Symptom
The N9K always displays 0 for 'Transmit B2B credit transitions to zero' in the show interface command. This is misleading since there is no HW counter for it. This should say 'NA' or 'Not Supported' or some such.
fc1/45
5 minutes input rate 0 bits/sec, 0 bytes/sec, 0 frames/sec
5 minutes output rate 0 bits/sec, 0 bytes/sec, 0 frames/sec
0 frames input, 0 bytes
0 class-2 frames, 0 bytes
0 class-3 frames, 0 bytes
0 class-f frames, 0 bytes
0 discards, 0 errors, 0 CRC/FCS
0 unknown class, 0 too long, 0 too short
0 frames output, 0 bytes
0 class-2 frames, 0 bytes
0 class-3 frames, 0 bytes
0 class-f frames, 0 bytes
0 discards, 0 errors
0 timeout discards, 0 credit loss
0 input OLS, 0 LRR, 0 NOS, 0 loop inits
0 output OLS, 0 LRR, 0 NOS, 0 loop inits
0 link failures, 0 sync losses, 0 signal losses
0 Transmit B2B credit transitions to zero <<< There is no HW counter for this
0 transmit B2B credit remaining
0 low priority transmit B2B credit remaining
Last clearing of "show interface" counters : :never
Conditions
All utilizing Fibre Channel(FC) interfaces on any Nexus 9000
Further Problem Description
Related bugs:
CSCwa07144 UCS Show 'Tx/Rx B2B credit transitions to zero' as 'NA' in 'show interface counters' for FC intfs
CSCwa08210 N9K Show 'FCP_CNTR_RX_WT_AVG_B2B_ZERO' as 'NA' in 'show hardware internal fc-mac statistics'
CSCwa08226 UCS Show 'FCP_CNTR_RX_WT_AVG_B2B_ZERO' as 'NA' in 'show hardware internal fc-mac statistics'
Resolution Summary
To be determined when resolved.
