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10/100 Fast Ethernet Switch User’s Guide
Switch Management
27
♦
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.
♦
Path Cost
: This is a changeable parameter and may be modified
according to the STA specification. The 100Mbps segment has an
assigned Path Cost of 10, and each 10Mbps segment has an assigned
Path Cost of 100, based on the STA specifications.
User-Changeable Parameters
The factory default setting should cover the majority of installations.
However, it is advisable to keep the default settings as set at the factory;
unless, it is absolutely necessary. The user changeable parameters in the
Switch are as follows: