ACC-STP

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Category: Vendor: ACC/Ericsson

Description: Manages Spanning Tree Protocol (STP) parameters on ACC/Ericsson routers, including bridge priority, port states, and topology change detection.

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What Is ACC-STP?

ACC-STP is a vendor-specific MIB for ACC (Ericsson) routers implementing Spanning Tree Protocol management, covering bridge priority, per-port STP state, and topology-change detection. It exposes configuration data (bridge and port priorities) alongside status data reflecting the live STP topology, such as port role/state and recent topology changes. No module description or sample objects were supplied in the source, so exact object names are unavailable, but by nature this MIB is used to monitor bridging/software-level network topology health, detecting flapping links, unexpected topology changes, or ports stuck in blocking/listening states rather than hardware faults. It likely builds on or parallels the IETF BRIDGE-MIB (RFC 1493/4188) conventions for STP. Typical deployment is on ACC/Ericsson Layer-2 capable routers or switches in enterprise or carrier LANs using STP for loop prevention. Network engineers evaluating or troubleshooting this functionality can download the ACC-STP file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in ACC-STP. 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

ACC/Ericsson router/switch

Monitoring Examples

No sample objects were provided for this module, so no specific object names can be grounded. In practice, an operator would poll per-port STP state and topology-change-count objects to detect an unexpected reconvergence event or a port unexpectedly entering blocking state, which would indicate a physical loop or link flap. This remains general because concrete OIDs were not available in the source.

What Can Be Monitored

bridge priority
port STP state
topology change count
spanning tree root status

Imported Objects

From ACC-MIB

DisplayString
accBRG	OBJECT-IDENTITY

From ACC-SYSTEM

accTrapLogSeqNum

OBJECT-TYPE

From RFC-1215

TRAP-TYPE

From RFC1155-SMI

Counter
Gauge
IpAddress
OBJECT-TYPE
TimeTicks

OIDs

OID symbolic	OID numeric	Type	Access	Description
accStp	1.3.6.1.4.1.5.1.1.2
OCT accStpBrAddr	1.3.6.1.4.1.5.1.1.2.3	OCTET STRING	read-only	MAC address of this bridge.
OCT accStpDesRoot	1.3.6.1.4.1.5.1.1.2.10	OCTET STRING	read-only	The Bridge Identifier of the device currently assumed by this unit to be the Root.
TIK accStpFilterTime	1.3.6.1.4.1.5.1.1.2.5	TimeTicks	read-only	Minimum time period elapsing between the transmission of Hello frames through a given Bridge Port. No more than two Hello frames shall be transmitted in any brStpFilterTime period.
INT accStpForwardDelay	1.3.6.1.4.1.5.1.1.2.15	INTEGER	read-write	The time (seconds) spent in the Listening state while moving from the Blocking state to the Learning state. The time (seconds) spent in the Learning state while moving from the Listening state to the Forwarding state. The value (seconds) used for the ageing time of dynamic entries in the Forwarding Database table wile the Topology Change flag is set in protocol messages received from the Root.
INT accStpHelloTime	1.3.6.1.4.1.5.1.1.2.14	INTEGER	read-write	Interval between Hello frames that this Bridge will initiate when it is Root or is attempting to be Root.
OCT accStpId	1.3.6.1.4.1.5.1.1.2.2	OCTET STRING	read-only	Unique bridge identifier of this bridge. This object comprises two parts, one of which is the MAC address, and the other of which is the brStpPriority and is the more significant part in priority comparisons.
INT accStpMaxAge	1.3.6.1.4.1.5.1.1.2.13	INTEGER	read-write	The value of the Max Age parameter when the Bridge is the Root or attempting to become the Root. The Max Age parameter is conveyed to ensure that each Bridge in a Bridged Local Area Network has a consistent value against which to test the age of stored protocol information.
OCT accStpMcastAddr	1.3.6.1.4.1.5.1.1.2.6	OCTET STRING	read-write	A unique MAC group address, recognised by all the Bridges within the Bridged Local Area Network.
INT accStpMode	1.3.6.1.4.1.5.1.1.2.4	INTEGER	read-write	State of this Bridge's participation in Spanning Tree. Spanning Tree takes care of network connectivity changes caused by addition/removal/failure of links. It avoids loops when any two networks have redundant connections between them.
INT accStpPriority	1.3.6.1.4.1.5.1.1.2.1	INTEGER	read-write	Among all devices participating in spanning tree, the one with the highest priority (numerically lowest value of this parameter) is elected as the Root of the spanning tree.
INT accStpRootPathCost	1.3.6.1.4.1.5.1.1.2.11	INTEGER	read-only	Current path cost to the Root Bridge.
OCT accStpRootPort	1.3.6.1.4.1.5.1.1.2.12	OCTET STRING	read-only	Port Number of the one Port in the direction of the Root. (Value is meaningless if this unit is the Root).
INT accStpTopChange	1.3.6.1.4.1.5.1.1.2.8	INTEGER	read-only	Indicates if the STP topology of a network is in process of changing.
CTR accStpTopChangeCnts	1.3.6.1.4.1.5.1.1.2.17	Counter	read-only
INT accStpTopChangeDet	1.3.6.1.4.1.5.1.1.2.7	INTEGER	read-only	Indicates if this unit has detected the Topology change indication in the hello BPDU.
TIK accStpTopChangeTimer	1.3.6.1.4.1.5.1.1.2.9	TimeTicks	read-only	This timer serves to determine the time period for which hello frames are transmitted with the Topology Change flag parameter set by the Bridge when it is the Root following the detection of a topology change.
TIK accStpUpTime	1.3.6.1.4.1.5.1.1.2.16	TimeTicks	read-only

RFC description

Spanning Tree Protocol (STP) management MIB for ACC bridges, supporting bridge priority and topology change detection.

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Download ACC-STP

What Is ACC-STP?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description