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New Member

STP and port-priority use

hallo

STP use the cumulative port-cost to build the loop-free tree.

In a STP switch if two ports has the same cost, the switch choses the port whith the lowes ID (es. between F0/1 and F0/2 it chooses F0/1) but if I change the priority of the port so that F0/1 has a priority value > 128 (the default value), the switch always chooses the F0/1 over F0/2 as root-port.

What is the port-priority used for in STP ?

best regards

francesco

1 REPLY
New Member

Re: STP and port-priority use

Hello,

Port priority is mainly used for load balancing purpose when you have two switches interconnected together via two or more links.

You should read this page for more information :

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800ae96a.shtml

Regards,

Christophe

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