MGMD-STD-MIB

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Organization: INTERNET ENGINEERING TASK FORCE MULTICAST and ANYCAST GROUP MEMBERSHIP Working Group. www: http://www.ietf.org/html.charters/magma-charter.html EMail: magma@ietf.org

Last Updated: 2009-03-30

Category: IP and Core Protocols, Routing Protocols

Description: Defines managed objects for Multicast Group Membership Discovery, providing unified management of both IGMP (IPv4) and MLD (IPv6) multicast protocols.

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

What Is MGMD-STD-MIB?

MGMD-STD-MIB is a vendor-neutral IETF standards-track module (updating RFC 2933/RFC 3019) that unifies management of Multicast Group Membership Discovery protocols, covering both IGMP for IPv4 and MLD for IPv6, including their v2/v3 source-filtering extensions, and because the MGMD-STD-MIB MIB consolidates what were previously separate IGMP- and MLD-specific modules, vendors need only implement one standards-track module to cover both protocol families. It exposes per-interface multicast configuration and state, split into host-side objects (querier presence, querier version, query timers, robustness) and router-side interface objects tracking multicast group membership. As a protocol-state MIB it is used mainly for operational/configuration monitoring rather than hardware health, letting an operator confirm interface status, which IGMP/MLD version is active, and how a device is behaving as a querier versus non-querier. It has no dependency on proprietary MIBs but is closely tied to the underlying IGMP/MLD RFCs it consolidates and to related IETF multicast-routing MIBs. It is typically deployed on IP routers and multicast-aware Layer 3 switches across any vendor to verify correct multicast membership discovery behavior on each interface.

IPNetwork Monitor allows you to monitor SNMP objects defined in MGMD-STD-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
IP routers and Layer 3 switches supporting IGMP/MLD multicast

Monitoring Examples

An operator would poll mgmdHostInterfaceTable/mgmdHostInterfaceEntry, checking mgmdHostInterfaceQuerierType and mgmdHostInterfaceQuerier to confirm which device on a LAN segment is the active IGMP/MLD querier, and mgmdHostInterfaceVersion to verify all hosts are running the expected protocol version. Anomalies surfaced via mgmdHostInterfaceVersion1QuerierTimer/mgmdHostInterfaceVersion2QuerierTimer can reveal a misconfigured device disrupting multicast delivery. mgmdRouterInterfaceTable would similarly be polled on the router side to confirm the interface is correctly tracking downstream multicast group membership.

What Can Be Monitored

active IGMP/MLD querier per interface
IGMP/MLD protocol version in use
querier timers (v1/v2)
robustness variable (v3)
host/router interface multicast status

Imported Objects

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero

From INET-ADDRESS-MIB

InetAddress
InetAddressType

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks
Unsigned32
mib-2

From SNMPv2-TC

RowStatus

How to Use in IPNetwork Monitor

Example using mgmdHostCacheUpTime OID:

Select an IP router or Layer 3 switch with IGMP/MLD multicast support 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 mgmdHostCacheUpTime into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. It reports how long this IGMP/MLD host cache entry has existed. 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 TimeTicks-type OID, Value bounds is the most useful condition here — trigger an alert if the value resets to a low number unexpectedly for an entry you expect to be stable, since that indicates the membership state was relearned. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
mgmdHostBaseMIBGroup	1.3.6.1.2.1.185.2.2.1			The basic collection of objects providing management of MGMD version 1, 2, or 3 for hosts.
IP mgmdHostCacheAddress	1.3.6.1.2.1.185.1.3.1.2	InetAddress	not-accessible	The IP multicast group address for which this entry contains information. The InetAddressType, e.g., IPv4 or IPv6, is identified by the mgmdHostCacheAddressType variable in the mgmdHostCache table.
IPt mgmdHostCacheAddressType	1.3.6.1.2.1.185.1.3.1.1	InetAddressType	not-accessible	The address type of the mgmdHostCacheTable entry. This value applies to both the mgmdHostCacheAddress and the mgmdHostCacheLastReporter entries.
mgmdHostCacheEntry	1.3.6.1.2.1.185.1.3.1		not-accessible	An entry (conceptual row) in the mgmdHostCacheTable.
NUM mgmdHostCacheIfIndex	1.3.6.1.2.1.185.1.3.1.3	InterfaceIndex	not-accessible	The interface for which this entry contains information for an IP multicast group address.
IP mgmdHostCacheLastReporter	1.3.6.1.2.1.185.1.3.1.5	InetAddress	read-only	The IP address of the source of the last membership report received for this IP multicast group address on this interface. If no membership report has been received, this object has a value of 0. The InetAddressType, e.g., IPv4 or IPv6, is identified by the mgmdHostCacheAddressType variable in the mgmdHostCache table.
INT mgmdHostCacheSourceFilterMode	1.3.6.1.2.1.185.1.3.1.6	INTEGER	read-only	The state in which the interface is currently set. The value indicates the relevance of the corresponding source list entries in the mgmdHostSecListTable for MGMDv3 interfaces.
mgmdHostCacheTable	1.3.6.1.2.1.185.1.3		not-accessible	The (conceptual) table listing the IP multicast groups for which the host is a member on a particular interface.
TIK mgmdHostCacheUpTimeEx	1.3.6.1.2.1.185.1.3.1.4	TimeTicks	read-only	The time elapsed since this entry was created.
mgmdHostExtendedMIBGroup	1.3.6.1.2.1.185.2.2.4			A collection of optional objects for MGMD hosts.
mgmdHostInterfaceEntry	1.3.6.1.2.1.185.1.1.1		not-accessible	An entry (conceptual row) representing an interface on which IGMP or MLD is enabled.
NUM mgmdHostInterfaceIfIndex	1.3.6.1.2.1.185.1.1.1.1	InterfaceIndex	not-accessible	The ifIndex value of the interface for which IGMP or MLD is enabled. The table is indexed by the ifIndex value and the InetAddressType to allow for interfaces that may be configured in both IPv4 and IPv6 modes.
IP mgmdHostInterfaceQuerier	1.3.6.1.2.1.185.1.1.1.3	InetAddress	read-only	The address of the IGMP or MLD Querier on the IP subnet to which this interface is attached. The InetAddressType, e.g., IPv4 or IPv6, is identified by the mgmdHostInterfaceQuerierType variable in the mgmdHostInterface table.
IPt mgmdHostInterfaceQuerierType	1.3.6.1.2.1.185.1.1.1.2	InetAddressType	not-accessible	The address type of this interface. This entry along with the ifIndex value acts as an index to the mgmdHostInterface table. A physical interface may be configured in multiple modes concurrently, e.g., in IPv4 and IPv6 modes connected to the same interface; however, the traffic is considered to be logically separate.
ROW mgmdHostInterfaceStatus	1.3.6.1.2.1.185.1.1.1.4	RowStatus	read-create	The activation of a row enables the host side of IGMP or MLD on the interface. The destruction of a row disables the host side of IGMP or MLD on the interface.
mgmdHostInterfaceTable	1.3.6.1.2.1.185.1.1		not-accessible	The (conceptual) table listing the interfaces on which IGMP or MLD is enabled.
U32 mgmdHostInterfaceVersion	1.3.6.1.2.1.185.1.1.1.5	Unsigned32	read-create	The maximum version of MGMD that the host can run on this interface. A value of 1 is only applicable for IPv4, and indicates that the host only supports IGMPv1 on the interface. A value of 2 indicates that the host also supports IGMPv2 (for IPv4) or MLDv1 (for IPv6). A value of 3 indicates that the host also supports IGMPv3 (for IPv4) or MLDv2 (for IPv6).
TIK mgmdHostInterfaceVersion1QuerierTimer	1.3.6.1.2.1.185.1.1.1.6	TimeTicks	read-only	The time remaining until the host assumes that there are no IGMPv1 routers present on the interface. While this is non-zero, the host will reply to all queries with version 1 membership reports. This variable applies to IGMPv2 or 3 hosts that are forced to run in v1 for compatibility with v1 routers present on the interface. This object may only be present when the corresponding value of mgmdHostInterfaceQuerierType is ipv4.
TIK mgmdHostInterfaceVersion2QuerierTimer	1.3.6.1.2.1.185.1.1.1.7	TimeTicks	read-only	The time remaining until the host assumes that there are no MGMDv2 routers present on the interface. While this is non-zero, the host will reply to all queries with version 1 or 2 membership reports. This variable applies to MGMDv3 hosts that are forced to run in v2 for compatibility with v2 hosts or routers present on the interface.
U32 mgmdHostInterfaceVersion3Robustness	1.3.6.1.2.1.185.1.1.1.8	Unsigned32	read-create	The robustness variable utilised by an MGMDv3 host in sending state-change reports for multicast routers. To ensure the state-change report is not missed, the host retransmits the state-change report [mgmdHostInterfaceVersion3Robustness - 1] times. The variable must be a non-zero value.
IP mgmdHostSrcListAddress	1.3.6.1.2.1.185.1.7.1.2	InetAddress	not-accessible	The IP multicast group address for which this entry contains information.
IPt mgmdHostSrcListAddressType	1.3.6.1.2.1.185.1.7.1.1	InetAddressType	not-accessible	The address type of the InetAddress variables in this table. This value applies to the mgmdHostSrcListHostAddress and mgmdHostSrcListAddress entries.
mgmdHostSrcListEntry	1.3.6.1.2.1.185.1.7.1		not-accessible	An entry (conceptual row) in the mgmdHostSrcListTable.
TIK mgmdHostSrcListExpire	1.3.6.1.2.1.185.1.7.1.5	TimeTicks	read-only	This value indicates the relevance of the SrcList entry, whereby a non-zero value indicates this is an INCLUDE state value, and a zero value indicates this to be an EXCLUDE state value.
IP mgmdHostSrcListHostAddress	1.3.6.1.2.1.185.1.7.1.4	InetAddress	not-accessible	The host address to which this entry corresponds. The mgmdHostCacheSourceFilterMode value for this group address and interface indicates whether this host address is included or excluded.
NUM mgmdHostSrcListIfIndex	1.3.6.1.2.1.185.1.7.1.3	InterfaceIndex	not-accessible	The interface for which this entry contains information for an IP multicast group address.
mgmdHostSrcListTable	1.3.6.1.2.1.185.1.7		not-accessible	The (conceptual) table listing the Source List entries corresponding to each interface and multicast group pair on a host.
mgmdIgmpV1HostReadMIBCompliance	1.3.6.1.2.1.185.2.1.1			A read-only compliance statement for hosts running IGMPv1 [RFC1112] and implementing the MGMD MIB. IGMPv1 hosts must support the IPv4 address type.
mgmdIgmpV1RouterReadMIBCompliance	1.3.6.1.2.1.185.2.1.2			A read-only compliance statement for routers running IGMPv1 [RFC1112] and implementing the MGMD MIB. IGMPv1 routers only support the IPv4 address type. Non-accessible index objects that only need IPv4 support are: OBJECT mgmdRouterCacheAddressType SYNTAX InetAddressType { ipv4(1) } OBJECT mgmdRouterCacheAddress SYNTAX InetAddress (SIZE(4)) OBJECT mgmdRouterInterfaceQuerierType SYNTAX InetAddressType { ipv4(1) } OBJECT mgmdInverseRouterCacheAddressType SYNTAX InetAddressType { ipv4(1) }
mgmdIgmpV1RouterWriteMIBCompliance	1.3.6.1.2.1.185.2.1.3			A read-create compliance statement for routers running IGMPv1 [RFC1112] and implementing the MGMD MIB. IGMPv1 routers only support the IPv4 address type. Non-accessible index objects that only need IPv4 support are: OBJECT mgmdRouterCacheAddressType SYNTAX InetAddressType { ipv4(1) } OBJECT mgmdRouterCacheAddress SYNTAX InetAddress (SIZE(4)) OBJECT mgmdRouterInterfaceQuerierType SYNTAX InetAddressType { ipv4(1) } OBJECT mgmdInverseRouterCacheAddressType SYNTAX InetAddressType { ipv4(1) }
mgmdIgmpV2MldV1HostReadMIBCompliance	1.3.6.1.2.1.185.2.1.4			A read-only compliance statement for hosts running IGMPv2 [RFC2236] or MLDv1 [RFC2710] and implementing the MGMD MIB. IGMPv2 hosts only support the IPv4 address type and MLDv1 hosts only support the IPv6 address type.
mgmdIgmpV2MldV1HostWriteMIBCompliance	1.3.6.1.2.1.185.2.1.5			A read-create compliance statement for hosts running IGMPv2 [RFC2236] or MLDv1 [RFC2710] and implementing the MGMD MIB. IGMPv2 hosts only support the IPv4 address type and MLDv1 hosts only support the IPv6 address type.
mgmdIgmpV2MldV1RouterReadMIBCompliance	1.3.6.1.2.1.185.2.1.6			A read-only compliance statement for routers running IGMPv2 [RFC2236] or MLDv1 [RFC2710] and implementing the MGMD MIB. IGMPv2 routers only support the IPv4 address type and MLDv1 routers only support the IPv6 address type.
mgmdIgmpV2V3MldV1V2RouterWriteMIBCompliance	1.3.6.1.2.1.185.2.1.7			A read-create compliance statement for routers running IGMPv2 [RFC2236], IGMPv3 [RFC3376], MLDv1 [RFC2710], or MLDv2 [RFC3810] and implementing the MGMD MIB. IGMPv2 and IGMPv3 routers only support the IPv4 address type, while MLDv1 and MLDv2 routers only support the IPv6 address type.
mgmdIgmpV3MldV2HostReadMIBCompliance	1.3.6.1.2.1.185.2.1.8			The compliance statement for hosts running IGMPv3 [RFC3376] or MLDv2 [RFC3810] and implementing the MGMD MIB. IGMPv3 hosts only support the IPv4 address type and MLDv2 hosts only support the IPv6 address type.
mgmdIgmpV3MldV2HostWriteMIBCompliance	1.3.6.1.2.1.185.2.1.9			The compliance statement for hosts running IGMPv3 [RFC3376] or MLDv2 [RFC3810] and implementing the MGMD MIB. IGMPv3 hosts only support the IPv4 address type and MLDv2 hosts only support the IPv6 address type.
mgmdIgmpV3MldV2RouterReadMIBCompliance	1.3.6.1.2.1.185.2.1.10			A read-only compliance statement for routers running IGMPv3 [RFC3376] or MLDv2 [RFC3810] and implementing the MGMD MIB. IGMPv3 routers only support the IPv4 address type and MLDv2 routers only support the IPv6 address type.
IP mgmdInverseHostCacheAddress	1.3.6.1.2.1.185.1.5.1.3	InetAddress	read-only	The IP multicast group address for which this entry contains information about an interface. The InetAddressType, e.g., IPv4 or IPv6, is identified by the mgmdInverseHostCacheAddressType variable in the mgmdInverseHostCache table.
IPt mgmdInverseHostCacheAddressType	1.3.6.1.2.1.185.1.5.1.2	InetAddressType	not-accessible	The address type of the mgmdInverseHostCacheTable entry.
mgmdInverseHostCacheEntry	1.3.6.1.2.1.185.1.5.1		not-accessible	An entry (conceptual row) in the mgmdInverseHostCacheTable.
NUM mgmdInverseHostCacheIfIndex	1.3.6.1.2.1.185.1.5.1.1	InterfaceIndex	not-accessible	The interface for which this entry contains information.
mgmdInverseHostCacheTable	1.3.6.1.2.1.185.1.5		not-accessible	The (conceptual) table listing the interfaces that are members of a particular group. This is an inverse lookup table for entries in the mgmdHostCacheTable.
IP mgmdInverseRouterCacheAddress	1.3.6.1.2.1.185.1.6.1.3	InetAddress	read-only	The IP multicast group address for which this entry contains information. The InetAddressType, e.g., IPv4 or IPv6, is identified by the mgmdInverseRouterCacheAddressType variable in the mgmdInverseRouterCache table.
IPt mgmdInverseRouterCacheAddressType	1.3.6.1.2.1.185.1.6.1.2	InetAddressType	not-accessible	The address type of the mgmdInverseRouterCacheTable entry.
mgmdInverseRouterCacheEntry	1.3.6.1.2.1.185.1.6.1		not-accessible	An entry (conceptual row) in the mgmdInverseRouterCacheTable.
NUM mgmdInverseRouterCacheIfIndex	1.3.6.1.2.1.185.1.6.1.1	InterfaceIndex	not-accessible	The interface for which this entry contains information for an IP multicast group address.
mgmdInverseRouterCacheTable	1.3.6.1.2.1.185.1.6		not-accessible	The (conceptual) table listing the interfaces that are members of a particular group. This is an inverse lookup table for entries in the mgmdRouterCacheTable.
mgmdMIBCompliance	1.3.6.1.2.1.185.2.1
mgmdMIBConformance	1.3.6.1.2.1.185.2
mgmdMIBGroups	1.3.6.1.2.1.185.2.2
mgmdMIBObjects	1.3.6.1.2.1.185.1
mgmdRouterBaseMIBGroup	1.3.6.1.2.1.185.2.2.2			The basic collection of objects providing management of MGMD version 1, 2, or 3 for routers.
IP mgmdRouterCacheAddress	1.3.6.1.2.1.185.1.4.1.2	InetAddress	not-accessible	The IP multicast group address for which this entry contains information. The InetAddressType, e.g., IPv4 or IPv6, is identified by the mgmdRouterCacheAddressType variable in the mgmdRouterCache table.
IPt mgmdRouterCacheAddressType	1.3.6.1.2.1.185.1.4.1.1	InetAddressType	not-accessible	The address type of the mgmdRouterCacheTable entry. This value applies to both the mgmdRouterCacheAddress and the mgmdRouterCacheLastReporter entries.
mgmdRouterCacheEntry	1.3.6.1.2.1.185.1.4.1		not-accessible	An entry (conceptual row) in the mgmdRouterCacheTable.
TIK mgmdRouterCacheExcludeModeExpiryTimer	1.3.6.1.2.1.185.1.4.1.7	TimeTicks	read-only	This value is applicable only to MGMDv3-compatible nodes and represents the time remaining before the interface EXCLUDE state expires and the interface state transitions to INCLUDE mode. This value can never be greater than mgmdRouterCacheExpiryTime.
TIK mgmdRouterCacheExpiryTime	1.3.6.1.2.1.185.1.4.1.6	TimeTicks	read-only	This value represents the time remaining before the Group Membership Interval state expires. The value must always be greater than or equal to 1.
NUM mgmdRouterCacheIfIndex	1.3.6.1.2.1.185.1.4.1.3	InterfaceIndex	not-accessible	The interface for which this entry contains information for an IP multicast group address.
IP mgmdRouterCacheLastReporter	1.3.6.1.2.1.185.1.4.1.4	InetAddress	read-only	The IP address of the source of the last membership report received for this IP multicast group address on this interface. If no membership report has been received, this object has the value 0. The InetAddressType, e.g., IPv4 or IPv6, is identified by the mgmdRouterCacheAddressType variable in the mgmdRouterCache table.
INT mgmdRouterCacheSourceFilterMode	1.3.6.1.2.1.185.1.4.1.10	INTEGER	read-only	The current cache state, applicable to MGMDv3-compatible nodes. The value indicates whether the state is INCLUDE or EXCLUDE.
mgmdRouterCacheTable	1.3.6.1.2.1.185.1.4		not-accessible	The (conceptual) table listing the IP multicast groups for which there are members on a particular router interface.
TIK mgmdRouterCacheUpTime	1.3.6.1.2.1.185.1.4.1.5	TimeTicks	read-only	The time elapsed since this entry was created.
TIK mgmdRouterCacheVersion1HostTimer	1.3.6.1.2.1.185.1.4.1.8	TimeTicks	read-only	The time remaining until the local router will assume that there are no longer any MGMD version 1 members on the IP subnet attached to this interface. This entry only applies to IGMPv1 hosts, and is not implemented for MLD. Upon hearing any MGMDv1 Membership Report (IGMPv1 only), this value is reset to the group membership timer. While this time remaining is non-zero, the local router ignores any MGMDv2 Leave messages (IGMPv2 only) for this group that it receives on this interface.
TIK mgmdRouterCacheVersion2HostTimer	1.3.6.1.2.1.185.1.4.1.9	TimeTicks	read-only	The time remaining until the local router will assume that there are no longer any MGMD version 2 members on the IP subnet attached to this interface. This entry applies to both IGMP and MLD hosts. Upon hearing any MGMDv2 Membership Report, this value is reset to the group membership timer. Assuming no MGMDv1 hosts have been detected, the local router does not ignore any MGMDv2 Leave messages for this group that it receives on this interface.
mgmdRouterInterfaceEntry	1.3.6.1.2.1.185.1.2.1		not-accessible	An entry (conceptual row) representing an interface on which IGMP or MLD is enabled.
G32 mgmdRouterInterfaceGroups	1.3.6.1.2.1.185.1.2.1.13	Gauge32	read-only	The current number of entries for this interface in the mgmdRouterCacheTable.
NUM mgmdRouterInterfaceIfIndex	1.3.6.1.2.1.185.1.2.1.1	InterfaceIndex	not-accessible	The ifIndex value of the interface for which IGMP or MLD is enabled. The table is indexed by the ifIndex value and the InetAddressType to allow for interfaces that may be configured in both IPv4 and IPv6 modes.
C32 mgmdRouterInterfaceJoins	1.3.6.1.2.1.185.1.2.1.11	Counter32	read-only	The number of times a group membership has been added on this interface, that is, the number of times an entry for this interface has been added to the Cache Table. This object can give an indication of the amount of activity between samples over time.
U32 mgmdRouterInterfaceLastMemberQueryCount	1.3.6.1.2.1.185.1.2.1.16	Unsigned32	read-only	Represents the number of group-specific and group-and- source-specific queries sent by the router before it assumes there are no local members.
U32 mgmdRouterInterfaceLastMemberQueryInterval	1.3.6.1.2.1.185.1.2.1.15	Unsigned32	read-create	The Last Member Query Interval is the Max Query Response Interval inserted into group-specific queries sent in response to leave group messages, and is also the amount of time between group-specific query messages. This value may be tuned to modify the leave latency of the network. A reduced value results in reduced time to detect the loss of the last member of a group. The value of this object is irrelevant if mgmdRouterInterfaceVersion is 1.
NUM mgmdRouterInterfaceProxyIfIndex	1.3.6.1.2.1.185.1.2.1.12	InterfaceIndexOrZero	read-create	Some devices implement a form of IGMP or MLD proxying whereby memberships learned on the interface represented by this row cause Host Membership Reports to be sent on the interface whose ifIndex value is given by this object. Such a device would implement the mgmdV2RouterBaseMIBGroup only on its router interfaces (those interfaces with non-zero mgmdRouterInterfaceProxyIfIndex). Typically, the value of this object is 0, indicating that no proxying is being done.
IP mgmdRouterInterfaceQuerier	1.3.6.1.2.1.185.1.2.1.3	InetAddress	read-only	The address of the IGMP or MLD Querier on the IP subnet to which this interface is attached. The InetAddressType, e.g., IPv4 or IPv6, is identified by the mgmdRouterInterfaceQuerierType variable in the mgmdRouterInterface table.
TIK mgmdRouterInterfaceQuerierExpiryTime	1.3.6.1.2.1.185.1.2.1.9	TimeTicks	read-only	The amount of time remaining before the Other Querier Present Timer expires. If the local system is the querier, the value of this object is zero.
IPt mgmdRouterInterfaceQuerierType	1.3.6.1.2.1.185.1.2.1.2	InetAddressType	not-accessible	The address type of this interface. This entry along with the ifIndex value acts as the index to the mgmdRouterInterface table. A physical interface may be configured in multiple modes concurrently, e.g., in IPv4 and IPv6 modes connected to the same interface; however, the traffic is considered to be logically separate.
TIK mgmdRouterInterfaceQuerierUpTimeEx	1.3.6.1.2.1.185.1.2.1.8	TimeTicks	read-only	The time since mgmdRouterInterfaceQuerier was last changed.
U32 mgmdRouterInterfaceQueryInterval	1.3.6.1.2.1.185.1.2.1.4	Unsigned32	read-create	The frequency at which IGMP or MLD Host-Query packets are transmitted on this interface.
U32 mgmdRouterInterfaceQueryMaxResponseTime	1.3.6.1.2.1.185.1.2.1.7	Unsigned32	read-create	The maximum query response interval advertised in MGMDv2 or IGMPv3 queries on this interface.
U32 mgmdRouterInterfaceRobustness	1.3.6.1.2.1.185.1.2.1.14	Unsigned32	read-create	The Robustness Variable allows tuning for the expected packet loss on a subnet. If a subnet is expected to be lossy, the Robustness Variable may be increased. IGMP and MLD are robust to (Robustness Variable-1) packet losses.
U32 mgmdRouterInterfaceStartupQueryCount	1.3.6.1.2.1.185.1.2.1.17	Unsigned32	read-only	Represents the number of Queries sent out on startup, separated by the Startup Query Interval.
U32 mgmdRouterInterfaceStartupQueryInterval	1.3.6.1.2.1.185.1.2.1.18	Unsigned32	read-only	This variable represents the interval between General Queries sent by a Querier on startup.
ROW mgmdRouterInterfaceStatus	1.3.6.1.2.1.185.1.2.1.5	RowStatus	read-create	The activation of a row enables the router side of IGMP or MLD on the interface. The destruction of a row disables the router side of IGMP or MLD on the interface.
mgmdRouterInterfaceTable	1.3.6.1.2.1.185.1.2		not-accessible	The (conceptual) table listing the interfaces on which IGMP or MLD is enabled.
U32 mgmdRouterInterfaceVersion	1.3.6.1.2.1.185.1.2.1.6	Unsigned32	read-create	The version of MGMD that is running on this interface. Value 1 applies to IGMPv1 routers only. Value 2 applies to IGMPv2 and MLDv1 routers, and value 3 applies to IGMPv3 and MLDv2 routers. This object can be used to configure a router capable of running either version. For IGMP and MLD to function correctly, all routers on a LAN must be configured to run the same version on that LAN.
C32 mgmdRouterInterfaceWrongVersionQueries	1.3.6.1.2.1.185.1.2.1.10	Counter32	read-only	The number of general queries received whose IGMP or MLD version does not match the equivalent mgmdRouterInterfaceVersion, over the lifetime of the row entry. Both IGMP and MLD require that all routers on a LAN be configured to run the same version. Thus, if any general queries are received with the wrong version, this indicates a configuration error.
IP mgmdRouterSrcListAddress	1.3.6.1.2.1.185.1.8.1.2	InetAddress	not-accessible	The IP multicast group address for which this entry contains information.
IPt mgmdRouterSrcListAddressType	1.3.6.1.2.1.185.1.8.1.1	InetAddressType	not-accessible	The address type of the InetAddress variables in this table. This value applies to the mgmdRouterSrcListHostAddress and mgmdRouterSrcListAddress entries.
mgmdRouterSrcListEntry	1.3.6.1.2.1.185.1.8.1		not-accessible	An entry (conceptual row) in the mgmdRouterSrcListTable.
TIK mgmdRouterSrcListExpire	1.3.6.1.2.1.185.1.8.1.5	TimeTicks	read-only	This value indicates the relevance of the SrcList entry, whereby a non-zero value indicates this is an INCLUDE state value, and a zero value indicates this to be an EXCLUDE state value.
IP mgmdRouterSrcListHostAddress	1.3.6.1.2.1.185.1.8.1.4	InetAddress	not-accessible	The host address to which this entry corresponds. The mgmdRouterCacheSourceFilterMode value for this group address and interface indicates whether this host address is included or excluded.
NUM mgmdRouterSrcListIfIndex	1.3.6.1.2.1.185.1.8.1.3	InterfaceIndex	not-accessible	The interface for which this entry contains information for an IP multicast group address.
mgmdRouterSrcListTable	1.3.6.1.2.1.185.1.8		not-accessible	The (conceptual) table listing the Source List entries corresponding to each interface and multicast group pair on a Router.
mgmdStdMIB	1.3.6.1.2.1.185			The MIB module for MGMD management. A new version of MGMD combining RFC 2933 and RFC 3019. Includes IGMPv3 and MLDv2 source filtering changes. Copyright (c) 2009 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - Neither the name of Internet Society, IETF or IETF Trust, nor the names of specific contributors, may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. This version of this MIB module is part of RFC 5519; see the RFC itself for full legal notices.
mgmdV2HostMIBGroup	1.3.6.1.2.1.185.2.2.3			A collection of additional read-only objects for management of IGMP version 2 in hosts for MGMD version 2 compliance.
mgmdV2ProxyMIBGroup	1.3.6.1.2.1.185.2.2.6			A collection of additional read-create objects for management of MGMD proxy devices.
mgmdV2RouterBaseMIBGroup	1.3.6.1.2.1.185.2.2.5			A collection of additional read-only objects for management of MGMD version 2 in routers.
mgmdV3HostMIBGroup	1.3.6.1.2.1.185.2.2.7			A collection of additional objects for management of MGMD version 3 in hosts.
mgmdV3RouterMIBGroup	1.3.6.1.2.1.185.2.2.8			A collection of additional read-only objects for management of MGMD version 3 in routers.

FAQ

What does MGMD-STD-MIB monitor, and how does it differ from separate IGMP/MLD MIBs?
It unifies management of Multicast Group Membership Discovery for both IGMP (IPv4) and MLD (IPv6), including their v2/v3 source-filtering extensions, exposing host-side objects like querier presence, querier version, query timers, and robustness, plus router-side interface objects tracking multicast group membership.

How would an operator use this MIB to verify multicast behavior on a Layer 3 switch?
An operator polls which IGMP/MLD version is active per interface, checks querier timers and the robustness variable, and confirms whether the device is acting as a querier or non-querier, letting them verify correct multicast membership discovery behavior across any vendor's IP routers or multicast-aware Layer 3 switches.

RFC description

Defines MGMD (Multicast and Anycast Group Membership Distribution) management objects combining RFC 2933 and RFC 3019, supporting IGMPv3 and MLDv2 source filtering.

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