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Port metrics

Asset page performance charts display port metrics when the asset is associated with a port or when a port is added as a resource. Port metrics are useful when monitoring and troubleshooting your Fibre Channel environment, providing BB credit metrics and the type of port error (for example, link failures and Class 3 discards).

The following table lists the port metrics available in Insight and the Brocade and Cisco counters from which they are derived:
Insight Port Metrics Brocade SNMP Counter Cisco SNMP Counter
BB credit 0 -Tx
Tx BB credit transitions to zero
connUnitPortStatCountBBCreditZero
The count of transitions in to and out of BB credit zero state. The other side is not providing any credit.
fcHCIfBBCreditTransistionFromZero
Increments if the transmit buffer­to­buffer credit is zero.
BB credit 0 - Rx
Rx BB credit transitions to zero
connUnitPortStatCountInputBuffersFull
The count of occurrences when all input buffers of a port were full and outbound BB credit transitioned to zero. There is no credit to provide to other side.
fcHCIfBBCreditTransistionToZero
Increments if the receive buffer­to­buffer credit is zero.
BB credit zero duration - Tx
Time in milliseconds during which Tx BB credit was zero during the sample interval
connUnitPortStatCountBBCreditZero
An increment of this counter means that the frames could not be sent to the attached device for 2.5 µs because of zero Tx BB credit.
fcIfTxWtAvgBBCreditTransitionToZero
Increments if the credit available is zero for 100 ms.
Timeout discard frames - Tx
Discarded Tx frames caused by timeout
swConnUnitC3DiscardDueToTXTimeout
Number of Class 3 transmit frames discarded due to timeout
fcIfTimeOutDiscards
Frames discarded because a timeout occurred within the switch
CRC errors
CRC error count
fcIfInvalidCrcs
The number of invalid CRCs detected by the FC-Port
connUnitPortStatCountInvalidCRC
The number of frames received with invalid CRC
Link resets - Tx
Tx Link Reset count
connUnitPortStatCountTxLinkResets
Count of link resets. This is the number LRs transmitted.
fcIfLinkResetOuts
The number of link reset protocol errors issued by the FC­Port to the attached FC­Port
Link resets - Rx
Rx Link Reset count
connUnitPortStatCountRxLinkResets
Count of link resets. This is the number of LRs received.
fcIfLinkResetIns
The number of link reset protocol errors received from the attached FC­port
Link failures
Link failure count
connUnitPortStatCountLinkFailures
Count of link failures. This count is part of the LESB.
fcIfLinkFailures
The number of link failures detected by the FC­Port
Traffic - Tx
Tx data rate in MB/s
connUnitPortStatCountTxElements
The number of bytes that have been transmitted by this port
fcIfC3OutOctets , fcIfCfOutOctets
The number of Class 3 frame octets, including the frame delimiters, transmitted by this port
Traffic - Rx
Rx data rate in MB/s
connUnitPortStatCountRxElements
The number of octets or bytes that have been received by this port
fcIfC3InOctets , fcIfCfInOctets
The number of Class 3 frame octets, including the frame delimiters, received by this port
Frame rate - Tx
Tx frame rate in fps
connUnitPortStatCountTxObjects
The number of frames, packets, I/O instances, and so on transmitted by this port
fcIfC3OutFrames, fcIfCfOutFrames
The number of frames, packets, I/O instances, and so on transmitted by this port
Frame rate - Rx
Rx frame rate in fps
connUnitPortStatCountRxObjects
The number of frames, packets, I/O instances, and so on received by this port
fcIfC3InFrames, fcIfCfInFrames
The number of frames, packets, I/O instances, and so on received by this port
Frame size average - Tx
Avg Tx frame size in B
traffic.txRate * 2²º / traffic.txFrameRate
The ratio of transmitted traffic to transmitted frame rate
traffic.txRate * 2²º / traffic.txFrameRate
The ratio of transmitted traffic to transmitted frame rate
Frame size average - Rx
Avg Rx frame size in B
traffic.rxRate * 2²º / traffic.rxFrameRate
The ratio of received traffic to received frame rate
traffic.rxRate * 2²º / traffic.rxFrameRate
The ratio of received traffic to received frame rate