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the role of selection is in this Order (the rule to elect the designated Port)
1 - Cost to Root Bridge the Lowest make his port in Designated (Forwarding).
2 - If they have the same Cost than : the Bridge ID the loest make his port as Designated(Forw...
there is no need to precise IP address because the Link local ipv6 address will be generated automatically on the base of GLBP virtual mac address this Address will be propagated with RA by The GLBPs Routers
