IPMROUTE-STD-MIB

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Organization: IETF IDMR Working Group

Last Updated: 2000-09-22

Category: Routing Protocols

Description: Manages IPv4 multicast routing tables and next-hop information, independent of the specific multicast routing protocol in use.

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

What Is IPMROUTE-STD-MIB?

IPMROUTE-STD-MIB is a vendor-neutral IETF standards-track MIB (RFC 2932) for managing IP multicast routing information independent of which multicast routing protocol (PIM, DVMRP, etc.) is actually running. It exposes multicast route table data: active (S,G)/(*,G) entries, upstream neighbor and incoming interface for each route, and per-route packet counters. Rather than hardware health, its monitoring value is protocol/software status: whether multicast routing is enabled on the box, how many multicast route entries exist, how long each route has been up (uptime), when it will expire, and how many packets have flowed through it, which together reveal multicast forwarding health and churn. It is a companion MIB to protocol-specific multicast MIBs (PIM-MIB, DVMRP-MIB) and depends on IP-MIB/IF-MIB conventions for interface indexing, and network engineers troubleshooting a multicast issue often keep an IPMROUTE-STD-MIB reference beside those companion modules to see which object belongs to which layer. It is typically deployed on multicast-capable routers and Layer 3 switches in enterprise or service-provider networks running IPTV, financial market data feeds, or other multicast applications.

IPNetwork Monitor allows you to monitor SNMP objects defined in IPMROUTE-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 multicast-capable router or Layer 3 switch

Monitoring Examples

An administrator would poll ipMRouteTable/ipMRouteEntry, indexed by ipMRouteGroup and ipMRouteSource/ipMRouteSourceMask, to see which multicast groups are actively being forwarded and from which source. Watching ipMRouteUpTime and ipMRouteExpiryTime for a given entry reveals whether a multicast stream is stable or flapping (repeatedly expiring and re-joining), while ipMRoutePkts tracks forwarded packet volume for capacity or fault diagnosis. ipMRouteEntryCount gives a quick overall gauge of multicast routing table size, useful for spotting unexpected growth from a misbehaving source or routing loop. ipMRouteUpstreamNeighbor and ipMRouteInIfIndex help trace the reverse path for troubleshooting RPF failures.

What Can Be Monitored

multicast routing enabled state
number of active multicast routes
route uptime and expiry
upstream neighbor per route
incoming interface per route
packets forwarded per route

Imported Objects

From IANA-RTPROTO-MIB

IANAipMRouteProtocol
IANAipRouteProtocol

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
Gauge32
Integer32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks
mib-2

From SNMPv2-TC

RowStatus
TEXTUAL-CONVENTION
TruthValue

How to Use in IPNetwork Monitor

Example using ipMRouteNextHopClosestMemberHops OID:

Select a device implementing IPMROUTE-STD-MIB 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 ipMRouteNextHopClosestMemberHops 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 the minimum number of hops between this router and the nearest member of a given IP multicast group, reached via a specific next-hop. 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 an Integer32-type OID, Value bounds is the most useful condition here — trigger an alert if the hop count grows well beyond its normal baseline for that group, which can indicate a multicast routing topology problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ipMRoute	1.3.6.1.2.1.83.1.1
IP ipMRouteBoundaryAddress	1.3.6.1.2.1.83.1.1.5.1.2	IpAddress	not-accessible	The group address which when combined with the corresponding value of ipMRouteBoundaryAddressMask identifies the group range for which the scoped boundary exists. Scoped addresses must come from the range 239.x.x.x as specified in RFC 2365.
IP ipMRouteBoundaryAddressMask	1.3.6.1.2.1.83.1.1.5.1.3	IpAddress	not-accessible	The group address mask which when combined with the corresponding value of ipMRouteBoundaryAddress identifies the group range for which the scoped boundary exists.
ipMRouteBoundaryEntry	1.3.6.1.2.1.83.1.1.5.1		not-accessible	An entry (conceptual row) in the ipMRouteBoundaryTable representing a scoped boundary.
NUM ipMRouteBoundaryIfIndex	1.3.6.1.2.1.83.1.1.5.1.1	InterfaceIndex	not-accessible	The IfIndex value for the interface to which this boundary applies. Packets with a destination address in the associated address/mask range will not be forwarded out this interface.
ROW ipMRouteBoundaryStatus	1.3.6.1.2.1.83.1.1.5.1.4	RowStatus	read-create	The status of this row, by which new entries may be created, or old entries deleted from this table.
ipMRouteBoundaryTable	1.3.6.1.2.1.83.1.1.5		not-accessible	The (conceptual) table listing the router's scoped multicast address boundaries.
C32 ipMRouteDifferentInIfPackets	1.3.6.1.2.1.83.1.1.2.1.9	Counter32	read-only	The number of packets which this router has received from these sources and addressed to this multicast group address, which were dropped because they were not received on the interface indicated by ipMRouteInIfIndex. Packets which are not subject to an incoming interface check (e.g., using CBT) are not counted.
INT ipMRouteEnable	1.3.6.1.2.1.83.1.1.1	INTEGER	read-write	The enabled status of IP Multicast routing on this router.
ipMRouteEntry	1.3.6.1.2.1.83.1.1.2.1		not-accessible	An entry (conceptual row) containing the multicast routing information for IP datagrams from a particular source and addressed to a particular IP multicast group address. Discontinuities in counters in this entry can be detected by observing the value of ipMRouteUpTime.
G32 ipMRouteEntryCount	1.3.6.1.2.1.83.1.1.7	Gauge32	read-only	The number of rows in the ipMRouteTable. This can be used to monitor the multicast routing table size.
TIK ipMRouteExpiryTime	1.3.6.1.2.1.83.1.1.2.1.7	TimeTicks	read-only	The minimum amount of time remaining before this entry will be aged out. The value 0 indicates that the entry is not subject to aging.
IP ipMRouteGroup	1.3.6.1.2.1.83.1.1.2.1.1	IpAddress	not-accessible	The IP multicast group address for which this entry contains multicast routing information.
C64 ipMRouteHCOctets	1.3.6.1.2.1.83.1.1.2.1.16	Counter64	read-only	The number of octets contained in IP datagrams which were received from these sources and addressed to this multicast group address, and which were forwarded by this router. This object is a 64-bit version of ipMRouteOctets.
NUM ipMRouteInIfIndex	1.3.6.1.2.1.83.1.1.2.1.5	InterfaceIndexOrZero	read-only	The value of ifIndex for the interface on which IP datagrams sent by these sources to this multicast address are received. A value of 0 indicates that datagrams are not subject to an incoming interface check, but may be accepted on multiple interfaces (e.g., in CBT).
ipMRouteInterfaceEntry	1.3.6.1.2.1.83.1.1.4.1		not-accessible	An entry (conceptual row) containing the multicast routing information for a particular interface.
C64 ipMRouteInterfaceHCInMcastOctets	1.3.6.1.2.1.83.1.1.4.1.7	Counter64	read-only	The number of octets of multicast packets that have arrived on the interface, including framing characters. This object is a 64-bit version of ipMRouteInterfaceInMcastOctets. It is similar to ifHCInOctets in the Interfaces MIB, except that only multicast packets are counted.
C64 ipMRouteInterfaceHCOutMcastOctets	1.3.6.1.2.1.83.1.1.4.1.8	Counter64	read-only	The number of octets of multicast packets that have been sent on the interface. This object is a 64-bit version of ipMRouteInterfaceOutMcastOctets.
NUM ipMRouteInterfaceIfIndex	1.3.6.1.2.1.83.1.1.4.1.1	InterfaceIndex	not-accessible	The ifIndex value of the interface for which this entry contains information.
C32 ipMRouteInterfaceInMcastOctets	1.3.6.1.2.1.83.1.1.4.1.5	Counter32	read-only	The number of octets of multicast packets that have arrived on the interface, including framing characters. This object is similar to ifInOctets in the Interfaces MIB, except that only multicast packets are counted.
C32 ipMRouteInterfaceOutMcastOctets	1.3.6.1.2.1.83.1.1.4.1.6	Counter32	read-only	The number of octets of multicast packets that have been sent on the interface.
IAN ipMRouteInterfaceProtocol	1.3.6.1.2.1.83.1.1.4.1.3	IANAipMRouteProtocol	read-only	The routing protocol running on this interface.
I32 ipMRouteInterfaceRateLimit	1.3.6.1.2.1.83.1.1.4.1.4	Integer32	read-write	The rate-limit, in kilobits per second, of forwarded multicast traffic on the interface. A rate-limit of 0 indicates that no rate limiting is done.
ipMRouteInterfaceTable	1.3.6.1.2.1.83.1.1.4		not-accessible	The (conceptual) table containing multicast routing information specific to interfaces.
I32 ipMRouteInterfaceTtl	1.3.6.1.2.1.83.1.1.4.1.2	Integer32	read-write	The datagram TTL threshold for the interface. Any IP multicast datagrams with a TTL less than this threshold will not be forwarded out the interface. The default value of 0 means all multicast packets are forwarded out the interface.
ipMRouteMIBBasicGroup	1.3.6.1.2.1.83.2.2.1			A collection of objects to support basic management of IP Multicast routing.
ipMRouteMIBBoundaryGroup	1.3.6.1.2.1.83.2.2.3			A collection of objects to support management of scoped multicast address boundaries.
ipMRouteMIBCompliance	1.3.6.1.2.1.83.2.1.1			The compliance statement for the IP Multicast MIB.
ipMRouteMIBCompliances	1.3.6.1.2.1.83.2.1
ipMRouteMIBConformance	1.3.6.1.2.1.83.2
ipMRouteMIBGroups	1.3.6.1.2.1.83.2.2
ipMRouteMIBHCInterfaceGroup	1.3.6.1.2.1.83.2.2.5			A collection of objects providing information specific to high speed (greater than 20,000,000 bits/second) network interfaces.
ipMRouteMIBHopCountGroup	1.3.6.1.2.1.83.2.2.2			A collection of objects to support management of the use of hop counts in IP Multicast routing.
ipMRouteMIBObjects	1.3.6.1.2.1.83.1
ipMRouteMIBPktsGroup	1.3.6.1.2.1.83.2.2.7			A collection of objects to support management of packet counters for each forwarding entry.
ipMRouteMIBPktsOutGroup	1.3.6.1.2.1.83.2.2.4			A collection of objects to support management of packet counters for each outgoing interface entry of a route.
ipMRouteMIBRouteGroup	1.3.6.1.2.1.83.2.2.6			A collection of objects providing information on the relationship between multicast routing information, and the IP Forwarding Table.
IP ipMRouteNextHopAddress	1.3.6.1.2.1.83.1.1.3.1.5	IpAddress	not-accessible	The address of the next-hop specific to this entry. For most interfaces, this is identical to ipMRouteNextHopGroup. NBMA interfaces, however, may have multiple next-hop addresses out a single outgoing interface.
I32 ipMRouteNextHopClosestMemberHopsEx	1.3.6.1.2.1.83.1.1.3.1.9	Integer32	read-only	The minimum number of hops between this router and any member of this IP multicast group reached via this next-hop on this outgoing interface. Any IP multicast datagrams for the group which have a TTL less than this number of hops will not be forwarded to this next-hop.
ipMRouteNextHopEntry	1.3.6.1.2.1.83.1.1.3.1		not-accessible	An entry (conceptual row) in the list of next-hops on outgoing interfaces to which IP multicast datagrams from particular sources to a IP multicast group address are routed. Discontinuities in counters in this entry can be detected by observing the value of ipMRouteUpTime.
TIK ipMRouteNextHopExpiryTime	1.3.6.1.2.1.83.1.1.3.1.8	TimeTicks	read-only	The minimum amount of time remaining before this entry will be aged out. If ipMRouteNextHopState is pruned(1), the remaining time until the prune expires and the state reverts to forwarding(2). Otherwise, the remaining time until this entry is removed from the table. The time remaining may be copied from ipMRouteExpiryTime if the protocol in use for this entry does not specify next-hop timers. The value 0 indicates that the entry is not subject to aging.
IP ipMRouteNextHopGroup	1.3.6.1.2.1.83.1.1.3.1.1	IpAddress	not-accessible	The IP multicast group for which this entry specifies a next-hop on an outgoing interface.
NUM ipMRouteNextHopIfIndex	1.3.6.1.2.1.83.1.1.3.1.4	InterfaceIndex	not-accessible	The ifIndex value of the interface for the outgoing interface for this next-hop.
C32 ipMRouteNextHopPkts	1.3.6.1.2.1.83.1.1.3.1.11	Counter32	read-only	The number of packets which have been forwarded using this route.
IAN ipMRouteNextHopProtocol	1.3.6.1.2.1.83.1.1.3.1.10	IANAipMRouteProtocol	read-only	The routing mechanism via which this next-hop was learned.
IP ipMRouteNextHopSource	1.3.6.1.2.1.83.1.1.3.1.2	IpAddress	not-accessible	The network address which when combined with the corresponding value of ipMRouteNextHopSourceMask identifies the sources for which this entry specifies a next-hop on an outgoing interface.
IP ipMRouteNextHopSourceMask	1.3.6.1.2.1.83.1.1.3.1.3	IpAddress	not-accessible	The network mask which when combined with the corresponding value of ipMRouteNextHopSource identifies the sources for which this entry specifies a next-hop on an outgoing interface.
INT ipMRouteNextHopState	1.3.6.1.2.1.83.1.1.3.1.6	INTEGER	read-only	An indication of whether the outgoing interface and next- hop represented by this entry is currently being used to forward IP datagrams. The value 'forwarding' indicates it is currently being used; the value 'pruned' indicates it is not.
ipMRouteNextHopTable	1.3.6.1.2.1.83.1.1.3		not-accessible	The (conceptual) table containing information on the next- hops on outgoing interfaces for routing IP multicast datagrams. Each entry is one of a list of next-hops on outgoing interfaces for particular sources sending to a particular multicast group address.
TIK ipMRouteNextHopUpTimeEx	1.3.6.1.2.1.83.1.1.3.1.7	TimeTicks	read-only	The time since the multicast routing information represented by this entry was learned by the router.
C32 ipMRouteOctets	1.3.6.1.2.1.83.1.1.2.1.10	Counter32	read-only	The number of octets contained in IP datagrams which were received from these sources and addressed to this multicast group address, and which were forwarded by this router.
C32 ipMRoutePkts	1.3.6.1.2.1.83.1.1.2.1.8	Counter32	read-only	The number of packets which this router has received from these sources and addressed to this multicast group address.
IAN ipMRouteProtocol	1.3.6.1.2.1.83.1.1.2.1.11	IANAipMRouteProtocol	read-only	The multicast routing protocol via which this multicast forwarding entry was learned.
IP ipMRouteRtAddress	1.3.6.1.2.1.83.1.1.2.1.13	IpAddress	read-only	The address portion of the route used to find the upstream or parent interface for this multicast forwarding entry.
IP ipMRouteRtMask	1.3.6.1.2.1.83.1.1.2.1.14	IpAddress	read-only	The mask associated with the route used to find the upstream or parent interface for this multicast forwarding entry.
IAN ipMRouteRtProto	1.3.6.1.2.1.83.1.1.2.1.12	IANAipRouteProtocol	read-only	The routing mechanism via which the route used to find the upstream or parent interface for this multicast forwarding entry was learned. Inclusion of values for routing protocols is not intended to imply that those protocols need be supported.
INT ipMRouteRtType	1.3.6.1.2.1.83.1.1.2.1.15	INTEGER	read-only	The reason the given route was placed in the (logical) multicast Routing Information Base (RIB). A value of unicast means that the route would normally be placed only in the unicast RIB, but was placed in the multicast RIB (instead or in addition) due to local configuration, such as when running PIM over RIP. A value of multicast means that the route was explicitly added to the multicast RIB by the routing protocol, such as DVMRP or Multiprotocol BGP.
IP ipMRouteScopeNameAddress	1.3.6.1.2.1.83.1.1.6.1.1	IpAddress	not-accessible	The group address which when combined with the corresponding value of ipMRouteScopeNameAddressMask identifies the group range associated with the multicast scope. Scoped addresses must come from the range 239.x.x.x.
IP ipMRouteScopeNameAddressMask	1.3.6.1.2.1.83.1.1.6.1.2	IpAddress	not-accessible	The group address mask which when combined with the corresponding value of ipMRouteScopeNameAddress identifies the group range associated with the multicast scope.
T/F ipMRouteScopeNameDefault	1.3.6.1.2.1.83.1.1.6.1.5	TruthValue	read-create	If true, indicates a preference that the name in the following language should be used by applications if no name is available in a desired language.
ipMRouteScopeNameEntry	1.3.6.1.2.1.83.1.1.6.1		not-accessible	An entry (conceptual row) in the ipMRouteScopeNameTable representing a multicast scope name.
LAN ipMRouteScopeNameLanguage	1.3.6.1.2.1.83.1.1.6.1.3	LanguageTag	not-accessible	The RFC 1766-style language tag associated with the scope name.
ROW ipMRouteScopeNameStatus	1.3.6.1.2.1.83.1.1.6.1.6	RowStatus	read-create	The status of this row, by which new entries may be created, or old entries deleted from this table.
STR ipMRouteScopeNameString	1.3.6.1.2.1.83.1.1.6.1.4	SnmpAdminString	read-create	The textual name associated with the multicast scope. The value of this object should be suitable for displaying to end-users, such as when allocating a multicast address in this scope. When no name is specified, the default value of this object should be the string 239.x.x.x/y with x and y replaced appropriately to describe the address and mask length associated with the scope.
ipMRouteScopeNameTable	1.3.6.1.2.1.83.1.1.6		not-accessible	The (conceptual) table listing the multicast scope names.
IP ipMRouteSource	1.3.6.1.2.1.83.1.1.2.1.2	IpAddress	not-accessible	The network address which when combined with the corresponding value of ipMRouteSourceMask identifies the sources for which this entry contains multicast routing information.
IP ipMRouteSourceMask	1.3.6.1.2.1.83.1.1.2.1.3	IpAddress	not-accessible	The network mask which when combined with the corresponding value of ipMRouteSource identifies the sources for which this entry contains multicast routing information.
ipMRouteStdMIB	1.3.6.1.2.1.83			The MIB module for management of IP Multicast routing, but independent of the specific multicast routing protocol in use.
ipMRouteTable	1.3.6.1.2.1.83.1.1.2		not-accessible	The (conceptual) table containing multicast routing information for IP datagrams sent by particular sources to the IP multicast groups known to this router.
IP ipMRouteUpstreamNeighbor	1.3.6.1.2.1.83.1.1.2.1.4	IpAddress	read-only	The address of the upstream neighbor (e.g., RPF neighbor) from which IP datagrams from these sources to this multicast address are received, or 0.0.0.0 if the upstream neighbor is unknown (e.g., in CBT).
TIK ipMRouteUpTimeEx	1.3.6.1.2.1.83.1.1.2.1.6	TimeTicks	read-only	The time since the multicast routing information represented by this entry was learned by the router.

RFC description

IP Multicast Routing MIB (RFC 2932); defines objects for monitoring and managing IP multicast routing protocols and multicast forwarding state.

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