Symptom
The port-channel counters do not reflect the Percentage Tx credits not available, so administrators need to look at the port-channel members to find that information. The statistics are reported for the physical ports, but that specific counter only reports 0 (zero) at the port-channel level.
Example:
MDS9706-1# show inter fc5/5-6 counters | inc fc|Percentage|rate
fc5/5
5 minutes input rate 17554624 bits/sec, 2194328 bytes/sec, 997 frames/sec
5 minutes output rate 8779392 bits/sec, 1097424 bytes/sec, 495 frames/sec
Percentage Tx credits not available for last 1s/1m/1h/72h: 99%/99%/0%/0% <--- here
fc5/6
5 minutes input rate 0 bits/sec, 0 bytes/sec, 0 frames/sec
5 minutes output rate 8777152 bits/sec, 1097144 bytes/sec, 494 frames/sec
Percentage Tx credits not available for last 1s/1m/1h/72h: 99%/99%/0%/0% <--- here
MDS9706-1# sh int port-channel 111 counters
port-channel111
5 minutes input rate 17532800 bits/sec, 2191600 bytes/sec, 997 frames/sec
5 minutes output rate 17529600 bits/sec, 2191200 bytes/sec, 985 frames/sec
35851878509 frames input, 77009829011004 bytes
0 discards, 0 errors, 0 CRC/FCS
0 unknown class, 0 too long, 0 too short
35831669686 frames output, 76966421801044 bytes
0 discards, 0 errors
0 timeout discards, 0 credit loss
8 input OLS, 4 LRR, 0 NOS, 0 loop inits
4 output OLS, 0 LRR, 6 NOS, 0 loop inits
2 link failures, 2 sync losses, 0 signal losses
992788 Transmit B2B credit transitions to zero
1933743 Receive B2B credit transitions to zero
2888011776 2.5us TxWait due to lack of transmit credits
Percentage Tx credits not available for last 1s/1m/1h/72h: 0%/0%/0%/0% <--- here
Conditions
This issue was initially reported on an MDS 9706 running 6.2(17).
Workaround
Check the statistics for Percentage Tx credits not available on the physical ports that are part of the specific port-channel.
