Dell PowerConnect FCS624S Web Management Interface User Guide - Page 45

Monitoring STP, The STP contains the following information., STP Bridge Parameters global parameters

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Monitoring STP 3 The STP contains the following information. STP Bridge Parameters (global parameters) Root ID Root Cost Root Port Priority Max Age Hello Time Hold Time Forward Delay Topology Last Change Topology Change Counter Bridge Address STP Port Parameters 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. This device or VLAN's STP priority. The value is shown in hexadecimal format. 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. VLAN Port Priority Path Cost State The VLAN that the port is in. This field appears only when port VLAN is enabled. The port number. The port's STP priority, in hexadecimal format. 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. PowerConnect B-Series FCX Web Management Interface User Guide 35 53-1002268-01

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PowerConnect B-Series FCX Web Management Interface User Guide
35
53-1002268-01
Monitoring STP
3
The STP contains the following information.
STP Bridge Parameters (global parameters)
Root ID
The ID assigned by STP to the root bridge for this spanning tree.
Root Cost
The cumulative cost from this bridge to the root bridge. If this device is the root
bridge, then the root cost is 0.
Root Port
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.
Priority
This device or VLAN’s STP priority. The value is shown in hexadecimal format.
Max Age
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.
Hello Time
The interval between each configuration BPDU sent by the root bridge.
Hold Time
The minimum number of seconds that must elapse between transmissions of
consecutive Configuration BPDUs on a port.
Forward Delay
The number of seconds this device or VLAN waits following a topology change
and consequent reconvergence.
Topology Last Change
The number of seconds since the last time a topology change occurred.
Topology Change Counter
The number of times the topology has changed since this device was reloaded.
Bridge Address
The STP address of this device or VLAN.
STP Port Parameters
VLAN
The VLAN that the port is in. This field appears only when port VLAN is enabled.
Port
The port number.
Priority
The port’s STP priority, in hexadecimal format.
Path Cost
The port’s STP path cost.
State
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.