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TRENDnet User's Guide
Configure Spanning Tree Protocol port settings
Bridge > Spanning Tree > Port Settings
1. Log into your switch management page (see
on page 11).
2. Click on Bridge, click on Spanning Tree, and click on Port Settings.
3. Review the settings. For each entry, click Apply to save changes.
STP Status: Indicates if spanning tree protocol is active or not on the port.
Select one of the following choices from the pull-down menu:
o
Enable - The spanning tree protocol is enabled on the port.
o
Disabled - The spanning tree protocol is disabled on the port. Enable
Disable
Note: BPDU passthrough must be disabled for all ports under Physical
interface for STP can be enabled.
Priority: Indicates the port priority. If two paths have the same port cost, the
bridges must select a preferred path. In some instances this can involve the use
of the port priority parameter which is used as a tie breaker when two paths
have the same cost.
The range for port priority is 0 to 240. As with bridge priority, this range is
broken into increments, in this case multiples of 16. To select a port priority for
a port, you enter the desired value. Table 1 lists the values that are valid.
Valid Port Priority Values
Step
1
2
3
4
5
6
Port
0 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
Priority
Admin Cost (0 = Auto): The administratively assigned value for the contribution
of this port to the path cost of paths towards the spanning tree root. Writing a
value of '0' assigns the automatically calculated default Path Cost value to the
port. If the default Path Cost is being used, this object returns '0' when read.
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External Cost: This defines a metric that indicates the relative cost of
forwarding packets to the specified port list. Port cost can be set automatically
or as a metric value. Define a value between 1 and 200000000 to determine
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the external cost. The lower the number, the greater the probability the port
will be chosen to forward packets. The default port cost: 100Mbps port =
200000. Gigabit port = 20000.
State – Displays the current port spanning tree state.
o
o
o
o
o
Edge: Indicates if a port is connected to an edge device in the network topology
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or not. Selecting the Forcetrue parameter designates the port as an edge port.
Edge ports cannot create loops, however an edge port can lose edge port
status if a topology change creates a potential for a loop. An edge port
normally should not receive BPDU packets. If a BPDU packet is received, it
automatically loses edge port status. Selecting the Forcefalse parameter
indicates that the port does not have edge port status. Selecting the Auto
parameter indicates that the port have edge port status or not have edge port
status automatically. The default setting for this parameter is Auto.
Blocking - A blocking state does not allow network traffic to be sent or
received on a the port except for BPDU data. A port with a higher path
cost to the root bridge than another on the switch causes a switching
loop and is placed in the blocking state by the Spanning Tree
algorithm. The port's state may change to the forwarding state if the
other links in use fail and the Spanning Tree algorithm determines the
port may transition to the forwarding state.
Listening - This state occurs on a port during the convergence process.
The port in the listening state processes BPDUs and awaits new
information that would cause the port to return to the blocking state.
Learning - While the port does not yet forward frames (packets), in
this state the port does learn source addresses from frames received
and adds them to the filtering (switching) database.
Forwarding - A port that both receives and sends data. This indicates
normal operation. STP continues to monitor the port for incoming
BPDUs that indicate the port should return to the blocking state to
prevent a loop.
Disabled - This state is not strictly part of STP. However, a network
administrator can manually disable a port.
TEG-30102WS
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