Alcatel-Lucent OmniSwitch 6250, Cli Reference Manual, Page: 518 / 2018

Distributed Spanning Tree Commands
page 16-78 OmniSwitch 6250 CLI Reference Guide November 2009
bridge 1x1 slot/port path cost
Configures the Spanning Tree path cost value for a port or an aggregate of ports for the specified 1x1
mode VLAN instance. This value is the contribution of this port to the path cost towards the Spanning
Tree root bridge that includes this port. Path cost is a measure of the distance of the listed port from the
root bridge in the number of hops.
bridge 1x1 vid {slot/port | logical_port} path cost path_cost
Syntax Definitions
vid An existing VLAN ID number (1–4094).
slot/port Enter the slot number for the module and the physical port number on
that module (e.g., 3/1 specifies port 1 on slot 3).
logical_port Link aggregate ID number (0–31).
path_cost Path cost value (0 - 65535 for 16-bit, 0–200000000 for 32-bit).
Defaults
By default, the path cost is set to zero.
Platforms Supported
OmniSwitch 6250
Usage Guidelines
•
This command is an explicit Spanning Tree command that only applies to the specified VLAN instance
regardless of which operating mode (flat or 1x1) is active on the switch.
•
If the switch is running in the flat mode when this command is used, the specified path cost for the port
is not active for the specified VLAN instance until the operating mode for the switch is changed to the
1x1 mode.
•
Note that when the Spanning Tree protocol is changed to/from MSTP, the bridge priority and port path
cost values for the flat mode CIST instance are reset to their default values.
•
Use the bridge path cost mode command to automatically select the path cost value based on the
active Spanning Tree protocol (16-bit for STP and RSTP, 32-bit for MSTP) or to use a 32-bit path cost
value regardless of which protocol is active.
•
Note that when a configuration snapshot is taken of the switch, all Spanning Tree commands are saved
in their explicit format.
•
If a 32-bit path cost value is in use and the path_cost is set to zero, the following IEEE 892.1S recom-
mended default path cost values based on link speed are used: