Zyxel-communications Internet Security Appliance ZyWALL5UTM 4.0 Manual de usuario descargar pdf (Pagina 120)

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ZyWALL 5/35/70 Series User’s Guide

Chapter 6 Bridge Screens 120

Once a stable network topology has been established, all bridges listen for Hello BPDUs

(Bridge Protocol Data Units) transmitted from the root bridge. If a bridge does not get a Hello

BPDU after a predefined interval (Max Age), the bridge assumes that the link to the root

bridge is down. This bridge then initiates negotiations with other bridges to reconfigure the

network to re-establish a valid network topology.

6.2.4 STP Port States

STP assigns five port states (see next table) to eliminate packet looping. A bridge port is not

allowed to go directly from blocking state to forwarding state so as to eliminate transient

loops.

Table 27 STP Port States

PORT STATE DESCRIPTION

Disabled STP is disabled (default).

Blocking Only configuration and management BPDUs are received and processed.

Listening All BPDUs are received and processed.

Learning All BPDUs are received and processed. Information frames are submitted to the

learning process but not forwarded.

Forwarding All BPDUs are received and processed. All information frames are received and

forwarded.

6.3 Bridge

Select Bridge and click Apply in the MAINTENANCE Device Mode screen to have the

ZyWALL function as a bridge.

Click NETWORK, BRIDGE to display the screen shown next. Use this screen to configure

bridge and RSTP (Rapid Spanning Tree Protocol) settings.

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