User’s Manual of WGSD-1022/WGSD-8000

 

chance of a given switch being elected as

 

 

the root bridge

 

 

 

 

Hello Time

The length of time between broadcasts of

2 seconds

 

the hello message by the switch

 

 

 

 

Maximum Age Timer

Measures the age of a received BPDU for a

20 seconds

 

port and ensures that the BPDU is discarded

 

 

when its age exceeds the value of the

 

 

maximum age timer.

 

 

 

 

Forward Delay Timer

The amount time spent by a port in the

15 seconds

 

learning and listening states waiting for a

 

 

BPDU that may return the port to the

 

 

blocking state.

 

 

 

 

The following are the user-configurable STP parameters for the port or port group level:

Variable

Description

 

Default Value

Port Priority

A relative priority for each

 

32768

 

 

port –lower numbers give a higher priority

 

 

 

 

and a greater chance of a given port being

 

 

 

 

elected as the root port

 

 

 

 

 

 

 

 

 

 

Port Cost

A value used by STP to evaluate paths –

 

19-100Mbps Fast Ethernet ports

 

STP calculates path costs and selects the

 

4-1000Mbps Gigabit Ethernet ports

 

path with the minimum cost as the active

 

 

 

 

path

 

 

 

 

 

 

 

 

 

 

Default Spanning-Tree Configuration

 

 

 

 

 

 

 

 

 

 

 

Feature

 

Default Value

 

 

 

Enable state

 

STP enabled for all ports

 

 

 

 

 

 

 

 

 

Port priority

 

128

 

 

 

 

 

 

 

 

 

 

Port cost

 

19

 

 

 

 

 

 

 

 

 

 

Bridge Priority

 

32,768

 

 

 

 

 

 

 

 

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.

- 103 –