Planet WGSW-2840 Инструкция по эксплуатации онлайн [37/104] 65303

elected as the root port

Port Cost

A value used by STP to evaluate paths –

STP calculates path costs and selects the

path with the minimum cost as the active

path

19-100Mbps Fast Ethernet ports

4-1000Mbps Gigabit Ethernet ports

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.

NOTICE: The Hello Time cannot be longer than the Max. Age. Otherwise, a configuration error will

occur.

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.

NOTICE: 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)