The Bridge MIB module for managing devices that support IEEE 802.1D. read-only current 1.3.6.1.2.1.17.1.1 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 dot1dStpPriority a unique BridgeIdentifier is formed which is used in the Spanning Tree Protocol. "1x:" read-only current 1.3.6.1.2.1.17.1.2 The number of ports controlled by this bridging entity. read-only current 1.3.6.1.2.1.17.1.3 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. 1 2 3 4 read-only current 1.3.6.1.2.1.17.1.1 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 dot1dStpPriority a unique BridgeIdentifier is formed which is used in the Spanning Tree Protocol. "1x:" read-only current 1.3.6.1.2.1.17.1.2 The number of ports controlled by this bridging entity. read-only current 1.3.6.1.2.1.17.1.3 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. 1 2 3 4 not-accessible current 1.3.6.1.2.1.17.1.4.1 A list of information for each port of the bridge. read-only current 1.3.6.1.2.1.17.2.1 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. 1 2 3 read-write current 1.3.6.1.2.1.17.2.2 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. Permissible values are 0-61440, in steps of 4096. read-only current 1.3.6.1.2.1.17.2.3 The time (in hundredths of a second) since the last time a topology change was detected by the bridge entity. For RSTP, this reports the time since the tcWhile timer for any port on this Bridge was non-zero. read-only current 1.3.6.1.2.1.17.2.4 The total number of topology changes detected by this bridge since the management entity was last reset or initialized. read-only current 1.3.6.1.2.1.17.2.5 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. read-only current 1.3.6.1.2.1.17.2.6 The cost of the path to the root as seen from this bridge. read-only current 1.3.6.1.2.1.17.2.7 The port number of the port which offers the lowest cost path from this bridge to the root bridge. read-only current 1.3.6.1.2.1.17.2.8 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. read-only current 1.3.6.1.2.1.17.2.9 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. read-only current 1.3.6.1.2.1.17.2.10 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. read-only current 1.3.6.1.2.1.17.2.11 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 dot1dStpBridgeForwardDelay which is the value that this bridge and all others would start using if/when this bridge were to become the root.] read-write current 1.3.6.1.2.1.17.2.12 The value that all bridges use for MaxAge when this bridge is acting as the root. Note that 802.1D-1998 specifies that the range for this parameter is related to the value of dot1dStpBridgeHelloTime. The granularity of this timer is specified by 802.1D-1998 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. read-write current 1.3.6.1.2.1.17.2.13 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-1998 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. read-write current 1.3.6.1.2.1.17.2.14 The value that all bridges use for ForwardDelay when this bridge is acting as the root. Note that 802.1D-1998 specifies that the range for this parameter is related to the value of dot1dStpBridgeMaxAge. The granularity of this timer is specified by 802.1D-1998 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. read-only current 1.3.6.1.2.1.17.2.1 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. 1 2 3 read-write current 1.3.6.1.2.1.17.2.2 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. Permissible values are 0-61440, in steps of 4096. read-only current 1.3.6.1.2.1.17.2.3 The time (in hundredths of a second) since the last time a topology change was detected by the bridge entity. For RSTP, this reports the time since the tcWhile timer for any port on this Bridge was non-zero. read-only current 1.3.6.1.2.1.17.2.4 The total number of topology changes detected by this bridge since the management entity was last reset or initialized. read-only current 1.3.6.1.2.1.17.2.5 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. read-only current 1.3.6.1.2.1.17.2.6 The cost of the path to the root as seen from this bridge. read-only current 1.3.6.1.2.1.17.2.7 The port number of the port which offers the lowest cost path from this bridge to the root bridge. read-only current 1.3.6.1.2.1.17.2.8 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. read-only current 1.3.6.1.2.1.17.2.9 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. read-only current 1.3.6.1.2.1.17.2.10 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. read-only current 1.3.6.1.2.1.17.2.11 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 dot1dStpBridgeForwardDelay which is the value that this bridge and all others would start using if/when this bridge were to become the root.] read-write current 1.3.6.1.2.1.17.2.12 The value that all bridges use for MaxAge when this bridge is acting as the root. Note that 802.1D-1998 specifies that the range for this parameter is related to the value of dot1dStpBridgeHelloTime. The granularity of this timer is specified by 802.1D-1998 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. read-write current 1.3.6.1.2.1.17.2.13 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-1998 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. read-write current 1.3.6.1.2.1.17.2.14 The value that all bridges use for ForwardDelay when this bridge is acting as the root. Note that 802.1D-1998 specifies that the range for this parameter is related to the value of dot1dStpBridgeMaxAge. The granularity of this timer is specified by 802.1D-1998 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. not-accessible current 1.3.6.1.2.1.17.2.15.1 A list of information maintained by every port about the Spanning Tree Protocol state for that port. read-only current 1.3.6.1.2.1.17.4.1 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. read-write current 1.3.6.1.2.1.17.4.2 The timeout period in seconds for aging out dynamically learned forwarding information. 802.1D-1998 recommends a default of 300 seconds. read-only current 1.3.6.1.2.1.17.4.1 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. read-write current 1.3.6.1.2.1.17.4.2 The timeout period in seconds for aging out dynamically learned forwarding information. 802.1D-1998 recommends a default of 300 seconds. not-accessible current 1.3.6.1.2.1.17.4.3.1 Information about a specific unicast MAC address for which the bridge has some forwarding and/or filtering information. not-accessible current 1.3.6.1.2.1.17.4.4.1 A list of information for each port of a transparent bridge. not-accessible current 1.3.6.1.2.1.17.5.1.1 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. read-only current 1.3.6.1.2.1.17.1.4.1.1 The port number of the port for which this entry contains bridge management information. read-only current 1.3.6.1.2.1.17.1.4.1.2 The value of the instance of the ifIndex object, defined in IF-MIB, for the interface corresponding to this port. "d" read-only current 1.3.6.1.2.1.17.1.4.1.3 For a port which (potentially) has the same value of dot1dBasePortIfIndex 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 multiple ports correspond one- to-one with multiple 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 dot1dBasePortIfIndex, this object can have the value { 0 0 }. read-only current 1.3.6.1.2.1.17.1.4.1.4 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. read-only current 1.3.6.1.2.1.17.1.4.1.5 The number of frames discarded by this port due to an excessive size. It is incremented by both transparent and source route bridges. read-write current 1.3.6.1.2.1.17.2.15.1.2 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 dot1dStpPort. On newer bridges, permissible values are 0-240, in steps of 16. read-only current 1.3.6.1.2.1.17.2.15.1.3 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 dot1dStpPortEnable), this object will have a value of disabled(1). 1 2 3 4 5 6 read-write current 1.3.6.1.2.1.17.2.15.1.4 The enabled/disabled status of the port. 1 2 read-write deprecated 1.3.6.1.2.1.17.2.15.1.5 The contribution of this port to the path cost of paths towards the spanning tree root which include this port. 802.1D-1998 recommends that the default value of this parameter be in inverse proportion to the speed of the attached LAN. New implementations should use dot1dStpPortPathCost32 read-only current 1.3.6.1.2.1.17.2.15.1.6 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. read-only current 1.3.6.1.2.1.17.2.15.1.7 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. read-only current 1.3.6.1.2.1.17.2.15.1.8 The Bridge Identifier of the bridge which this port considers to be the Designated Bridge for this port's segment. read-only current 1.3.6.1.2.1.17.2.15.1.9 The Port Identifier of the port on the Designated Bridge for this port's segment. read-only current 1.3.6.1.2.1.17.2.15.1.10 The number of times this port has transitioned from the Learning state to the Forwarding state. read-write current 1.3.6.1.2.1.17.2.15.1.11 The contribution of this port to the path cost of paths towards the spanning tree root which include this port. 802.1D-1998 recommends that the default value of this parameter be in inverse proportion to the speed of the attached LAN. The permissible values must be extended to 1-200,000,000. Replacement for deprecated object dot1dStpPortPathCost read-only current 1.3.6.1.2.1.17.4.3.1.1 A unicast MAC address for which the bridge has forwarding and/or filtering information. "1x:" read-only current 1.3.6.1.2.1.17.4.3.1.2 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 dot1dTpFdbAddress 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 dot1dStaticTable). Implementors are encouraged to assign the port value to this object whenever it is learned even for addresses for which the corresponding value of dot1dTpFdbStatus is not learned(3). read-only current 1.3.6.1.2.1.17.4.3.1.3 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 dot1dTpFdbPort, nor an entry in the dot1dStaticTable) is being used to determine if and how frames addressed to the value of the corresponding instance of dot1dTpFdbAddress 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 dot1dTpFdbPort was learned, and is being used. self(4) - the value of the corresponding instance of dot1dTpFdbAddress represents one of the bridge's addresses. The corresponding instance of dot1dTpFdbPort indicates which of the bridge's ports has this address. mgmt(5) - the value of the corresponding instance of dot1dTpFdbAddress is also the value of an existing instance of dot1dStaticAddress. 1 2 3 4 5 read-only current 1.3.6.1.2.1.17.4.4.1.2 The maximum size of the INFO (non-MAC) field that this port will receive or transmit. read-only current 1.3.6.1.2.1.17.4.4.1.3 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. read-only current 1.3.6.1.2.1.17.4.4.1.4 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. read-only current 1.3.6.1.2.1.17.4.4.1.5 Count of valid frames received which were discarded (i.e., filtered) by the Forwarding Process. read-write current 1.3.6.1.2.1.17.5.1.1.1 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. "1x:" read-write current 1.3.6.1.2.1.17.5.1.1.2 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. read-write current 1.3.6.1.2.1.17.5.1.1.3 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. This exceeds the minimum required SNMP packet size supported. This is sufficient to allow the maximum 4096 ports now supported. read-write current 1.3.6.1.2.1.17.5.1.1.4 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. 1 2 3 4 5 The Bridge-Identifier as used in the Spanning Tree Protocol to uniquely identify a bridge. Its first two octets (in network byte order) contain a priority value and its last 6 octets contain the MAC address used to refer to a bridge in a unique fashion (typically, the numerically smallest MAC address of all ports on the bridge). A STP timer in units of 1/100 seconds. To convert a Timeout value into a value in units of 1/256 seconds, the following algorithm should be used: b = floor( (n * 256) / 100) where: floor = quotient [ignore remainder] n is the value in 1/100 second units b is the value in 1/256 second units To convert the value from 1/256 second units back to 1/100 seconds, the following algorithm should be used: n = ceiling( (b * 100) / 256) where: ceiling = quotient [if remainder is 0], or quotient + 1 [if remainder is non-zero] n is the value in 1/100 second units b is the value in 1/256 second units Note: it is important that the arithmetic operations are done in the order specified (i.e., multiply first, divide second).