Catalyst 9500, 10GBASE-SR, FEC

[clma]

Hello Experts,

I am looking to enable FEC on a 10G fiber link using Cisco 10GBASE-SR SFP+ transceiver and Cisco Catalyst 9500 switch.  Is it possible to use FEC in this configuration? What commands to I need to issue to the switch to enable FEC?  Thank You.

[Flavio Miranda]

Hi

The command is as follow:

switch(config-if-range)# fec {auto | cl91 | off}
• auto—Enables the FEC feature based on the transceiver type.
• cl91—Enables clause 91 for 100 Gigabit interface.
• off—Disables FEC for the interface range.

But, if you look at the Data sheet, you are not going to find it:

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9500-series-switches/nb-06-cat9500-ser-data-sheet-cte-en.html 

Although on this link, they mention FEC for 9500.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwj3zafZqOf3AhVIsJUCHbhCCtYQFnoECAcQAQ&url=https%3A%2F%2Fwww.ciscolive.com%2Fc%2Fdam%2Fr%2Fciscolive%2Fus%2Fdocs%2F2018%2Fpdf%2FBRKARC-2007.pdf&usg=AOvVaw3PNRKhzSh... 

[clma]

Flavio,

Thanks for the reply.  I have not been able to try this yet but I have some questions you may know the answer to.

Regarding this:

switch(config-if-range)# fec {auto | cl91 | off}
• auto—Enables the FEC feature based on the transceiver type.
• cl91—Enables clause 91 for 100 Gigabit interface.
• off—Disables FEC for the interface range.

What type of FEC is supported?  (RSFEC, etc.) 

What determines the FEC mode used when set to Auto?

Thank You.