CISCO-PFC-EXT-MIB

All MIBs › CISCO-PFC-EXT-MIB

Organization: Cisco Systems, Inc.

Last Updated: 2017-05-26

Category: Cisco Devices, Quality of Service

Description: Extends Priority Flow Control (PFC) management for DCB and FCoE traffic on Cisco data center switches.

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What Is CISCO-PFC-EXT-MIB?

This Cisco vendor MIB extends management of Priority-based Flow Control (PFC), part of Data Center Bridging used to provide lossless Ethernet transport for FCoE and similar traffic on Cisco data-center switches (e.g., Nexus platforms). It exposes per-interface PFC request/indication counters, per-priority-class PFC statistics, and a PFC watchdog queue-monitoring table. Its monitoring role covers software/hardware traffic-control status: how often PFC pause frames are requested or received per interface and per CoS priority class, and watchdog detection of queues stuck in a paused state, both of which reveal congestion or misbehaving devices threatening lossless traffic. It complements the IEEE 802.1Qbb PFC standard and Cisco's broader QoS/queueing MIBs, and explicitly deprecates an older compliance statement in favor of a newer one. It is deployed on Cisco data-center switches running FCoE or other lossless Ethernet fabrics requiring priority flow control. Engineers can download the CISCO-PFC-EXT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-PFC-EXT-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Cisco Nexus / data-center switch supporting DCB/FCoE

Monitoring Examples

An operator polls cpfcIfTable/cpfcIfEntry for per-interface cpfcIfRequests and cpfcIfIndications to see how often PFC pause requests are sent or received, and drills into cpfcIfPriorityTable's cpfcIfPriorityValue rows for per-CoS-class PriorityRequests/PriorityIndications — a priority class with an unusually high indication count suggests persistent congestion on that traffic class (e.g. FCoE). The cpfcWatchdogIfQueueInfoTable, keyed by cpfcWatchdogIfQueueNumber, flags queues stuck in a PFC-paused state long enough to trigger the watchdog, typically indicating a downstream device failing to drain traffic.

What Can Be Monitored

PFC pause requests/indications per interface
PFC requests/indications per priority class
PFC watchdog queue status
priority-to-queue mapping

Imported Objects

From CISCO-QOS-TC-MIB

QosQueueNumber

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From CISCO-TC

Unsigned64

From HCNUM-TC

CounterBasedGauge64

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter64
Integer32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using cpfcIfRequests OID:

Select a Cisco Nexus / data-center switch supporting DCB/FCoE as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type cpfcIfRequests into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. It reports a count of the invoked PFC M_CONTROL.request primitives for a particular interface. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter64-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoPfcExtMIB	1.3.6.1.4.1.9.9.813			This MIB module defines management objects for monitoring information of Priority-based Flow Control. Deprecated ciscoPfcExtMIBCompliance2, which is replaced by ciscoPfcExtMIBCompliance3. The following terms are used throughout the MIB: PFC: Priority Flow Control
ciscoPfcExtMIBNotifs	1.3.6.1.4.1.9.9.813.0
ciscoPfcExtMIBObjects	1.3.6.1.4.1.9.9.813.1
cpfcIfTable	1.3.6.1.4.1.9.9.813.1.1		not-accessible	A list of PFC informaton for each interface in the system capable of providing such information.
cpfcIfEntry	1.3.6.1.4.1.9.9.813.1.1.1		not-accessible	Each entry contains the PFC statistics information of the interface.
C64 cpfcIfRequestsEx	1.3.6.1.4.1.9.9.813.1.1.1.1	Counter64	read-only	A count of the invoked PFC M_CONTROL.request primitives for a particular interface.
C64 cpfcIfIndications	1.3.6.1.4.1.9.9.813.1.1.1.2	Counter64	read-only	A count of the received PFC M_CONTROL.indication primitives for a particular interface.
cpfcIfPriorityTable	1.3.6.1.4.1.9.9.813.1.2		not-accessible	A list of PFC informaton for each PFC priority of each interface in the system capable of providing such information.
cpfcIfPriorityEntry	1.3.6.1.4.1.9.9.813.1.2.1		not-accessible	Each entry contains the PFC statistics information for a PFC priority of the interface.
I32 cpfcIfPriorityValue	1.3.6.1.4.1.9.9.813.1.2.1.1	Integer32	not-accessible	This object indicates the priority value of the PFC capable interface.
C64 cpfcIfPriorityRequests	1.3.6.1.4.1.9.9.813.1.2.1.2	Counter64	read-only	A count of invoked request premitives for a specific PFC priority of a particular interface.
C64 cpfcIfPriorityIndications	1.3.6.1.4.1.9.9.813.1.2.1.3	Counter64	read-only	A count of the received indication primitives for a specific PFC priority of a particular interface.
cpfcWatchdogIfQueueInfoTable	1.3.6.1.4.1.9.9.813.1.3		not-accessible	This table provides PFC Watchdog Timer related information for each queue of each watchdog timer capable interface.
cpfcWatchdogIfQueueInfoEntry	1.3.6.1.4.1.9.9.813.1.3.1		not-accessible	Each entry contains the PFC Watchdog Time information, which are per interface and per queue.
QOS cpfcWatchdogIfQueueNumber	1.3.6.1.4.1.9.9.813.1.3.1.1	QosQueueNumber	not-accessible	This object indicates the queue number of the interface.
INT cpfcWatchdogIfQueueState	1.3.6.1.4.1.9.9.813.1.3.1.2	INTEGER	read-only	This object indicates the state of the PFC queue for the interface.
C64 cpfcWatchdogIfQueueShutdowns	1.3.6.1.4.1.9.9.813.1.3.1.3	Counter64	read-only	This object indicates the number of times a given PFC queue was shutdown for the interface.
C64 cpfcWatchdogIfQueueRestores	1.3.6.1.4.1.9.9.813.1.3.1.4	Counter64	read-only	This object indicates the number of times a given Priority Flow Control queue was restored for the interface.
C64 cpfcWatchdogIfQueueTotalDropPkts	1.3.6.1.4.1.9.9.813.1.3.1.5	Counter64	read-only	This object indicates total number of packets that were dropped due to corrective action for a given PFC queue of the interface.
NUM cpfcWatchdogIfQueueDropPkts	1.3.6.1.4.1.9.9.813.1.3.1.6	CounterBasedGauge64	read-only	This object indicates total number of packets that have been dropped due to corrective action since last shutdown action for a given PFC queue of the interface.
NUM cpfcWatchdogIfQueueDropInPkts	1.3.6.1.4.1.9.9.813.1.3.1.7	CounterBasedGauge64	read-only	This object indicates total number of ingress packets that have been dropped due to corrective action since last shutdown action for a given PFC queue of the interface.
NUM cpfcWatchdogIfQueueTotalDropInPkts	1.3.6.1.4.1.9.9.813.1.3.1.8	CounterBasedGauge64	read-only	This object indicates total number of ingress packets that have been dropped due to corrective action for a given PFC queue of the interface.
cpfcIfPriorityWaitTable	1.3.6.1.4.1.9.9.813.1.4		not-accessible	A collection of objects that provides the time value of the CoS which are paused for each interface.
cpfcIfPriorityWaitEntry	1.3.6.1.4.1.9.9.813.1.4.1		not-accessible	Each entry contains the PFC pause time information of each interface per CoS value.
I32 cpfcIfPriorityWaitCoS	1.3.6.1.4.1.9.9.813.1.4.1.1	Integer32	not-accessible	This object indicates the priority value of the PFC capable interface.
UNS cpfcIfPriorityWaitRx	1.3.6.1.4.1.9.9.813.1.4.1.2	Unsigned64	read-only	This object indicates the time in microseconds for which a link is not transmitting data which indicates the port is in conitnuous pause receiving state.
UNS cpfcIfPriorityWaitTx	1.3.6.1.4.1.9.9.813.1.4.1.3	Unsigned64	read-only	This object indicates the time in microseconds for which a link is not receiving data which indicates the port is in continuous pause transmitting state.
ciscoPfcExtMIBConform	1.3.6.1.4.1.9.9.813.2
ciscoPfcExtMIBCompliances	1.3.6.1.4.1.9.9.813.2.1
ciscoPfcExtMIBCompliance	1.3.6.1.4.1.9.9.813.2.1.1			The compliance statement for the CISCO-PFC-EXT-MIB.
ciscoPfcExtMIBCompliance2	1.3.6.1.4.1.9.9.813.2.1.2			The compliance statement for the CISCO-PFC-EXT-MIB.
ciscoPfcExtMIBCompliance3	1.3.6.1.4.1.9.9.813.2.1.3			The compliance statement for the CISCO-PFC-EXT-MIB.
ciscoPfcExtMIBGroups	1.3.6.1.4.1.9.9.813.2.2
ciscoPfcExtIfGroup	1.3.6.1.4.1.9.9.813.2.2.1			A collection of objects that provides PFC information of each interface capable of providing such information.
ciscoPfcExtIfPriorityGroup	1.3.6.1.4.1.9.9.813.2.2.2			A collection of objects that provides PFC information of each PFC priority of an interface capable of providing such information.
ciscoPfcExtWatchdogIfQueueGroup	1.3.6.1.4.1.9.9.813.2.2.3			A collection of object(s) for PFC watchdog timer information of each queue of an interface capable of providing such information.
ciscoPfcExtWatchdogIfQueueDropInPktGroup	1.3.6.1.4.1.9.9.813.2.2.4			A collection of object(s) for PFC watchdog Ingress Drop packets of each queue of an interface capable of providing such information.
ciscoPfcExtIfPriorityWaitGroup	1.3.6.1.4.1.9.9.813.2.2.5			A collection of object(s) for PFC pause timer value for each CoS of an interface capable of providing such information.

RFC description

Cisco Priority Flow Control (PFC) extension MIB; manages Data Center Bridging (DCB) PFC parameters and statistics on Nexus switches.

Start monitoring Cisco Nexus / data-center switch supporting DCB/FCoE with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CISCO-PFC-EXT-MIB