Distributed Spanning Tree Commands
OmniSwitch 6250 CLI Reference Guide November 2009 page 16-21
bridge priority
Configures the bridge priority value for the flat mode Common and Internal Spanning Tree (CIST)
instance or for a 1x1 mode VLAN instance. Bridge priority is used to determine which bridge the Span-
ning Tree algorithm designates as the root bridge.
bridge [instance] priority priority
Syntax Definitions
instance The flat mode CIST instance or an existing VLAN ID number (1–4094).
priority A bridge priority value within the range of 0–65535. Do not use
commas in the value. If MSTP is the active protocol on the switch, then
a bridge priority value that is a multiple of 4096 is required.
Defaults
By default, the bridge priority value is set to 32768.
Platforms Supported
OmniSwitch 6250
Usage Guidelines
• The bridge priority specifies the priority value for the first two octets of the Bridge ID (eight octets
long). The remaining six octets of the Bridge ID contain a dedicated bridge MAC address.
• The lower the bridge priority number, the higher the priority that is associated with the bridge.
• Specifying an instance number with this command when the switch is running in the 1x1 Spanning
Tree mode implies a VLAN ID and configures the priority value for the associated VLAN instance.
• To configure the priority value for the flat mode CIST instance when the switch is running in either the
flat or 1x1 mode, do not specify an instance number. The CIST is the instance configured by default
with this command.
• If the switch is running in the flat mode and STP or RSTP is the active protocol, entering 1 to specify
the CIST instance is optional. If MSTP is the active protocol, however, entering 1 for the instance
number is not accepted. In this case, use the bridge cist priority or bridge msti priority commands
instead.
• Note that when the protocol is changed to/from MSTP, the bridge priority for the flat mode CIST
instance is reset to the default value.
parameter default
instance flat mode instance
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