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XG2000 series User's Guide
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All Rights Reserved, Copyright (C) PFU LIMITED 2009
Switch Information for Spanning Tree
General Spanning Tree Protocol information is displayed.
z Spanning Tree
The operational state of the Spanning Tree Protocol is displayed.
− Disabled
Spanning Tree Protocol is disabled.
− Enabled
Spanning Tree Protocol is enabled.
z Root Switch Priority
The priority value for the switch selected as the root switch is displayed as a decimal number.
z Root Switch ID
The switch identifier selected as the root switch is displayed.
The first four digits representing the priority of the root switch are displayed as a
hexadecimal number.
The remaining 12 digits representing the MAC address of the root switch are displayed as
a hexadecimal number.
z Root Path Cost
The path cost value from the device to the root switch.
When the device is the root switch, "0" is displayed.
z Root Port
The switch port number of the root port of the device is displayed.
When the device is the root switch, "---" is displayed.
z Switch Priority
The priority value of the device is displayed as a decimal number.
z Switch ID
The switch identifier priority for the device is displayed.
The first four digits representing the priority of the device are displayed as a hexadecimal
number.
The remaining 12 digits representing the MAC address of the device are displayed as a
hexadecimal number.
z Max Age
The maximum valid time (seconds) for BPDU's are displayed.
z Hello Time
The transmit interval (seconds) for BPDU's are displayed.
z Forward Time
The time a port requires to switch states.
z Topology Changes
The number of times the topology changed is displayed.
z Last Topology Change
The latest date and time the topology change occurred is displayed.
z portfast errdisable timeout
The state of errdisable-timeout function is displayed.
− disabled
The errdisable-timeout function is disabled.
− enabled
The errdisable-timeout function is enabled.
z portfast errdisable timeout interval
The timeout value (seconds) for canceling a port down condition when the errdisable-timeout
function is enabled is displayed.
Ports Information for Spanning Tree
The Spanning Tree Protocol information for each switch port is displayed.
z Port
The switch port number is displayed.
z Port State
The STP state of the switch port is displayed.
− Down
Indicates that the switch port is in link down state.
− Discard
The switch port does not send/receive frames other than BPDUs.
− Learn
The switch port is in learning state. The source MAC address for received frames is
learned, but frames are not forwarded.
− Forward
The switch port is ready to transmit data traffic.
For RSTP (IEEE802.1w), "Blocking" and "Listening" states of STP are merged as the "Discarding"
State. The po
rt states between STP (IEEE802.1D) and RSTP (IEEE802.1w) correspond as follows:
Display
format
STP(IEEE802.1D) RSTP(IEEE802.1w)
Block Blocking Discarding
Listen Listening Discarding
Learn Learning Learning
Forward Forwarding Forwarding
For a switch port that does not use STP, the state will be either "Forward" or "Down."