Disadvantages of running loopguard globally?

[johnnylingo]

Is there any disadvantage of running loopguard globally with this command?

spanning-tree loopguard default

I've heard it should only be used on root and alternate ports.

[padramas]

Hello John,

Placement of global command is also related to the role of the bridge. The following link discusses the interaction of loop guard with other STP enhancements

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080094640.shtml

HTH

Padmanabhan