HP ProCurve 7102dl Reference Manual page 786

SROS Command Line Interface Reference Guide
spanning-tree path-cost <value>
Use the spanning-tree path-cost command to assign a cost to a bridge group that is used when computing
the spanning-tree root path. To return to the default path-cost value, use the no form of this command.
Syntax Description
<value>
Default Values
By default, the path-cost value is set to 19.
Functional Notes
The specified value is inversely proportional to the likelihood the bridge interface will be chosen as the root
path. Set the path-cost value lower to increase the chance the interface will be the root. To obtain the most
accurate spanning tree calculations, develop a system for determining path costs for links and apply it to
all bridged interfaces.
Usage Examples
The following example assigns a path cost of 100 for bridge group 17 on an ATM sub-interface:
ProCurve(config)#interface atm 1.1
ProCurve(config-atm 1.1)#spanning-tree path-cost 100
Technology Review
Spanning-tree protocol provides a way to prevent loopback or parallel paths in bridged networks. Using the
priority values and path costs assigned to each bridging interface, the spanning-tree protocol determines
the root path and identifies whether to block or allow other paths.
5991-2114
Assigns a number to the bridge interface to be used as the path cost in spanning
calculations (valid range: 0 to 65,535).
© Copyright 2006 Hewlett-Packard Development Company, L.P.
ATM Sub-Interface Config Command Set
784