ZyXEL Communications XS-3900-48F User Manual Download

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Chapter 11 Spanning Tree Protocol

XS3900-48F User’s Guide

114

11.5 Rapid Spanning Tree Protocol Status

Click Advanced Application > Spanning Tree Protocol in the navigation panel to display the
status screen as shown next. See

Section 11.1 on page 107

for more information on RSTP.

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:

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

Port

This field displays the port number.

Settings in this row apply to all ports.

Use this row only if you want to make some settings the same for all ports. Use this row
first to set the common settings and then make adjustments on a port-by-port basis.

Note: Changes in this row are copied to all the ports as soon as you make them.

Active

Select this check box to activate RSTP on this port.

Edge

Select this check box to configure a port as an edge port when it is directly attached to a
computer. An edge port changes its initial STP port state from blocking state to forwarding
state immediately without going through listening and learning states right after the port
is configured as an edge port or when its link status changes.

Note: An edge port becomes a non-edge port as soon as it receives a Bridge Protocol Data

Unit (BPDU).

Priority

Configure the priority for each port here.

Priority decides which port should be disabled when more than one port forms a loop in a
switch. Ports with a higher priority numeric value are disabled first. The allowed range is
between 0 and 255 and the default value is 128.

Path Cost

Path cost is the cost of transmitting a frame on to a LAN through that port. It is
recommended to assign this value according to the speed of the bridge. The slower the
media, the higher the cost - see

Table 31 on page 107

for more information.

Apply

Click Apply to save your changes to the Switch’s run-time memory. The Switch loses
these changes if it is turned off or loses power, so use the Save link on the top navigation
panel to save your changes to the non-volatile memory when you are done configuring.

ZyXEL Communications XS-3900-48F, User Manual

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