to Solution.
06-28-2019 09:13 AM
Solved!
The solution is to add "speed nonegotiate" to the interface configuration on the 2960X's end. A quick cast to TAC found the solution. I should have caught that and tried it, live and learn.
06-24-2019 12:25 PM
Hi,
I think on the 2960x model you are using, the uplinks are SFP+ only, which means they support 10G only.
HTH
06-24-2019 12:38 PM
06-25-2019 12:41 AM
@rlcole wrote:
I have a C9500-12Q-E
The 9500 is running 16.9.3
I know the reason why: CVR-QSFP-SFP10G and C9500-12Q are not compatible.
Under "Hardware Features Introduced on Cisco Catalyst 9500 Series Switches-High Performance" it is stated that the compatible models for the CVR-QSFP-SFP10G are the following: C9500-48Y4C and C9500-24Y4C
WARNING: 16.10.1 is very, very buggy. Use this version at your own peril. (I am not even recommending this.)
CVR-QSFP-SFP10G is compatible with the C9500-12Q if the switch is running 16.10.1.
You might try loading the switch with 16.11.1 and see if it works.
06-25-2019 06:32 AM
Do you know if this is a change from 16.8.x? The release notes for 16.8 specifically states that it's compatible with the 9500-12Q: Release Notes for Cisco Catalyst 9500 Series Switches, Cisco IOS XE Fuji 16.8.x
I had to move off of 16.8 due to a bug that kept filling up the log with SNMP errors, I'd assumed that since 16.9 is the recommended version that it had all the same HW compatibilities that 16.8 did, I know, probably not a safe assumption.
06-25-2019 08:21 AM
06-25-2019 11:58 AM
Thanks for confirming what I was seeing and thinking in the release notes.
This has got me baffled... because on further testing, the 9500 talks fine to a 3560-8 with a SX SFP in it, but... so does the 2960X. It's really a communications issue between the 9500 and the 2960, when using a GLC-SX. GLC-T works, SFP+ works... Things that make you go hmmmm
06-28-2019 09:13 AM
Solved!
The solution is to add "speed nonegotiate" to the interface configuration on the 2960X's end. A quick cast to TAC found the solution. I should have caught that and tried it, live and learn.
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