Bridge Slot/Port Path Cost - Alcatel-Lucent OmniSwitch 6250 Cli Reference Manual

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Distributed Spanning Tree Commands

bridge slot/port path cost

Configures the Spanning Tree path cost value for a single port or an aggregate of ports that applies to the

specified flat mode Common and Internal Spanning Tree (CIST) instance or a 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 instance {slot/port | logical_port} path cost path_cost

Syntax Definitions

logical_port

By default, the path cost is set to zero.

Platforms Supported

OmniSwitch 6250

Usage Guidelines

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 port path cost for the associated VLAN instance.

If the switch is running in the flat mode and STP (802.1D) or RSTP (802.1W) is the active protocol,

enter 1 to specify the CIST instance. If MSTP is the active protocol, however, entering 1 for the

instance number is not accepted. In this case, use the

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.

bridge path cost mode

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.

If a 32-bit path cost value is in use and the path_cost is set to zero, the following recommended default

path cost values based on link speed are used.

OmniSwitch 6250 CLI Reference Guide

The flat mode CIST instance or an existing VLAN ID number (1–4094).

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).

Link aggregate ID number (0–31).

Path cost value (0 - 65535 for 16-bit, 0–200000000 for 32-bit).

bridge cist slot/port path cost

command to automatically select the path cost value based on the

November 2009

command instead.