A3COM0503-PORTINFO

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Category: Network Interfaces, Vendor: 3Com

Description: Provides extended port information objects for 3Com switch products, including per-port traffic statistics, duplex mode, and link operational status.

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What Is A3COM0503-PORTINFO?

A3COM0503-PORTINFO is a private 3Com MIB providing extended per-port information beyond standard bridge/interface MIBs, covering VLAN egress/ingress behavior, Spanning Tree Protocol port settings, and forwarding-database entries for 3Com switch products. It exposes a port information table with VLAN membership details (egress, forbidden-egress, and untagged VLANs, plus PVID), STP port priority and enable state, frame-acceptance and ingress-filtering policy, and a separate per-port forwarding database (FDB) table. Its monitoring focus is configuration and Layer 2 forwarding status: an operator checks VLAN tagging behavior per port, confirms STP participation and priority are as designed, and inspects the FDB to see which MAC addresses are currently learned on a port. It extends the standards-based Q-BRIDGE-MIB/BRIDGE-MIB VLAN and spanning-tree model with 3Com-specific detail rather than replacing it. It is deployed on 3Com switch products where administrators need granular per-port VLAN and STP visibility beyond what standard bridge MIBs provide. Engineers can download the A3COM0503-PORTINFO file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in A3COM0503-PORTINFO. 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

3Com Layer 2 switches

Monitoring Examples

An operator walks portInfoTable/portInfoEntry to check portInfoPvid, portInfoEgressVlans, and portInfoUntaggedVlans against the intended VLAN trunk design, and portInfoAcceptableFrameTypes/portInfoIngressFiltering to confirm a port is correctly rejecting untagged or out-of-VLAN frames. portInfoStpPortEnable and portInfoStpPortPriority are checked to verify STP is active with the expected priority on that port, while portInfoFdbTable/portInfoFdbEntry shows the currently learned MAC addresses, revealing an unexpected device or MAC flap on the port.

What Can Be Monitored

per-port VLAN membership/tagging
PVID
STP port priority and enable state
ingress filtering/frame-type policy
per-port forwarding database (learned MACs)

Imported Objects

From BRIDGE-MIB

MacAddress

From GENERIC-3COM-VLAN-MIB-1-0-7

a3ComVlanGroup

OBJECT-IDENTITY

From Q-BRIDGE-MIB

VlanIndex

From RFC-1212

OBJECT-TYPE

From RFC1213-MIB

ifIndex

From SNMPv2-TC

RowStatus
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
portInfoTable	1.3.6.1.4.1.43.10.1.14.1.3		not-accessible	A table indexed by ifIndex of a port. This can be a font-panel/module port e.g. 101 or an aggregator 15512.
portInfoEntry	1.3.6.1.4.1.43.10.1.14.1.3.1		not-accessible	Bridge information for a port
VLA portInfoEgressVlans	1.3.6.1.4.1.43.10.1.14.1.3.1.1	VlanList	read-write	The set of vlans on which this port is allowed to transmit traffic.
VLA portInfoForbiddenEgressVlans	1.3.6.1.4.1.43.10.1.14.1.3.1.2	VlanList	read-write	The set of vlans on which this port is forbidden to transmit.
VLA portInfoUntaggedVlans	1.3.6.1.4.1.43.10.1.14.1.3.1.3	VlanList	read-write	The set of vlans on which this port transmits untagged frames.
INT portInfoStpPortPriority	1.3.6.1.4.1.43.10.1.14.1.3.1.4	INTEGER	read-write	The value of the priority field which is contained in the first (in network byte order) octet of the (2 octet long) Port ID. The other octet of the Port ID is given by the value of dot1dStpPort..
INT portInfoStpPortEnable	1.3.6.1.4.1.43.10.1.14.1.3.1.5	INTEGER	read-write	The enabled/disabled status of the port.
VLA portInfoPvid	1.3.6.1.4.1.43.10.1.14.1.3.1.6	VlanIndex	read-write	The PVID, the VLAN ID assigned to untagged frames or Prority-Tagged frames received on this port.
INT portInfoAcceptableFrameTypes	1.3.6.1.4.1.43.10.1.14.1.3.1.7	INTEGER	read-write	When this is admitOnlyVlanTagged(2) the device will discard untagged frames or Prority-Tagged frames received on this port. When admitAll(1), untagged frames or Prority-Tagged frames received on this port will be accepted and assigned to the PVID for this port. This control does not affect VLAN independent BPDU frames, such as GVRP and STP. It does affect VLAN dependent BPDU frames, such as GMRP.
T/F portInfoIngressFiltering	1.3.6.1.4.1.43.10.1.14.1.3.1.8	TruthValue	read-write	When this is true(1) the device will discard incoming frames for VLANs which do not include this Port in its Member set. When false(2), the port will accept all incoming frames. This control does not affect VLAN independent BPDU frames, such as GVRP and STP. It does affect VLAN dependent BPDU frames, such as GMRP.
portInfoFdbTable	1.3.6.1.4.1.43.10.1.14.1.4		not-accessible	This table contains the static unicast addresses for each port in the bridge.
portInfoFdbEntry	1.3.6.1.4.1.43.10.1.14.1.4.1		not-accessible	Information about a specific unicast MAC address.
INT portInfoFdbIndex	1.3.6.1.4.1.43.10.1.14.1.4.1.1	INTEGER	not-accessible	This contains the ifIndex of the port that this address has been seen on.
VLA portInfoFdbVlan	1.3.6.1.4.1.43.10.1.14.1.4.1.2	VlanIndex	not-accessible	The Vlan index of the port.
MAC portInfoFdbAddress	1.3.6.1.4.1.43.10.1.14.1.4.1.3	MacAddress	not-accessible	This object contains the unicast MAC address of the entry.
ROW portInfoFdbStatus	1.3.6.1.4.1.43.10.1.14.1.4.1.4	RowStatus	read-only	This has useful states of active, destroy, and createAndGo. An fdb entry can be created with a state of createAndGo or active. The fdb entry can be deleted by setting the state to destroy.

RFC description

Provides port VLAN membership, STP configuration, and 802.1Q tagging parameters for 3Com switches.

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Download A3COM0503-PORTINFO

What Is A3COM0503-PORTINFO?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description