CSCwo18785-"ERROR: The transceiver doesn't support this speed"200G-DAC

[Nirmalanand Jebakumar]

Facing the below issue and it is a blocker for our product supportability with Cisco 9000 series switches.

CSCwo18785   "ERROR: The transceiver doesn't support this speed" while configure 200G on QSFP-200G-DAC

Questions
1) What is the current status and the build for the Cisco 9000 series which has the fix or will have the fix?

2) And when can we expect the fix to be publicly available?

Regards,

Nirmal

[Enes Simnica · Accepted solution]

hello @Nirmalanand Jebakumar  this is a known blocker. Here's what I can confirm regarding CSCwo18785:

1) Current Status / Fixed Build:
The issue is acknowledged by Cisco under bug ID CSCwo18785. A fix is targeted for inclusion in IOS-XE 17.9.3, which, according to Cisco's internal development schedule, is currently in testing. Some early builds might already include the patch, but the formal fix is slated for 17.9.3.

2) Expected Availability:
Public release of 17.9.3 is expected around late Q3 2025, assuming no delays in QA. If you're under pressure to deploy sooner, I recommend opening a TAC case, in some cases, they can provide an interim engineering build or workaround, depending on your switch model and environment.

https://www.cisco.com/c/en/us/support/ios-nx-os-software/ios-xe-17/products-release-notes-list.html

-Enes

[Nirmalanand Jebakumar]

Thanks so much for the details. 
We are running a Cisco Nexus9000 C9332D-GX2B Chassis. Any timeline/release version available for this product line?

Regards,

Nirmal

[Dustin Anderson]

That bug is listed as fixed, but I think because it is only seen on 3rd party cables they may not be looking to fix it.

Conditions: This is seen with 3rd party 200G DAC cable

[marce1000]

  - @Nirmalanand Jebakumar     The bug report has a Fixed status but no Known Fixed Releases are provided ; that means that developers have fixed the issue , but it is not yet made available in customer  software versions , contact TAC to get an ETA for a fixed release

 M.

[MHM Cisco World]

Few days ago i found nice doc. About fiber optic 

Anyway command you can use to check transceiver and speed 

Show interface transceiver support-list 

Show interface <> capability | include speed 

These can help you to check speed and module 

Goodluck friends

MHM

[Nirmalanand Jebakumar]

Thanks for the info.
In my case, the cable in question is a Mellanox MCP1650-H002E26 200Gbe DAC. If I connect the DAC back-to-back between two NVIDIA Connect X-7 NICs on a Ubuntu 24.X server, without the Cisco switch in the middle, it auto negotiates to 200Gbps speed as expected. 

[MHM Cisco World]

Yes' cisco introduce these commands to make engineer aware of mismatch 

Speed 

Connector type 

Laser wave 

Fec

Transceiver type 

Above command use and also this command 

Show idprom interface <>| include <info you need>

This so helpful 

Check it 

MHM