D-Link DES-2108/E [47/199] Illustration of sta

24-port NWay Ethernet Switch User’s Guide

Switch Management 33

Hello Time will be used if and when your Switch becomes the

Root Bridge.

Note: The Hello Time cannot be longer than the Max. Age.

Otherwise, a configuration error will occur.

♦ 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.

♦ Bridge Forward Delay 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.

Observe the following formulas when you set the above

parameters:

1. Max. Age ≤ 2 x (Forward Delay - 1 second)

2. Max. Age ≥ 2 x (Hello Time + 1 second)

♦ Port Priority A Port Priority can be from 0 to 255. The

lower the number, the greater the probability the port will

be chosen as the Root Port.

Illustration of STA

A simple illustration of three Bridges (or the Switch) connected in a

loop is depicted in Figure 5-1. In this example, you can anticipate

some major network problems if the STA assistance is not applied.

For instance, if Bridge 1 broadcasts a packet to Bridge 2, Bridge 2

will broadcast it to Bridge 3, and Bridge 3 will broadcast it to

Bridge 1...and so on. The broadcast packet will be passed

indefinitely in a loop, causing a serious network failure.

Удалено: Using the Console

Interface