V-BRIDGE-MIB

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Organization: IETF Bridge MIB Working Group

Last Updated: 2001-07-13

Category: VLAN and Layer 2 Switching

Description: Defines IETF virtual bridge port and VLAN membership management for 802.1Q-aware switches.

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What Is V-BRIDGE-MIB?

V-BRIDGE-MIB is a vendor-neutral IETF extension to the standard Bridge MIB that implements IEEE 802.1v, which defines VLAN classification by protocol and port for 802.1Q-aware switches. It exposes configuration data describing how untagged frames are mapped to VLANs based on protocol type (e.g., IP, IPX) combined with the ingress port, via protocol group and protocol-port group tables. As a configuration-oriented module it is primarily used to monitor and audit VLAN classification policy rather than hardware health, letting an administrator confirm which protocol-to-VLAN mappings are active on each port and detect misconfigurations that misclassify traffic into the wrong VLAN. It depends on and extends the base IETF BRIDGE-MIB and the dot1dBase port model, and is meant to be implemented alongside standard 802.1Q VLAN MIBs. It is typically deployed on enterprise Ethernet switches that support protocol-based VLAN assignment in mixed-protocol network segments, and administrators consult the V-BRIDGE-MIB reference when auditing these bindings.

IPNetwork Monitor allows you to monitor SNMP objects defined in V-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
802.1Q-aware Ethernet switch

Monitoring Examples

An administrator would inspect dot1vProtocolGroupTable (dot1vProtocolGroupEntry) to see which dot1vProtocolTemplateFrameType/dot1vProtocolTemplateProtocolValue pairs are bound to a given dot1vProtocolGroupId, then cross-reference dot1vProtocolPortTable (dot1vProtocolPortEntry) to find which dot1vProtocolPortGroupVid a port's dot1vProtocolPortGroupId resolves to. If traffic from a legacy protocol unexpectedly lands in the wrong VLAN, comparing the expected group VID against dot1vProtocolPortGroupVid on the ingress port would reveal a misconfigured protocol-VLAN binding.

What Can Be Monitored

protocol-to-VLAN group mappings
frame type and protocol value templates
per-port protocol group VLAN ID assignments
protocol group identifiers

Imported Objects

From BRIDGE-MIB

dot1dBasePort	OBJECT-TYPE
dot1dBridge	MODULE-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE

OIDs

OID symbolic	OID numeric	Type	Access	Description
vBridgeMIB	1.3.6.1.2.1.17.13			The Bridge MIB Extension module for managing devices that support VLAN Classification by Protocol and Port defined in IEEE 802.1v.
vBridgeMIBObjects	1.3.6.1.2.1.17.13.1
dot1vProtocol	1.3.6.1.2.1.17.13.1.1
dot1vProtocolGroupTable	1.3.6.1.2.1.17.13.1.1.1		not-accessible	A table that contains mappings from Protocol Templates to Protocol Group Identifiers used for Port-and-Protocol-based VLAN Classification.
dot1vProtocolGroupEntry	1.3.6.1.2.1.17.13.1.1.1.1		not-accessible	A mapping from a Protocol Template to a Protocol Group Identifier.
INT dot1vProtocolTemplateFrameType	1.3.6.1.2.1.17.13.1.1.1.1.1	INTEGER	not-accessible	The data-link encapsulation format or the 'detagged_frame_type' in a Protocol Template.
OCT dot1vProtocolTemplateProtocolValue	1.3.6.1.2.1.17.13.1.1.1.1.2	OCTET STRING	not-accessible	The identification of the protocol above the data-link layer in a Protocol Template. Depending on the frame type, the octet string will have one of the following values: For 'ethernet', 'rfc1042' and 'snap8021H', this is the 16-bit (2-octet) IEEE 802.3 Type Field. For 'snapOther', this is the 40-bit (5-octet) PID. For 'llcOther', this is the 2-octet IEEE 802.2 LSAP pair: first octet for DSAP and second octet for SSAP.
INT dot1vProtocolGroupId	1.3.6.1.2.1.17.13.1.1.1.1.3	INTEGER	read-create	Represents a group of protocols that are associated together when assigning a VID to a frame.
dot1vProtocolPortTable	1.3.6.1.2.1.17.13.1.1.2		not-accessible	A table that contains VID sets used for Port-and-Protocol-based VLAN Classification.
dot1vProtocolPortEntry	1.3.6.1.2.1.17.13.1.1.2.1		not-accessible	A VID set for a port.
INT dot1vProtocolPortGroupId	1.3.6.1.2.1.17.13.1.1.2.1.1	INTEGER	not-accessible	Designates a group of protocols in the Protocol Group Database.
INT dot1vProtocolPortGroupVid	1.3.6.1.2.1.17.13.1.1.2.1.2	INTEGER	read-create	The VID associated with a group of protocols for each port.
vBridgeConformance	1.3.6.1.2.1.17.13.2
vBridgeGroups	1.3.6.1.2.1.17.13.2.1
vBridgeDeviceGroup	1.3.6.1.2.1.17.13.2.1.1			VLAN classification information for the bridge.
vBridgePortGroup	1.3.6.1.2.1.17.13.2.1.2			VLAN classification information for individual ports.
vBridgeCompliances	1.3.6.1.2.1.17.13.2.2
vBridgeCompliance	1.3.6.1.2.1.17.13.2.2.1			The compliance statement for device support of bridging services.

RFC description

IEEE 802.1v VLAN classification by protocol and port for bridge devices. Manages mappings between protocol templates and VLAN protocol group identifiers.

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Download V-BRIDGE-MIB

What Is V-BRIDGE-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description