Cisco MDS 9000 Series Configuration Manual page 169

Congestion Detection, Avoidance, and Isolation
Show Clock
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2018-08-28 15:43:33
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Module: 1 datarate
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- DATARATE INFORMATION FROM FCMAC
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| Interface | Speed
|
----------------------------------------------------------------------------------
| fc1/94 | 4G
|
| fc1/94 | 4G
|
| fc1/94 | 4G
|
| fc1/94 | 4G
|
• Display of Tx and Rx transitions to zero (Fibre Channel only)—When a port approaches or reaches
zero remaining credits in either direction, the transitions to zero counter is incremented. This
incrementation of the counter indicates that a port is running out of credits, but does not indicate
the duration that the port was at zero credits. The port could have been at zero credits momentarily
or for a longer time. TxWait provides a better view of the impact of credits running out because it
gives the actual duration that the port was at 0 Tx credits remaining. Transitions to zero are shown
in the show interface counters and show interface counters detailed commands.
The following example displays the transition to zero status of the transmit and receive credits:
switch# show interface fc1/1 counters | i fc | transitions
fc1/1
0 Transmit B2B credit transitions to zero
0 Receive B2B credit transitions to zero
• Priority-flow-control pauses (FCoE only)—Provides a count of PFC pause frames that are sent and
received on an interface. PFC pause is a count and includes both PFC pauses with a nonzero quanta
(actual pause frames) and PFC pauses with a zero quanta (resume frames). This count does not give
any indication of the amount of time the port is paused. The port could have been at zero credits
momentarily or for a longer time. TxWait and RxWait give a better view of the impact of these
pause frames because they provide the actual amount of time the port was paused in each direction.
PFC pauses can be displayed via the show interface and show interface priority-flow-control
commands.
The following example displays the transition to zero status of the transmit and receive credits:
switch# show interface eth3/1
Ethernet3/1 is up
admin state is up, Dedicated Interface
Belongs to Epo540
...snip
RX
555195 unicast packets 105457 multicast packets 0 broadcast packets
...snip
230870335 Rx pause
| Alarm-types |
| TX_DATARATE_FALLING |
| TX_DATARATE_RISING |
| TX_DATARATE_FALLING |
| TX_DATARATE_RISING |
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
Information About Congestion Detection
Rate | Timestamp
57% | Tue Aug 28 15:42:52 2018
86% | Tue Aug 28 15:38:54 2018
8% | Tue Aug 28 15:38:33 2018
85% | Tue Aug 28 15:37:42 2018
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