CT-PRIORITY-CLASSIFY-MIB

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Category: Quality of Service, Vendor: Cabletron/Enterasys

Description: Configures traffic classification rules for priority assignment on Cabletron/Enterasys switch platforms.

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What Is CT-PRIORITY-CLASSIFY-MIB?

CT-PRIORITY-CLASSIFY-MIB is a legacy Cabletron Systems proprietary MIB classifying RTP/RTCP and UDP traffic into a low-delay priority queue for voice-quality preservation. Its objects cover an RTP low-delay-queue preference level (0-7) and RTCP parsing enable, an RTP table (per interface: state, TOS precedence, 802.1p tag priority, VLAN ID), and a UDP table (per port number: state, low-delay-queue preference). As a configuration MIB it lets an administrator confirm RTP traffic on a given interface is classified into the correct low-delay queue and priority marking. It is deployed on legacy Cabletron Systems networking equipment carrying VoIP traffic. Engineers can download the CT-PRIORITY-CLASSIFY-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CT-PRIORITY-CLASSIFY-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

Legacy Cabletron Systems networking equipment (VoIP)

Monitoring Examples

An administrator checks pClassifyRTPTagPriority to confirm voice RTP traffic is being tagged with the intended 802.1p priority on a legacy Cabletron switch.

What Can Be Monitored

RTP/UDP traffic priority classification

Imported Objects

From CTRON-MIB-NAMES

ctPriorityExt

OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

OIDs

OID symbolic	OID numeric	Type	Access	Description
ctPriorityExtClassifyConfig	1.3.6.1.4.1.52.4.1.2.14.5
pClassifyRTP	1.3.6.1.4.1.52.4.1.2.14.5.1
INT pClassifyRTPLowDelayQueuePreference	1.3.6.1.4.1.52.4.1.2.14.5.1.1	INTEGER	read-write	This value represents one of eight preference levels, 0 through 7, with 0 being the worst and 7 the best. The value will be translated by the device into a three bit binary number. This value shall be used to put incoming RTP packets on an internal queue.
INT pClassifyRTCPParsing	1.3.6.1.4.1.52.4.1.2.14.5.1.2	INTEGER	read-write	This object will enable or disable parsing of all forwarded packets looking for RTCP packets. Enabled(2) means that all fowarded packets will be parsed for RTCP. When an RTCP packet is found, the identification of the associated RTP 'connection' (next lower port number) is added to the list of low delay ports. Disabled(1) means that no packets will be parsed.
pClassifyRTPTable	1.3.6.1.4.1.52.4.1.2.14.5.1.3		not-accessible	A list describing which MIB-II interfaces will allow 802.1 P/Q tagging or modification of the precedence field in the TOS portion of an IP packet or both. It also specifies the tagging value and the TOS precedence where applicable.
pClassifyRTPEntry	1.3.6.1.4.1.52.4.1.2.14.5.1.3.1		not-accessible	This entry for pClassifyRTPEntry.
INT pClassifyRTPInterfaceNumber	1.3.6.1.4.1.52.4.1.2.14.5.1.3.1.1	INTEGER	read-only	The index of the MIB-II interface that the packet is destined for.
INT pClassifyRTPState	1.3.6.1.4.1.52.4.1.2.14.5.1.3.1.2	INTEGER	read-write	This object will enable or disable modification of the TOS precedence field and the 802.1 P/Q tagging. A value of NoModification(1) implies that modification is not allowed. OnlyQTag(2) means that only 802.1 P/Q tagging is allowed. When this object has a value OnlyQTOS(3), modification of only the TOS precedence field is permitted. QTagAndQTOS means that both TOS precedence modification and P/Q tagging is allowed.
INT pClassifyRTPTOSPrecedence	1.3.6.1.4.1.52.4.1.2.14.5.1.3.1.3	INTEGER	read-write	This value represents one of eight precedence levels, 0 through 7, with 0 being the lowest and 7 the highest. The value will be translated by the device into a three bit binary number for use as the precedence field in the TOS portion of the IP Datagram. This object is valid only if pClassifyRTPState is OnlyQTOS or QTagAndQTOS.
INT pClassifyRTPTagPriority	1.3.6.1.4.1.52.4.1.2.14.5.1.3.1.4	INTEGER	read-write	This value represents one of eight priority levels, 0 through 7, with 0 being the lowest and 7 the highest. The value will be translated by the device into a three bit binary number for use as the user_priority field of the TCI (Tag Control Information) format. This object is only valid if pClassifyRTPState is OnlyQTag or QTagAndQTOS.
INT pClassifyRTPTagVID	1.3.6.1.4.1.52.4.1.2.14.5.1.3.1.5	INTEGER	read-write	This value represents a twelve bit VLAN identifier (VID) as specified in the IEEE 802.1Q standard. This object will provide a twelve bit VID in the TCI (Tag Control Information) portion of a tagged frame as specified in the IEEE 802.1Q. This value will be used to classify qualified packets in accordance with the IEEE 802.1Q standard. This object will also be used to reclassify certain packets exiting the port specified in pClassifyRTPInterfaceNumber whose TCI field contains a VID equal to the NULL VLAN ID. This object is valid only if pClassifyRTPState is OnlyQTag or QTagAndQTOS.
pClassifyUDP	1.3.6.1.4.1.52.4.1.2.14.5.2
pClassifyUDPTable	1.3.6.1.4.1.52.4.1.2.14.5.2.1		not-accessible	A list of UDP destination port numbers, UDP packets whose port numbers appear in this table will be put on a low delay queue, and the preference specified.
pClassifyUDPEntry	1.3.6.1.4.1.52.4.1.2.14.5.2.1.1		not-accessible	A list of objects that describe the UDP port numbers that qualify as candidates for low delay queue preference classification.
INT pClassifyUDPPortNumber	1.3.6.1.4.1.52.4.1.2.14.5.2.1.1.1	INTEGER	read-write	The UDP destination port number tha qualifies as a candidate for low delay classification.
INT pClassifyUDPState	1.3.6.1.4.1.52.4.1.2.14.5.2.1.1.2	INTEGER	read-write	A packet with UDP port number equal to pClassifyUDPPortNumber will be put on a low_delay queue if state is Enabled(2).
INT pClassifyUDPLowDelayQueuePreference	1.3.6.1.4.1.52.4.1.2.14.5.2.1.1.3	INTEGER	read-write	Preference with which packet with UDP destination port number equal to pClassifyUDPPortNumberis put on the queue.

RFC description

Cabletron priority classification MIB for RTP and UDP packet queuing and tagging.

Start monitoring Legacy Cabletron Systems switch (RTP/VoIP priority classification) 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 CT-PRIORITY-CLASSIFY-MIB

What Is CT-PRIORITY-CLASSIFY-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description