METHODS AND ARRANGEMENTS FOR CONFIGURING THE L2GPS IN A FIRST STP DOMAIN CONNECTED TOWARDS A SECOND STP DOMAIN

摘要

The present invention relates to methods and arrangements for configuring the L2GPs in a first STP domain connected towards a second STP domain such that L2GPs in the first STP domain are assigned with the same Pseudo Root identity. Thus the Pseudo Root identity does not have to be changed if one of the L2GPs goes down, which implies that count-to-infinity loops may be avoided. It should be noted that only one L2GP is allowed to be open towards the second STP domain. The root path costs are assigned to the L2GPs towards the pseudo root and the value of the root path cost controls which of the L2GPs that should be open. The most preferred L2GP will be given a root path cost = 0, the second best L2GP will have a path cost which is high enough so the two ports never will be open at the same time if there is connectivity between the Ethernet switches having the L2GPs.