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Configuring Spanning Tree Spanning Tree
User Guide 395
Learning and Forwarding status correspond exactly to the Learning and Forwarding status
specified in STP.
In TP-Link switches, the port status includes: Blocking, Learning, Forwarding and
Disconnected.
â– Blocking
In this status, the port receives and sends BPDUs. The other packets are dropped.
â– Learning
In this status, the port receives and sends BPDUs. It also receives the other user packets to
update its MAC address table, but doesn’t forward them.
â– Forwarding
In this status, the port receives and sends BPDUs. It also receives the other user packets to
update its MAC address table, and forwards them.
â– Disconnected
In this status, the port is enabled with spanning tree function but not connected to any
device.
Path Cost
The path cost reflects the link speed of the port. The smaller the value, the higher link
speed the port has.
The path cost can be manually configured on each port. If not, the path cost values are
automatically calculated according to the link speed as shown below:
Table 1-1 The Default Path Cost Value
Link Speed Path Cost Value
10Mb/s 2,000,000
100Mb/s 200,000
1Gb/s 20,000
10Gb/s 2,000
Root Path Cost
The root path cost is the accumulated path costs from the root bridge to the other
switches. When root bridge sends its BPDU, the root path cost value is 0. When a switch
receives this BPDU, the root path cost wll be increased according to the path cost of the
receive port. Then it create a new BPDU with the new root file cost and forwards it to the
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