Network OS MIB Reference
Network OS MIB Reference
Network OS 2.1.1
53-1002490-01
documentation@brocade.com


Bridge-MIB Objects : Bridge-MIB

Bridge-MIB
The Bridge-MIB is the MIB module for managing devices that support IEEE 802.1D.
NOTE: The Bridge-MIB objects are not supported in Virtual Cluster Switching (VCS) mode.
Bridge-MIB traps
 
This notification indicates that the sending agent is the new root of the spanning tree. It is sent by a bridge soon after its election as the new root.
This notification is sent by a bridge when any of its configured ports transits from Learning state to Forwarding state or from the Forwarding state to the Blocking state. It is not sent if a newRoot notification is sent for the same transition.
dot1d base group
This contains the objects that are applicable to all types of bridges (support only for default VLAN).
 
Not accessible
The MAC address used by this bridge when it must be referred in a unique fashion. It is recommended that this be the numerically smallest MAC address of all ports that belong to this bridge.
This object indicates what type of bridging this bridge can perform. If a bridge is actually performing a certain type of bridging, this is indicated by the entries in the port table for the given type.
Not accessible
A table that contains generic information about every port that is associated with this bridge. Transparent, source route, and srt ports are included.
Not accessible
This object contains the name of an object unique to this port. For example, when multiple ports correspond one-to-one with multiple X.25 virtual circuits, this value might identify an object instance (for example, the first) associated with the X.25 virtual circuit corresponding to this port.
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.
The number of frames discarded by this port due to an excessive size. It is incremented by both transparent and source route bridges.
dot1d STP group
Implementation of the dot1dStp sub-tree is optional. It is implemented by those bridges that support the Spanning Tree Protocol.
 
Not accessible
The value of the writable portion of the bridge ID (that is, 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.
The time (in hundredths of a second) when the last time a topology change was detected by the bridge entity. For RSTP, this reports the time when the tcWhile timer for any port on this bridge was non-zero.
The total number of topology changes detected by this bridge since the management entity was last reset or initialized.
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.
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.
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.
This time value determines the interval length during which no more than two configuration bridge protocol data units (PDUs) are transmitted by this node, in units of hundredths of a second.
This time value, measured in units of hundredths of a second, controls how fast a port changes its spanning state when moving toward 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.
The value that all bridges use for MaxAge when the bridge is acting as the root. 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 one second. An agent may return a badValue error if a set is attempted to a value that is not a whole number of seconds.
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 one second. An agent may return a badValue error if a set is attempted to a value that is not a whole number of seconds.
The value that all bridges use for ForwardDelay when this bridge is acting as the root. 802.1D-1998 specifies that the range for this parameter is related to the value of ot1dStpBridgeMaxAge. The granularity of this timer is specified by 802.1D-1998 to be one second. An agent may return a badValue error if a set is attempted to a value that is not a whole number of seconds.
Not accessible
Not accessible
The value of the priority field that 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.
The current state of the port, as defined by application of the Spanning Tree Protocol. This state controls what action a port takes on reception of a frame.
The contribution of this port to the path cost of paths toward 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 unique bridge identifier of the bridge recorded as the root in the configuration bridge BPDUs transmitted by the designated bridge for the segment to which the port is attached.
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.
The contribution of this port to the path cost of paths toward 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. This object replaces dot1dStpPortPathCost to support IEEE 802.1t.
dot1dTp group
Implementation of the dot1dTp sub-tree is optional. It is implemented by those bridges that support the transparent bridging mode. A transparent or SRT bridge implements this sub-tree.
 
Not accessible
A table that contains information about unicast entries for which the bridge has forwarding and filtering information. This information is used by the transparent bridging function in determining how to propagate a received frame.
Not accessible
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 or filtering information about this address.
other (1) - 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 no longer valid (for example, 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 addresses of the bridge. The corresponding instance of dot1dTpFdbPort indicates which of the bridge ports has this address.
mgmt (5) - The value of the corresponding instance of dot1dTpFdbAddress is also the value of an existing instance of dot1dStaticAddress.
Not accessible
Not accessible
NOTE:
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 the bridge management frames.
NOTE:
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 the bridge management frames.
dot1d static group
 
Not accessible
A table containing filtering information configured into the bridge by (local or network) management specifying the set of ports to which frames received from specific ports and containing specific destination addresses are allowed to be forwarded.
Not accessible
The filtering information configured into the bridge by (local or network) management specifying the set of ports to which the frames received from a specific port and containing a specific destination address are allowed to be forwarded.
The destination MAC address in a frame to which filtering information of this entry applies. This object can take the value of a unicast address, a group address, or the broadcast address.
The port number from which a frame must be received in order for the filtering information of this entry 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.
The set of ports to which frames received from a specific port and destined for a specific MAC address are allowed to be forwarded.
other (1) - This entry is currently in use, but the conditions under which it remains so differ from the following values.

Bridge-MIB Objects : Bridge-MIB