Alcatel-Lucent OmniSwitch 6250, Cli Reference Manual, Page: 465 / 2018

Distributed Spanning Tree Commands
OmniSwitch 6250 CLI Reference Guide November 2009 page 16-25
bridge msti priority
Configures the bridge priority value for an Multiple Spanning Tree Instance (MSTI). Bridge priority is
used to determine which bridge the Spanning Tree algorithm designates as the root bridge.
bridge msti msti_id priority priority
Syntax Definitions
msti_id An existing MSTI ID number (0–4094).
priority A bridge priority value that is a multiple of 4096 and within the range of
0–65535. Do not use commas in the value.
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 bridge priority value for an MSTI is calculated by adding the configured priority value to the
Spanning Tree instance number. For example, if the priority value of MSTI 10 equals 32768 (the
default), then the Spanning Tree priority value advertised for this instance is 32770 (32768 + 10).
•
The lower the bridge priority number, the higher the priority that is associated with the bridge.
•
This command is an explicit Spanning Tree command that only applies to the specified MSTI regard-
less of which operating mode (flat or 1x1) is active on the switch. If MSTP is not the selected flat
mode protocol, however, the priority value for any MSTI is not configurable in either mode.
•
Note that if zero is entered for the msti_id value, the specified priority value is applied to the CIST
instance. The flat mode CIST instance 0 is also known as MSTI 0.
•
If the switch is running in 1x1 mode when this command is used, the specified priority value is not
active for the specified MSTI until the operating mode for the switch is changed to the flat mode.
•
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.
•
In regards to the priority for an MSTI, only the four most significant bits are used.