CISCOSB-MGMD-ROUTER-MIB

All MIBs › CISCOSB-MGMD-ROUTER-MIB

Organization: Cisco Systems, Inc.

Last Updated: 2011-07-21

Category: Routing Protocols, Vendor: RADLAN/Cisco SB

Description: Covers multicast group membership through MGMD (IGMP/MLD) router functionality on Cisco Small Business equipment.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) 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.

What Is CISCOSB-MGMD-ROUTER-MIB?

CISCOSB-MGMD-ROUTER-MIB is a Cisco Small Business private MIB for the Multicast Group Membership Discovery (MGMD) router function, i.e. IGMP/MLD multicast routing on SMB switches. It exposes per-interface extended statistics such as uptime, counts of IGMPv1/v2/v3 (and MLD) messages received, failed joins, invalid messages, and query messages sent. Its monitoring value is squarely performance/fault counters for multicast routing health—detecting failed joins, protocol version mismatches, or a flood of invalid messages that indicate multicast misconfiguration or a misbehaving host. It extends the standard IGMP/MLD multicast routing model (related to IETF's IGMP MIB) with Cisco-specific per-interface statistics. It is deployed on Cisco Small Business switches/routers acting as IGMP/MLD queriers in networks running IPTV or other multicast applications. Engineers can download the CISCOSB-MGMD-ROUTER-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCOSB-MGMD-ROUTER-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

Cisco Small Business switch/router

Monitoring Examples

An administrator would poll rlMgmdInterfaceExtTable/rlMgmdInterfaceExtEntry and read rlMgmdRouterInterfaceExtStatsUpTime alongside rlMgmdRouterInterfaceExtNumFailedJoins to see how long stats have accumulated and whether hosts are failing to join multicast groups. A rising rlMgmdRouterInterfaceExtNumInvalidMsgsRcvd count would flag malformed or unexpected IGMP/MLD traffic, while comparing rlMgmdRouterInterfaceExtNumIgmpV1Msgs versus V2/V3 counts helps identify legacy hosts still using older IGMP versions that could limit multicast efficiency.

What Can Be Monitored

per-interface IGMP/MLD message counts
failed multicast joins
invalid messages received
general/specific queries sent
interface uptime for multicast stats

Imported Objects

From CISCOSB-MIB

switch001

MODULE-IDENTITY

From CISCOSB-PIM-MIB

NpgOperStatus

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero

From INET-ADDRESS-MIB

InetAddress
InetAddressType

From MGMD-STD-MIB

mgmdRouterInterfaceEntry

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

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

From SNMPv2-TC

DisplayString
RowStatus
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
rlIgmp	1.3.6.1.4.1.9.6.1.101.225			The private MIB module definition for IGMP Router in CISCOSB devices.
rlMgmdInterfaceExtTable	1.3.6.1.4.1.9.6.1.101.225.1		not-accessible	The (conceptual) Extension Interface table listing the entries with counters of the standard interface table.
rlMgmdInterfaceExtEntry	1.3.6.1.4.1.9.6.1.101.225.1.1		not-accessible	An entry (conceptual row) in the rlMgmdInterfaceExtTable.
TIK rlMgmdRouterInterfaceExtStatsUpTime	1.3.6.1.4.1.9.6.1.101.225.1.1.1	TimeTicks	read-only	The time since the statistics counters for this interface were last reset. This field is reset to zero when rlMgmdRouterInterfaceExtEnableStats is modified to 'true'. This value may wrap.
T/F rlMgmdRouterInterfaceExtEnableStats	1.3.6.1.4.1.9.6.1.101.225.1.1.2	TruthValue	read-write	This object defines whether DC-IGMP returns interface-specific statistics on MIB GET operations for this interface's MIB row. If this object is modified from 'true' to 'false' and back to 'true', the statistics fields are reset. This field is readable and writeable.
U32 rlMgmdRouterInterfaceExtNumFailedJoins	1.3.6.1.4.1.9.6.1.101.225.1.1.3	Unsigned32	read-only	The number of failed joins received for this interface - that is, the number of times a group membership could not be added on this interface.
U32 rlMgmdRouterInterfaceExtNumIgmpV1Msgs	1.3.6.1.4.1.9.6.1.101.225.1.1.4	Unsigned32	read-only	The number of IGMPv1 messages received for this interface. This includes both valid and invalid messages.
U32 rlMgmdRouterInterfaceExtNumIgmpV2MldV1Msgs	1.3.6.1.4.1.9.6.1.101.225.1.1.5	Unsigned32	read-only	The number of IGMPv2 or Mldv1 messages received for this interface. This includes both valid and invalid messages.
U32 rlMgmdRouterInterfaceExtNumIgmpV3MldV2Msgs	1.3.6.1.4.1.9.6.1.101.225.1.1.6	Unsigned32	read-only	The number of IGMPv3 or Mldv2 messages received for this interface. This includes both valid and invalid messages.
U32 rlMgmdRouterInterfaceExtNumInvalidMsgsRcvd	1.3.6.1.4.1.9.6.1.101.225.1.1.7	Unsigned32	read-only	The number of Invalid IGMP or MLD messages received for this interface.
U32 rlMgmdRouterInterfaceExtNumGenQueriesSent	1.3.6.1.4.1.9.6.1.101.225.1.1.8	Unsigned32	read-only	The number of General Queries sent for this interface.
U32 rlMgmdRouterInterfaceExtNumSpecQueriesSent	1.3.6.1.4.1.9.6.1.101.225.1.1.9	Unsigned32	read-only	The number of Specific Queries sent for this interface.
U32 rlmgmdRouterInterfaceQrRobustness	1.3.6.1.4.1.9.6.1.101.225.1.1.10	Unsigned32	read-only	The value of Robustness in use on this interface. 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 is robust to (Robustness Variable-1) packet losses. For IGMPv3/MLDv2, this may differ from the value configured using mgmdRouterInterfaceRobustness if the local router is not the querier on this interface.
U32 rlmgmdRouterInterfaceQrQueryInterval	1.3.6.1.4.1.9.6.1.101.225.1.1.11	Unsigned32	read-only	The value of Query Interval in use on this interface. The frequency at which IGMP or MLD General Query packets are transmitted on this interface. For IGMPv3/MLDv2, this may differ from the value configured using mgmdRouterInterfaceQueryInterval if the local router is not the querier on this interface.
U32 rlmgmdRouterInterfaceQrQueryMaxResponseTime	1.3.6.1.4.1.9.6.1.101.225.1.1.12	Unsigned32	read-only	The value of Maximum Query Response Time in use on this interface. For IGMPv3/MLDv2, this may differ from the value configured using mgmdRouterInterfaceQueryMaxResponseTime if the local router is not the querier on this interface.
U32 rlmgmdRouterInterfaceQrLastMembQueryIntvl	1.3.6.1.4.1.9.6.1.101.225.1.1.13	Unsigned32	read-only	The value of Last Member Query Interval in use on this interface. The Last Member Query Interval is the Max Response Time inserted into Group-Specific and Group-and-Source-specific Queries sent in response to Leave messages, and is also the amount of time between successive 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. The value of this object is also irrelevant if this interface is configured to use immediate-leave behavior without a last member query - that is, if mgmdRouterInterfaceImmedtLeave is 'true' and mgmdRouterInterfaceQryBefImmdLv is 'false'. For IGMPv3/MLDv2, this may differ from the value configured using mgmdRouterInterfaceLastMembQueryIntvl if the local router is not the querier on this interface.
STR rlmgmdRouterInterfaceExtSrcAndGrpFilter	1.3.6.1.4.1.9.6.1.101.225.1.1.14	DisplayString	read-create	The interface will ignore requests to join any group/source pair that is not included in the extended access list with a list index corresponding to the value configured for this object. If the value of this object is 0, no requests are ignored as a result of this object. This object deprecates the dcmgmdRouterInterfaceAllowSSMList object. If both of these (S,G) filters are set to non-zero values, then both take effect for SSM groups - that is, a request to join an SSM group/source pair is only accepted if it passes through both filters. If both this object and the dcmgmdRouterInterfaceAllowASMList object are set to non-zero values, then a request to join an ASM group/source pair is only accepted if it passes through both filters.
ADM rlMgmdRouterInterfaceExtAdminStatus	1.3.6.1.4.1.9.6.1.101.225.1.1.15	AdminStatus	read-create	The desired administrative state of the interface.
NPG rlMgmdRouterInterfaceExtOperStatus	1.3.6.1.4.1.9.6.1.101.225.1.1.16	NpgOperStatus	read-only	The current operational state of the interface.
T/F rlMgmdRouterInterfaceExtIsQuerier	1.3.6.1.4.1.9.6.1.101.225.1.1.17	TruthValue	read-only	???
INT rlMgmdRouterInterfaceExtProxyDownProtected	1.3.6.1.4.1.9.6.1.101.225.1.1.18	INTEGER	read-write	Enable/Disable IGMP Proxy Downstream protected on the interface.

RFC description

Manages Cisco Small Business MGMD (IGMP/MLD) router functionality for multicast group membership.

Start monitoring Cisco Small Business switch/router 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 CISCOSB-MGMD-ROUTER-MIB

What Is CISCOSB-MGMD-ROUTER-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description