SRED-MIB

All MIBs › SRED-MIB

Organization: D-Link Corp.

Last Updated: 2009-02-16

Category: D-Link

Description: Manages D-Link selective random early detection queue configuration and drop-probability parameters.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) 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.

What Is SRED-MIB?

SRED-MIB is a D-Link proprietary MIB implementing Simple RED (Random Early Detection), a congestion-avoidance queue-management scheme, alongside related DSCP/802.1p color-mapping and DSCP-trust settings on D-Link managed switches. Its objects cover a global SRED enable state, per-port drop counters (low/high), per-port-per-class drop thresholds and drop rates with a green-traffic drop-state flag, an 802.1p-to-color mapping table, and DSCP-trust/DSCP-mapping control tables. As a configuration/QoS MIB it lets an administrator confirm RED thresholds and DSCP trust/mapping are configured correctly for the intended congestion-management and QoS policy. It is deployed on D-Link managed switches. Engineers can download the SRED-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in SRED-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

D-Link managed switches

Monitoring Examples

An administrator checks swSredCtrlThresholdHigh against observed swSredHighDropCounter values to tune RED thresholds on a congested D-Link switch port before packet loss starts affecting latency-sensitive traffic.

What Can Be Monitored

RED drop counters and thresholds
DSCP/802.1p color mapping

Imported Objects

From DLINK-ID-REC-MIB

dlink-common-mgmt

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using swSredLowDropCounter OID:

Select a D-Link managed switch (Simple RED congestion-avoidance/DSCP-trust configuration) 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 swSredLowDropCounter 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. This object indicates the drop count at low threshold. 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 between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
swSredMIB	1.3.6.1.4.1.171.12.51			The structure of Simple RED Information for the proprietary enterprise.
swSredCtrl	1.3.6.1.4.1.171.12.51.1
INT swSredGlobalState	1.3.6.1.4.1.171.12.51.1.1	INTEGER	read-write	This object enables\disables the Simple RED state of the device.
swSredInfo	1.3.6.1.4.1.171.12.51.2
swSredDropCounterTable	1.3.6.1.4.1.171.12.51.2.1		not-accessible	A table that contains SRED drop packet counter information for each port.
swSredDropCounterEntry	1.3.6.1.4.1.171.12.51.2.1.1		not-accessible	A list that contains SRED drop packet counter information per port.
INT swSredPortIndex	1.3.6.1.4.1.171.12.51.2.1.1.1	INTEGER	read-only	This object indicates the port number.
C32 swSredLowDropCounterEx	1.3.6.1.4.1.171.12.51.2.1.1.2	Counter32	read-only	This object indicates the drop count at low threshold.
C32 swSredHighDropCounter	1.3.6.1.4.1.171.12.51.2.1.1.3	Counter32	read-only	This object indicates the drop count at high threshold.
swSredMgmt	1.3.6.1.4.1.171.12.51.3
swSredCtrlTable	1.3.6.1.4.1.171.12.51.3.1		not-accessible	A table that contains the SRED setting for each port.
swSredCtrlEntry	1.3.6.1.4.1.171.12.51.3.1.1		not-accessible	A list that contains SRED setting per port.
INT swSredCtrlPortIndex	1.3.6.1.4.1.171.12.51.3.1.1.1	INTEGER	read-only	This object indicates the port number.
INT swSredCtrlClassIndex	1.3.6.1.4.1.171.12.51.3.1.1.2	INTEGER	read-only	This object indicates the hardware CoS queues the config sred command will apply to.
INT swSredCtrlThresholdLow	1.3.6.1.4.1.171.12.51.3.1.1.3	INTEGER	read-write	This object indicates the low threshold that specifies the percentage of space utilized.
INT swSredCtrlThresholdHigh	1.3.6.1.4.1.171.12.51.3.1.1.4	INTEGER	read-write	This object indicates the high threshold that specifies the percentage of queue space utilized.
INT swSredCtrlDropRateLow	1.3.6.1.4.1.171.12.51.3.1.1.5	INTEGER	read-write	This object indicates the probabilistic drop rate if above the low threshold.
INT swSredCtrlDropRateHigh	1.3.6.1.4.1.171.12.51.3.1.1.6	INTEGER	read-write	This object indicates the probabilistic drop rate if above the high threshold.
INT swSredCtrlDropGreenState	1.3.6.1.4.1.171.12.51.3.1.1.7	INTEGER	read-write	This object indicates the drop green state. Setting this state to be disabled means probabilistic drop red colored packets if the queue depth is above the low threshold, and probabilistic drop yellow colored packets if the queue depth is above the high threshold. Setting this state to be enabled means probabilistic drop yellow and red colored packets if the queue depth is above the low threshold, and probabilistic drop green colored packets if the queue depth is above the high threshold.
sw8021pColorMapCtrlTable	1.3.6.1.4.1.171.12.51.3.2		not-accessible	A table that contains information about priority map to packet color on each port.
sw8021pColorMapCtrlEntry	1.3.6.1.4.1.171.12.51.3.2.1		not-accessible	A list that contains priority map to packet color on per port.
INT sw8021pColorMapCtrlPortIndex	1.3.6.1.4.1.171.12.51.3.2.1.1	INTEGER	read-only	This object indicates the port number.
INT sw8021pColorMapCtrlPriorityIndex	1.3.6.1.4.1.171.12.51.3.2.1.2	INTEGER	read-only	This object indicates the source priority of incoming packets.
INT sw8021pColorMapCtrlColor	1.3.6.1.4.1.171.12.51.3.2.1.3	INTEGER	read-write	This object indicates the source priority of incoming packets.
swDscpTrustPortCtrlTable	1.3.6.1.4.1.171.12.51.3.3		not-accessible	A table that contains information about the DSCP trust portlist.
swDscpTrustPortCtrlEntry	1.3.6.1.4.1.171.12.51.3.3.1		not-accessible	A list that contains the DSCP trusted state per port.
INT swDscpTrustPortCtrlPortIndex	1.3.6.1.4.1.171.12.51.3.3.1.1	INTEGER	read-only	This object indicates the port number.
INT swDscpTrustPortCtrlState	1.3.6.1.4.1.171.12.51.3.3.1.2	INTEGER	read-write	This object is used to enable/disable the DSCP trusted state on a selected port.
swDscpMapCtrlTable	1.3.6.1.4.1.171.12.51.3.4		not-accessible	A table that contains information about DSCP map to priority and packet color on each port.
swDscpMapCtrlEntry	1.3.6.1.4.1.171.12.51.3.4.1		not-accessible	A list that contains DSCP map information for each port.
INT swDscpMapCtrlPortIndex	1.3.6.1.4.1.171.12.51.3.4.1.1	INTEGER	read-only	This object indicates the port number.
INT swDscpMapCtrlDscpIndex	1.3.6.1.4.1.171.12.51.3.4.1.2	INTEGER	read-only	This object indicates the source DSCP incoming packet.
INT swDscpMapCtrl8021pPriority	1.3.6.1.4.1.171.12.51.3.4.1.3	INTEGER	read-write	This object indicates the 802.1p priority on each port. Default value is: DSCP Priority 0-7 0 8-15 1 16-23 2 24-31 3 32-39 4 40-47 5 48-55 6 56-63 7
INT swDscpMapCtrlNewDscp	1.3.6.1.4.1.171.12.51.3.4.1.4	INTEGER	read-write	This object indicates the new DSCP map on each port.
INT swDscpMapCtrlColor	1.3.6.1.4.1.171.12.51.3.4.1.5	INTEGER	read-write	This object maps the color for packets on each port.

RFC description

SNMP MIB for Stabilized RED (Random Early Detection) queue management. Monitors and configures congestion management parameters for router buffers, stabilizing queue lengths across varying numbers of TCP connections.

Start monitoring D-Link managed switches (Simple RED congestion-avoidance/DSCP-trust configuration) 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 SRED-MIB