Zyxel-communications 5 Series Instrukcja Użytkownika Pobierz pdf (Strona 143)

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ZyWALL 5/35/70 Series User’s Guide

Chapter 7 Bridge Screens 143

STP-aware bridges exchange Bridge Protocol Data Units (BPDUs) periodically. When the

bridged LAN topology changes, a new spanning tree is constructed.

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.

7.2.4 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.

7.3 Bridge

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

ZyWALL function as a bridge.

In bridge mode, the ZyWALL functions as a transparent firewall (also known as a bridge

firewall). The ZyWALL bridges traffic traveling between the ZyWALL's interfaces and still

filters and inspects packets. You do not need to change the configuration of your existing

network.

You can use the firewall and VPN in bridge mode.Click NETWORK > BRIDGE to display

the screen shown next. Use this screen to configure bridge and RSTP (Rapid Spanning Tree

Protocol) settings.

Table 28 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.

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