User manual ZYXEL GS-3012F

[. . . ] Dimension GS-3012F Gigabit Ethernet Switch Version 3. 60 (LR. 0) 5/2005 User's Guide GS-3012F User's Guide Copyright Copyright © 2004 by ZyXEL Communications Corporation 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 patents rights of others. ZyXEL further reserves the right to make changes in any products described herein without notice. [. . . ] You may temporarily deactivate a rule without deleting it by deselecting this check box. This is for identification purpose only. Filtering 9-1 GS-3012F User's Guide Table 9-1 Filtering LABEL Action DESCRIPTION Select Discard source to drop frame from the source MAC address (specified in the MAC field). Select Discard destination to drop frames to the destination MAC address (specified in the MAC address). Select Discard source and Discard destination to block traffic to/from the MAC address specified in the MAC field. MAC VID Add Cancel Clear Type a MAC address in valid MAC address format, that is, six hexadecimal character pairs. Click Clear to clear the fields to the factory defaults. 9. 3 Viewing and Editing Filter Rules To view a summary of the rule configuration, scroll down to the summary table at the bottom of the Filtering screen. To change the settings of a rule, click a number in the Index field. Figure 9-2 Filtering: Summary Table The following table describes the labels in the summary table. Table 9-2 Filtering: Summary Table LABEL Index Active Name MAC Address DESCRIPTION This field displays the index number of the rule. This field displays Yes when the rule is activated and No when is it deactivated. This field displays the source/destination MAC address with the VLAN identification number to which the MAC address belongs. 9-2 Filtering GS-3012F User's Guide Table 9-2 Filtering: Summary Table LABEL Action Delete Cancel This field displays the filter action. Check the rule(s) that you want to remove in the Delete column and then click the Delete button. DESCRIPTION Filtering 9-3 GS-3012F User's Guide Chapter 10 Spanning Tree Protocol This chapter introduces the Spanning Tree Protocol (STP). 10. 1 Introduction to Spanning Tree Protocol (STP) STP detects and breaks network loops and provides backup links between switches, bridges or routers. It allows a switch to interact with other STP-compliant switches in your network to ensure that only one route exists between any two stations on the network. 10. 1. 1 STP Terminology The root bridge is the base of the spanning tree; it is the bridge with the lowest identifier value (MAC address). Path cost is the cost of transmitting a frame onto a LAN through that port. It is assigned according to the speed of the link to which a port is attached. Table 10-1 STP Path Costs LINK SPEED Path Cost Path Cost Path Cost Path Cost Path Cost Path Cost 4Mbps 10Mbps 16Mbps 100Mbps 1Gbps 10Gbps RECOMMENDED VALUE 250 100 62 19 4 2 RECOMMENDED RANGE 100 to 1000 50 to 600 40 to 400 10 to 60 3 to 10 1 to 5 ALLOWED RANGE 1 to 65535 1 to 65535 1 to 65535 1 to 65535 1 to 65535 1 to 65535 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. 10. 1. 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. [. . . ] 17-2 Configuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-3 Trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-4 Get . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-2 Manager. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]