ZYXEL-MRSTP-MIB

All MIBs › ZYXEL-MRSTP-MIB

Organization: Enterprise Solution ZyXEL

Last Updated: 2012-07-01

Category: ZyXEL Spanning Tree and Link Redundancy

Description: Manages ZyXEL Multiple Rapid Spanning Tree Protocol for running separate STP instances per VLAN group.

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What Is ZYXEL-MRSTP-MIB?

ZYXEL-MRSTP-MIB is a ZyXEL private enterprise MIB for Multiple Rapid Spanning Tree Protocol (MRSTP), a ZyXEL-specific mechanism for running several independent RSTP instances, typically one per VLAN group, on a single switch, placing it in the switching/Layer-2 redundancy category. It exposes per-instance spanning-tree configuration and the resulting port roles/states, such as root, designated, blocking, or forwarding, for each MRSTP instance, functioning as a software-state and topology-health monitoring point rather than a hardware sensor. Its central monitoring use is detecting topology changes and blocked/forwarding port transitions per spanning-tree instance, which reveals redundant-link failover events or unexpected loops/segmentation in the Layer 2 topology. It is an extension layered on top of standard STP/RSTP concepts (IEEE 802.1D/802.1w) adapted to support multiple concurrent instances. It is typically deployed on ZyXEL switches in networks segmented into several VLAN groups where independent, per-group spanning-tree redundancy and load distribution across uplinks is desired. Engineers can download the ZYXEL-MRSTP-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in ZYXEL-MRSTP-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

ZyXEL managed Ethernet switch

Monitoring Examples

An administrator would poll the per-instance port role/state for each MRSTP instance to confirm that root-port and designated-port assignments match the intended redundant topology, and watch for a topology-change count increment. An unexpected transition of a port from forwarding to blocking on a given MRSTP instance indicates a link failure or recovery event in that VLAN group's spanning tree, which should be correlated with physical link status. Since no sample objects were supplied for this MIB, specific table names are unconfirmed, but MRSTP's functional monitoring centers on per-instance port state and topology-change events.

What Can Be Monitored

per-instance spanning tree port role/state
topology change count per MRSTP instance
root bridge/port identification
instance-to-VLAN-group mapping

Imported Objects

From BRIDGE-MIB

BridgeId
Timeout
dot1dBasePort	OBJECT-TYPE

From P-BRIDGE-MIB

EnabledStatus

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks

From ZYXEL-ES-SMI

esMgmt

OBJECT-IDENTITY

How to Use in IPNetwork Monitor

Example using zyMrstpBridgeInfoTopologyChanges OID:

Select a ZyXEL managed Ethernet switch (MRSTP per-instance port-role/state status) 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 zyMrstpBridgeInfoTopologyChanges 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 total number of topology changes detected by this bridge since the management entity was last reset or initialized. 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
zyxelMrstp	1.3.6.1.4.1.890.1.15.3.52			The subtree for Multiple Rapid Spanning Tree Protocol (MRSTP)
zyxelMrstpSetup	1.3.6.1.4.1.890.1.15.3.52.1
zyxelMrstpBridgeTable	1.3.6.1.4.1.890.1.15.3.52.1.1		not-accessible	The table contains MRSTP bridge configuration.
zyxelMrstpBridgeEntry	1.3.6.1.4.1.890.1.15.3.52.1.1.1		not-accessible	An entry contains MRSTP bridge configuration.
INT zyMrstpBridgeIndex	1.3.6.1.4.1.890.1.15.3.52.1.1.1.1	INTEGER	not-accessible	The tree index of the MRSTP.
ENA zyMrstpBridgeState	1.3.6.1.4.1.890.1.15.3.52.1.1.1.2	EnabledStatus	read-write	Enable/Disable on the mrstp bridge.
INT zyMrstpBridgePriority	1.3.6.1.4.1.890.1.15.3.52.1.1.1.3	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 dot1dBaseBridgeAddress.
TIM zyMrstpBridgeRootMaxAge	1.3.6.1.4.1.890.1.15.3.52.1.1.1.4	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 zyxelMrstpBridgeHelloTime. 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 zyMrstpBridgeRootHelloTime	1.3.6.1.4.1.890.1.15.3.52.1.1.1.5	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.
TIM zyMrstpBridgeRootForwardDelay	1.3.6.1.4.1.890.1.15.3.52.1.1.1.6	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 mrstpBridgeMaxAge. 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.
zyxelMrstpPortTable	1.3.6.1.4.1.890.1.15.3.52.1.2		not-accessible	The table contains MRSTP port configuration.
zyxelMrstpPortEntry	1.3.6.1.4.1.890.1.15.3.52.1.2.1		not-accessible	An entry contains MRSTP port configuration.
INT zyMrstpPortPriority	1.3.6.1.4.1.890.1.15.3.52.1.2.1.1	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 mrstpPort.
ENA zyMrstpPortEnable	1.3.6.1.4.1.890.1.15.3.52.1.2.1.2	EnabledStatus	read-write	Enable/Disable the MRSTP on the port.
INT zyMrstpPortPathCost	1.3.6.1.4.1.890.1.15.3.52.1.2.1.3	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 zyMrstpPortOnBridgeIndex	1.3.6.1.4.1.890.1.15.3.52.1.2.1.4	INTEGER	read-write	Indetify the bridge index that this port joined to in MRSTP.
INT zyMrstpPortAdminEdgePort	1.3.6.1.4.1.890.1.15.3.52.1.2.1.5	INTEGER	read-write	The administrative value of the Edge Port parameter. A value of true(1) indicates that this port should be assumed as an edge-port, and a value of false(2) indicates that this port should be assumed as a non-edge-port.
zyxelMrstpStatus	1.3.6.1.4.1.890.1.15.3.52.2
zyxelMrstpBridgeInfoTable	1.3.6.1.4.1.890.1.15.3.52.2.1		not-accessible	The table contains MRSTP bridge information.
zyxelMrstpBridgeInfoEntry	1.3.6.1.4.1.890.1.15.3.52.2.1.1		not-accessible	An entry contains MRSTP bridge information.
INT zyMrstpBridgeInfoIndex	1.3.6.1.4.1.890.1.15.3.52.2.1.1.1	INTEGER	not-accessible	The tree index of the MRSTP.
INT zyMrstpBridgeInfoProtocolSpecification	1.3.6.1.4.1.890.1.15.3.52.2.1.1.2	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.
TIK zyMrstpBridgeInfoTimeSinceTopologyChange	1.3.6.1.4.1.890.1.15.3.52.2.1.1.3	TimeTicks	read-only	The time (in hundredths of a second) since the last time a topology change was detected by the bridge entity.
C32 zyMrstpBridgeInfoTopologyChangesEx	1.3.6.1.4.1.890.1.15.3.52.2.1.1.4	Counter32	read-only	The total number of topology changes detected by this bridge since the management entity was last reset or initialized.
BRI zyMrstpBridgeInfoDesignatedRoot	1.3.6.1.4.1.890.1.15.3.52.2.1.1.5	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 zyMrstpBridgeInfoRootCost	1.3.6.1.4.1.890.1.15.3.52.2.1.1.6	INTEGER	read-only	The cost of the path to the root as seen from this bridge.
INT zyMrstpBridgeInfoRootPort	1.3.6.1.4.1.890.1.15.3.52.2.1.1.7	INTEGER	read-only	The port number of the port which offers the lowest cost path from this bridge to the root bridge.
TIM zyMrstpBridgeInfoMaxAge	1.3.6.1.4.1.890.1.15.3.52.2.1.1.8	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.
TIM zyMrstpBridgeInfoHelloTime	1.3.6.1.4.1.890.1.15.3.52.2.1.1.9	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 zyMrstpBridgeInfoHoldTime	1.3.6.1.4.1.890.1.15.3.52.2.1.1.10	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 zyMrstpBridgeInfoForwardDelay	1.3.6.1.4.1.890.1.15.3.52.2.1.1.11	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 i currently using, in contrast to zyxelMrstpBridgeInfoForwardDelay which is the value that this bridge and all others would start using if/when this bridge were to become the root.
TIM zyMrstpBridgeInfoRootMaxAge	1.3.6.1.4.1.890.1.15.3.52.2.1.1.12	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 zyxelMrstpBridgeInfoHelloTime. 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 zyMrstpBridgeInfoRootHelloTime	1.3.6.1.4.1.890.1.15.3.52.2.1.1.13	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.
TIM zyMrstpBridgeInfoRootForwardDelay	1.3.6.1.4.1.890.1.15.3.52.2.1.1.14	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 MrstpBridgeInfoMaxAge. 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.
zyxelMrstpPortInfoTable	1.3.6.1.4.1.890.1.15.3.52.2.2		not-accessible	The table contains MRSTP port information.
zyxelMrstpPortInfoEntry	1.3.6.1.4.1.890.1.15.3.52.2.2.1		not-accessible	An entry contains MRSTP port information.
INT zyMrstpPortInfoState	1.3.6.1.4.1.890.1.15.3.52.2.2.1.1	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 MrstpPortInfoEnable), this object will have a value of disabled(1).
BRI zyMrstpPortInfoDesignatedRoot	1.3.6.1.4.1.890.1.15.3.52.2.2.1.2	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 zyMrstpPortInfoDesignatedCost	1.3.6.1.4.1.890.1.15.3.52.2.2.1.3	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.
BRI zyMrstpPortInfoDesignatedBridge	1.3.6.1.4.1.890.1.15.3.52.2.2.1.4	BridgeId	read-only	The Bridge Identifier of the bridge which this port considers to be the Designated Bridge for this port's segment.
OCT zyMrstpPortInfoDesignatedPort	1.3.6.1.4.1.890.1.15.3.52.2.2.1.5	OCTET STRING	read-only	The Port Identifier of the port on the Designated Bridge for this port's segment.
C32 zyMrstpPortInfoForwardTransitions	1.3.6.1.4.1.890.1.15.3.52.2.2.1.6	Counter32	read-only	The number of times this port has transitioned from the Learning state to the Forwarding state.
INT zyMrstpPortInfoOperEdgePort	1.3.6.1.4.1.890.1.15.3.52.2.2.1.7	INTEGER	read-only	The operational value of the Edge Port parameter. The object is initialized to the value of the corresponding instance of dot1dStpPortAdminEdgePort. When the corresponding instance of dot1dStpPortAdminEdgePort is set, this object will be changed as well. This object will also be changed to false on reception of a BPDU.
zyxelMrstpNotifications	1.3.6.1.4.1.890.1.15.3.52.3
NTF zyMrstpNewRoot	1.3.6.1.4.1.890.1.15.3.52.3.1			The newRoot trap indicates that the sending agent has become the new root of the Spanning Tree; the trap is sent by a bridge soon after its election as the new root, e.g., upon expiration of the Topology Change Timer, immediately subsequent to its election. Implementation of this trap is optional.
NTF zyMrstpTopologyChange	1.3.6.1.4.1.890.1.15.3.52.3.2			A topologyChange is sent if the topology changed of MRSTP has detected.

RFC description

Manages Multiple Rapid Spanning Tree Protocol (MRSTP) configuration on ZyXEL switches for redundant bridging.

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