Brocade 6910 Ethernet Access Switch Configuration Guide (Supporting R2.2.0.0) - Manual (Page 394)

338 Brocade 6910 Ethernet Access Switch Configuration Guide
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Spanning Tree Commands
priority - Priority of the a spanning tree instance.
(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
MST Configuration
Command Usage
• MST priority is used in selecting the root bridge and alternate bridge of the specified instance.
The device with the highest priority (i.e., lowest numerical value) becomes the MSTI root
device. However, if all devices have the same priority, the device with the lowest MAC address
will then become the root device.
• You can set this switch to act as the MSTI root device by specifying a priority of 0, or as the
MSTI alternate device by specifying a priority of 16384.
Example
Console(config-mstp)#mst 1 priority 4096
Console(config-mstp)#
mst vlan
This command adds VLANs to a spanning tree instance. Use the no form to remove the specified
VLANs. Using the no form without any VLAN parameters to remove all VLANs.
Syntax
[no] mst instance-id vlan vlan-range
instance-id - Instance identifier of the spanning tree. (Range: 0-4094)
vlan-range - Range of VLANs. (Range: 1-4093)
Default Setting
none
Command Mode
MST Configuration
Command Usage
• Use this command to group VLANs into spanning tree instances. MSTP generates a unique
spanning tree for each instance. This provides multiple pathways across the network, thereby
balancing the traffic load, preventing wide-scale disruption when a bridge node in a single
instance fails, and allowing for faster convergence of a new topology for the failed instance.