Allied Telesis AT-S63 - Manual (Page 548)

Chapter 23: Spanning Tree and Rapid Spanning Tree Protocols
548 Section V: Spanning Tree Protocols
8. Adjust the following parameters as necessary.
1 - 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 16, “Port Priority Value
Increments” on page 529.
2 - 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 Update,
which sets port cost depending on the speed of the port. The
Automatic Update default values are shown in Table 14 on page 529
and Table 15 on page 529.
3 - Point-to-Point
This parameter defines whether the port is functioning as a point-to-
point port. The possible settings are Yes, No, and Auto Detect. For an
explanation of this parameter, refer to “Point-to-Point and Edge Ports”
on page 531.
4 - Edge Port
This parameter defines whether the port is functioning as an edge port.
The possible settings are Yes and No. For an explanation of this
parameter, refer to “Point-to-Point and Edge Ports” on page 531.
C - Check Migration To RSTP on Selected Ports (MCHECK)
The MCHECK 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.
9. After making changes, type R until you return to the Main Menu. Then
type S to select Save Configuration Changes.
Displaying the
RSTP Port
Configuration
To display the RSTP port configuration, perform the following procedure:
1. From the Main Menu, type 3 to select Spanning Tree Configuration.
The Spanning Tree Configuration menu is shown in Figure 177 on
page 535.
2. From the Spanning Tree Configuration menu, type 3 to select
Configure Active Protocol.
The RSTP menu is shown in Figure 178 on page 537.