ISON IS-RG528 Series, Web Configuration Tool Manual

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2.3.8.4 MSTP Port
Operation Modify:
1. Select a row item to selected
2. Set or select the following fields.
3. Click "Modify" button.
Field Description
Port Range: GE-1 ~ MAX Number of Port
Priority Range: 0~240 in step 16, Default is default=0x80(128).
Path Cost Range: 1 ~ 200000000, Default is 20000.
Role Range: Disabled/ Root/ Designated/ Alternate/ Backup/ Master/ Unknown.
State
Range : Disabled/ Blocking/ Listening/ Learning/ Forwarding/ Broken
Disabled : For ports which are disabled (see dot1dStpPortEnable), this object will have
a value of disabled.
Blocking : The port will go into a blocking state at the time of selection process, when a
switch receives a BPDU on a port that indicates a better path to the root switch, and if
a port is not a root port or a designated port.
Listening : After blocking state, a root port or a designated port will move to a listening
state. All other ports will remain in a blocked state. During the listening state the port
discards frames received from the attached network segment and it also discards
frames switched from another port for forwarding. At this state, the port receives
BPDUs from the network segment and directs them to the switch system module for
processing. After a forward time delay (The default forward delay time is 15 seconds.),
the switch port moves from the listening state to the learning state.
Learning : A port changes to learning state after listening state. During the learning
state, the port is listening for and processing BPDUs. In the listening state, the port