User manual ALLIED TELESIS AT-S24 MANAGEMENT SOFTWARE VERSION 2.01

[. . . ] Management Software ® AT-S24 x User's Guide FOR USE WITH AT-8216FXL, AT-8224XL, AND AT-8288XL FAST ETHERNET SWITCH PRODUCTS VERSION 2. 01 PN 613-10809-00 Rev D Copyright 2000 Allied Telesyn International, Corp. 960 Stewart Drive Suite B, Sunnyvale, CA 94085 USA All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesyn International, Corp. CentreCom is a registered trademark of Allied Telesyn International, Corp. [. . . ] Once the maximum number has been reached on a port, any frames received on the port from a source with a new MAC addresses will be discarded. All static MAC addresses are included in the count of maximum addresses that can be learned by a port. When you select this security level, the following prompts are displayed: Figure 37 Limited Port Security Prompts Select the Config MAC address limit per port option to display a list of the ports on the switch. In the list, specify the maximum number of MAC addresses that you want each port to be able to learn. Specifying 0 (zero) means that the port will not stop learning addresses. The prompts also allow you to control how the switch will respond when a port exceeds the specified number of MAC addresses. You can instruct the switch to send an SNMP trap to the management station, disable the port, or both. 82 AT-S24 Version 2. 01 User's Guide Secure This option causes the switch to immediately stop learning new MAC addresses on all or selected ports. Any frames received on a port from a source with a new MAC address will be discarded. Existing static MAC addresses are retained and are used in determining which addresses are accepted by a port. However, you cannot add new static addresses to ports with this level of security. Activating this security level requires that you first specify the ports that are to have this level of security. The ports can be entered as a range (e. g. , 2-5) or individually (e. g. , 2, 4, 7). After specifying the ports, select the Secure level from the Port Security menu. As with the Limited security level, you can also use the Port Security prompts to control how the switch will respond in the event new MAC addresses are received by a port. You can instruct the switch to send a SNMP trap to a management station or disable the port. Note A new security level takes affect immediately on a switch once selected. Once you have selected the desired level of port security, return to the Omega main menu. 83 Chapter 4 Configuring the MAC Address Table This chapter describes the MAC address table and the static MAC address table. The chapter explains how to view the MAC addresses and how to modify the static table. This chapter also contains instructions on how to configure multicast addresses for the ports of the switch. Procedures relating to the MAC address table include the following: Displaying the MAC Address Table on page 87 Displaying the MAC Addresses of a Port on page 88 Displaying the Port Number of a MAC Address on page 89 Clearing All Dynamic MAC Addresses on page 90 Changing the Aging Time of the MAC Address Table on page 90 Procedures relating to the static MAC address table include the following: Displaying the Static MAC Address Table on page 92 Adding Addresses to the Static MAC Address Table on page 93 Deleting Addresses from the Static MAC Address Table on page 95 Clearing the Static MAC Address Table on page 96 Procedures relating to multicast addresses include the following: Configuring a Multicast Address on page 97 Changing a Multicast Port Assignment on page 99 Deleting a Multicast Address on page 99 85 Configuring the MAC Address Table MAC Address Table The MAC address table (also referred to as the forwarding table) is a snapshot of the source MAC addresses that a switch has learned and stored in its volatile memory. When a frame is received by a port on a switch, the source address of the frame is inspected to determine whether the address is already in the table. To prevent the table from becoming filled with addresses of devices that have become inactive and are no longer sending frames, MAC address are periodically deleted from the table. [. . . ] Table 8 describes the parameters and lists each parameter's default settings for the switch. The port numbers include the twenty-four 10Base-T or 100Base-TX ports. Table 8 Spanning Tree Protocol Parameters Parameter and Description Bridge Group Address Unique MAC group address, recognized by all bridges in the network Default N/A Bridge Identifier 32768 (bridge priority) Identifier for each bridge, consisting of two parts: a 16-bit bridge priority and a 48-bit network adapter address. Ports are numbered in absolute numbers; from 1-n for a multi-port switch including optional expansion ports, if any. [. . . ]