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Chapter 45 Spanning Tree Protocol
XMG1915 Series User’s Guide
247
The following table describes the labels in this screen.
45.4 Rapid Spanning Tree Protocol Status
The Spanning Tree Protocol status screen changes depending on what standard you choose to
implement on your network. Click SWITCHING > Spanning Tree Protocol > Spanning Tree Protocol Status
in the navigation panel to display the status screen as shown next. See Section 45.1 on page 242 for
more information on RSTP.
Note: This screen is only available after you activate RSTP on the Switch.
Table 132 SWITCHING > Spanning Tree Protocol > Spanning Tree Setup
LABEL DESCRIPTION
Spanning Tree
Mode
You can activate one of the STP modes on the Switch.
Select Rapid Spanning Tree or Multiple Spanning Tree.
Auto Path-cost Mode
Auto Path-cost Mode allows you to have the Switch automatically set the path cost for each port according to
their link speed. The Switch uses the path costs to determine the best path to the root bridge in a spanning tree.
There are three Auto Path-cost Modes that supports different path cost lengths:
• Short (16-bit)
• Long (32-bit)
• User-defined (32-bit).
The auto path cost values of each mode are described in Section 45.3 on page 245.
Note: It is recommended to use the same Auto Path-cost Mode on all switches within the spanning
tree network system.
To use the auto path-cost feature, select the Auto Path-cost mode (Short, Long, User-defined), set a port’s Path Cost
(in the SWITCHING > Spanning Tree Protocol > RSTP and MSTP screens) to “0”. The Switch will automatically set the
port’s path cost to the auto path cost value defined by the Auto Path-cost Mode you select.
Short Select this mode if you want to use the 16-bit auto path cost values the Switch defines.
Long Select this mode if you want to use the 32-bit auto path cost values the Switch defines.
User-defined Select this mode to manually set the auto path costs for each link speed. Enter the path cost
value for each link speed. The range is from 1 – 2000000. It is recommended to assign this value
according to link speeds. The slower the speed, the higher the cost.
Apply Click Apply to save your changes to the Switch’s run-time memory. The Switch loses these
changes if it is turned off or loses power, so use the Save link on the top navigation panel to
save your changes to the non-volatile memory when you are done configuring.
Cancel Click Cancel to begin configuring this screen afresh.
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