User manual ZYXEL GS1500-24P

[. . . ] GS1500-24P Web Managed GbE Switch Default Login Details IP Address User Name Password http://192. 168. 1. 1 admin 1234 Firmware Version 1. 00 Edition 1, 8/2009 www. zyxel. com Copyright © 2009 ZyXEL Communications Corporation About This User's Guide About This User's Guide Intended Audience This manual is intended for people who want to configure the Switch using the web configurator. Related Documentation · Support Disc Refer to the included CD for support documents. Documentation Feedback Send your comments, questions or suggestions to: techwriters@zyxel. com. tw Thank you!The Technical Writing Team, ZyXEL Communications Corp. , 6 Innovation Road II, Science-Based Industrial Park, Hsinchu, 30099, Taiwan. Need More Help? More help is available at www. zyxel. com. · Download Library Search for the latest product updates and documentation from this link. Read the Tech Doc Overview to find out how to efficiently use the User Guide and Quick Start Guide in order to better understand how to use your product. · Knowledge Base If you have a specific question about your product, the answer may be here. [. . . ] This field displays the port's port VLAN ID (PVID). 72 GS1500-24P User's Guide CHAPTER 9. 1 Overview 9 Spanning Tree Protocol 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 Chapter 9 Spanning Tree Protocol 9. 3. 1 STP Terminology The root bridge is the base of the spanning tree. Path cost is the cost of transmitting a frame onto a LAN through that port. The recommended cost is assigned according to the speed of the link to which a port is attached. On each bridge, the root port is the port through which this bridge communicates with the root. It is the port on this switch with the lowest path cost to the root (the root path cost). If there is no root port, then this switch has been accepted as the root bridge of the spanning tree network. This bridge has the lowest cost to the root among the bridges connected to the LAN. 9. 3. 2 How STP Works After a bridge determines the lowest cost-spanning tree with STP, it enables the root port and the ports that are the designated ports for connected LANs, and disables all other ports that participate in STP. Network packets are therefore only forwarded between enabled ports, eliminating any possible network loops. STP-aware switches 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. 9. 3. 3 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. Table 16 STP Port States PORT STATE Disabled Blocking DESCRIPTION STP is disabled (default). Only configuration and management BPDUs are received and processed. 74 GS1500-24P User's Guide Chapter 9 Spanning Tree Protocol Table 16 STP Port States PORT STATE Listening DESCRIPTION All BPDUs are received and processed. Note: The listening state does not exist in RSTP. Learning Forwarding All BPDUs are received and processed. [. . . ] Trivial File Transfer Protocol is an Internet file transfer protocol similar to FTP, but uses the UDP (User Datagram Protocol) rather than TCP (Transmission Control Protocol). Another videoconferencing solution. TFTP UDP 69 VDOLIVE TCP 7000 174 GS1500-24P User's Guide APPENDIX Copyright Copyright © 2009 by ZyXEL Communications Corporation. C Legal Information The contents of this publication may not be reproduced in any part or as a whole, transcribed, stored in a retrieval system, translated into any language, or transmitted in any form or by any means, electronic, mechanical, magnetic, optical, chemical, photocopying, manual, or otherwise, without the prior written permission of ZyXEL Communications Corporation. All rights reserved. Disclaimer ZyXEL does not assume any liability arising out of the application or use of any products, or software described herein. Neither does it convey any license under its patent rights nor the patent rights of others. [. . . ]