9500-32C Breakout 100G to 4x25G

[prafla001]

I'm working with a Catalyst C9500-32C on version 17.1.1. I have a QSFP-4SFP25G-CU5M module in port 2(the port is breakout enabled). Cisco Optics-to-Device Compatibility Matrix shows that QSFP-4SFP25G-CU5M is compatible with C9500-32C on version 17.1.1. However, port 2 status is err-disabled transceiver-incomp.

Is there something that I am missing?

[itengineer]

Regarding the documentation from Cisco, you maybe could go on QSFP-100G-PSM4-S and a MTP Breakout cable.

What is the GBIC / DAC you bought ? from whom ?

[drehstrom]

We're using QSFP-100G-SR4-S bought originally from CISCO. According to the CISCO Optics Compatibility Matrix they are suitable for the switch and they are marked as "Breakout Capable".
The cable itself is not the issue yet, because the port goes to error-disable as soon as it is configured as breakout and the gbic is attached.

Just searched for the suggested PSM4. It seems to be, that they are the similar to the SR4 but using single mode fiber...

This site (https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/whitepaper-c11-744077.html) gives a very good overview - both transceivers are listed to support breakout!

[itengineer]

We didn't buy or test QSFP-100G-SR4-S. 

Official cisco QSFP-4SFP25G-CU3M  and Tier compatible QSFP-4X10G-LR-S is working.

Good luck with TAC.

[drehstrom]

So we got the bad news. The QSFP-100G-SR4-S is not yet supported! Hardware's fine but the software is blocking it for now.
With help, we finally found one hint here. You have to hover over the blue icon and then you'll see this note:

"Breakout mode is not supported". I don't know why CISCO doesn't state this more clearly, but that's the way it is. According to CISCO there will be an update to support these GBICs in the nearer future, since so many customers are asking for this.

I know it's not supported, but did anyone get it going with 3rd-party GBICs? We'd like to put at least some of our hardware into operation for the time being...

[VSlavkov]

Hello guys,

I have a breakout cable JNP-QSFP-AOCBO-10M between Juniper QFX5110 (40G) and Cisco 3850 ( only 2x10G are connected) and it is working. I migrated the Cisco 3850 to Cisco C9500-48Y4C but Cisco 9500 does not recognize the 10G SFPs from 3850 (when the SFP is inserted the log is that the module is NOT_SUPPORTED) and I cannot removed the Cisco 3850.

I read in the datasheet that C9500-48Y4C does not support breakout cables but I am not sure if it is for the 10G SFPs from breakout.

Can anybody help with this?

Thank you!

[William Eckler]

I haven't used breakout cables on my C9500-48Y4C. The only ports I'd normally think to might be the uplink ports on the right side. Can't you just get some 40G optics coded for Juniper on one end and Cisco on the other and hook the switches directly with 40G fiber?
Regards,
Bill