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Error: Breakout maps of 25g-4x and 50g-2x are not supported on 40G transceivers

Last Updated:

Applies to

  • Nexus N9K-C9336C-FX2
  • Reference Configuration File (RCF)


  • After new installation, cluster switch ports are incremting errors: 

$ ssh admin@ "show interface counters errors non-zero"

Port          Align-Err    FCS-Err   Xmit-Err    Rcv-Err  UnderSize OutDiscards
Eth1/7              231          0         78        231          0           0
Eth1/8              292          0         81        292          0           0
Eth1/9              218          0        172        221          0           0
Eth1/10             223          0        165        226          0           0

Port         Single-Col  Multi-Col   Late-Col  Exces-Col  Carri-Sen       Runts

Port          Giants SQETest-Err Deferred-Tx IntMacTx-Er IntMacRx-Er Symbol-Err
Eth1/7           231          --           0          78           0          0
Eth1/8           292          --           0          81           0          0
Eth1/9           221          --           0         172           0          0
Eth1/10          226          --           0         165           0          0

  • Found MTU set to 1500 on cluster switch ports: (example port) 
switch# show int e1/7
Ethernet1/7 is up
admin state is up, Dedicated Interface
  Hardware: 1000/10000/25000/40000/50000/100000 Ethernet, address: b8a3.771c.048
c (bia b8a3.771c.048c)
  MTU 1500 bytes, BW 40000000 Kbit , DLY 10 usec
  reliability 255/255, txload 1/255, rxload 1/255
  • Found that the RCF was not being propoerly applied even after write-erase, reload
`switch# config terminal`
`switch(config)# banner motd #`
`switch(config)# interface breakout module 1 port 1-3 map 10g-4x`
`switch(config)# interface breakout module 1 port 4-6 map 25g-4x`
Error: Breakout maps of 25g-4x and 50g-2x are not supported on 40G transceivers
`switch(config)# interface e1/1/1-4, e1/2/1-4, e1/3/1-4, e1/4/1-4, e1/5/1-4, e1/6/1-4, e1/7-34`
Invalid range at '^' marker.
`switch(config)# inherit port-profile CLUSTER`
  • Errors will continue until the RCF lines are complete:
% Invalid command at '^' marker.
`switch# end`
`switch# end`
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