Symptom
On a Nexus 9000 the input error counter does not increase even though there are CRCs reported:
switch # show int ethernet 2/3 | egrep Eth|RX|TX|err|jumb|CRC | egrep -v Hard|Type
Ethernet2/3 is up
RX
10 jumbo packets 0 storm suppression packets
0 runts 0 giants 10 CRC 0 no buffer <<<<------------------- RX CRC
0 input error 0 short frame 0 overrun 0 underrun 0 ignored <<<<--- No input error count increasing
TX
0 jumbo packets
0 output error 0 collision 0 deferred 0 late collision
Also, Rcv-Err remains at zero:
switch # sh int eth 2/3 counters errors
--------------------------------------------------------------------------------
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards
--------------------------------------------------------------------------------
Eth2/3 0 10 0 0 0 0
--------------------------------------------------------------------------------
Port Single-Col Multi-Col Late-Col Exces-Col Carri-Sen Runts
--------------------------------------------------------------------------------
Eth2/3 0 0 0 0 0 0
--------------------------------------------------------------------------------
Port Giants SQETest-Err Deferred-Tx IntMacTx-Er IntMacRx-Er Symbol-Err
--------------------------------------------------------------------------------
Eth2/3 0 -- 0 0 0 0
9396-VTEP-A-vPC#
Conditions
CRCs coming into a 40G port
Further Problem Description
The 40G port is part of the Northstar asic from Cisco and the 10G ports are part of the T2 asic from broadcom.
