D-Link DWL-8600AP User Manual page 251

D-Link UWS User Manual
Table 135: Spanning Tree CST Port Configuration/Status Fields (Cont.)
Field
Port Forwarding State
Port Role
Designated Root
Designated Cost
Designated Bridge
Designated Port
Topology Change
Acknowledge
Auto Edge
Edge Port
Point-to-point MAC
Root Guard
Loop Guard
TCN Guard
CST Regional Root
CST Path Cost
Loop Inconsistent State
D-Link
Oct. 2015
Description
Indicates the current state of a port. If enabled, the port state determines
what forwarding action is taken on traffic. Possible port states are:
• Disabled: is currently disabled on the port. The port forwards traffic while
learning MAC addresses.
• Blocking: The port is currently blocked and cannot be used to forward
traffic or learn MAC addresses.
• Listening: The port is currently in the listening mode. The port cannot
forward traffic nor can it learn MAC addresses.
• Learning: The port is currently in the learning mode. The port cannot
forward traffic, however, it can learn new MAC addresses.
• Forwarding: The port is currently in the forwarding mode. The port can
forward traffic and learn new MAC addresses.
Each MST Bridge Port that is enabled is assigned a Port Role for each spanning
tree. The port role will be one of the following values: Root Port, Designated
Port, Alternate Port, Backup Port, Master Port or Disabled Port.
Root Bridge for the CST. It is made up using the bridge priority and the base
MAC address of the bridge.
Displays cost of the port participating in the topology. Ports with a lower cost
are less likely to be blocked if detects loops.
Bridge Identifier of the bridge with the Designated Port. It is made up using the
bridge priority and the base MAC address of the bridge.
Port Identifier on the Designated Bridge that offers the lowest cost to the LAN.
It is made up from the port priority and the interface number of the port.
Identifies whether the next BPDU to be transmitted for this port would have
the topology change acknowledgement flag set. It is either "True" or "False".
Configuring the auto edge mode of a port allows the port to become an edge
port if it does not see BPDUs for some duration. The possible values are Enable
or Disable.
Indicates whether the port is enabled as an edge port.
Derived value of the point-to-point status.
Configuring the root guard mode sets a port to discard any superior
information received by the port and thus protect against root of the device
from changing. The port gets put into discarding state and does not forward
any packets.The possible values are Enable or Disable.
Configuring the loop guard mode prevents a port from erroneously
transitioning from blocking state to forwarding when the port stops receiving
BPDUs. The port is marked as being in loop-inconsistent state. In this state, the
port does not forward packets. The possible values are Enable or Disable.
Configuring the TCN guard for a port restricts the port from propagating any
topology change information received through that port.The possible values
are Enable or Disable.
Shows the priority and base MAC address of the CST Regional Root.
Shows the path Cost to the CST tree Regional Root.
Identifies whether the port is currently in a loop inconsistent state. If the port
is in a loop inconsistent state, it does not forward packets.
Configuring Spanning Tree Protocol
Unified Wired and Wireless Access System
Page 251