Friday, August 31, 2018

3850-48XS with 4x10G Breakout Cable

I've got the all SFP 3850-48XS running IOS-XE 16.3.6.

In my application I wish to use one of these, a Cisco compatible QSFP-4X10G-AOCxM breakout cable:

https://www.fs.com/products/30907.html

The QSFP end will go in an available QSFP port in the 3850 and uplink to various access switches.

So, I have the cable and the 3850 recognizes the cable successfully:

Fo1/1/3 notconnect 1 full 10G QSFP H40G AOCxM SFP

I plugged the SFP+ port labeled #1 into a 2960X and it too successfully recognized the transceiver.

The problem I'm having is configuring the 3850-48XS to use the 10G breakout interfaces TenG1/1/1 - 1/1/16

I tried issuing the following command:

hw-module breakout module 1 port X switch 1

While the switch took this command it didn't deem to make a difference.

I still only see the native TenG ports (1/0/1 - 1/0/48) and the FortyGig ports when checking interface status.

I also see the following error after issuing the "hw-module" command:

*Aug 31 12:16:31.908: %PLATFORM_PM-6-MODULE_REMOVED: SFP module with interface name Fo1/1/3 removed *Aug 31 12:16:34.604: %PLATFORM_PM-6-MODULE_INSERTED: SFP module inserted with interface name Fo1/1/3 *Aug 31 12:16:34.606: %PLATFORM_PM-6-DIFFERENT_MODULE_INSERTED: Warning: SFP module inserted in to the interface Fo1/1/3 differs from the previously inserted one. The port's speed configuration will be set to the default.

Does anyone know what the trick is to making this cable work in this switch?



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