GS1500-24P User’s Guide
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CHAPTER 9
Spanning Tree Protocol
9.1 Overview
The Switch supports Spanning Tree Protocol (STP) and Rapid Spanning Tree
Protocol (RSTP) as defined in the following standards.
• IEEE 802.1D Spanning Tree Protocol
• IEEE 802.1w Rapid Spanning Tree Protocol
9.2 What You Can Do
•Use the STP Global Setting screen (Section 9.4 on page 75) to configure global
spanning tree settings for the switch.
•Use the STP Port Setting screen (Section 9.5 on page 77) to configure individual
port spanning tree settings.
9.3 What You Need to Know
(R)STP detects and breaks network loops and provides backup links between
switches, bridges or routers. It allows a switch to interact with other (R)STP -
compliant switches in your network to ensure that only one path exists between
any two stations on the network.
The Switch uses IEEE 802.1w RSTP (Rapid Spanning Tree Protocol) that allows
faster convergence of the spanning tree than STP (while also being backwards
compatible with STP-only aware bridges). In RSTP, topology change information is
directly propagated throughout the network from the device that generates the
topology change. In STP, a longer delay is required as the device that causes a
topology change first notifies the root bridge that then notifies the network. Both
RSTP and STP flush unwanted learned addresses from the filtering database. In
RSTP, the port states are Discarding, Learning, and Forwarding.
Note: In this user’s guide, “STP” refers to both STP and RSTP.
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