Forum Discussion

Nimbostratus

May 05, 2023

Forward Error Correction modes supported when deploying at 25G on Cisco 93180

All,

We are looking to deploy a pair of r10600 LTM on the enterprise network at 25G, connecting uplink interfaces to a 93180YC-FX.

In order to connect at 25G on the 93180, we must enable FEC on both ends. The Cisco's default mode FC-FEC CL74, and also supports CONS16-RS-FEC and IEEE-RS-FEC.

Does anyone know what modes of FEC are supported by F5 (rSeries, VELOS, iSeries) for LTM? I only see enabled and AUTO as options, but not what modes are supported.

application delivery

FEC

forward error correction

LTM

rseries

JRahm
May 06, 2023
Hi jdclay, got an authoritative answer on this:

"VELOS and rSeries only support RS FEC IEEE on 25G interfaces. Adjacent network devices must be configured with this FEC mode"

So if you configure the Cisco side as IEEE-RS-FEC you should be good to go.

JRahm
Admin
May 06, 2023
Hi jdclay, got an authoritative answer on this:

"VELOS and rSeries only support RS FEC IEEE on 25G interfaces. Adjacent network devices must be configured with this FEC mode"

So if you configure the Cisco side as IEEE-RS-FEC you should be good to go.
Paulius
MVP
May 05, 2023
jdclay This might be what you're looking for.

https://my.f5.com/manage/s/article/K42021374

You can try setting the Cisco side to auto for FEC to see what it negotiates as or if it is even able to negotiate FEC properly.