Zyxel VES-1616FE-55A [163/318] Rstp config screen

Chapter 23 Rapid Spanning Tree Protocol

VES-1616FE-55A User’s Guide

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23.3 RSTP Config Screen

To open this screen, click Advanced Application > RSTP > RSTP Config.

Figure 93 RSTP Config

The following table describes the labels in this screen.

Table 55 RSTP Config

LABEL DESCRIPTION

Active Select this check box to turn on RSTP.

Bridge Priority Bridge priority is used in determining the root switch, root port and designated

port. The switch with the highest priority (lowest numeric value) becomes the

STP root switch. If all switches have the same priority, the switch with the lowest

MAC address will then become the root switch. The allowed range is 0 to

61440.

The lower the numeric value you assign, the higher the priority for this bridge.

Bridge Priority determines the root bridge, which in turn determines Hello Time,

Max Age and Forwarding Delay.

Hello Time This is the time interval in seconds between BPDU (Bridge Protocol Data Units)

configuration message generations by the root switch. The allowed range is 1 to

10 seconds.

MAX Age This is the maximum time (in seconds) a switch can wait without receiving a

BPDU before attempting to reconfigure. All switch ports (except for designated

ports) should receive BPDUs at regular intervals. Any port that ages out STP

information (provided in the last BPDU) becomes the designated port for the

attached LAN. If it is a root port, a new root port is selected from among the

switch ports attached to the network. The allowed range is 6 to 40 seconds.

Forwarding Delay This is the maximum time (in seconds) a switch will wait before changing states.

This delay is required because every switch must receive information about

topology changes before it starts to forward frames. In addition, each port needs

time to listen for conflicting information that would make it return to a blocking

state; otherwise, temporary data loops might result. The allowed range is 4 to 30

seconds.

As a general rule:

2 * (Forward Delay - 1) >= Max Age >= 2 * (Hello Time + 1)

Port This field identifies the Ethernet port.

Active Select this check box to activate STP on this port.