CTRON-BRIDGE-MIB

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Category: VLAN and Bridging, Vendor: Cabletron/Enterasys

Description: Manages Cabletron bridge configuration including spanning tree parameters, port states, and MAC address tables.

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What Is CTRON-BRIDGE-MIB?

CTRON-BRIDGE-MIB is a Cabletron Systems enterprise MIB that manages bridge configuration on Cabletron network switches, covering spanning tree parameters, port administrative/operational states, and dynamically learned MAC address tables. It exposes a mix of configuration data (spanning tree timers and priorities, per-port bridge state) and status data (current port forwarding/blocking state, MAC-to-port bindings) used to understand the Layer 2 topology of a switched network. For hardware/software status monitoring it is primarily useful for confirming that ports are in the expected spanning-tree state (forwarding vs. blocking vs. disabled) and that MAC learning is functioning, which reveals loops, flapping links, or misconfigured redundancy rather than CPU, temperature, or power metrics. It closely parallels and extends the IETF BRIDGE-MIB (RFC 1493) and dot1dStp objects with Cabletron-specific enhancements. It is typically deployed on legacy Cabletron/Enterasys enterprise LAN switches supporting spanning tree in campus network closets. Engineers can download the CTRON-BRIDGE-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CTRON-BRIDGE-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

Cabletron network switch
Cabletron LAN bridge (legacy)

Monitoring Examples

Without sample_objects supplied for this MIB, specific table names cannot be confirmed, but a bridge configuration MIB of this type would be expected to expose a per-port spanning tree state table and a MAC address forwarding table similar to dot1dStpPortTable and dot1dTpFdbTable. An administrator would poll such a port-state table to detect a port stuck in blocking state or unexpectedly re-entering listening/learning state, which signals a spanning tree topology change or a flapping uplink. This description is intentionally general since no object names were provided for grounding.

Imported Objects

From BRIDGE-MIB

BridgeId

From CTRON-MIB-NAMES

ctBridge

OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter
TimeTicks

From RFC1213-MIB

DisplayString

OIDs

OID symbolic	OID numeric	Type	Access	Description
INT ctBridgeBaseChassisMgr	1.3.6.1.4.1.52.4.1.2.3.8.1	INTEGER	read-only	This object reports the chassis management capability of the bridging device. Chassis management is defined as the ability of the device to report status on MIM boards which the device might be responsible for managing, modifying the state of the MIM boards and the ports residing on the MIM board, and tracking and reporting on the status of the networks being bridged and the stations generating traffic on those networks. Note that this is not a comprehensive list of the activities which comprise chassis management. If chassis management is unsupported by this device, then the value notSupported is returned. If chassis management is supported by this device and the device is, in fact, operating as a chassis manager, then the value managementEnabled is re- turned. If chassis management is supported by this device but the device is not functioning as a chassis manager, the value managementDisabled is returned.
ctBridgeExtendedControl	1.3.6.1.4.1.52.4.1.2.3.8
ctBridgeLoadShare	1.3.6.1.4.1.52.4.1.2.3.10
INT ctBridgeLoadShareAdminStatus	1.3.6.1.4.1.52.4.1.2.3.10.1.1.2	INTEGER	read-write	The administrative state of load sharing for this instance.
ctBridgeLoadShareInstanceEntry	1.3.6.1.4.1.52.4.1.2.3.10.1.1		not-accessible	A list of objects for a particular load share instance.
INT ctBridgeLoadShareInstanceId	1.3.6.1.4.1.52.4.1.2.3.10.1.1.1	INTEGER	read-only	Returns the instance for a load share member in the table of load share instances.
ctBridgeLoadShareInstanceTable	1.3.6.1.4.1.52.4.1.2.3.10.1		not-accessible	A list of load share instance objects.
INT ctBridgeLoadShareOperStatus	1.3.6.1.4.1.52.4.1.2.3.10.1.1.3	INTEGER	read-only	The operational status of load sharing for this instance.
INT ctBridgeLoadSharePortAdminStatus	1.3.6.1.4.1.52.4.1.2.3.10.2.1.3	INTEGER	read-write	The administrative state of the port associated with this instance of load share.
ctBridgeLoadSharePortEntry	1.3.6.1.4.1.52.4.1.2.3.10.2.1		not-accessible	A load share port entry containing objects pertaining to a particular load share port.
INT ctBridgeLoadSharePortForwardInstance	1.3.6.1.4.1.52.4.1.2.3.10.2.1.6	INTEGER	read-only	The instance that the ctLoadSharePortFowardMask is running on for this ctLoadSharePortNumber.
INT ctBridgeLoadSharePortForwardMask	1.3.6.1.4.1.52.4.1.2.3.10.2.1.5	INTEGER	read-only	The Mask used to foward unknown packets on.
INT ctBridgeLoadSharePortInstanceId	1.3.6.1.4.1.52.4.1.2.3.10.2.1.2	INTEGER	read-only	A unique value indentifying a member instance in the table of load share instances. This value is similar to ctBridgeLoadShareInstanceId.
INT ctBridgeLoadSharePortNum	1.3.6.1.4.1.52.4.1.2.3.10.2.1.1	INTEGER	read-only	Returns the port number of a member port belonging to a load share instance.
INT ctBridgeLoadSharePortNumPorts	1.3.6.1.4.1.52.4.1.2.3.10.2.1.7	INTEGER	read-only	Displays the number of SmartTrunk ports in this redundant path.
INT ctBridgeLoadSharePortOperStatus	1.3.6.1.4.1.52.4.1.2.3.10.2.1.4	INTEGER	read-only	The operational state of the port associated with this instance of load share.
ctBridgeLoadSharePortTable	1.3.6.1.4.1.52.4.1.2.3.10.2		not-accessible	A list of load share port objects.
ctBridgePvst	1.3.6.1.4.1.52.4.1.2.3.2.2
ctBridgeSdbEnet	1.3.6.1.4.1.52.4.1.2.3.5
INT ctBridgeSdbEnetDataOffset	1.3.6.1.4.1.52.4.1.2.3.5.3.1.4	INTEGER	read-write	The offset into a packet from which the bridge begins its filtering decisions on the 64 byte data window. The value '0' indicates that the window begins at the first byte after the Ethernet MAC header. The largest value of DataOffset is max_Enet_pkt - MAC header - window - 1 (1514 - 14 - 64 - 1 = 1435).
ctBridgeSdbEnetEntry	1.3.6.1.4.1.52.4.1.2.3.5.3.1		not-accessible	Filtering information which extends the filtering capability of IEEE 802.1d.
STR ctBridgeSdbEnetFtrData	1.3.6.1.4.1.52.4.1.2.3.5.3.1.3	DisplayString	read-write	The specific packet string representing the destination address, source address, type/length field and a window of 64 bytes of packet data beginning at DataOffset to be used for filtering decisions. Each ASCII character of the string represents a nibble of packet data, therefore the packet string should be (14+64) * 2 = 156 characters long. A value of 'x' in the packet string is used to indicate a 'Don't care' and no filtering is to be performed on that nibble. The string may be be of size 0 to 78 bytes. If a size less than 78 bytes is used, the string will still begin at the destination address.
INT ctBridgeSdbEnetFtrNo	1.3.6.1.4.1.52.4.1.2.3.5.3.1.1	INTEGER	read-only	The Filter number for which this entry contains filtering information.
OCT ctBridgeSdbEnetIOAllowedToGoTo	1.3.6.1.4.1.52.4.1.2.3.5.4.1.3	OCTET STRING	read-write	The set of ports to which frames received from a specific port and containing the specific packet string of the corresponding filter number 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.)
INT ctBridgeSdbEnetIODelEntry	1.3.6.1.4.1.52.4.1.2.3.5.4.1.4	INTEGER	read-write	Writing a '1' to this object deletes this entry from the Ethernet special database. This object will always return a '1' when read.
ctBridgeSdbEnetIOEntry	1.3.6.1.4.1.52.4.1.2.3.5.4.1		not-accessible	The set of ports to which frames received by the RcvPort and containing the specific packet string of the corresponding filter number of SdbEnetTable are allowed to be forwarded.
INT ctBridgeSdbEnetIOFtrNo	1.3.6.1.4.1.52.4.1.2.3.5.4.1.1	INTEGER	read-only	The Filter number for which this entry contains filtering information.
INT ctBridgeSdbEnetIORcvPort	1.3.6.1.4.1.52.4.1.2.3.5.4.1.2	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 '0' indicates that this entry applies on all ports of the bridge for which there is no other applicable entry.
ctBridgeSdbEnetIOTable	1.3.6.1.4.1.52.4.1.2.3.5.4		not-accessible	A table containing the set of ports to which frames received from specific ports and containing the specific packet string (destination address, source address, type/length field as well as a window of 64 bytes of packet data beginning at a data offset) of the corresponding filter number of SdbEnetTable are allowed to be forwarded. The value of '0' in this table as the RcvPort is used to specify all ports which are not already specified in this table for a particular entry.
INT ctBridgeSdbEnetNoMatch	1.3.6.1.4.1.52.4.1.2.3.5.2	INTEGER	read-write	The process to be performed if no match is found in the Ethernet special database. The process of filtering or forwarding is for all ports. searchFDB results in searching the IEEE 802.1D transparent filter database referenced by the IETF Bridge MIB.
INT ctBridgeSdbEnetState	1.3.6.1.4.1.52.4.1.2.3.5.3.1.2	INTEGER	read-write	The state of the filter for which this entry contains filtering information.
ctBridgeSdbEnetTable	1.3.6.1.4.1.52.4.1.2.3.5.3		not-accessible	A table containing filtering information configured into the bridge by (local or network) management specifying the specific packet string (destination address, source address, type/length field as well as a window of 64 bytes of packet data beginning at a data offset) to be used for filtering decisions. The filters are to be searched in the order of incrementing filter number.
INT ctBridgeSdbEnetTotFtrs	1.3.6.1.4.1.52.4.1.2.3.5.1	INTEGER	read-only	The total number of Ethernet filters in the special database.
ctBridgeSdbGeneric	1.3.6.1.4.1.52.4.1.2.3.9
INT ctBridgeSdbGenericDataOffset	1.3.6.1.4.1.52.4.1.2.3.9.3.1.4	INTEGER	read-write	The offset into a packet from which the bridge begins its filtering decisions on the 64 byte data window. The value '0' indicates that the window begins at the first byte after the Generic MAC header. The largest value of DataOffset dependent upon the media type.
ctBridgeSdbGenericEntry	1.3.6.1.4.1.52.4.1.2.3.9.3.1		not-accessible	Filtering information which extends the filtering capability of IEEE 802.1d.
INT ctBridgeSdbGenericFilterType	1.3.6.1.4.1.52.4.1.2.3.9.3.1.5	INTEGER	read-write	This object specifies the type of media for which this special filter entry applies. The value of this object is a bit encoding which allows for multiple medias to share the same filter. The bit numbers are defined as follows, note that bit 0 is considered to be least significant: ethernet - bit 0 Token Ring - bit 1 FDDI - bit 2 There for a filter that was enabled for both FDDI and ethernet would have a value of 5.
STR ctBridgeSdbGenericFtrData	1.3.6.1.4.1.52.4.1.2.3.9.3.1.3	DisplayString	read-write	The specific packet string representing the destination address, source address, type/length field and a window of 64 bytes of packet data beginning at DataOffset to be used for filtering decisions. Each ASCII character of the string represents a nibble of packet data, therefore the packet string should be (14+64) * 2 = 156 characters long. A value of 'x' in the packet string is used to indicate a 'Don't care' and no filtering is to be performed on that nibble. The string may be be of size 0 to 78 bytes. If a size less than 78 bytes is used, the string will still begin at the destination address.
INT ctBridgeSdbGenericFtrNo	1.3.6.1.4.1.52.4.1.2.3.9.3.1.1	INTEGER	read-only	The Filter number for which this entry contains filtering information.
OCT ctBridgeSdbGenericIOAllowedToGoTo	1.3.6.1.4.1.52.4.1.2.3.9.4.1.3	OCTET STRING	read-write	The set of ports to which frames received from a specific port and containing the specific packet string of the corresponding filter number 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.)
INT ctBridgeSdbGenericIODelEntry	1.3.6.1.4.1.52.4.1.2.3.9.4.1.4	INTEGER	read-write	Writing a '1' to this object deletes this entry from the Generic special database. This object will always return a '1' when read.
ctBridgeSdbGenericIOEntry	1.3.6.1.4.1.52.4.1.2.3.9.4.1		not-accessible	The set of ports to which frames received by the RcvPort and containing the specific packet string of the corresponding filter number of SdbGenericTable are allowed to be forwarded.
INT ctBridgeSdbGenericIOFtrNo	1.3.6.1.4.1.52.4.1.2.3.9.4.1.1	INTEGER	read-only	The Filter number for which this entry contains filtering information.
INT ctBridgeSdbGenericIORcvPort	1.3.6.1.4.1.52.4.1.2.3.9.4.1.2	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 '0' indicates that this entry applies on all ports of the bridge for which there is no other applicable entry.
ctBridgeSdbGenericIOTable	1.3.6.1.4.1.52.4.1.2.3.9.4		not-accessible	A table containing the set of ports to which frames received from specific ports and containing the specific packet string (destination address, source address, type/length field as well as a window of 64 bytes of packet data beginning at a data offset) of the corresponding filter number of SdbGenericTable are allowed to be forwarded. The value of '0' in this table as the RcvPort is used to specify all ports which are not already specified in this table for a particular entry.
INT ctBridgeSdbGenericNoMatch	1.3.6.1.4.1.52.4.1.2.3.9.2	INTEGER	read-write	The process to be performed if no match is found in the Generic special database. The process of filtering or forwarding is for all ports. searchFDB results in searching the IEEE 802.1D transparent filter database referenced by the IETF Bridge MIB.
INT ctBridgeSdbGenericState	1.3.6.1.4.1.52.4.1.2.3.9.3.1.2	INTEGER	read-write	The state of the filter for which this entry contains filtering information.
ctBridgeSdbGenericTable	1.3.6.1.4.1.52.4.1.2.3.9.3		not-accessible	A table containing filtering information configured into the bridge by (local or network) management specifying the specific packet string (destination address, source address, type/length field as well as a window of 64 bytes of packet data beginning at a data offset) to be used for filtering decisions. The filters are to be searched in the order of incrementing filter number.
INT ctBridgeSdbGenericTotFtrs	1.3.6.1.4.1.52.4.1.2.3.9.1	INTEGER	read-only	The total number of Generic filters in the special database.
ctBridgeSdbTr	1.3.6.1.4.1.52.4.1.2.3.6
INT ctBridgeSdbTrDataOffset	1.3.6.1.4.1.52.4.1.2.3.6.3.1.4	INTEGER	read-write	The offset into a packet from which the bridge begins its filtering decisions on the 64 byte data window. The value '0' indicates that the window begins at the first byte after the Token Ring MAC header. The largest value of DataOffset is max_TR_pkt - MAC header - window - 1 (17800 - 14 - 64 - 1 = 17721).
ctBridgeSdbTrEntry	1.3.6.1.4.1.52.4.1.2.3.6.3.1		not-accessible	Filtering information which extends the filtering capability of IEEE 802.1d.
STR ctBridgeSdbTrFtrData	1.3.6.1.4.1.52.4.1.2.3.6.3.1.3	DisplayString	read-write	The specific packet string consisting of the AC, FC, destination address, source address, and a window of 64 bytes of packet data beginning at DataOffset to be used for filtering decisions. Each ASCII character of the string represents a nibble of packet data, therefore the packet string should be (14+64) * 2 = 156 characters long. A value of 'x' in the packet string is used to indicate a 'Don't care' and no filtering is to be performed on that nibble. If a size less than 78 bytes is used, the string will still begin at the AC field.
INT ctBridgeSdbTrFtrNo	1.3.6.1.4.1.52.4.1.2.3.6.3.1.1	INTEGER	read-only	The Filter number for which this entry contains filtering information.
OCT ctBridgeSdbTrIOAllowedToGoTo	1.3.6.1.4.1.52.4.1.2.3.6.4.1.3	OCTET STRING	read-write	The set of ports to which frames received from a specific port and containing the specific packet string of the corresponding filter number 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.)
INT ctBridgeSdbTrIODelEntry	1.3.6.1.4.1.52.4.1.2.3.6.4.1.4	INTEGER	read-write	Writing a '1' to this object deletes this entry from the Token Ring special database. This object will always return a '1' when read.
ctBridgeSdbTrIOEntry	1.3.6.1.4.1.52.4.1.2.3.6.4.1		not-accessible	The set of ports to which frames received by the RcvPort and containing the specific packet string of the corresponding filter number of SdbTrTable are allowed to be forwarded.
INT ctBridgeSdbTrIOFtrNo	1.3.6.1.4.1.52.4.1.2.3.6.4.1.1	INTEGER	read-only	The Filter number for which this entry contains filtering information.
INT ctBridgeSdbTrIORcvPort	1.3.6.1.4.1.52.4.1.2.3.6.4.1.2	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 '0' indicates that this entry applies on all ports of the bridge for which there is no other applicable entry.
ctBridgeSdbTrIOTable	1.3.6.1.4.1.52.4.1.2.3.6.4		not-accessible	A table containing the set of ports to which frames received from specific ports and containing the specific packet string (AC, FC, destination address, source address, as well as a window of 64 bytes of packet data beginning at a data offset) of the corresponding filter number of SdbTrTable are allowed to be forwarded. The value of '0' in this table as the RcvPort is used to specify all ports which are not already specified in this table for a particular entry.
INT ctBridgeSdbTrNoMatch	1.3.6.1.4.1.52.4.1.2.3.6.2	INTEGER	read-write	The process to be performed if no match is found in the Token Ring special database. The process of filtering or forwarding is for all ports. searchFDB results in searching the IEEE 802.1D transparent filter database referenced by the IETF Bridge MIB.
INT ctBridgeSdbTrState	1.3.6.1.4.1.52.4.1.2.3.6.3.1.2	INTEGER	read-write	The state of the filter for which this entry contains filtering information.
ctBridgeSdbTrTable	1.3.6.1.4.1.52.4.1.2.3.6.3		not-accessible	A table containing filtering information configured into the bridge by (local or network) management specifying the specific packet string (AC, FC, destination address, source address, as well as a window of 64 bytes of packet data beginning at a data offset) to be used for filtering decisions. The filters are to be searched in the order of incrementing filter number.
INT ctBridgeSdbTrTotFtrs	1.3.6.1.4.1.52.4.1.2.3.6.1	INTEGER	read-only	The total number of Token Ring filters in the special database.
ctBridgeSr	1.3.6.1.4.1.52.4.1.2.3.3
INT ctBridgeSrConfigPortType	1.3.6.1.4.1.52.4.1.2.3.3.2	INTEGER	read-write	This object selects the type of Bridging performed on a given bridge port. It is used by the bridge to determine if conversion from a Source Routing packet to a Transparent packet or vice verse is required.
INT ctBridgeSrPortPairDestPort	1.3.6.1.4.1.52.4.1.2.3.3.1.1.2	INTEGER	read-only	The destination port (ie the port which transmitted the packets) for which this entry has source routing information.
ctBridgeSrPortPairEntry	1.3.6.1.4.1.52.4.1.2.3.3.1.1		not-accessible	An entry consisting of objects specifying information for the source and destination port pairs used for source routing.
CTR ctBridgeSrPortPairPackets	1.3.6.1.4.1.52.4.1.2.3.3.1.1.3	Counter	read-only	The number of packets forward by the source route bridge from the SrcPort to the DestPort.
INT ctBridgeSrPortPairSrcPort	1.3.6.1.4.1.52.4.1.2.3.3.1.1.1	INTEGER	read-only	The source port (ie the port which received the packets) for which this entry has source routing information.
INT ctBridgeSrPortPairState	1.3.6.1.4.1.52.4.1.2.3.3.1.1.4	INTEGER	read-write	The state of source route bridging on this port pair. This is the desired state of the administrator. The operational state of the port pair is determined by this state along with the states of dot1dStpPortState within the IETF Bridge MIB and ifOperStatus of the IETF MIB II for each port.
ctBridgeSrPortPairTable	1.3.6.1.4.1.52.4.1.2.3.3.1		not-accessible	A table containing information of source and destination port pairs for source routing.
ctBridgeStp	1.3.6.1.4.1.52.4.1.2.3.2
INT ctBridgeStpProtocolSpecification	1.3.6.1.4.1.52.4.1.2.3.2.1	INTEGER	read-write	This object allows the network manager to select which Spanning Tree Protocol will be operational on the bridge. The value 'decLb100(2)' indicates the DEC LANbridge 100 Spanning Tree protocol. The value 'ieee8021d(3)' indicates the IEEE 802.1d Spanning Tree Protocol. The value 'none(1)' indicates no Spanning Tree Protocol is operational.
ctBridgeTp	1.3.6.1.4.1.52.4.1.2.3.4
INT ctBridgeTpPortPairDestPort	1.3.6.1.4.1.52.4.1.2.3.4.1.1.2	INTEGER	read-only	The destination port (ie the port which the packets were transmitted out) for which this entry has transparent bridge information.
ctBridgeTpPortPairEntry	1.3.6.1.4.1.52.4.1.2.3.4.1.1		not-accessible	An entry consisting of objects specifying information for the source and destination port pairs used for transparent bridging.
CTR ctBridgeTpPortPairPackets	1.3.6.1.4.1.52.4.1.2.3.4.1.1.3	Counter	read-only	The number of packets transparently forwarded by the bridge from the SrcPort to the DestPort.
INT ctBridgeTpPortPairSrcPort	1.3.6.1.4.1.52.4.1.2.3.4.1.1.1	INTEGER	read-only	The source port (ie the port which received the packets) for which this entry has transparent bridge information.
INT ctBridgeTpPortPairState	1.3.6.1.4.1.52.4.1.2.3.4.1.1.4	INTEGER	read-write	The state of transparent bridging on this port pair. This is the desired state of the administrator. The operational state of the port pair is determined by this state along with the states of dot1dStpPortState within the IETF Bridge MIB and ifOperStatus of the IETF MIB II for each port.
ctBridgeTpPortPairTable	1.3.6.1.4.1.52.4.1.2.3.4.1		not-accessible	A table containing information of source and destination port pairs for transparent MAC briding.
ctBridgeTransTrEnet	1.3.6.1.4.1.52.4.1.2.3.7
INT ctBridgeTransTrEnetAARP	1.3.6.1.4.1.52.4.1.2.3.7.5	INTEGER	read-write	This object selects the CSMA/CD frame format (ie Ethernet or IEEE 802.3 w/snap) to which the bridge translates an Appletalk ARP Token Ring packet. This selection is overidden by the learned format when ctBridgeTransTrEnetAutoMode is enabled and the format has been learned.
INT ctBridgeTransTrEnetAutoMode	1.3.6.1.4.1.52.4.1.2.3.7.1	INTEGER	read-write	This object selects whether the auto translation mode is enabled. Auto translation means a bridge learns, from the CSMA/CD ports, which frame format (ie Ethernet or IEEE 802.3 w/snap) a source address is using. Subsequently, the bridge will translate a Token Ring packet, destined to the learned address, with the learned format.
INT ctBridgeTransTrEnetDualMode	1.3.6.1.4.1.52.4.1.2.3.7.2	INTEGER	read-write	This object selects whether dual mode is enabled. Dual mode means a bridge translates a Token Ring broadcast or multicast packet to both CSMA/CD frame formats (ie Ethernet and IEEE 802.3 w/snap) when the format has not previously been learned.
ctBridgeTransTrEnetIBMEntry	1.3.6.1.4.1.52.4.1.2.3.7.7.1		not-accessible	This entry contains the SAP value of an IBM protocol that is to be translated to Ethernet. The value of the Ethernet type field used in the translation is 80D5. Only SAP values whose entry is enabled will be translated to Ethernet. All other Token Ring packets not having a snap will be translated as an 802.3/802.2 formatted packet.
INT ctBridgeTransTrEnetIBMIndex	1.3.6.1.4.1.52.4.1.2.3.7.7.1.1	INTEGER	read-only	The index of an entry in the Token Ring to Ethernet Translation table for IBM protocols. The index ranges from 1 to 20.
OCT ctBridgeTransTrEnetIBMSap	1.3.6.1.4.1.52.4.1.2.3.7.7.1.2	OCTET STRING	read-write	The SAP value of an IBM protocol. The bridge will translate all Token Ring/802.5 packets without a snap header having this SAP value to Ethernet packets with the Ethernet type field set to 80D5. The SAP value is one octet.
INT ctBridgeTransTrEnetIBMState	1.3.6.1.4.1.52.4.1.2.3.7.7.1.3	INTEGER	read-write	The state of this entry. A value of 2 indicates that this entry will not be used in the bridge's translation decisions.
ctBridgeTransTrEnetIBMTable	1.3.6.1.4.1.52.4.1.2.3.7.7		not-accessible	A table containing SAP (Service Access Point) values of IBM protocols that the bridge will translate from Token Ring (802.5 w/o snap) to Ethernet.
INT ctBridgeTransTrEnetIP	1.3.6.1.4.1.52.4.1.2.3.7.4	INTEGER	read-write	This object selects the CSMA/CD frame format (ie Ethernet or IEEE 802.3 w/snap) to which the bridge translates an IP Token Ring packet including ARP packets. This selection is overidden by the learned format when ctBridgeTransTrEnetAutoMode is enabled and the format has been learned.
INT ctBridgeTransTrEnetNovAdd	1.3.6.1.4.1.52.4.1.2.3.7.6	INTEGER	read-write	This object selects the bit ordering of the Hardware Addresses located in the 'data field' of a Token Ring NOVELL packet. The 'data field' includes all bytes of the packet excluding the MAC Header and CRC. The Hardware Addresses in the MAC Header are always MSB for Token Ring packets. The default value is 2.
INT ctBridgeTransTrEnetNovell	1.3.6.1.4.1.52.4.1.2.3.7.3	INTEGER	read-write	This object selects the CSMA/CD frame format (ie Ethernet or IEEE 802.3 w/snap) to which the bridge translates a Novell Token Ring packet. This selection is overidden by the learned format when ctBridgeTransTrEnetAutoMode is enabled and the format has been learned.
ctBridgeTransTrEnetSnapEntry	1.3.6.1.4.1.52.4.1.2.3.7.9.1		not-accessible	This entry contains an Ethernet type field value and its associated state.
INT ctBridgeTransTrEnetSnapFormat	1.3.6.1.4.1.52.4.1.2.3.7.8	INTEGER	read-write	This object selects the CSMA/CD frame format (ie Ethernet or IEEE 802.3 w/snap) to which the bridge translates all Token Ring packets with a snap header whose Ethernet type resides in the ctBridgeTransTrEnetSnapTable and is enabled. This selection is overidden by the learned format when ctBridgeTransTrEnetAutoMode is enable and the format has been learned.
INT ctBridgeTransTrEnetSnapIndex	1.3.6.1.4.1.52.4.1.2.3.7.9.1.1	INTEGER	read-only	The index of an entry in the Token Ring to Ethernet Translation table for Ethernet type fields. The index ranges from 1 to 20.
INT ctBridgeTransTrEnetSnapState	1.3.6.1.4.1.52.4.1.2.3.7.9.1.3	INTEGER	read-write	The state of this entry. A value of 2 indicates that this entry will not be used in the bridge's translation decisions.
ctBridgeTransTrEnetSnapTable	1.3.6.1.4.1.52.4.1.2.3.7.9		not-accessible	A table containing Ethernet type field entries that the bridge will use to determine how to translate a Token Ring (802.5 w/snap) packet to a CSMA/CD packet. If a received Token Ring packet matches the Ethernet type field of an enabled entry, the bridge will translate the Token Ring packet to the frame format specified by ctBridgeTransTrEnetSnapFormat. Else, it will translate the packet to the opposite frame format.
OCT ctBridgeTransTrEnetSnapType	1.3.6.1.4.1.52.4.1.2.3.7.9.1.2	OCTET STRING	read-write	The Ethernet type field value which the bridge will translate all Token Ring/802.5 packets with a snap header having this type to the format specified by ctBridgeTransTrEnetSnapFormat. The Ethernet type field value is two octets.
TIK ctPvstLastTopologyChange	1.3.6.1.4.1.52.4.1.2.3.2.2.4	TimeTicks	read-only	This summary object contains the value of sysUpTime when any of the rows in ctPvstStpTable last incremented ctPvstStpTopChanges. Poll this object to determine if any of the STP instances had topology changes.
INT ctPvstMaxNumStp	1.3.6.1.4.1.52.4.1.2.3.2.2.2	INTEGER	read-only	Returns maximum number of spanning trees that this device can implement. This will limit the number of VLANs that can be configured with distinct spanning trees.
INT ctPvstNumStps	1.3.6.1.4.1.52.4.1.2.3.2.2.3	INTEGER	read-write	When read, this returns the number of PVST spanning trees active in the switch, which should correspond to the number of entries in ctPvstStpTable. When written with 4094, it should create a spanning tree for each currently configured VLAN. If a switch cannot create as many spanning trees as configured VLANs, this write should return an error. Writing any value other than 4094 should return an error.
INT ctPvstStpBridgeForwardDelay	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.15	INTEGER	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 ctPvstStpBridgeMaxAge. 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 ctPvstStpBridgeHelloTime	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.14	INTEGER	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 ctPvstStpBridgeMaxAge	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.13	INTEGER	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 ctPvstStpBridgeHelloTime. 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 ctPvstStpDesignatedRoot	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.6	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.
ctPvstStpEntry	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1		not-accessible	An entry related to a specific spanning tree.
INT ctPvstStpForwardDelay	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.12	INTEGER	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 ctPvstStpBridgeForwardDelay which is the value that this bridge and all others would start using if/when this bridge were to become the root.]
INT ctPvstStpHelloTime	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.10	INTEGER	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 ctPvstStpHoldTime	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.11	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.
INT ctPvstStpMaxAge	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.9	INTEGER	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 ctPvstStpMode	1.3.6.1.4.1.52.4.1.2.3.2.2.1	INTEGER	read-write	Specifies whether the switch is in 802.1D/Q single spanning tree mode, or PVST mode. If the switch is configured with PVST information for some VLANs, setting this object to dot1qMode(1) will cause it to ignore the PVST settings and move all VLANs into the single 802.1Q spanning tree.
INT ctPvstStpPort	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1.2	INTEGER	read-only	The port number of the port for which this entry contains Spanning Tree Protocol management information.
BRI ctPvstStpPortDesignatedBridge	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1.9	BridgeId	read-only	The Bridge Identifier of the bridge which this port considers to be the Designated Bridge for this port's segment.
INT ctPvstStpPortDesignatedCost	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1.8	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 ctPvstStpPortDesignatedPort	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1.10	OCTET STRING	read-only	The Port Identifier of the port on the Designated Bridge for this port's segment.
BRI ctPvstStpPortDesignatedRoot	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1.7	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 ctPvstStpPortEnable	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1.5	INTEGER	read-write	The enabled/disabled status of the port.
ctPvstStpPortEntry	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1		not-accessible	A port entry related to a specific spanning tree. Only ports which are in a VLAN which is running a PVST should be reported for that VLAN.
CTR ctPvstStpPortForwardTransitions	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1.11	Counter	read-only	The number of times this port has transitioned from the Learning state to the Forwarding state.
INT ctPvstStpPortPathCost	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1.6	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 ctPvstStpPortPriority	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1.3	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 ctPvstStpPort.
INT ctPvstStpPortState	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1.4	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 ctPvstStpPortEnable), this object will have a value of disabled(1).
ctPvstStpPortTable	1.3.6.1.4.1.52.4.1.2.3.2.2.6		not-accessible	A collection of per-port spanning tree objects per VLAN.
INT ctPvstStpPortVlanId	1.3.6.1.4.1.52.4.1.2.3.2.2.6.1.1	INTEGER	read-only	The VLAN-ID of the VLAN on which this spanning tree is running.
INT ctPvstStpPriority	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.3	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.
INT ctPvstStpProtocolSpecification	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.2	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.
INT ctPvstStpRootCost	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.7	INTEGER	read-only	The cost of the path to the root as seen from this bridge.
INT ctPvstStpRootPort	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.8	INTEGER	read-only	The port number of the port which offers the lowest cost path from this bridge to the root bridge.
ctPvstStpTable	1.3.6.1.4.1.52.4.1.2.3.2.2.5		not-accessible	A collection of spanning tree objects per VLAN.
TIK ctPvstStpTimeSinceTopologyChange	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.4	TimeTicks	read-only	The time (in hundredths of a second) since the last time a topology change was detected by the bridge entity.
CTR ctPvstStpTopChanges	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.5	Counter	read-only	The total number of topology changes detected by this bridge since the management entity was last reset or initialized.
INT ctPvstStpVlanId	1.3.6.1.4.1.52.4.1.2.3.2.2.5.1.1	INTEGER	read-write	The VLAN-ID of the VLAN on which this spanning tree is running. Writing a VLAN-ID will create a separate spanning tree for that VLAN, if it previously was part of the single 802.1Q VLAN.

RFC description

Cabletron Systems legacy vendor MIB for bridge and switching management; defines OIDs for bridge forwarding, spanning tree, and L2 switching operations.

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RFC description