Allied-telesis AT-S63 User Manual Page 305

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AT-S63 Management Software Web Browser Interface User’s Guide
Section IV: Spanning Tree Protocols 305
Configuring
RSTP Port
Settings
To configure RSTP port parameters, perform the following procedure:
1. Perform steps 1 to 4 in “Configuring RSTP Bridge Settings” on
page 302 to display the Spanning Tree tab.
2. To configure RSTP port settings, click on the port in the switch image
and click Modify. You can select more than one port at a time.
The RSTP Settings - Port(s) page is shown in Figure 120.
Figure 120. RSTP Settings - Port(s) Page
3. Configure the following parameters as necessary.
Port Priority
This parameter is used as a tie breaker when two or more ports are
determined to have equal costs to the root bridge. The range is 0 to
240 in increments of 16. The default value is 8 (priority value 128). For
a list of the increments, refer to Table 7 on page 298.
Port Cost
The spanning tree algorithm uses the cost parameter to decide which
port provides the lowest cost path to the root bridge for that LAN. The
range is 0 to 20,000,000. The default setting is Automatic detect, which
sets port cost depending on the speed of the port. Default values are
2,000,000 for 10 Mbps ports, 200,000 for a 100 Mbps ports, and
20,000 for one gigabit ports.
Enable Migration Check
This parameter is displayed only when RSTP is enabled. This
parameter resets an RSTP port, allowing it to send RSTP BPDUs.
When an RSTP bridge receives STP BPDUs on an RSTP port, the port
transmits STP BPDUs. The RSTP port continues to transmit STP
BPDUs indefinitely. Type C to reset the MSTP port to transmit RSTP
BPDUs.
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