CISCO-ENHANCED-WRED-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2001-12-21

Category: Cisco Devices, Quality of Service

Description: Manages Cisco enhanced Weighted Random Early Detection (WRED) QoS, configuring drop thresholds and monitoring queue discard statistics.

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What Is CISCO-ENHANCED-WRED-MIB?

CISCO-ENHANCED-WRED-MIB manages Cisco's Weighted Random Early Detection/Drop (WRED) quality-of-service feature, which proactively drops packets based on IP precedence or DSCP-derived average queue depth to avoid output-interface congestion before it becomes severe. It exposes transmit-side (cewredTxTable) and receive-side (cewredRxTable, cewredRxIfTable) configuration tables that associate WRED parameter sets with interfaces or traffic classification values, each governed by a row-status object. Its monitoring value is centered on QoS/traffic-health visibility: by tracking which cewredTxValue/cewredRxSourceId-DestId configurations are active and in what row status, an operator can confirm WRED policies are correctly applied, and combined with interface drop counters elsewhere can infer whether congestion-avoidance drops correlate with actual queue congestion. It is a Cisco-specific QoS MIB that assumes an underlying interface/queueing model (commonly used alongside IF-MIB and Cisco's own QoS MIBs) but has no strict dependency stated. It is deployed on Cisco routers and switches performing IP-precedence or DSCP-based congestion avoidance on WAN or aggregation interfaces, where CISCO-ENHANCED-WRED-MIB SNMP monitoring confirms policies remain correctly applied.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-ENHANCED-WRED-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 routers and switches with WRED-capable QoS

Monitoring Examples

A network engineer would poll cewredTxTable (via cewredTxEntry) to confirm cewredTxValue settings are correctly applied per traffic class and cewredTxRowStatus shows active, then check cewredRxTable/cewredRxIfTable for corresponding receive-side WRED thresholds keyed by cewredRxSourceId and cewredRxDestId. If a table entry unexpectedly shows a non-active cewredRxIfValue row status after a configuration push, WRED would not be enforcing congestion avoidance on that interface, potentially explaining unexpected tail-drop behavior instead of the expected weighted early discard.

What Can Be Monitored

WRED configuration row status
transmit-side WRED threshold values
receive-side WRED source/destination mapping
per-interface WRED settings

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From ENTITY-MIB

PhysicalIndex
entPhysicalIndex	OBJECT-TYPE

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
Gauge32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

RowStatus
TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using cewredStatSwitchedPkts OID:

Select a Cisco routers and switches with WRED-capable QoS 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 cewredStatSwitchedPkts 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 packets output by WRED. 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 (in packets), 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
ciscoEnhancedWredMIB	1.3.6.1.4.1.9.9.222			Cisco WRED MIB - Overview Cisco Weighted Random Early Detection/Drop (WRED) is a method which avoids traffic congestion on an output interface. Congestion is detected by computing the average output queue size against queue thresholds, which can be configured either per IP precedence or differentiated services code point (DSCP) based. WRED support are on the IP fast switching and IP flow switching only. It does not apply to IP process switching. The purpose of this MIB is to provide Weighted Random Early Detection/Drop packet configuration and packet filtering information. This MIB provides the WRED information about the transmit (Tx) side and receive (Rx) side of the modules, for the managed systems that support WRED on both transmit side and receive side.
cewredMIBNotifications	1.3.6.1.4.1.9.9.222.0
ciscoEnhancedWredMIBObjects	1.3.6.1.4.1.9.9.222.1
cewredTx	1.3.6.1.4.1.9.9.222.1.1
cewredTxTable	1.3.6.1.4.1.9.9.222.1.1.1		not-accessible	This table contains the mapping entries that associate WRED configuration with an egress interface. This table is used for creating or modifying or retrieving transmit side WRED information.
cewredTxEntry	1.3.6.1.4.1.9.9.222.1.1.1.1		not-accessible	Entries used for providing transmit side WRED information. If this entry got deleted, the corresponding cewredConfigGlobIndex (identified by cewredTxValue) associated entry in cewredConfigGlobTable is also deleted. If a entry corresponding to the value of cewredTxValue does not exist in the cewredConfigGlobTable, the value of cewredTxValue can be (re)used as an index to create a new entry in the cewredConfigGlobTable for building association between this mapping table and the cewredConfigGlobTable.
CEW cewredTxValue	1.3.6.1.4.1.9.9.222.1.1.1.1.1	CewredIndex	read-create	This object specifies the value of cewredConfigGlobIndex which associates the WRED configuration with ifIndex associated egress interface. This value can not be modified when cewredTxRowStatus is active(1). The value of this object must not be same as the values of the following objects: cewredRxIfValue, cewredRxValue, cewredRxMulticastValue.
ROW cewredTxRowStatus	1.3.6.1.4.1.9.9.222.1.1.1.1.2	RowStatus	read-create	The status of this conceptual row. This object is used for creating, modifying and deleting entries in the cewredTxTable.
cewredRx	1.3.6.1.4.1.9.9.222.1.2
cewredRxIfTable	1.3.6.1.4.1.9.9.222.1.2.1		not-accessible	This table contains the mapping entries that associate WRED configuration with a source module and destination interface combination.
cewredRxIfEntry	1.3.6.1.4.1.9.9.222.1.2.1.1		not-accessible	Entries containing the mapping that associate the receive side WRED configuration to the physical entity of type PhysicalClass module(9) which supports WRED with per interface queueing on the receive side. If this entry got deleted, the corresponding cewredConfigGlobIndex (identified by cewredRxIfValue) associated entry in cewredConfigGlobTable is also deleted. If a entry corresponding to the value of cewredRxIfValue does not exist in the cewredConfigGlobTable, the value of cewredRxIfValue can be (re)used as an index to create a new entry in the cewredConfigGlobTable for building association between this mapping table and the cewredConfigGlobTable.
CEW cewredRxIfValue	1.3.6.1.4.1.9.9.222.1.2.1.1.1	CewredIndex	read-create	This object specifies the value of cewredConfigGlobIndex which associates the WRED configuration with the source module (identified by entPhysicalIndex) and destination interface (identified by the ifIndex) combination.This value can't be modified when cewredRxRowStatus is active(1). The value of this object must not be same as the values of the following objects: cewredTxValue, cewredRxValue, cewredRxMulticastValue.
ROW cewredRxIfRowStatus	1.3.6.1.4.1.9.9.222.1.2.1.1.2	RowStatus	read-create	The status of this conceptual row. This object is used for creating, modifying and deleting entries in the cewredRxIfTable.
cewredRxTable	1.3.6.1.4.1.9.9.222.1.2.2		not-accessible	This table contains the mapping entries that associate WRED configuration with a source module and destination module combination.
cewredRxEntry	1.3.6.1.4.1.9.9.222.1.2.2.1		not-accessible	Entries containing the mapping that associate the receive side WRED configuration to the physical entity of type PhysicalClass module(9) which supports WRED with per module queueing on the receive side. If this entry got deleted, the corresponding cewredConfigGlobIndex (identified by cewredRxValue) associated entry in cewredConfigGlobTable is also deleted. If a entry corresponding to the value of cewredRxValue does not exist in the cewredConfigGlobTable, the value of cewredRxValue can be (re)used as an index to create a new entry in the cewredConfigGlobTable for building association between this mapping table and the cewredConfigGlobTable.
PHY cewredRxSourceId	1.3.6.1.4.1.9.9.222.1.2.2.1.1	PhysicalIndex	not-accessible	The entPhysicalIndex of the source module, supporting per module queueing on receive side to which WRED configuration was attached.
PHY cewredRxDestId	1.3.6.1.4.1.9.9.222.1.2.2.1.2	PhysicalIndex	not-accessible	On the receive side, WRED configuration is applied on the traffic going from a source module to a destination module. This object represents the entPhysicalIndex of the destination module where source module is being represented by cewredRxSourceId.
CEW cewredRxValue	1.3.6.1.4.1.9.9.222.1.2.2.1.3	CewredIndex	read-create	This object specifies the value which can be used by cewredConfigGlobIndex object, which associates WRED configuration with the source module (identified by cewredRxSourceId) and destination module (identified by cewredRxDestId) combination. This value can't be modified when cewredRxRowStatus is active(1). The value of this object must not be same as the values of the following objects: cewredTxValue, cewredRxIfValue, cewredRxMulticastValue.
ROW cewredRxRowStatus	1.3.6.1.4.1.9.9.222.1.2.2.1.4	RowStatus	read-create	The status of this conceptual row. This object is used for creating, modifying and deleting entries in the cewredRxTable.
cewredRxMulticastTable	1.3.6.1.4.1.9.9.222.1.2.3		not-accessible	This table contains the mapping entries that associate WRED configuration on the multicast traffic of a module on the receive side.
cewredRxMulticastEntry	1.3.6.1.4.1.9.9.222.1.2.3.1		not-accessible	Entries used to provide WRED information for the physical entities of type PhysicalClass module(9) that support WRED on multicast traffic on the receive side. If this entry got deleted, the corresponding cewredConfigGlobIndex (identified by cewredRxMulticastValue) associated entry in cewredConfigGlobTable is also deleted. If a entry corresponding to the value of cewredRxMulticastValue does not exist in the cewredConfigGlobTable, the value of cewredRxMulticastValue can be (re)used as an index to create a new entry in the cewredConfigGlobTable for building association between this mapping table and the cewredConfigGlobTable.
CEW cewredRxMulticastValue	1.3.6.1.4.1.9.9.222.1.2.3.1.1	CewredIndex	read-create	This object specifies the value which can be used by cewredConfigGlobIndex object, which associates WRED configuration on the multicast traffic of the source module (identified by entPhysicalIndex) on the receive side. This value can't be modified when cewredRxMulticastRowStatus is active(1). The value of this object must not be same as the values of the following objects: cewredTxValue, cewredRxIfValue, cewredRxValue.
ROW cewredRxMulticastRowStatus	1.3.6.1.4.1.9.9.222.1.2.3.1.2	RowStatus	read-create	The status of this conceptual row. This object is used for creating, modifying and deleting entries in the cewredRxMulticastTable.
cewredConfig	1.3.6.1.4.1.9.9.222.1.3
cewredConfigGlobTable	1.3.6.1.4.1.9.9.222.1.3.1		not-accessible	A table of WRED global configuration variables.
cewredConfigGlobEntry	1.3.6.1.4.1.9.9.222.1.3.1.1		not-accessible	A collection of configuration entries. On the transmit side of a module an Entry of this table is created/deleted when the interface is associated/disassociated respectively with random early detection. On the receive side, an entry of this table is created or deleted when the entries representing cewredConfigGlobIndex is associated/disassociated respectively with random early detection. An entry in this table created only when the corresponding entry providing the value for cewredConfigGlobIndex is created in one of the following mapping tables: cewredTxTable, cewredRxIfTable, cewredRxTable, cewredRxMulticastTable. Deletion of this entry will not cause the deletion of the corresponding entry (entry providing cewredConfigGlobIndex) in the mapping tables.
CEW cewredConfigGlobIndex	1.3.6.1.4.1.9.9.222.1.3.1.1.1	CewredIndex	not-accessible	Index into the cewredConfigGlobTable. For the managed systems which support WRED configuration on both transmit side and receive side, this index will be obtained by one of the following mapping table entries: cewredTxTable, cewredRxIfTable, cewredRxTable, cewredRxMulticastTable. This index will be obtained through cewredTxValue object in case of WRED applied on an interface on the transmit side. If WRED is applied on the receive side, this index will be obtained through cewredRxIfvalue if the module supports per module/interface queueing on the receive side, otherwise this index will be obtained through to cewredRxValue. For multicast on the receive side, this index will be obtained through cewredRxMulticastValue. For the managed systems, which only support interface level WRED configuration, this value can be equal to the ifIndex associated with the interface.
STR cewredConfigGlobCosGroupName	1.3.6.1.4.1.9.9.222.1.3.1.1.2	SnmpAdminString	read-create	The name of the class of service queue group under which all WRED parameters are configured. For the managed systems, which do not support class of service queue groups, this value will be a zero length string.
U32 cewredConfigGlobQueueWeight	1.3.6.1.4.1.9.9.222.1.3.1.1.3	Unsigned32	read-create	The decay factor for the queue average calculation. Numbers are 2's exponent up to 16. The smaller the number, the faster it decays.
CEW cewredConfigGlobDscpPrec	1.3.6.1.4.1.9.9.222.1.3.1.1.4	CewredRedMechanism	read-create	The classification mechanism used by WRED - precedence or DSCP-based. This entry can't be modified if there exists corresponding entry with different RED mechanism in the following cewredConfigRedTable. For example for a given cewredConfigGlobIndex, if there exists precedence based configuration in the cewredConfigRedTable, this value can't be changed to dscp(2).
ROW cewredConfigGlobRowStatus	1.3.6.1.4.1.9.9.222.1.3.1.1.5	RowStatus	read-create	The status of this conceptual row. This object is used for creating, modifying and deleting entries in the cewredConfigGlobTable. This value can be set to active(1) only if the corresponding row in one of the following mapping tables is having a row status value active(1): cewredTxTable, cewredRxIfTable, cewredRxTable, cewredRxMulticastTable.
cewredConfigRedTable	1.3.6.1.4.1.9.9.222.1.3.2		not-accessible	A table of WRED configuration values with respect to the IP precedence or DSCP value of packets.
cewredConfigRedEntry	1.3.6.1.4.1.9.9.222.1.3.2.1		not-accessible	WRED IP precedence/DSCP configuration table entry. If the WRED configuration is per interface based, an entry of this table is created/deleted when a combination of interface and cewredConfigRedValue is associated/disassociated respectively with random early detection. On the receive side, an entry of this table is created or deleted when a combination of entries representing cewredConfigGlobIndex and cewredConfigRedValue is associated/disassociated respectively with random early detection.
U32 cewredConfigRedValue	1.3.6.1.4.1.9.9.222.1.3.2.1.1	Unsigned32	not-accessible	The IP precedence or DSCP value of this entry.
CEW cewredConfigRedQueueNumber	1.3.6.1.4.1.9.9.222.1.3.2.1.2	CewredQueueNumber	read-create	The queue number of the distributed round robin queue associated with this RedValue. For each queue there are RED parameters associated with it depending upon its precedence or DSCP value. For the managed systems which do not support multiple distributed round robin queues, this number will be 1.
CEW cewredConfigRedProfile	1.3.6.1.4.1.9.9.222.1.3.2.1.3	CewredRedProfile	read-create	The value of the WRED profile associated with the cewredConfigRedValue. This object value will be equal to the WRED profile value for the managed systems that support a mapping of many precedences or DSCP values to a WRED profile, otherwise this object value will be same as the precedence or DSCP value associated with this entry.
U32 cewredConfigRedMinThreshold	1.3.6.1.4.1.9.9.222.1.3.2.1.4	Unsigned32	read-create	The average queue depth at which WRED begins to drop packets. Below this value no packets will be dropped.
U32 cewredConfigRedMaxThreshold	1.3.6.1.4.1.9.9.222.1.3.2.1.5	Unsigned32	read-create	The average queue depth at which WRED may begin to drop all packets. Above this value all the packets will be dropped
U32 cewredConfigRedPktsDropFract	1.3.6.1.4.1.9.9.222.1.3.2.1.6	Unsigned32	read-create	The fraction of packets to be dropped when the average queue depth is at cewredConfigRedMaxThreshold. The mark probability denominator maps to this object. For example if this value is 500, then one out of every 500 packets is to be dropped when the average queue length is at the maximum threshold.
ROW cewredConfigRedRowStatus	1.3.6.1.4.1.9.9.222.1.3.2.1.7	RowStatus	read-create	The status of this conceptual row. This object is used for creating, modifying and deleting entries in the cewredConfigRedTable. This value can be set to active(1) only if the corresponding row in one of the following mapping tables is having a row status value active(1): cewredTxTable, cewredRxIfTable, cewredRxTable, cewredRxMulticastTable.
cewredQueue	1.3.6.1.4.1.9.9.222.1.4
cewredQueueParamTable	1.3.6.1.4.1.9.9.222.1.4.1		not-accessible	A table of WRED queue parameters.
cewredQueueParamEntry	1.3.6.1.4.1.9.9.222.1.4.1.1		not-accessible	An entry in the table of WRED queue parameters. Entries represent the queue parameters of the distributed round robin queues.
CEW cewredQueueParamNumber	1.3.6.1.4.1.9.9.222.1.4.1.1.1	CewredQueueNumber	not-accessible	The queue number associated with this entry. There can be multiple distributed round robin queues exists on the transmit side as well as on the receive side of the managed system. For each queue there are WRED parameters associated with it depend upon its precedence or DSCP value. For the managed systems which do not support multiple distributed round robin queues this number will be 1.
U32 cewredQueueParamWeight	1.3.6.1.4.1.9.9.222.1.4.1.1.2	Unsigned32	read-write	The weight of this queue. The weights give a relative bandwidth for each queue when there is congestion. The distributed round robin algorithm dequeues data from each queue for processing depending upon its weight.
G32 cewredQueueParamAverage	1.3.6.1.4.1.9.9.222.1.4.1.1.3	Gauge32	read-only	The computed queue average length. This value is based on the Exponential weighting factor (cewredConfigGlobQueueWeight), the old average length of the queue and current queue size.
G32 cewredQueueParamMaxAverage	1.3.6.1.4.1.9.9.222.1.4.1.1.4	Gauge32	read-write	Historically maximum value of cewredQueueParamAverage. Write is required only to clear this object, i.e, this object can only be set to zero.
G32 cewredQueueParamDepth	1.3.6.1.4.1.9.9.222.1.4.1.1.5	Gauge32	read-only	The number of packets currently withheld in the queue and awaiting transmission.
G32 cewredQueueParamMaxDepth	1.3.6.1.4.1.9.9.222.1.4.1.1.6	Gauge32	read-write	Historically maximum value of cewredQueueParamDepth. Write is required only to clear this object, i.e, this object can only be set to zero.
cewredStat	1.3.6.1.4.1.9.9.222.1.5
cewredStatTable	1.3.6.1.4.1.9.9.222.1.5.1		not-accessible	A table of WRED status information with respect to the IP precedence or DSCP value of packets.
cewredStatEntry	1.3.6.1.4.1.9.9.222.1.5.1.1		not-accessible	The WRED status information entry.
CEW cewredStatRedProfile	1.3.6.1.4.1.9.9.222.1.5.1.1.1	CewredRedProfile	not-accessible	The value of the WRED profile associated with the entry. This value will be equal to the WRED profile value for the managed systems that support a mapping of many precedences or DSCP values to a WRED profile, otherwise this object value will be same as the precedence or DSCP value.
C32 cewredStatSwitchedPktsEx	1.3.6.1.4.1.9.9.222.1.5.1.1.2	Counter32	read-only	The number of packets output by WRED.
C32 cewredStatRandomFilteredPkts	1.3.6.1.4.1.9.9.222.1.5.1.1.3	Counter32	read-only	The number of packets filtered/dropped when average queue length exceeds cewredRedConfigMinThreshold and less than cewredConfigRedMaxThreshold and meet a defined random drop policy pointed by the WRED config tables.
C32 cewredStatMaxFilteredPkts	1.3.6.1.4.1.9.9.222.1.5.1.1.4	Counter32	read-only	The number of packets filtered/dropped when average queue length exceeds cewredConfigRedMaxThreshold.
C64 cewredStatSwitchedPkts64	1.3.6.1.4.1.9.9.222.1.5.1.1.5	Counter64	read-only	The number of packets output by WRED. This object is a 64-bit version of cewredStatSwitchedPkts.
C64 cewredStatRandomFilteredPkts64	1.3.6.1.4.1.9.9.222.1.5.1.1.6	Counter64	read-only	The number of packets filtered/dropped when average queue length exceeds cewredRedConfigMinThreshold and less than cewredConfigRedMaxThreshold and meet a defined random drop policy pointed by the WRED config tables. This object is a 64-bit version of cewredStatRandomFilteredPkts.
C64 cewredStatMaxFilteredPkts64	1.3.6.1.4.1.9.9.222.1.5.1.1.7	Counter64	read-only	The number of packets filtered/dropped when average queue length exceeds cewredConfigRedMaxThreshold. This object is a 64-bit version of cewredStatMaxFilteredPkts.
cewredMIBConformance	1.3.6.1.4.1.9.9.222.3
cewredMIBCompliances	1.3.6.1.4.1.9.9.222.3.1
cewredMIBCompliance	1.3.6.1.4.1.9.9.222.3.1.1			The compliance statement for entities which implement WRED.
cewredMIBGroups	1.3.6.1.4.1.9.9.222.3.2
ciscoEnhancedWredGroup	1.3.6.1.4.1.9.9.222.3.2.1			A collection of objects providing WRED monitoring feature.
ciscoEnhancedWredDrrQueueGroup	1.3.6.1.4.1.9.9.222.3.2.2			A collection of objects providing distributed round robin queue parameters.
ciscoEnhancedWredStatCountGroup	1.3.6.1.4.1.9.9.222.3.2.3			A collection of objects providing random early detection/drop statistics.
ciscoEnhancedWredCosQueueGroup	1.3.6.1.4.1.9.9.222.3.2.4			A collection of objects providing class of service information.
ciscoEnhancedWredTxInfoGroup	1.3.6.1.4.1.9.9.222.3.2.5			A collection of objects providing transmit side WRED information.
ciscoEnhancedWredRxIfInfoGroup	1.3.6.1.4.1.9.9.222.3.2.6			A collection of objects providing receive side WRED information, with the modules supporting per interface queueing.
ciscoEnhancedWredRxInfoGroup	1.3.6.1.4.1.9.9.222.3.2.7			A collection of objects providing receive side WRED information, with the modules supporting per module queueing.
ciscoEnhancedWredRxMcInfoGroup	1.3.6.1.4.1.9.9.222.3.2.8			A collection of objects providing receive side WRED information, with the modules supporting multicast queueing.

RFC description

Management Information Base for Cisco Weighted Random Early Detection (WRED) congestion avoidance mechanisms. Provides objects for configuring packet drop strategies on router interfaces based on IP precedence and DSCP values.

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