ZyXEL GS1500-24P User Guide - Page 73
Spanning Tree Protocol
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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. GS1500-24P User's Guide 73