CISCO-FCC-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2004-07-08

Category: Cisco Devices, Fibre Channel and Storage

Description: Provides management objects for Fibre Channel Congestion Control (FCC) monitoring and configuration on Cisco MDS SAN switches.

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What Is CISCO-FCC-MIB?

CISCO-FCC-MIB manages Fibre Channel Congestion Control (FCC), a Cisco proprietary flow-control mechanism designed to alleviate congestion on Fibre Channel SAN fabrics running on MDS switches. It exposes configuration data (enable/disable FCC, packet priority, notification enablement) and operational/statistical data per port such as edge and path quench packets sent/received, current congestion state, and timestamps of the last congestion event. It is a performance/fault MIB whose main monitoring value is detecting and diagnosing fabric congestion: cFCCCurrentCongestionState and the quench packet counters directly reveal whether a port is actively congested and how the switch is reacting to relieve it. It is a Cisco proprietary mechanism with no dependency on external Fibre Channel or IETF standards for congestion control specifically. It is deployed on Cisco MDS 9000 series SAN switches in fabrics experiencing or at risk of Fibre Channel congestion. Engineers can download the CISCO-FCC-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-FCC-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 MDS Fibre Channel SAN switches

Monitoring Examples

An operator would poll cFCCPortTable/cFCCPortEntry to check cFCCCurrentCongestionState per port, and monitor cFCCEdgeQuenchPktsSent and cFCCPathQuenchPktsSent for a rising trend indicating the switch is actively signaling congestion upstream. A recent cFCCLastCongestionStartTime combined with elevated cFCCEdgeQuenchPktsRecd would confirm the port has been experiencing sustained congestion requiring traffic engineering or bandwidth upgrades.

What Can Be Monitored

per-port congestion state
edge/path quench packets sent and received
last congestion start/occurrence time
FCC enable status and packet priority

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From CISCO-ST-TC

FcAddressId
VsanIndex

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

TEXTUAL-CONVENTION
TimeStamp
TruthValue

How to Use in IPNetwork Monitor

Example using cFCCEdgeQuenchPktsRecd OID:

Select a Cisco MDS Fibre Channel SAN switch 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 cFCCEdgeQuenchPktsRecd 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. The number of Edge Quench packets received and processed on this Port. 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 Counter32-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
ciscoFCCMIB	1.3.6.1.4.1.9.9.365			The MIB module for the management of Fibre Channel Congestion Control(FCC). FCC is a Cisco proprietary flow control mechanism that alleviates congestion on Fibre Channel networks. This MIB enables managers to configure the FCC mechanism on the switch, provides statistics of the congestion control packets, notification of congestion state changes of the FC port and monitoring of the congestion state of the FC port.
ciscoFCCMIBNotifs	1.3.6.1.4.1.9.9.365.0
NTF ciscoFCCCongestionStateChange	1.3.6.1.4.1.9.9.365.0.1			Notification to indicate that the congestion state of this port has changed. cFCCCongestionState indicates the new state of the port.
NTF ciscoFCCCongestionRateLimitStart	1.3.6.1.4.1.9.9.365.0.2			Notification to indicate that the rate limiting has begun on this port for a source-destination pair.
NTF ciscoFCCCongestionRateLimitEnd	1.3.6.1.4.1.9.9.365.0.3			Notification to indicate that the rate limiting has been stopped on this port for a source-destination pair.
ciscoFCCMIBObjects	1.3.6.1.4.1.9.9.365.1
cFCCConfig	1.3.6.1.4.1.9.9.365.1.1
INT cFCCEnable	1.3.6.1.4.1.9.9.365.1.1.1	INTEGER	read-write	To enable/disable FCC on the device.
I32 cFCCPacketPriority	1.3.6.1.4.1.9.9.365.1.1.2	Integer32	read-write	The traffic Priority for the FCC packets. The generated FCC quench packets should be granted high, but not highest priority, so that the FCC packet priority is higher than the normal data traffic priority but lower than control and critical traffic priority. This ensures that the packets of the protocols guaranteeing the proper behavior of the fabric are not disturbed by quench packets. 0 is the lowest priority and 7 is the highest.
T/F cFCCNotificationEnable	1.3.6.1.4.1.9.9.365.1.1.3	TruthValue	read-write	This object specifies whether the agent should generate the notifications defined in this MIB module. If the value of this object is 'true', then the notifications are generated. If the value of this object is 'false', then the notifications are not generated.
cFCCPortEntries	1.3.6.1.4.1.9.9.365.1.2
cFCCPortTable	1.3.6.1.4.1.9.9.365.1.2.1		not-accessible	A table providing statistics and status for FCC on a per FC Port basis.
cFCCPortEntry	1.3.6.1.4.1.9.9.365.1.2.1.1		not-accessible	Each entry contains the FCC statistics and status for a particular FC port identified by the value of ifIndex.
C32 cFCCEdgeQuenchPktsRecdEx	1.3.6.1.4.1.9.9.365.1.2.1.1.1	Counter32	read-only	The number of Edge Quench packets received and processed on this Port.
C32 cFCCEdgeQuenchPktsSent	1.3.6.1.4.1.9.9.365.1.2.1.1.2	Counter32	read-only	The number of Edge Quench packets generated on this Port as result of congestion.
C32 cFCCPathQuenchPktsRecd	1.3.6.1.4.1.9.9.365.1.2.1.1.3	Counter32	read-only	The number of Path Quench packets recieved and processed on this Port.
C32 cFCCPathQuenchPktsSent	1.3.6.1.4.1.9.9.365.1.2.1.1.4	Counter32	read-only	The number of Path Quench packets generated on this Port as result of congestion.
CIS cFCCCurrentCongestionState	1.3.6.1.4.1.9.9.365.1.2.1.1.5	CiscoFCCCongestionState	read-only	The current FCC congestion state of this Port indicating the severity of the congestion.
TIM cFCCLastCongestedTime	1.3.6.1.4.1.9.9.365.1.2.1.1.6	TimeStamp	read-only	The value of sysUpTime at the most recent time the congestion state of the Port changed to noCongestion(1) from some other value. 0 if the congestion state of the Port has never transitioned to noCongestion(1) since the last restart of the device.
TIM cFCCLastCongestionStartTime	1.3.6.1.4.1.9.9.365.1.2.1.1.7	TimeStamp	read-only	The value of sysUpTime at the most recent time the congestion state (value of corresponding instance of 'cFCCCurrentCongestionState') of the Port changed from 'noCongestion' to some other value. 0 if the congestion state of the Port has never transitioned from 'noCongestion' to some other value since the last restart of the device.
T/F cFCCIsRateLimitingApplied	1.3.6.1.4.1.9.9.365.1.2.1.1.8	TruthValue	read-only	The value of this object indicates if the rate limiting is currently being applied on this Port. If the value of this object is 'true', the rate limiting is currently being applied on this Port. If the value of this object is 'false', the rate limiting is not being applied currently on this Port.
cFCCNotifObjects	1.3.6.1.4.1.9.9.365.1.3
ADR cFCCCongestionSourceID	1.3.6.1.4.1.9.9.365.1.3.1	FcAddressId	accessible-for-notify	The FC_ID associated with the Source causing the congestion. The value is extracted from the FCC congestion quench packet.
ADR cFCCCongestionDestinationID	1.3.6.1.4.1.9.9.365.1.3.2	FcAddressId	accessible-for-notify	The FC_ID associated with the Destination that is part of Source-Destination Flow causing the congestion. The value is extracted from the FCC congestion quench packet.
VSA cFCCCongestionNotifyVSANIndex	1.3.6.1.4.1.9.9.365.1.3.3	VsanIndex	accessible-for-notify	Id of the VSAN containing the Source-Destination flow causing the congestion. The value is extracted from the FCC congestion quench packet. This along with cFCCCongestionSourceID and cFCCCongestionDestinationID gives the Flow causing the congestion.
CIS cFCCCongestionState	1.3.6.1.4.1.9.9.365.1.3.4	CiscoFCCCongestionState	accessible-for-notify	This is to indicate the congestion state of the port.
ciscoFCCMIBConformance	1.3.6.1.4.1.9.9.365.2
ciscoFCCMIBCompliances	1.3.6.1.4.1.9.9.365.2.1
ciscoFCCMIBCompliance	1.3.6.1.4.1.9.9.365.2.1.1			The compliance statement for entities which implement the CISCO-FCC-MIB.
ciscoFCCMIBComplianceRev1	1.3.6.1.4.1.9.9.365.2.1.2			The compliance statement for entities which implement the CISCO-FCC-MIB.
ciscoFCCMIBGroups	1.3.6.1.4.1.9.9.365.2.2
cFCCConfigurationGroup	1.3.6.1.4.1.9.9.365.2.2.1			A collection of objects for FCC configuration.
cFCCPortEntriesGroup	1.3.6.1.4.1.9.9.365.2.2.2			A collection of objects for FCC Statistics and Status.
cFCCNotificationObjectsGroup	1.3.6.1.4.1.9.9.365.2.2.3			A collection of objects defined for notification only.
cFCCNotificationGroup	1.3.6.1.4.1.9.9.365.2.2.4			A collection of notifications for Congestion Monitoring.
cFCCPortEntriesGroupRev1	1.3.6.1.4.1.9.9.365.2.2.5			A collection of objects for FCC Statistics and Status.

RFC description

Fibre Channel Congestion Control (FCC) flow control mechanism management and congestion state monitoring.

Start monitoring Cisco MDS Fibre Channel SAN switches 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-FCC-MIB