Brocade 6910 Ethernet Access Switch Configuration Guide (Supporting R2.2.0.0) - Manual (Page 391)

Brocade 6910 Ethernet Access Switch Configuration Guide 335
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Spanning Tree Commands
Command Usage
• The path cost method is used to determine the best path between devices. Therefore, lower
values should be assigned to ports attached to faster media, and higher values assigned to
ports with slower media. Note that path cost (
“spanning-tree cost” on page 342) takes
precedence over port priority ( “spanning-tree port-priority” on page 348).
• The path cost methods apply to all spanning tree modes (STP, RSTP and MSTP). Specifically,
the long method can be applied to STP since this mode is supported by a backward compatible
mode of RSTP.
Example
Console(config)#spanning-tree pathcost method long
Console(config)#
spanning-tree priority
This command configures the spanning tree priority globally for this switch. Use the no form to
restore the default.
Syntax
spanning-tree priority priority
no spanning-tree priority
priority - Priority of the bridge. (Range – 0-61440, in steps of 4096; Options: 0, 4096,
8192, 12288, 16384, 20480, 24576, 28672, 32768, 36864, 40960, 45056, 49152,
53248, 57344, 61440)
Default Setting
32768
Command Mode
Global Configuration
Command Usage
Bridge priority is used in selecting the root device, root port, and designated port. The device with
the highest priority (i.e., lower numeric value) becomes the STA root device. However, if all devices
have the same priority, the device with the lowest MAC address will then become the root device.
Example
Console(config)#spanning-tree priority 40000
Console(config)#
spanning-tree mst configuration
This command changes to Multiple Spanning Tree (MST) configuration mode.
Default Setting
No VLANs are mapped to any MST instance.
The region name is set the switch’s MAC address.
Command Mode
Global Configuration