Bridge Path Cost Mode - Alcatel-Lucent OmniSwitch 6250 Cli Reference Manual

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Distributed Spanning Tree Commands

bridge path cost mode

Configures the automatic selection of a 16-bit path cost for STP/RSTP ports and a 32-bit path cost for

MSTP ports or sets all path costs to use a 32-bit value.

bridge path cost mode {auto | 32bit}

Syntax Definitions

By default, the path cost mode is set to auto.

Platforms Supported

OmniSwitch 6250

Usage Guidelines

Note that all path cost values, except those for MSTIs, are reset to the default path cost value when this

mode is changed.

When connecting a switch running in the 32-bit path cost mode to a switch running in the 16-bit mode,

the 32-bit switch will have a higher path cost value and thus an inferior path cost to the 16-bit switch.

To avoid this, use the bridge path cost mode command to change the 32-bit switch to a 16-bit switch.

Note that when the 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. The exception to this is if the path cost

mode is set to 32-bit prior to the protocol change, the path cost is not reset to its default value

-> bridge path cost mode 32bit

-> bridge path cost mode auto

Release History

Release 6.6.1; command was introduced.

Related Commands

bridge slot/port path cost

bridge protocol

OmniSwitch 6250 CLI Reference Guide

The port path cost value is automatically set depending on which proto-

col is active on the switch (32-bit for MSTP, 16-bit for STP/RSTP).

Specifies that a 32-bit value is used for the port path cost value regard-

less of which protocol is active on the switch.

Defines a Spanning Tree path cost for a port.

Configures the protocol for the flat mode CIST instance or a 1x1 mode

VLAN instance.

November 2009