Forward Error Correction checks and recovers potential errors during long-range data transmission.
Forward Error Correction checks and recovers potential errors during long-range data transmission. Because the Cisco Catalyst 8500L Edge Platforms have long-range SFP, FEC must be configured.
Follow these steps to configure Forward Error Correction:
Procedure
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enable source-interface gigabitethernet slot/port
Enables the privileged EXEC mode. If prompted, enter your password.
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configure terminal
Example:
Router# configure terminal
Enters the global configuration mode.
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interface twentyfivegigabitethernet slot/port
Example:
Router(config)# interface twentyfivegigabitethernet0/0/164/11
Specifies the 25-gigabit Ethernet interface to be configured.
Here:
slot/port specifies the location of the interface.
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fec { auto | cl108 | cl74 | off}
Example:
Router(config)# fec cl74-fc
Configuring fec cl74 enables Clause 74 FC-FEC on the interface, which helps correct errors in the data stream to maintain signal integrity and performance.
The fec command supports these modes:
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auto—Enables FEC based on SFP type
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cl108—Enables clause108 <= RS-FEC(528,514)
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cl74—Enables clause74 <= FC-FEC
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disable—Disables FEC on interface
Note
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The fec command is only applicable to 25G links.
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For 10- or 25-Gbps dual-rate SFP modules, if the speed changes from 25 Gbps to 10 Gbps, remove the fec configuration before changing the speed.
What to do next
Minimum supported release: Cisco IOS-XE Release 26.2
You can verify the FEC type from the show interface command only for 100G interfaces.