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The following are the user-configurable STP parameters for the port or port group level:
Variable
Port Priority
Port Cost
Default Spanning-Tree Configuration
User-Changeable STA Parameters
The Switch's 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:
Priority – A Priority for the switch can be set from 0 to 65535. 0 is equal to the highest Priority.
Hello Time – The Hello Time can be from 1 to 10 seconds. This is the interval between two transmissions of BPDU packets sent
by the Root Bridge to tell all other Switches that it is indeed the Root Bridge. If you set a Hello Time for your Switch, and it is not
the Root Bridge, the set Hello Time will be used if and when your Switch becomes the Root Bridge.
Max. Age – The Max Age can be from 6 to 40 seconds. At the end of the Max Age, if a BPDU has still not been received from
the Root Bridge, your Switch will start sending its own BPDU to all other Switches for permission to become the Root Bridge. If it
turns out that your Switch has the lowest Bridge Identifier, it will become the Root Bridge.
Forward Delay Timer – The Forward Delay can be from 4 to 30 seconds. This is the time any port on the
Switch spends in the listening state while moving from the blocking state to the forwarding state.
Description
A relative priority for each
port –lower numbers give a higher priority
and a greater chance of a given port being
elected as the root port
A value used by STP to evaluate paths –
STP calculates path costs and selects the
path with the minimum cost as the active
path
Feature
Enable state
Port priority
Port cost
Bridge Priority
The Hello Time cannot be longer than the Max. Age. Otherwise, a configuration error will
occur.
Observe the following formulas when setting the above parameters:
Max. Age _ 2 x (Forward Delay - 1 second)
Max. Age _ 2 x (Hello Time + 1 second)
User's Manual of WGS Managed Series
Default Value
128
200,000-100Mbps Fast Ethernet ports
20,000-1000Mbps Gigabit Ethernet
ports
0 - Auto
Default Value
STP disabled for all ports
128
0
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