Stp Port States; Stp Status; Table 10-2 Stp Port States - ZyXEL Communications Dimension ES-3124 User Manual

Dimension ES-3124 Ethernet Switch
Once a stable network topology has been established, all bridges listen for Hello BPDUs (Bridge Protocol Data
Units) transmitted from the root bridge. If a bridge does not get a Hello BPDU after a predefined interval (Max
Age), the bridge assumes that the link to the root bridge is down. This bridge then initiates negotiations with other
bridges to reconfigure the network to re-establish a valid network topology.
10.1.3

STP Port States

STP assigns five port states (see next table) to eliminate packet looping. A bridge port is not allowed to go directly
from blocking state to forwarding state so as to eliminate transient loops.
PORT STATE
Disabled STP is disabled (default).
Blocking Only configuration and management BPDUs are received and processed.
Listening All BPDUs are received and processed.
Learning All BPDUs are received and processed. Information frames are submitted to the learning
process but not forwarded.
Forwarding All BPDUs are received and processed. All information frames are received and forwarded.

10.2 STP Status

Click Advanced Application and then Spanning Tree Protocol in the navigation panel to display the STP status
as shown in the screen next.
10-2

Table 10-2 STP Port States

DESCRIPTION
Spanning Tree Protocol