Инструкция для ZYXEL GS1920-48

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Chapter 13 Spanning Tree Protocol

GS1920 Series User’s Guide

114

STP Port States

STP assigns five port states 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.

Multiple RSTP

MRSTP (Multiple RSTP) is ZyXEL’s proprietary feature that is compatible with RSTP and STP. With
MRSTP, you can have more than one spanning tree on your Switch and assign port(s) to each tree.
Each spanning tree operates independently with its own bridge information.

In the following example, there are two RSTP instances (MRSTP 1 and MRSTP2) on switch A.

To set up MRSTP, activate MRSTP on the Switch and specify which port(s) belong to which spanning
tree.

Note:

Each port can belong to one STP tree only.

Figure 87

MRSTP Network Example

Multiple STP

Multiple Spanning Tree Protocol (IEEE 802.1s) is backward compatible with STP/RSTP and
addresses the limitations of existing spanning tree protocols (STP and RSTP) in networks to include
the following features:

Table 43

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.

Note: The listening state does not exist in RSTP.

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