DIFFSERV-CONFIG-MIB

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Organization: SNMPCONF WG

Last Updated: 2004-01-22

Category: Network Interfaces, Quality of Service

Description: Provides a higher-level configuration interface for Differentiated Services, bridging network-wide QoS policy definitions and the instance-specific DIFFSERV-MIB objects.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring DIFFSERV-CONFIG-MIB with a free 30-day trial of IPNetwork Monitor.

What Is DIFFSERV-CONFIG-MIB?

DIFFSERV-CONFIG-MIB is a vendor-neutral, standards-based IETF MIB (RFC 3747) that provides a higher-level configuration interface for Differentiated Services (DiffServ) quality-of-service policy. It exposes a table of named configuration entries that act as reusable templates, which can be instantiated and associated with a specific interface and traffic direction to activate a QoS policy. As a monitoring module it is used to check the software configuration state of QoS policy management -- which templates exist, who owns them, when they last changed, and whether a given configuration is currently active -- which is important for confirming a QoS rollout took effect as intended rather than silently failing to apply. It explicitly depends on the base DIFFSERV-MIB (RFC 3289), whose per-instance datapath objects this module's templates are used to instantiate. It is deployed on routers and switches implementing DiffServ QoS, typically configured and monitored centrally by policy-management or NMS software. Engineers can download the DIFFSERV-CONFIG-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in DIFFSERV-CONFIG-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

vendor-neutral, standards-based MIB, not tied to a specific manufacturer
routers and switches implementing IETF DiffServ QoS

Monitoring Examples

An administrator polling diffServConfigTable can enumerate configuration entries via diffServConfigId and diffServConfigDescr, check diffServConfigOwner to see which management application created a given policy template, and use diffServConfigStart together with diffServConfigStatus to confirm whether the template is currently activated on an interface. A recent diffServConfigLastChange timestamp on a config an administrator didn't expect to change would flag an unauthorized or accidental QoS policy modification.

What Can Be Monitored

QoS config template ID/description
config ownership
config activation state
config last-change timestamp
config row status/storage type

Imported Objects

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE
mib-2
zeroDotZero

From SNMPv2-TC

DateAndTime
RowPointer
RowStatus
StorageType

OIDs

OID symbolic	OID numeric	Type	Access	Description
diffServConfigMib	1.3.6.1.2.1.108			This MIB module contains differentiated services specific managed objects to perform higher-level configuration management. This MIB allows policies to use 'templates' to instantiate Differentiated Services functional datapath configurations to be assigned (associated with an interface and direction) when a policy is activated. Copyright (C) The Internet Society (2004). This version of this MIB module is part of RFC 3747; see the RFC itself for full legal notices.
diffServConfigMIBObjects	1.3.6.1.2.1.108.1
diffServConfigTable	1.3.6.1.2.1.108.1.2		not-accessible	A table which defines the various per-hop-behaviors for which the system has default 'templates'.
diffServConfigEntry	1.3.6.1.2.1.108.1.2.1		not-accessible	An entry defining a per-hop-behavior. Each entry in this table combines the various parameters (entries) into a specific per-hop-behavior. Entries in this table might be defined by a vendor (pre-configured) or defined by a management application.
STR diffServConfigId	1.3.6.1.2.1.108.1.2.1.1	SnmpAdminString	not-accessible	A unique id for the per-hop-behavior policy for at least the SNMP agent. For ease of administration the value may be unique within an administrative domain, but this is not required. The range of up to 116 octets is chosen to stay within the SMI limit of 128 sub-identifiers in an object identifier.
STR diffServConfigDescr	1.3.6.1.2.1.108.1.2.1.2	SnmpAdminString	read-create	A human-readable description to identify this defined per-hop-behavior. Note that this is an SnmpAdminString, which permits UTF-8 strings. An administratively assigned identifier for a template that would be unique within an administrative domain. It is up to the management applications to agree how these are assigned within the administrative domain. Once a description, such as 'EF' is assigned, that has a certain set of parameters that achieve 'EF' from box to box. Management application code or script code can then scan the table to find the proper template and then assign it.
STR diffServConfigOwner	1.3.6.1.2.1.108.1.2.1.3	SnmpAdminString	read-create	The owner who created this entry.
DAT diffServConfigLastChange	1.3.6.1.2.1.108.1.2.1.4	DateAndTime	read-only	The date and time when this entry was last changed.
NUM diffServConfigStart	1.3.6.1.2.1.108.1.2.1.5	RowPointer	read-create	The pointer to a functional datapath configuration template as set up in the DIFFSERV-MIB. This RowPointer should point to an instance of one of: diffServClfrEntry diffServMeterEntry diffServActionEntry diffServAlgDropEntry diffServQEntry A value of zeroDotZero in this attribute indicates no further Diffserv treatment is performed on traffic of this functional datapath. This also means that the template described by this row is not defined. If the row pointed to does not exist, the treatment is as if this attribute contains a value of zeroDotZero.
STO diffServConfigStorage	1.3.6.1.2.1.108.1.2.1.6	StorageType	read-create	The type of storage used for this row. Since an entry in this table serves as a starting point for a configuration, it is recommended that all entries comprising the configuration started by diffServConfigStart follow the storage type of this entry. Otherwise, after agent reboots a configuration may differ. It may very well be that the agent is not capable of detecting such changes and therefore, the management application should verify the correct configuration after a reboot. Rows with a StorageType of 'permanent' do not need to allow write access to any of the columnar objects in that row.
ROW diffServConfigStatus	1.3.6.1.2.1.108.1.2.1.7	RowStatus	read-create	RowStatus object used for creation and deletion of rows in this table. All writable objects in this row may be modified at any time.
diffServConfigMIBConformance	1.3.6.1.2.1.108.2
diffServConfigMIBCompliances	1.3.6.1.2.1.108.2.1
diffServConfigMIBFullCompliance	1.3.6.1.2.1.108.2.1.1			The full compliance for this MIB module. For this compliance level the 'diffServMIBFullCompliance' must be met, since this MIB module depends on it in order to provide the configuration entries.
diffServConfigMIBGroups	1.3.6.1.2.1.108.2.2
diffServConfigMIBConfigGroup	1.3.6.1.2.1.108.2.2.1			The per-hop-behavior Group defines the MIB objects that describe the configuration template for the per-hop-behavior.

RFC description

Provides differentiated services configuration management using policy templates for per-hop-behavior datapath setup.

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Download DIFFSERV-CONFIG-MIB

What Is DIFFSERV-CONFIG-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description