ZYXEL-MSTP-MIB

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Organization: Enterprise Solution ZyXEL

Last Updated: 2012-07-01

Category: ZyXEL Spanning Tree and Link Redundancy

Description: Manages ZyXEL Multiple Spanning Tree Protocol 802.1s for per-VLAN spanning tree topology control.

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What Is ZYXEL-MSTP-MIB?

ZYXEL-MSTP-MIB is a ZyXEL private enterprise MIB implementing IEEE 802.1s Multiple Spanning Tree Protocol, allowing per-VLAN spanning-tree instances on ZyXEL switches. It exposes configuration and topology-state data: MSTP instance-to-VLAN mapping, per-instance port roles/states, and bridge priority settings. Monitoring this MIB reveals spanning-tree health/status, letting an operator check per-instance port state (forwarding/blocking/discarding) to confirm loop-prevention topology is stable and detect topology changes that indicate a link or switch failure. It is an extension of the standard BRIDGE-MIB/802.1Q-MIB spanning-tree constructs to support the newer MSTP standard. It is deployed on ZyXEL switches in networks using VLAN-aware spanning tree for loop prevention across redundant links, typically in campus or data-center access layers. Engineers can download the ZYXEL-MSTP-MIB file directly to load it into their MIB browser.

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

Monitoring Examples

No object/table names were present in the sampled data. Based on the module description ("the subtree for Multiple Spanning Tree Protocol"), the module would expose per-MSTI port state and role objects that an administrator polls to confirm ports remain in the expected forwarding/blocking state and to detect unexpected topology changes indicating a link failure.

What Can Be Monitored

MSTP instance-to-VLAN mapping
per-port spanning-tree state
bridge priority
topology change events

Imported Objects

From BRIDGE-MIB

BridgeId
Timeout
dot1dBasePort	OBJECT-TYPE

From P-BRIDGE-MIB

EnabledStatus

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks

From SNMPv2-TC

DisplayString
RowStatus
TEXTUAL-CONVENTION
TruthValue

From ZYXEL-ES-SMI

esMgmt

OBJECT-IDENTITY

How to Use in IPNetwork Monitor

Example using zyMstpInfoInstanceTopologyChangesCount OID:

Select a ZyXEL managed switch (MSTP instance-to-VLAN mapping/port-role 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 zyMstpInfoInstanceTopologyChangesCount 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. This is the number of times the spanning tree has been reconfigured. 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
zyxelMstp	1.3.6.1.4.1.890.1.15.3.53			The subtree for Multiple Spanning Tree Protocol (MSTP)
zyxelMstpSetup	1.3.6.1.4.1.890.1.15.3.53.1
zyxelMstpGeneral	1.3.6.1.4.1.890.1.15.3.53.1.1
ENA zyMstpGeneralState	1.3.6.1.4.1.890.1.15.3.53.1.1.1	EnabledStatus	read-write	Enable/Disable MSTP on the switch.
STR zyMstpGeneralConfigIdName	1.3.6.1.4.1.890.1.15.3.53.1.1.2	DisplayString	read-write	The configuration name that identifies the MST region and is used as one of the inputs in the computation of the MST Configuration Identifier.
I32 zyMstpGeneralConfigIdRevisionLevel	1.3.6.1.4.1.890.1.15.3.53.1.1.3	Integer32	read-write	This object identifies the MST revision that identifies the MST region and is used as one of the inputs in the computation of the MST configuration Identifier.
TIM zyMstpGeneralHelloTime	1.3.6.1.4.1.890.1.15.3.53.1.1.4	Timeout	read-write	The time interval in seconds between BPDU configuration message generations by the root switch. The allowed range is 1 to 10 seconds.
TIM zyMstpGeneralMaxAge	1.3.6.1.4.1.890.1.15.3.53.1.1.5	Timeout	read-write	This is the maximum time (in seconds) the switch can wait without receiving a BPDU before attempting to reconfigure
TIM zyMstpGeneralForwardDelay	1.3.6.1.4.1.890.1.15.3.53.1.1.6	Timeout	read-write	This is the maximum time (in seconds) the switch will wait before changing states. This delay is required because every switch must receive information about topology changes before it starts to forward frames.
I32 zyMstpGeneralMaxHops	1.3.6.1.4.1.890.1.15.3.53.1.1.7	Integer32	read-write	The number of hops (between 1 and 255) in an MSTP region before the BPDU is discarded and the port information is aged.
INT zyMstpVlanMapMaxNumberOfInstances	1.3.6.1.4.1.890.1.15.3.53.1.2	INTEGER	read-only	The maximum number of MSTP VLAN instances that can be created.
zyxelMstpVlanMapTable	1.3.6.1.4.1.890.1.15.3.53.1.3		not-accessible	The table contains MSTP VLAN map configuration.
zyxelMstpVlanMapEntry	1.3.6.1.4.1.890.1.15.3.53.1.3.1		not-accessible	An entry contains MSTP VLAN map configuration.
MST zyMstpVlanMapInstance	1.3.6.1.4.1.890.1.15.3.53.1.3.1.1	MstiOrCistInstanceIndex	not-accessible	Uniquely identifies an instance. The entry of this table with index 0 presents always, represents CIST. When SET operation
OCT zyMstpVlanMapVlans1k	1.3.6.1.4.1.890.1.15.3.53.1.3.1.2	OCTET STRING	read-write	A string of octets containing one bit per VLAN. The first octet corresponds to VLANs with VlanIndex values 1 through 8; the second octet to VLANs 9 through 16 etc. The most significant bit of each octet corresponds to the lowest VlanIndex value in that octet. For each VLAN that is mapped to this MSTP instance, the bit corresponding to that VLAN is set to '1'. Empty (zero) most significant octes are not mandatory.
OCT zyMstpVlanMapVlans2k	1.3.6.1.4.1.890.1.15.3.53.1.3.1.3	OCTET STRING	read-write	A string of octets containing one bit per VLAN for VLANS with VlanIndex values 1024 through 2047. The first octet corresponds to VLANs with VlanIndex values 1024 through 1031; the second octet to VLANs 1032 through 1039 etc. The most significant bit of each octet corresponds to the lowest VlanIndex value in that octet. For each VLAN that is mapped to this MSTP instance, the bit corresponding to that VLAN is set to '1'. Empty (zero) most significant octes are not mandatory.
OCT zyMstpVlanMapVlans3k	1.3.6.1.4.1.890.1.15.3.53.1.3.1.4	OCTET STRING	read-write	A string of octets containing one bit per VLAN for VLANS with VlanIndex values 2048 through 3071. The first octet corresponds to VLANs with VlanIndex values of 2048 through 2055; the second octet to VLANs 2056 through 2063 etc. The most significant bit of each octet corresponds to the lowest VlanIndex value in that octet. For each VLAN that is mapped to this MSTP instance, the bit corresponding to that VLAN is set to '1'. Empty (zero) most significant octes are not mandatory.
OCT zyMstpVlanMapVlans4k	1.3.6.1.4.1.890.1.15.3.53.1.3.1.5	OCTET STRING	read-write	A string of octets containing one bit per VLAN for VLANS with VlanIndex values 3072 through 4095. The first octet corresponds to VLANs with VlanIndex values 3072 through 3079; the second octet to VLANs 3080 through 3087 etc. The most significant bit of each octet corresponds to the lowest VlanIndex value in that octet. For each VLAN that is mapped to this MSTP instance, the bit corresponding to that VLAN is set to '1'. Empty (zero) most significant octes are not mandatory.
ROW zyMstpVlanMapRowStatus	1.3.6.1.4.1.890.1.15.3.53.1.3.1.6	RowStatus	read-create	This object allow entries to be created and deleted from the MSTP VLAN map table.
zyxelMstpPortTable	1.3.6.1.4.1.890.1.15.3.53.1.4		not-accessible	The table contains MSTP port configuration.
zyxelMstpPortEntry	1.3.6.1.4.1.890.1.15.3.53.1.4.1		not-accessible	An entry contains MSTP port configuration.
INT zyMstpPortAdminEdgePort	1.3.6.1.4.1.890.1.15.3.53.1.4.1.1	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.
zyxelMstpInstanceTable	1.3.6.1.4.1.890.1.15.3.53.1.5		not-accessible	The table contains MSTP instance configuration.
zyxelMstpInstanceEntry	1.3.6.1.4.1.890.1.15.3.53.1.5.1		not-accessible	An entry contains MSTP instance configuration.
MST zyMstpInstanceId	1.3.6.1.4.1.890.1.15.3.53.1.5.1.1	MstiOrCistInstanceIndex	not-accessible	The number you want to use to identify this MST instance on the switch. 0 means CIST.
I32 zyMstpInstanceBridgePriority	1.3.6.1.4.1.890.1.15.3.53.1.5.1.2	Integer32	read-write	priority of the switch for the specific spanning tree instance. The lower the number , the more likely the switch will be chosen as the root bridge within the spanning tree instance. In steps of 4096.
zyxelMstpInstancePortTable	1.3.6.1.4.1.890.1.15.3.53.1.6		not-accessible	The table contains MSTP instance port configuration.
zyxelMstpInstancePortEntry	1.3.6.1.4.1.890.1.15.3.53.1.6.1		not-accessible	An entry contains MSTP instance port configuration.
MST zyMstpInstancePortInstanceId	1.3.6.1.4.1.890.1.15.3.53.1.6.1.1	MstiOrCistInstanceIndex	not-accessible	The number you want to use to identify this MST instance on the switch. 0 means CIST.
ENA zyMstpInstancePortState	1.3.6.1.4.1.890.1.15.3.53.1.6.1.2	EnabledStatus	read-write	Enable/Disable this port to the MST instance.
I32 zyMstpInstancePortPriority	1.3.6.1.4.1.890.1.15.3.53.1.6.1.3	Integer32	read-write	Port priority. Priority decides which port should be disable when more than one port forms a loop in a switch. Ports with a higher priority numeric value are disabled first. In steps of 16.
INT zyMstpInstancePortPathCost	1.3.6.1.4.1.890.1.15.3.53.1.6.1.4	INTEGER	read-write	The cost of transmitting a frame on to a LAN through that port.
zyxelMstpStatus	1.3.6.1.4.1.890.1.15.3.53.2
zyxelMstpInfoGeneral	1.3.6.1.4.1.890.1.15.3.53.2.1
STR zyMstpInfoGeneralConfigIdName	1.3.6.1.4.1.890.1.15.3.53.2.1.1	DisplayString	read-only	The configuration name that identifies the MST region and is used as one of the inputs in the computation of the MST Configuration Identifier.
I32 zyMstpInfoGeneralConfigIdRevisionLevel	1.3.6.1.4.1.890.1.15.3.53.2.1.2	Integer32	read-only	This object identifies the MST revision that identifies the MST region and is used as one of the inputs in the computation of the MST configuration Identifier.
OCT zyMstpInfoGeneralConfigIdConfigDigest	1.3.6.1.4.1.890.1.15.3.53.2.1.3	OCTET STRING	read-only	A configuration digest is generated from the VLAN-MSTI mapping information. This field displays the 16-octet signature that is included in an MSTP BPDU. This field displays the digest when MSTP is activated on the system.
TIM zyMstpInfoGeneralHelloTime	1.3.6.1.4.1.890.1.15.3.53.2.1.4	Timeout	read-only	The time interval in seconds between BPDU configuration message generations by the root switch.
TIM zyMstpInfoGeneralMaxAge	1.3.6.1.4.1.890.1.15.3.53.2.1.5	Timeout	read-only	This is the maximum time (in seconds) the switch can wait without receiving a BPDU before attempting to reconfigure
TIM zyMstpInfoGeneralForwardDelay	1.3.6.1.4.1.890.1.15.3.53.2.1.6	Timeout	read-write	This is the maximum time (in seconds) the switch will wait before changing states. This delay is required because every switch must receive information about topology changes before it starts to forward frames.
I32 zyMstpInfoGeneralCistRootPathCost	1.3.6.1.4.1.890.1.15.3.53.2.1.7	Integer32	read-only	This is the path cost from the root port on this switch to the root switch.
OCT zyMstpInfoGeneralCistRootBridgeId	1.3.6.1.4.1.890.1.15.3.53.2.1.8	OCTET STRING	read-only	This is the path cost from the root port on this switch to the root switch.
zyxelMstpInfoVlanMapTable	1.3.6.1.4.1.890.1.15.3.53.2.2		not-accessible	The table contains MSTP VLAN map information.
zyxelMstpInfoVlanMapEntry	1.3.6.1.4.1.890.1.15.3.53.2.2.1		not-accessible	An entry contains MSTP VLAN map information.
INT zyMstpInfoVlanMapVid	1.3.6.1.4.1.890.1.15.3.53.2.2.1.1	INTEGER	not-accessible	The VLAN ID for which this entry contains the instance mapped.
MST zyMstpInfoVlanMapInstance	1.3.6.1.4.1.890.1.15.3.53.2.2.1.2	MstiOrCistInstanceIndex	read-only	An integer with values ranging from 0 to 64 that identify a the CIST/MSTI instance to which this VLAN is mapped
zyxelMstpInfoPortTable	1.3.6.1.4.1.890.1.15.3.53.2.3		not-accessible	The table contains MSTP VLAN map information.
zyxelMstpInfoPortEntry	1.3.6.1.4.1.890.1.15.3.53.2.3.1		not-accessible	An entry contains MSTP VLAN map information.
T/F zyMstpInfoPortOperEdgePort	1.3.6.1.4.1.890.1.15.3.53.2.3.1.1	TruthValue	read-only	The operational value of the Edge Port parameter. The object is initialized to the value of the corresponding instance of zyxelMstpPortAdminEdgePort. When the corresponding instance of zyxelMstpPortAdminEdgePort is set, this object will be changed as well. This object will also be changed to false on reception of a BPDU.
T/F zyMstpInfoPortOperPointToPointMAC	1.3.6.1.4.1.890.1.15.3.53.2.3.1.2	TruthValue	read-only	The port is operationally connected to a point-to-point link.
zyxelMstpInfoInstanceTable	1.3.6.1.4.1.890.1.15.3.53.2.4		not-accessible	The table contains MSTP instance information.
zyxelMstpInfoInstanceEntry	1.3.6.1.4.1.890.1.15.3.53.2.4.1		not-accessible	An entry contains MSTP instance information.
MST zyMstpInfoInstanceId	1.3.6.1.4.1.890.1.15.3.53.2.4.1.1	MstiOrCistInstanceIndex	not-accessible	the number you want to use to identify this MST instance on the switch. 0 means CIST.
BRI zyMstpInfoInstanceBridgeId	1.3.6.1.4.1.890.1.15.3.53.2.4.1.2	BridgeId	read-only	this is the unique identifier for this bridge, consisting of bridge priority plus MAC address. This ID is the same for root and our bridge if the switch is the root switch.
I32 zyMstpInfoInstanceInternalRootCost	1.3.6.1.4.1.890.1.15.3.53.2.4.1.3	Integer32	read-only	This is the path cost from the root port in this MST instance to the regional root switch.
INT zyMstpInfoInstanceRootPort	1.3.6.1.4.1.890.1.15.3.53.2.4.1.4	INTEGER	read-only	This is the priority and number of the port on the switch through which this switch must communicate with the root of the MST instance.
TIK zyMstpInfoInstanceTimeSinceTopologyChange	1.3.6.1.4.1.890.1.15.3.53.2.4.1.5	TimeTicks	read-only	This is the time since the spanning tree was last reconfigured.
C32 zyMstpInfoInstanceTopologyChangesCountEx	1.3.6.1.4.1.890.1.15.3.53.2.4.1.6	Counter32	read-only	This is the number of times the spanning tree has been reconfigured.
zyxelMstpInfoInstancePortTable	1.3.6.1.4.1.890.1.15.3.53.2.5		not-accessible	The table contains MSTP instance port information.
zyxelMstpInfoInstancePortEntry	1.3.6.1.4.1.890.1.15.3.53.2.5.1		not-accessible	An entry contains MSTP instance port information.
MST zyMstpInfoInstancePortInstanceId	1.3.6.1.4.1.890.1.15.3.53.2.5.1.1	MstiOrCistInstanceIndex	not-accessible	The number you want to use to identify this MST instance on the switch. 0 means CIST.
INT zyMstpInfoInstancePortPathCost	1.3.6.1.4.1.890.1.15.3.53.2.5.1.2	INTEGER	read-only	The cost of transmitting a frame on to a LAN through that port.
INT zyMstpInfoInstancePortState	1.3.6.1.4.1.890.1.15.3.53.2.5.1.3	INTEGER	read-only	STP assigns five port states to eliminate packet looping. A bridge port is not allowed to go directly from blocking state to forwarding state so as to eliminate transient loops.
BRI zyMstpInfoInstancePortDesignatedRoot	1.3.6.1.4.1.890.1.15.3.53.2.5.1.4	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.
I32 zyMstpInfoInstancePortDesignatedCost	1.3.6.1.4.1.890.1.15.3.53.2.5.1.5	Integer32	read-only	The path cost of the Designated Port is connected to this port. This value is compared to the Root Path Cost field in received bridge PDUs.
BRI zyMstpInfoInstancePortDesignatedBridge	1.3.6.1.4.1.890.1.15.3.53.2.5.1.6	BridgeId	read-only	The Bridge Identifier of the bridge that this port considers to be the Designated Bridge for this port's segment.
INT zyMstpInfoInstancePortDesignatedPort	1.3.6.1.4.1.890.1.15.3.53.2.5.1.7	INTEGER	read-only	The Port Identifier of the port on the Designated Bridge for this port's segment.
zyxelMstpNotifications	1.3.6.1.4.1.890.1.15.3.53.3
NTF zyMstpNewRoot	1.3.6.1.4.1.890.1.15.3.53.3.1			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 zyMstpTopologyChange	1.3.6.1.4.1.890.1.15.3.53.3.2			A topologyChange is sent if the topology changed of MSTP has detected.

RFC description

ZyXEL Multiple Spanning Tree Protocol configuration and status monitoring.

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Download ZYXEL-MSTP-MIB