Stp Port States; Table 27 Stp Port States - ZyXEL Communications Internet Security Appliance ZyWALL5UTM 4.0 User Manual

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
Disabled
Blocking
Listening
Learning
Forwarding
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.
Chapter 6 Bridge Screens
DESCRIPTION
STP is disabled (default).
Only configuration and management BPDUs are received and processed.
All BPDUs are received and processed.
All BPDUs are received and processed. Information frames are submitted to the
learning process but not forwarded.
All BPDUs are received and processed. All information frames are received and
forwarded.
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