MULTIBRIDGE-MIB

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Organization: Newbridge Networks Corporation

Last Updated: 1997-03-25

Category: Bridging, STP/RSTP

Description: Manages Newbridge Networks multi-bridge configuration and spanning tree state.

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What Is MULTIBRIDGE-MIB?

MULTIBRIDGE-MIB is a Newbridge Networks enterprise MIB for managing nodes that implement more than one bridge entity, covering multi-bridge configuration and spanning tree state across those bridge instances. It exposes objects describing each bridge entity's configuration and its spanning-tree operational parameters on a device that hosts multiple independent bridging domains. Its monitoring role centers on network topology/link status: tracking spanning-tree state and configuration per bridge instance to detect loops, port blocking, or misconfiguration across the multiple bridging domains on the node, rather than exposing environmental hardware sensors. It builds on standard bridge/spanning-tree MIB concepts (akin to BRIDGE-MIB) extended to support multiple bridge instances per device. It is deployed on legacy Newbridge Networks (later part of Alcatel) multiservice switching platforms that implement several bridging domains on one chassis. Engineers can download the MULTIBRIDGE-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in MULTIBRIDGE-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

Newbridge Networks multiservice switching platform

Monitoring Examples

An operator would enumerate each bridge entity on the node and check its spanning-tree port states, revealing if one of several independent bridging domains on the same chassis has a port stuck in a blocking or disabled state due to a topology change. This lets administrators isolate a loop or misconfiguration to a specific bridge instance rather than the entire multi-bridge node.

What Can Be Monitored

per-bridge-entity spanning tree state
port blocking/forwarding status per bridge instance
bridge configuration parameters
topology change indications

Imported Objects

From NNCGNI0001-SMI

nncExtensions

OBJECT-IDENTITY

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using mBrdgBasePortDelayExceededDiscards OID:

Select a Newbridge Networks multiservice switching platform 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 mBrdgBasePortDelayExceededDiscards 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. The number of frames discarded by this port due to excessive transit delay through the bridge. 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 between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
mBrdgBase	1.3.6.1.4.1.123.3.43.1
MAC mBrdgBaseBridgeAddress	1.3.6.1.4.1.123.3.43.1.1.1.1	MacAddress	read-only	The MAC address used by this bridge when it must be referred to in a unique fashion. It is recommended that this be the numerically smallest MAC address of all ports that belong to this bridge. However it is only required to be unique. When concatenated with mBrdgStpPriority a unique BridgeIdentifier is formed which is used in the Spanning Tree Protocol.
mBrdgBaseEntry	1.3.6.1.4.1.123.3.43.1.1.1		not-accessible	A list of information for each bridge of the Node.
INT mBrdgBaseNumPorts	1.3.6.1.4.1.123.3.43.1.1.1.2	INTEGER	read-only	The number of ports controlled by this bridging entity.
INT mBrdgBasePort	1.3.6.1.4.1.123.3.43.1.2.1.1	INTEGER	read-only	The port number of the port for which this entry contains bridge management information.
INT mBrdgBasePortBridgeIndex	1.3.6.1.4.1.123.3.43.1.2.1.6	INTEGER	read-only	The bridge number for which this entry contains bridge management information.
OID mBrdgBasePortCircuit	1.3.6.1.4.1.123.3.43.1.2.1.3	OBJECT IDENTIFIER	read-only	For a port which (potentially) has the same value of mBrdgBasePortIfIndex as another port on the same bridge, this object contains the name of an object instance unique to this port. For example, in the case where mBrdgple ports correspond one- to-one with mBrdgple X.25 virtual circuits, this value might identify an (e.g., the first) object instance associated with the X.25 virtual circuit corresponding to this port. For a port which has a unique value of mBrdgBasePortIfIndex, this object can have the value { 0 0 }.
C32 mBrdgBasePortDelayExceededDiscardsEx	1.3.6.1.4.1.123.3.43.1.2.1.4	Counter32	read-only	The number of frames discarded by this port due to excessive transit delay through the bridge. It is incremented by both transparent and source route bridges.
mBrdgBasePortEntry	1.3.6.1.4.1.123.3.43.1.2.1		not-accessible	A list of information for each port of the bridge.
INT mBrdgBasePortIfIndex	1.3.6.1.4.1.123.3.43.1.2.1.2	INTEGER	read-only	The value of the instance of the ifIndex object, defined in MIB-II, for the interface corresponding to this port.
C32 mBrdgBasePortMtuExceededDiscards	1.3.6.1.4.1.123.3.43.1.2.1.5	Counter32	read-only	The number of frames discarded by this port due to an excessive size. It is incremented by both transparent and source route bridges.
mBrdgBasePortTable	1.3.6.1.4.1.123.3.43.1.2		not-accessible	A table that contains generic information about every port that is associated with this bridge. Transparent, source-route, and srt ports are included. Rows cannot be added to nor deleted from this table.
mBrdgBaseTable	1.3.6.1.4.1.123.3.43.1.1		not-accessible	This table contains scalar values defined under dot1dBase in BRIDGE-MIB. Rows cannot be added to nor deleted from this table.
INT mBrdgBaseType	1.3.6.1.4.1.123.3.43.1.1.1.3	INTEGER	read-only	Indicates what type of bridging this bridge can perform. If a bridge is actually performing a certain type of bridging this will be indicated by entries in the port table for the given type.
mBrdgConfig	1.3.6.1.4.1.123.3.43.5
INT mBrdgConfigBridgeIndex	1.3.6.1.4.1.123.3.43.5.1.1.1	INTEGER	read-only	The bridge number for which this entry contains bridge management information.
OCT mBrdgConfigBridgeName	1.3.6.1.4.1.123.3.43.5.1.1.2	OCTET STRING	read-write	The name given to this bridge entity.
INT mBrdgConfigBridgePeakRate	1.3.6.1.4.1.123.3.43.5.1.1.3	INTEGER	read-write	The maximum rate (in percentage) at which data is accepted from ports on this bridge entity.
mBrdgConfigEntry	1.3.6.1.4.1.123.3.43.5.1.1		not-accessible	A list of information for each bridge of the Node.
mBrdgConfigTable	1.3.6.1.4.1.123.3.43.5.1		not-accessible	This table contains attributes for the different bridges Rows cannot be added to nor deleted from this table.
mBrdgStatic	1.3.6.1.4.1.123.3.43.4
MAC mBrdgStaticAddress	1.3.6.1.4.1.123.3.43.4.1.1.1	MacAddress	read-write	The destination MAC address in a frame to which this entry's filtering information applies. This object can take the value of a unicast address, a group address or the broadcast address.
OCT mBrdgStaticAllowedToGoTo	1.3.6.1.4.1.123.3.43.4.1.1.3	OCTET STRING	read-write	The set of ports to which frames received from a specific port and destined for a specific MAC address, are allowed to be forwarded. Each octet within the value of this object specifies a set of eight ports, with the first octet specifying ports 1 through 8, the second octet specifying ports 9 through 16, etc. Within each octet, the most significant bit represents the lowest numbered port, and the least significant bit represents the highest numbered port. Thus, each port of the bridge is represented by a single bit within the value of this object. If that bit has a value of '1' then that port is included in the set of ports; the port is not included if its bit has a value of '0'. (Note that the setting of the bit corresponding to the port from which a frame is received is irrelevant.) The default value of this object is a string of ones of appropriate length.
INT mBrdgStaticBridgeIndex	1.3.6.1.4.1.123.3.43.4.1.1.7	INTEGER	read-only	The bridge number for which this entry contains bridge management information.
mBrdgStaticEntry	1.3.6.1.4.1.123.3.43.4.1.1		not-accessible	Filtering information configured into the bridge by (local or network) management specifying the set of ports to which frames received from a specific port and containing a specific destination address are allowed to be forwarded.
INT mBrdgStaticReceivePort	1.3.6.1.4.1.123.3.43.4.1.1.2	INTEGER	read-write	Either the value '0', or the port number of the port from which a frame must be received in order for this entry's filtering information to apply. A value of zero indicates that this entry applies on all ports of the bridge for which there is no other applicable entry.
INT mBrdgStaticStatus	1.3.6.1.4.1.123.3.43.4.1.1.4	INTEGER	read-write	This object indicates the status of this entry. The default value is permanent(3). other(1) - this entry is currently in use but the conditions under which it will remain so are different from each of the following values. invalid(2) - writing this value to the object removes the corresponding entry. permanent(3) - this entry is currently in use and will remain so after the next reset of the bridge. deleteOnReset(4) - this entry is currently in use and will remain so until the next reset of the bridge. deleteOnTimeout(5) - this entry is currently in use and will remain so until it is aged out.
mBrdgStaticTable	1.3.6.1.4.1.123.3.43.4.1		not-accessible	A table containing filtering information configured into the bridge by (local or network) management specifying the set of ports to which frames received from specific ports and containing specific destination addresses are allowed to be forwarded. The value of zero in this table as the port number from which frames with a specific destination address are received, is used to specify all ports for which there is no specific entry in this table for that particular destination address. Entries are valid for unicast and for group/broadcast addresses.
mBrdgStp	1.3.6.1.4.1.123.3.43.2
TIM mBrdgStpBridgeForwardDelay	1.3.6.1.4.1.123.3.43.2.1.1.14	Timeout	read-write	The value that all bridges use for ForwardDelay when this bridge is acting as the root. Note that 802.1D-1990 specifies that the range for this parameter is related to the value of mBrdgStpBridgeMaxAge. The granularity of this timer is specified by 802.1D-1990 to be 1 second. An agent may return a badValue error if a set is attempted to a value which is not a whole number of seconds.
TIM mBrdgStpBridgeHelloTime	1.3.6.1.4.1.123.3.43.2.1.1.13	Timeout	read-write	The value that all bridges use for HelloTime when this bridge is acting as the root. The granularity of this timer is specified by 802.1D- 1990 to be 1 second. An agent may return a badValue error if a set is attempted to a value which is not a whole number of seconds.
INT mBrdgStpBridgeIndex	1.3.6.1.4.1.123.3.43.2.1.1.16	INTEGER	read-only	The bridge number for which this entry contains bridge management information.
TIM mBrdgStpBridgeMaxAge	1.3.6.1.4.1.123.3.43.2.1.1.12	Timeout	read-write	The value that all bridges use for MaxAge when this bridge is acting as the root. Note that 802.1D-1990 specifies that the range for this parameter is related to the value of mBrdgStpBridgeHelloTime. The granularity of this timer is specified by 802.1D-1990 to be 1 second. An agent may return a badValue error if a set is attempted to a value which is not a whole number of seconds.
BRI mBrdgStpDesignatedRoot	1.3.6.1.4.1.123.3.43.2.1.1.5	BridgeId	read-only	The bridge identifier of the root of the spanning tree as determined by the Spanning Tree Protocol as executed by this node. This value is used as the Root Identifier parameter in all Configuration Bridge PDUs originated by this node.
INT mBrdgStpEnable	1.3.6.1.4.1.123.3.43.2.1.1.15	INTEGER	read-write	Specifies if this bridge entity has an instance of the Spanning Tree Protocol running.
mBrdgStpEntry	1.3.6.1.4.1.123.3.43.2.1.1		not-accessible	A list of information for each bridge of the Node.
TIM mBrdgStpForwardDelay	1.3.6.1.4.1.123.3.43.2.1.1.11	Timeout	read-only	This time value, measured in units of hundredths of a second, controls how fast a port changes its spanning state when moving towards the Forwarding state. The value determines how long the port stays in each of the Listening and Learning states, which precede the Forwarding state. This value is also used, when a topology change has been detected and is underway, to age all dynamic entries in the Forwarding Database. [Note that this value is the one that this bridge is currently using, in contrast to mBrdgStpBridgeForwardDelay which is the value that this bridge and all others would start using if/when this bridge were to become the root.]
TIM mBrdgStpHelloTime	1.3.6.1.4.1.123.3.43.2.1.1.9	Timeout	read-only	The amount of time between the transmission of Configuration bridge PDUs by this node on any port when it is the root of the spanning tree or trying to become so, in units of hundredths of a second. This is the actual value that this bridge is currently using.
INT mBrdgStpHoldTime	1.3.6.1.4.1.123.3.43.2.1.1.10	INTEGER	read-only	This time value determines the interval length during which no more than two Configuration bridge PDUs shall be transmitted by this node, in units of hundredths of a second.
TIM mBrdgStpMaxAge	1.3.6.1.4.1.123.3.43.2.1.1.8	Timeout	read-only	The maximum age of Spanning Tree Protocol information learned from the network on any port before it is discarded, in units of hundredths of a second. This is the actual value that this bridge is currently using.
INT mBrdgStpPort	1.3.6.1.4.1.123.3.43.2.2.1.1	INTEGER	read-only	The port number of the port for which this entry contains Spanning Tree Protocol management information.
INT mBrdgStpPortBridgeIndex	1.3.6.1.4.1.123.3.43.2.2.1.13	INTEGER	read-only	The bridge number for which this entry contains bridge management information.
BRI mBrdgStpPortDesignatedBridge	1.3.6.1.4.1.123.3.43.2.2.1.8	BridgeId	read-only	The Bridge Identifier of the bridge which this port considers to be the Designated Bridge for this port's segment.
INT mBrdgStpPortDesignatedCost	1.3.6.1.4.1.123.3.43.2.2.1.7	INTEGER	read-only	The path cost of the Designated Port of the segment connected to this port. This value is compared to the Root Path Cost field in received bridge PDUs.
OCT mBrdgStpPortDesignatedPort	1.3.6.1.4.1.123.3.43.2.2.1.9	OCTET STRING	read-only	The Port Identifier of the port on the Designated Bridge for this port's segment.
BRI mBrdgStpPortDesignatedRoot	1.3.6.1.4.1.123.3.43.2.2.1.6	BridgeId	read-only	The unique Bridge Identifier of the Bridge recorded as the Root in the Configuration BPDUs transmitted by the Designated Bridge for the segment to which the port is attached.
INT mBrdgStpPortEnable	1.3.6.1.4.1.123.3.43.2.2.1.4	INTEGER	read-write	The enabled/disabled status of the port.
mBrdgStpPortEntry	1.3.6.1.4.1.123.3.43.2.2.1		not-accessible	A list of information maintained by every port about the Spanning Tree Protocol state for that port.
C32 mBrdgStpPortForwardTransitions	1.3.6.1.4.1.123.3.43.2.2.1.10	Counter32	read-only	The number of times this port has transitioned from the Learning state to the Forwarding state.
INT mBrdgStpPortPathCost	1.3.6.1.4.1.123.3.43.2.2.1.5	INTEGER	read-write	The contribution of this port to the path cost of paths towards the spanning tree root which include this port. 802.1D-1990 recommends that the default value of this parameter be in inverse proportion to the speed of the attached LAN.
INT mBrdgStpPortPriority	1.3.6.1.4.1.123.3.43.2.2.1.2	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 mBrdgStpPort.
INT mBrdgStpPortState	1.3.6.1.4.1.123.3.43.2.2.1.3	INTEGER	read-only	The port's current state as defined by application of the Spanning Tree Protocol. This state controls what action a port takes on reception of a frame. If the bridge has detected a port that is malfunctioning it will place that port into the broken(6) state. For ports which are disabled (see mBrdgStpPortEnable), this object will have a value of disabled(1).
C32 mBrdgStpPortStatsRxBPDUCount	1.3.6.1.4.1.123.3.43.2.2.1.12	Counter32	read-write	The total number of BPDU's received on this port. Sets may only be done with a value of 0.
C32 mBrdgStpPortStatsTxBPDUCount	1.3.6.1.4.1.123.3.43.2.2.1.11	Counter32	read-write	The total number of BPDU's sent on this port. Sets may only be done with a value of 0.
mBrdgStpPortTable	1.3.6.1.4.1.123.3.43.2.2		not-accessible	A table that contains port-specific information for the Spanning Tree Protocol. Rows cannot be added to nor deleted from this table.
INT mBrdgStpPriority	1.3.6.1.4.1.123.3.43.2.1.1.2	INTEGER	read-write	The value of the write-able portion of the Bridge ID, i.e., the first two octets of the (8 octet long) Bridge ID. The other (last) 6 octets of the Bridge ID are given by the value of mBrdgBaseTableBridgeAddress.
INT mBrdgStpProtocolSpecification	1.3.6.1.4.1.123.3.43.2.1.1.1	INTEGER	read-only	An indication of what version of the Spanning Tree Protocol is being run. The value 'decLb100(2)' indicates the DEC LANbridge 100 Spanning Tree protocol. IEEE 802.1d implementations will return 'ieee8021d(3)'. If future versions of the IEEE Spanning Tree Protocol are released that are incompatible with the current version a new value will be defined.
INT mBrdgStpRootCost	1.3.6.1.4.1.123.3.43.2.1.1.6	INTEGER	read-only	The cost of the path to the root as seen from this bridge.
INT mBrdgStpRootPort	1.3.6.1.4.1.123.3.43.2.1.1.7	INTEGER	read-only	The port number of the port which offers the lowest cost path from this bridge to the root bridge.
mBrdgStpTable	1.3.6.1.4.1.123.3.43.2.1		not-accessible	This table contains scalar values defined under dot1dStp in BRIDGE-MIB. Rows cannot be added to nor deleted from this table.
TIK mBrdgStpTimeSinceTopologyChange	1.3.6.1.4.1.123.3.43.2.1.1.3	TimeTicks	read-only	The time (in hundredths of a second) since the last time a topology change was detected by the bridge entity.
C32 mBrdgStpTopChanges	1.3.6.1.4.1.123.3.43.2.1.1.4	Counter32	read-only	The total number of topology changes detected by this bridge since the management entity was last reset or initialized.
mBrdgTp	1.3.6.1.4.1.123.3.43.3
INT mBrdgTpAgingTime	1.3.6.1.4.1.123.3.43.3.1.1.2	INTEGER	read-write	The timeout period in seconds for aging out dynamically learned forwarding information. 802.1D-1990 recommends a default of 300 seconds.
INT mBrdgTpBridgeIndex	1.3.6.1.4.1.123.3.43.3.1.1.6	INTEGER	read-only	The bridge number for which this entry contains bridge management information.
mBrdgTpEntry	1.3.6.1.4.1.123.3.43.3.1.1		not-accessible	A list of information for each bridge of the Node.
MAC mBrdgTpFdbAddress	1.3.6.1.4.1.123.3.43.3.2.1.1	MacAddress	read-only	A unicast MAC address for which the bridge has forwarding and/or filtering information.
INT mBrdgTpFdbBridgeIndex	1.3.6.1.4.1.123.3.43.3.2.1.4	INTEGER	read-only	The bridge number for which this entry contains bridge management information.
mBrdgTpFdbEntry	1.3.6.1.4.1.123.3.43.3.2.1		not-accessible	Information about a specific unicast MAC address for which the bridge has some forwarding and/or filtering information.
INT mBrdgTpFdbNumEntries	1.3.6.1.4.1.123.3.43.3.1.1.5	INTEGER	read-write	Returns the number of stations (static and learned) in the filtering database. Writing 0 clears all the entries (static and learned).
INT mBrdgTpFdbNumLearnedEntries	1.3.6.1.4.1.123.3.43.3.1.1.4	INTEGER	read-write	Returns the number of learned stations in the filtering database. Writing 0 clears all the entries (learned entries only).
INT mBrdgTpFdbPort	1.3.6.1.4.1.123.3.43.3.2.1.2	INTEGER	read-only	Either the value '0', or the port number of the port on which a frame having a source address equal to the value of the corresponding instance of mBrdgTpFdbAddress has been seen. A value of '0' indicates that the port number has not been learned but that the bridge does have some forwarding/filtering information about this address (e.g. in the mBrdgStaticTable). Implementors are encouraged to assign the port value to this object whenever it is learned even for addresses for which the corresponding value of mBrdgTpFdbStatus is not learned(3).
INT mBrdgTpFdbStatus	1.3.6.1.4.1.123.3.43.3.2.1.3	INTEGER	read-only	The status of this entry. The meanings of the values are: other(1) : none of the following. This would include the case where some other MIB object (not the corresponding instance of mBrdgTpFdbPort, nor an entry in the mBrdgStaticTable) is being used to determine if and how frames addressed to the value of the corresponding instance of mBrdgTpFdbAddress are being forwarded. invalid(2) : this entry is not longer valid (e.g., it was learned but has since aged-out), but has not yet been flushed from the table. learned(3) : the value of the corresponding instance of mBrdgTpFdbPort was learned, and is being used. self(4) : the value of the corresponding instance of mBrdgTpFdbAddress represents one of the bridge's addresses. The corresponding instance of mBrdgTpFdbPort indicates which of the bridge's ports has this address. mgmt(5) : the value of the corresponding instance of mBrdgTpFdbAddress is also the value of an existing instance of mBrdgStaticAddress.
mBrdgTpFdbTable	1.3.6.1.4.1.123.3.43.3.2		not-accessible	A table that contains information about unicast entries for which the bridge has forwarding and/or filtering information. This information is used by the transparent bridging function in determining how to propagate a received frame. Rows cannot be added to this table. To delete rows, see mBrdgTpFdbStatus.
C32 mBrdgTpLearnedEntryDiscards	1.3.6.1.4.1.123.3.43.3.1.1.1	Counter32	read-only	The total number of Forwarding Database entries, which have been or would have been learnt, but have been discarded due to a lack of space to store them in the Forwarding Database. If this counter is increasing, it indicates that the Forwarding Database is regularly becoming full (a condition which has unpleasant performance effects on the subnetwork). If this counter has a significant value but is not presently increasing, it indicates that the problem has been occurring but is not persistent.
INT mBrdgTpLearningEnable	1.3.6.1.4.1.123.3.43.3.1.1.3	INTEGER	read-write	Specifies if this bridge entity will learn new MAC addresses.
INT mBrdgTpPort	1.3.6.1.4.1.123.3.43.3.3.1.1	INTEGER	read-only	The port number of the port for which this entry contains Transparent bridging management information.
INT mBrdgTpPortBridgeIndex	1.3.6.1.4.1.123.3.43.3.3.1.6	INTEGER	read-only	The bridge number for which this entry contains bridge management information.
mBrdgTpPortEntry	1.3.6.1.4.1.123.3.43.3.3.1		not-accessible	A list of information for each port of a transparent bridge.
C32 mBrdgTpPortInDiscards	1.3.6.1.4.1.123.3.43.3.3.1.5	Counter32	read-only	Count of valid frames received which were discarded (i.e., filtered) by the Forwarding Process.
C32 mBrdgTpPortInFrames	1.3.6.1.4.1.123.3.43.3.3.1.3	Counter32	read-only	The number of frames that have been received by this port from its segment. Note that a frame received on the interface corresponding to this port is only counted by this object if and only if it is for a protocol being processed by the local bridging function, including bridge management frames.
INT mBrdgTpPortMaxInfo	1.3.6.1.4.1.123.3.43.3.3.1.2	INTEGER	read-only	The maximum size of the INFO (non-MAC) field that this port will receive or transmit.
C32 mBrdgTpPortOutFrames	1.3.6.1.4.1.123.3.43.3.3.1.4	Counter32	read-only	The number of frames that have been transmitted by this port to its segment. Note that a frame transmitted on the interface corresponding to this port is only counted by this object if and only if it is for a protocol being processed by the local bridging function, including bridge management frames.
mBrdgTpPortTable	1.3.6.1.4.1.123.3.43.3.3		not-accessible	A table that contains information about every port that is associated with this transparent bridge. Rows cannot be added to nor deleted from this table.
mBrdgTpTable	1.3.6.1.4.1.123.3.43.3.1		not-accessible	This table contains scalar values defined under dot1dTp in BRIDGE-MIB. Rows cannot be added to nor deleted from this table.
nncExtMultiBridge	1.3.6.1.4.1.123.3.43			Newbridge's multi-BRIDGE MIB Module. for nodes which implements more than one bridge entity.

RFC description

Newbridge multi-bridge management for nodes implementing multiple bridge entities.

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