HM2-L2MCAST-MIB

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Organization: Hirschmann Automation and Control GmbH

Last Updated: 2012-01-10

Category: Technology: Multicast, Vendor: Belden

Description: Hirschmann HiOS (HM2) Layer 2 multicast MIB for IGMP snooping and MLD snooping configuration.

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What Is HM2-L2MCAST-MIB?

HM2-L2MCAST-MIB is a Hirschmann (Belden) enterprise MIB for the HiOS platform (HM2 subtree), used to configure and monitor Layer 2 multicast handling via IGMP/MLD snooping on industrial Ethernet switches. It exposes configuration and status data for the snooping querier function, static and auto-detected multicast query ports, and forward-all port lists, alongside a statistics subtree for snooping activity. Rather than hardware health, this MIB's monitoring value is in software/network-service status: confirming the IGMP/MLD snooping querier is active on the correct ports, that forward-all ports are correctly provisioned, and that snooping statistics show expected multicast join/leave activity, all of which affect whether multicast traffic (e.g. industrial control or video) is delivered efficiently or flooded. It builds on the general Hirschmann HM2 platform MIB structure and standard IGMP/MLD snooping concepts defined by IETF but is Hirschmann-proprietary in its object naming. It is typically deployed in industrial automation and process-control Ethernet networks using Hirschmann managed switches, and engineers commonly start with an HM2-L2MCAST-MIB download to load the module into their monitoring platform.

IPNetwork Monitor allows you to monitor SNMP objects defined in HM2-L2MCAST-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

Hirschmann HiOS-based industrial Ethernet switches

Monitoring Examples

An engineer would poll hm2L2McastSnoopingQuerierTable to verify hm2L2McastSnoopingQueryPorts and hm2L2McastSnoopingQueryStaticPorts match the intended querier port configuration, catching a misconfigured or missing multicast querier that would degrade multicast delivery. Checking hm2L2McastSnoopingForwardAllTable's hm2L2McastSnoopingForwardAllStaticPorts confirms which ports are set to always receive multicast traffic regardless of group membership, useful when troubleshooting unexpected multicast flooding. The hm2L2McastSnoopingStatistics subtree would be reviewed to spot an abnormal drop or spike in snooped join/leave message counts indicating a misbehaving multicast source or receiver.

What Can Be Monitored

IGMP/MLD snooping querier ports
static vs auto-detected query ports
forward-all port configuration
snooping statistics/counters
multicast filtering configuration

Imported Objects

From HM2-TC-MIB

hm2ConfigurationMibs

OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From Q-BRIDGE-MIB

PortList
dot1qVlanIndex	OBJECT-TYPE

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using hm2L2McastSnoopingIgmpReportsFramesProcessed OID:

Select a Hirschmann HiOS industrial Ethernet switch (IGMP/MLD snooping) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type hm2L2McastSnoopingIgmpReportsFramesProcessed into the Find box to locate it in the OID tree, then select it and click OK. It reports iGMP reports, joins or leaves processed by CPU. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
hm2L2McastMib	1.3.6.1.4.1.248.11.33			Hirschmann L2 Multicast MIB. Copyright (C) 2012. All Rights Reserved.
hm2L2McastMibNotifications	1.3.6.1.4.1.248.11.33.0
hm2L2McastMibObjects	1.3.6.1.4.1.248.11.33.1
hm2L2McastSnoopingObjects	1.3.6.1.4.1.248.11.33.1.1
hm2L2McastSnoopingGroup	1.3.6.1.4.1.248.11.33.1.1.1
hm2L2McastSnoopingQuerierTable	1.3.6.1.4.1.248.11.33.1.1.1.1		not-accessible	A table for displaying and configuring the IGMP query ports.
hm2L2McastSnoopingQuerierEntry	1.3.6.1.4.1.248.11.33.1.1.1.1.1		not-accessible	A table for displaying and configuring the IGMP query ports. An entry appears in this table for all VLANs that are currently instantiated.
POR hm2L2McastSnoopingQueryPorts	1.3.6.1.4.1.248.11.33.1.1.1.1.1.1	PortList	read-only	This read-only object displays the set of ports that have received IGMP query PDUs for this VLAN as determined by the snooping task.
POR hm2L2McastSnoopingQueryStaticPorts	1.3.6.1.4.1.248.11.33.1.1.1.1.1.2	PortList	read-write	The set of ports explicitly configured by management to be IGMP query ports for this VLAN.
POR hm2L2McastSnoopingQueryPortsAutoPorts	1.3.6.1.4.1.248.11.33.1.1.1.1.1.3	PortList	read-only	The set of ports that are automatically learned by LLDP protocol to be IGMP query ports for this VLAN.
POR hm2L2McastSnoopingQueryPortsAutoPortsState	1.3.6.1.4.1.248.11.33.1.1.1.1.1.4	PortList	read-write	The set of ports that are allowed to be learned automatically by LLDP protocol to be IGMP query ports for this VLAN.
hm2L2McastSnoopingForwardAllTable	1.3.6.1.4.1.248.11.33.1.1.1.2		not-accessible	A table containing forwarding information for each VLAN, specifying the set of ports to which forwarding of all multicasts applies, which are dynamically learnt.
hm2L2McastSnoopingForwardAllEntry	1.3.6.1.4.1.248.11.33.1.1.1.2.1		not-accessible	Forwarding information for a VLAN, specifying the set of ports to which all multicasts should be forwarded, which are dynamically learnt. An entry appears in this table for all VLANs that are currently instantiated.
POR hm2L2McastSnoopingForwardAllStaticPorts	1.3.6.1.4.1.248.11.33.1.1.1.2.1.1	PortList	read-write	The set of ports configured by management in this VLAN to which all dyamically learnt multicast group-addressed frames are to be forwarded.
hm2L2McastFilteringObjects	1.3.6.1.4.1.248.11.33.1.2
hm2L2McastFilteringGroup	1.3.6.1.4.1.248.11.33.1.2.1
hm2L2McastFilteringTable	1.3.6.1.4.1.248.11.33.1.2.1.1		not-accessible	A table for configuring the filtering behaviour for known multicast group-addressed frames.
hm2L2McastFilteringEntry	1.3.6.1.4.1.248.11.33.1.2.1.1.1		not-accessible	A table for configuring the filtering behaviour for known multicast group-addressed frames. An entry appears in this table for all VLANs that are currently instantiated.
INT hm2L2McastFilteringKnownMode	1.3.6.1.4.1.248.11.33.1.2.1.1.1.1	INTEGER	read-write	Sets the mode how known multicast packets will be treated. The default value is registered-ports-only(2).
INT hm2L2McastFilteringUnknownMode	1.3.6.1.4.1.248.11.33.1.2.1.2	INTEGER	read-write	Sets the mode how unknown multicast packets will be treated. The default value is flood(2).
hm2L2McastSnoopingStatistics	1.3.6.1.4.1.248.11.33.1.3
hm2L2McastSnoopingStatisticsGroup	1.3.6.1.4.1.248.11.33.1.3.1
C32 hm2L2McastSnoopingIgmpReportsFramesProcessedEx	1.3.6.1.4.1.248.11.33.1.3.1.1	Counter32	read-only	IGMP reports, joins or leaves processed by CPU. The number of multicast control frames that have been processed by the CPU.
C32 hm2L2McastSnoopingIgmpQueriesV1FramesProcessed	1.3.6.1.4.1.248.11.33.1.3.1.2	Counter32	read-only	IGMP queries version 1 processed by CPU. The number of multicast control frames that have been processed by the CPU.
C32 hm2L2McastSnoopingIgmpQueriesV2FramesProcessed	1.3.6.1.4.1.248.11.33.1.3.1.3	Counter32	read-only	IGMP queries version 2 processed by CPU. The number of multicast control frames that have been processed by the CPU.
C32 hm2L2McastSnoopingIgmpQueriesV3FramesProcessed	1.3.6.1.4.1.248.11.33.1.3.1.4	Counter32	read-only	IGMP queries version 3 processed by CPU. The number of multicast control frames that have been processed by the CPU.
C32 hm2L2McastSnoopingIgmpWrongVersionQueries	1.3.6.1.4.1.248.11.33.1.3.1.5	Counter32	read-only	The number of general queries received whose IGMP version does not match the equivalent hm2AgentSwitchSnoopingQuerierVersion.
C32 hm2L2McastSnoopingPimDvmrpFramesProcessed	1.3.6.1.4.1.248.11.33.1.3.1.6	Counter32	read-only	PIM or DVMRP frames processed by CPU. The number of multicast control frames that have been processed by the CPU.
hm2L2McastSnoopingStatisticsTable	1.3.6.1.4.1.248.11.33.1.3.1.10		not-accessible	A table for multicast control frames that have been processed by the CPU.
hm2L2McastSnoopingStatisticsEntry	1.3.6.1.4.1.248.11.33.1.3.1.10.1		not-accessible	A table for multicast control frames that have been processed by the CPU. An entry appears in this table for any physical interfaces.
C32 hm2L2McastSnoopingIntfIgmpReportsFramesProcessed	1.3.6.1.4.1.248.11.33.1.3.1.10.1.2	Counter32	read-only	IGMP reports, joins or leaves processed by CPU and received on the interface. The number of multicast control frames that have been processed by the CPU.
C32 hm2L2McastSnoopingIntfIgmpQueriesV1FramesProcessed	1.3.6.1.4.1.248.11.33.1.3.1.10.1.3	Counter32	read-only	IGMP queries version 1 processed by CPU and received on the interface. The number of multicast control frames that have been processed by the CPU.
C32 hm2L2McastSnoopingIntfIgmpQueriesV2FramesProcessed	1.3.6.1.4.1.248.11.33.1.3.1.10.1.4	Counter32	read-only	IGMP queries version 2 processed by CPU and received on the interface. The number of multicast control frames that have been processed by the CPU.
C32 hm2L2McastSnoopingIntfIgmpQueriesV3FramesProcessed	1.3.6.1.4.1.248.11.33.1.3.1.10.1.5	Counter32	read-only	IGMP queries version 3 processed by CPU and received on the interface. The number of multicast control frames that have been processed by the CPU.
C32 hm2L2McastSnoopingIntfIgmpWrongVersionQueries	1.3.6.1.4.1.248.11.33.1.3.1.10.1.6	Counter32	read-only	The number of general queries received whose IGMP version does not match the equivalent hm2AgentSwitchSnoopingQuerierVersion.
C32 hm2L2McastSnoopingIntfPimDvmrpFramesProcessed	1.3.6.1.4.1.248.11.33.1.3.1.10.1.7	Counter32	read-only	PIM or DVMRP frames processed by CPU and received on the interface. The number of multicast control frames that have been processed by the CPU.
hm2L2McastSNMPExtensionGroup	1.3.6.1.4.1.248.11.33.3
hm2L2McastGroupMembershipErrorReturn	1.3.6.1.4.1.248.11.33.3.1			Indicates that Max Response Time is greater than the Group Membership Interval

RFC description

Vendor-private MIB for Hirschmann/Belden layer 2 multicast management; defines objects for VLAN, spanning tree, and multicast group administration.

Start monitoring Hirschmann HiOS industrial Ethernet switch (IGMP/MLD snooping) 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 HM2-L2MCAST-MIB