fec

Configures the FEC mode.

Syntax

fec [ fc-fec | rs-fec | auto-negotiation | disabled ]

Parameters

fc-fec: Configures FC-FEC in manual mode.
rs-fec: Configures RS-FEC in manual mode.
auto-negotiation: Configures FEC auto negotiation.
disabled: Disables FEC.

Modes

Interface config mode

Usage Guidelines

This command is available only to users with admin role.

This command is supported only on ports with 100G or 25G speed.

Interface cannot be a part of the port-channel.

Table 1. Error messages
Message	Reason
`Error: FEC configuration is not allowed. Disable interface before changing the FEC configuration.`	Interface must be disabled (admin shutdown) before changing FEC configuration.
`Error: Speed configuration not allowed when FEC is configured`	Port speed cannot be changed if FEC is configured

Examples

The following examples show FEC configuration.

device(config)# int e 4/16 
device(config-if-eth-4/16)# fec fc-fec 
device(config-if-eth-4/16)# fec fc-fec 
Error: FEC configuration is not allowed. Disable interface before changing the FEC configuration.
 
device(config)# int e 4/16
device(config-if-eth-4/16)# channel-group 111 mode on
device(config-if-eth-4/16)# fec rs-fec 
Error: FEC configuration is not allowed on interface that is part of a port-channel 

device(config-if-eth-4/16)# speed 40000  
Error: Speed configuration not allowed when FEC is configured
device(config-if-eth-4/16)#

device# show int e 4/16 
ethernet 4/16 Admin state DOWN    Operational state DOWN     
 Interface index is 268435744 (0x10000120)  
 MTU 0 bytes  
 Hardware is Ethernet  mac address 40:88:2f:c1:02:43 
Current Speed  100G 
FEC Mode: RS-FEC 

Statistics  
 Carrier Transitions: 0 
           LastClear: 0s 
Input: 
          Broadcast Pkts: 0 
            Discard Pkts: 0 
             Errors Pkts: 0 
              FCS Errors: 0 
              MCast Pkts: 0 
                  Octets: 0 
              UCast Pkts: 0 
       Unknown Protocols: 0 
Out: 
          Broadcast Pkts: 0 
            Discard Pkts: 0 
             Errors Pkts: 0 
              MCast Pkts: 0 
                  Octets: 0 
              UCast Pkts: 0