Dell PowerConnect B-FCXs User Manual page 134

4
Configuring STP
The STP statistic display contains the following information.
STP Bridge Parameters
Root ID
Root Cost
Root Port
Priority
Max.Age
Hello Time
Hold Time
Fwd Delay
Topology Last Change
Topology Change Counter
Bridge Address
STP Port Parameters
Port
Priority
Path Cost
State
Forward Transition
124
The ID assigned by STP to the root bridge for this spanning tree.
The cumulative cost from this bridge to the root bridge. If this device is the root
bridge, then the root cost is 0.
The port on this device that connects to the root bridge. If this device is the root
bridge, then the value is "Root" instead of a port number.
A parameter used to identify the root bridge in a spanning tree (instance of STP).
The bridge with the lowest value has the highest priority and is the root.
The number of seconds this device or VLAN waits for a hello message from the root
bridge before deciding the root has become unavailable and performing a
reconvergence.
The interval between each configuration BPDU sent by the root bridge.
The minimum number of seconds that must elapse between transmissions of
consecutive Configuration BPDUs on a port.
The number of seconds this device or VLAN waits following a topology change and
consequent reconvergence.
The number of seconds since the last time a topology change occurred.
The number of times the topology has changed since this device was reloaded.
The STP address of this device or VLAN.
The port number.
The preference that STP gives this port relative to other ports for forwarding traffic
out of the spanning tree. A higher numerical value means a lower priority.
The port's STP path cost.
The port's STP state. The state can be one of the following:
•
BLOCKING – STP has blocked Layer 2 traffic on this port to prevent a loop. The
device or VLAN can reach the root bridge using another port, whose state is
FORWARDING. When a port is in this state, the port does not transmit or
receive user frames, but the port does continue to receive STP BPDUs.
•
DISABLED – The port is not participating in STP. This can occur when the port
is disconnected or STP is disabled on the port.
•
FORWARDING – STP is allowing the port to send and receive frames.
•
LISTENING – STP is responding to a topology change and this port is listening
for a BPDU from neighboring bridges in order to determine the new topology.
No user frames are transmitted or received during this state.
•
LEARNING – The port has passed through the LISTENING state and will change
to the BLOCKING or FORWARDING state, depending on the results of STP's
reconvergence. The port does not transmit or receive user frames during this
state. However, the device can learn the MAC addresses of frames that the
port receives during this state and make corresponding entries in the MAC
table.
The number of times STP has changed the state of this port between BLOCKING
and FORWARDING.
PowerConnect B-Series FCX Web Management Interface User Guide
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