U-BRIDGE-MIB

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Organization: IETF Bridge MIB Working Group

Last Updated: 2001-11-16

Category: IETF Standards

Description: Defines IETF standard objects for provider bridges and MAC address learning in IEEE 802.1 networks.

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What Is U-BRIDGE-MIB?

U-BRIDGE-MIB is a vendor-neutral IETF-style Bridge MIB extension that adds support for GARP Multicast Registration Protocol (GMRP) and Restricted VLAN Registration under IEEE 802.1u/802.1Q, extending the base Bridge MIB and Q-BRIDGE-MIB frameworks for managed Ethernet switches. It exposes per-port configuration and status objects controlling whether GMRP-based dynamic multicast group registration and dynamic VLAN registration are restricted on a port, along with tables recording the last group/VLAN registration that failed and the reason for that failure. Its monitoring focus is on Layer-2 control-plane software behavior rather than physical hardware sensors: operators use it to confirm which ports have restricted VLAN/GMRP registration enabled and to diagnose failed dynamic group or VLAN registration attempts, which surface as connectivity or multicast-forwarding problems on a switched network. It explicitly extends and depends on the IETF BRIDGE-MIB (dot1dBridge) and Q-BRIDGE-MIB (dot1qVlan) object trees, reusing their port/VLAN indexing. Network engineers can consult the U-BRIDGE-MIB reference when it is deployed on enterprise/campus Ethernet switches from any vendor implementing IEEE 802.1u/802.1Q restricted registration features, not tied to one manufacturer.

IPNetwork Monitor allows you to monitor SNMP objects defined in U-BRIDGE-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
IEEE 802.1u/802.1Q-capable Ethernet switch

Monitoring Examples

An administrator would poll dot1dExtPortGmrpTable/dot1dExtPortGmrpEntry to check dot1dPortRestrictedGroupRegistration per port and inspect dot1dPortLastGroupFailed together with dot1dPortGmrpFailingReason to diagnose why a dynamic multicast group registration was rejected on a given port; similarly, dot1qExtPortVlanTable/dot1qExtPortVlanEntry with dot1qPortRestrictedVlanRegistration and dot1qPortGvrpFailingReason would reveal a port that is refusing dynamic VLAN registration and why, helping isolate a misconfigured trunk or restricted-access port.

What Can Be Monitored

per-port GMRP restricted-registration setting
last failed dynamic multicast group registration and reason
per-port restricted VLAN registration setting
last failed dynamic VLAN (GVRP) registration and reason

Imported Objects

From BRIDGE-MIB

dot1dBasePort	OBJECT-TYPE
dot1dBasePortEntry	OBJECT-TYPE
dot1dBridge	MODULE-IDENTITY

From P-BRIDGE-MIB

dot1dGmrp

OBJECT-IDENTITY

From Q-BRIDGE-MIB

dot1qPvid	OBJECT-TYPE
dot1qVlan	OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

MacAddress
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
NTF gmrpFailure	1.3.6.1.2.1.17.0.3			The trap that is generated when there is a GMRP failure. dot1dPortLastGroupFailed indicates the MAC address of the Group that has failed to be registered, dot1dBasePort indicates the port on which the registration is received, and dot1dPortGmrpFailingReason indicates the reason for the failure.
NTF gvrpFailure	1.3.6.1.2.1.17.0.4			The trap that is generated when there is a GVRP failure. dot1qPvid indicates the VID of he VLAN that GVRP has failed to register, dot1dBasePort indicates the port on which the registration is received, and dot1qPortGvrpFailingReason indicates the reason for the failure.
dot1dExtPortGmrpTable	1.3.6.1.2.1.17.6.1.4.2		not-accessible	A table containing per port Restricted Group Registration control information.
dot1dExtPortGmrpEntry	1.3.6.1.2.1.17.6.1.4.2.1		not-accessible	Information controlling Group Registration for a port on the device. This is indexed by dot1dBasePort.
T/F dot1dPortRestrictedGroupRegistration	1.3.6.1.2.1.17.6.1.4.2.1.1	TruthValue	read-write	The state of Restricted Group Registration on this port. If the value of this control is true(1), then creation of a new dynamic entry is permitted only if there is a Static Filtering Entry for the VLAN concerned, in which the Registrar Administrative Control value is Normal Registration.
MAC dot1dPortLastGroupFailed	1.3.6.1.2.1.17.6.1.4.2.1.2	MacAddress	accessible-for-notify	The MAC address of the Group GMRP failed to register on this port. This object is accessible only through gmrpFailure notification.
INT dot1dPortGmrpFailingReason	1.3.6.1.2.1.17.6.1.4.2.1.3	INTEGER	accessible-for-notify	The reason for the last registration failure on this port. The value 'lackofResources(1)' indicates that GMRP failed due to lack of resources in the Filtering Database for the creation of a Group Registration Entry. The value 'registrationRestricted(2)' indicates that GMRP failed because dynamic group is restricted. This object is accessible only through gmrpFailure notification.
dot1qExtPortVlanTable	1.3.6.1.2.1.17.7.1.4.11		not-accessible	A table containing per port Restricted VLAN Registration control information.
dot1qExtPortVlanEntry	1.3.6.1.2.1.17.7.1.4.11.1		not-accessible	Information controlling VLAN Registration for a port on the device. This is indexed by dot1dBasePort.
T/F dot1qPortRestrictedVlanRegistration	1.3.6.1.2.1.17.7.1.4.11.1.1	TruthValue	read-write	The state of Restricted VLAN Registration on this port. If the value of this control is true(1), then creation of a new dynamic VLAN entry is permitted only if there is a Static VLAN Registration Entry for the VLAN concerned, in which the Registrar Administrative Control value for this port is Normal Registration.
INT dot1qPortGvrpFailingReason	1.3.6.1.2.1.17.7.1.4.11.1.2	INTEGER	accessible-for-notify	The reason for the last registration failure on this port. The value 'lackofResources(1)' indicates that GVRP failed due to lack of resources in the Filtering Database for the creation of a VLAN Registration Entry. The value 'registrationRestricted(2)' indicates that GVRP failed because dynamic VLAN registration is restricted. And the value 'unsupportedVID(3)' indicates that a registration request for an unsupported VID is received.
uBridgeMIB	1.3.6.1.2.1.17.12			The Bridge MIB Extension module for managing devices that allow control over dynamic VLAN registration through Restricted VLAN Registration as defined by IEEE 802.1u.
uBridgeConformance	1.3.6.1.2.1.17.12.1
uBridgeGroups	1.3.6.1.2.1.17.12.1.1
uBridgePortVlanGroup	1.3.6.1.2.1.17.12.1.1.1			Per-port Restricted VLAN Registration Control parameter
uBridgePortGmrpGroup	1.3.6.1.2.1.17.12.1.1.2			Per-port Restricted Group Registration Control parameter
uBridgeTrapGroup	1.3.6.1.2.1.17.12.1.1.3			GMRP and GVRP notifications
uBridgeCompliances	1.3.6.1.2.1.17.12.1.2
uBridgeCompliance	1.3.6.1.2.1.17.12.1.2.1			The compliance statement for device support of bridging services.

RFC description

Manages restricted VLAN registration on IEEE 802.1u-compliant bridges for dynamic group membership control.

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Download U-BRIDGE-MIB

What Is U-BRIDGE-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description