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Menus Reference Manual: LAN Bridge-STP Set-Up Menu
2 - Path Cost
The Path Cost option allows the setting of the contributing path cost to the Root for this port.
Contribution of Path Cost to Root Path Cost:
The path cost to the Root Bridge is added to those path costs of other bridges along the same stream to the Root
Bridge. The result is the Root Path Cost.
Once the Root Bridge is selected, a determination of which bridge(s) will become blocked where necessary is made.
This determination is made by comparing the sum of the path costs (i.e. the Root Path Cost) to the Root Bridge. Where
redundant paths exist, the bridge with the lowest Root Path Cost to the Root Bridge will become the Designated Bridge for
the LAN. If all contending bridges' ports have the same Root Path Costs, then first their Bridge IDs (Priority/MAC
address) and second their Port IDs (Port Priority) will be used as tiebreakers.
Default:
[100]
Range:
1 to 65535
Considerations:
Increasing this value increases the total cost of the path to the Root Bridge. This may (depending on the
topology) cause a bridge along the path to the Root bridge to be taken out of service and a blocked bridge to
come into service.
Decreasing the value may have the opposite effect.
3 - Priority
The Priority option allows the setting of the port priority. This value is entered in decimal format and appears in hex
format in the Port ID/Designated Port identifier (as applicable) of the Port Status display.
Default:
[128] (decimal)
Range:
0 - 255
Considerations:
Increasing this value lowers the probability of this port becoming the Root port to the Root bridge.
Decreasing this value increases the probability.
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