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Designated Bridge
attached Bridge that has the lowest Root Path Cost to
the Root Bridge is the Designated Bridge. It forwards
data packets for that LAN segment. In cases where all
Switches have the same Root Path Cost, the switch
with the lowest Bridge Identifier becomes the
Designated Bridge.
Root Path Cost The Root Path Cost of a switch is the
sum of the Path Cost of the Root Port and the Root
Path Costs of all the switches that the packet goes
through. The Root Path Cost of the Root Bridge is
zero.
Bridge Priority This is a parameter that users can
set. The smaller the number you set, the higher the
Bridge Priority is. The higher the Bridge Priority, the
better the chance the Switch will be selected as the
Root Bridge.
On the Port Level
Root Port Each switch has a Root Port. This is the
port that has the lowest Path Cost to the Root Bridge.
In case there are several such ports, then the one with
the lowest Port Identifier is the Root Port.
Designated Port This is the port on each Designated
Bridge that is attached to the LAN segment for which
the switch is the Designated Bridge.
Port Priority The smaller this number, the higher
the Port Priority is. With higher Port Priority, the
higher the probability that the port will be selected as
the Root Port.
Switch Management
Gigabit Ethernet Switch User's Guide
From each LAN segment, the
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