CISCO-WRED-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 1997-07-18

Category: Quality of Service, Vendor: Cisco Devices

Description: Manages Cisco WRED (Weighted Random Early Detection) queue thresholds for congestion avoidance.

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What Is CISCO-WRED-MIB?

The CISCO-WRED-MIB configures and monitors Weighted Random Early Detection (WRED), a congestion-avoidance queuing mechanism applied to output interfaces on Cisco routers using IP fast or flow switching. It exposes per-interface/queue configuration data such as global queue weight and per-precedence minimum/maximum depth thresholds and drop-fraction settings, alongside real-time queue statistics including average queue depth. Its monitoring value is in traffic performance: comparing the current average queue depth against configured minimum/maximum thresholds reveals whether an interface queue is approaching congestion, and rising drop fractions for a given precedence directly explain packet loss or QoS misbehavior on that link. It complements Cisco's broader class-based QoS MIB family and standard IF-MIB interface counters for correlating congestion with interface load. It is deployed on Cisco routers using IP fast/flow switching on WAN-facing interfaces where WRED congestion avoidance is configured. Network engineers evaluating or troubleshooting this functionality can download the CISCO-WRED-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-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 using IP fast/flow switching (WAN interfaces)

Monitoring Examples

An engineer monitors cwredQueueTable/cwredQueueEntry's cwredQueueAverage for an interface, comparing it against cwredConfigPrecedTable's cwredConfigPrecedMinDepthThreshold and cwredConfigPrecedMaxDepthThreshold for each IP precedence. A queue average persistently near the max threshold, combined with a high cwredConfigPrecedPktsDropFraction for lower-precedence traffic, indicates the interface is congested and WRED is aggressively dropping best-effort packets, explaining complaints about intermittent packet loss for background traffic.

What Can Be Monitored

average output queue depth
per-precedence minimum/maximum queue thresholds
packet drop fraction per precedence
WRED queue weight configuration

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
Integer32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using cwredStatSwitchedPkts OID:

Select a Cisco routers using IP fast/flow switching (WRED) 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 cwredStatSwitchedPkts 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
ciscoWredMIB	1.3.6.1.4.1.9.9.83			Cisco WRED MIB - Overview Cisco Weighted Random Early Detection/Drop is a method which avoids traffic congestion on an output interface. Congestion is detected by computing the average output queue size against preset thresholds. WRED support are on the IP fast switching and IP flow switching only. It does not apply to IP process switching. This MIB incorporates objects from the Cisco WRED line interfaces. Its purpose is to provide Weighted Random Early Detection/Drop packet configuration and packet filtering information. WRED are configured/enabled through the CLI command. Defaults configuration values are assigned and values can be modified through additional CLI commands.
ciscoWredMIBObjects	1.3.6.1.4.1.9.9.83.1
cwredConfig	1.3.6.1.4.1.9.9.83.1.1
cwredConfigGlobTable	1.3.6.1.4.1.9.9.83.1.1.1		not-accessible	A table of WRED global configuration variables.
cwredConfigGlobEntry	1.3.6.1.4.1.9.9.83.1.1.1.1		not-accessible	A collection of configuration entries on this interface. Entries are created and deleted via red command line interface.
I32 cwredConfigGlobQueueWeight	1.3.6.1.4.1.9.9.83.1.1.1.1.1	Integer32	read-only	The decay factor for the queue average calculation. Numbers are 2's exponent up to 16. The smaller the number, the faster it decays.
cwredConfigPrecedTable	1.3.6.1.4.1.9.9.83.1.1.2		not-accessible	A table of WRED configuration values with respect to the IP precedence of packets.
cwredConfigPrecedEntry	1.3.6.1.4.1.9.9.83.1.1.2.1		not-accessible	WRED IP precedence configuration table entry. Entries are created and deleted via red command interface.
I32 cwredConfigPrecedPrecedence	1.3.6.1.4.1.9.9.83.1.1.2.1.1	Integer32	not-accessible	The IP precedence of this entry.
I32 cwredConfigPrecedMinDepthThreshold	1.3.6.1.4.1.9.9.83.1.1.2.1.2	Integer32	read-only	The average queue depth at which WRED begins to drop packets.
I32 cwredConfigPrecedMaxDepthThreshold	1.3.6.1.4.1.9.9.83.1.1.2.1.3	Integer32	read-only	The average queue depth at which WRED may begin to drop all packets.
I32 cwredConfigPrecedPktsDropFraction	1.3.6.1.4.1.9.9.83.1.1.2.1.4	Integer32	read-only	The fraction of packets to be dropped when the average queue depth is above cwredConfigPrecedMinDepthThreshold but below cwredConfigPrecedMaxDepthThreshold.
cwredStats	1.3.6.1.4.1.9.9.83.1.2
cwredQueueTable	1.3.6.1.4.1.9.9.83.1.2.1		not-accessible	A table of WRED queue status variable.
cwredQueueEntry	1.3.6.1.4.1.9.9.83.1.2.1.1		not-accessible	A table of WRED queue status variable entry. Entries are created and deleted via the red command line interface.
G32 cwredQueueAverage	1.3.6.1.4.1.9.9.83.1.2.1.1.1	Gauge32	read-only	The computed queue average length.
G32 cwredQueueDepth	1.3.6.1.4.1.9.9.83.1.2.1.1.2	Gauge32	read-only	The number of buffers/particles currently withheld in queue.
cwredStatTable	1.3.6.1.4.1.9.9.83.1.2.2		not-accessible	A table of WRED status information with respect to the IP precedence of packets.
cwredStatEntry	1.3.6.1.4.1.9.9.83.1.2.2.1		not-accessible	The WRED interface status information entry. Entries are created and deleted via the red red command line interface.
C32 cwredStatSwitchedPktsEx	1.3.6.1.4.1.9.9.83.1.2.2.1.1	Counter32	read-only	The number of packets output by WRED.
C32 cwredStatRandomFilteredPkts	1.3.6.1.4.1.9.9.83.1.2.2.1.2	Counter32	read-only	The number of packets filtered/dropped due to average queue length exceeds cwredConfigMinDepthThreshold and meet a defined random drop policy.
C32 cwredStatMaxFilteredPkts	1.3.6.1.4.1.9.9.83.1.2.2.1.3	Counter32	read-only	The number of packets filtered/dropped due to average queue length exceeds cwredConfigMaxDepthThreshold.
ciscoWredMIBConformance	1.3.6.1.4.1.9.9.83.3
ciscoWredMIBCompliances	1.3.6.1.4.1.9.9.83.3.1
ciscoWredMIBCompliance	1.3.6.1.4.1.9.9.83.3.1.1			The compliance statement for entities which implement the WRED on a Cisco RSP platform.
ciscoWredMIBGroups	1.3.6.1.4.1.9.9.83.3.2
ciscoWredMIBGroup	1.3.6.1.4.1.9.9.83.3.2.1			A collection of objects providing WRED monitoring.

RFC description

Provides configuration and monitoring for Weighted Random Early Detection/Drop congestion avoidance on output interfaces to prevent traffic congestion.

Start monitoring Cisco routers using IP fast/flow switching (WRED) 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-WRED-MIB