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Cabletron Systems ELS100-24TXG Configuring Broadcast Cutoff Rate, Setting a Default Gateway, Configuring BootP/DHCP

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Configuring Broadcast Cutoff Rate

This setting affects the throttling of excessive broadcast or unicast

packets with unknown MAC addresses being handled by the switch.

Normally, when these types of packets are received by the switch, they

are forwarded (flooded) to every port on the switch or on a VLAN.

However, if the receiving rate of these packets exceeds the broadcast

cutoff rate, the switch will throttle back or limit the forwarding of these

packets based on the configured Broadc ast Cuto ff Rate. Th is mechanism

helps to prevent broadcast storms, a problem often encountered in

Ethernet networks.

To configure the broadcast cutoff rate, do the following:

1. Select Switch Configuration Menu from the Main Menu.

2. Select Broadcast Cutoff Rate, en ter t he ra te val ue, a nd pr ess [Enter ].

Valid values are in the range from 100 to 500,000 per second. This

rate value is applied to each grouping of 8 10/100 por ts and eac h Gi-

gabit Ethernet port on the sw itch . A setti ng o f 500 ,000 essen tial ly d is-

ables this feature.

Setting a Default Gateway

The Default Gateway parameter defines the IP address of a router or

other network device to which IP packets are to be sent if destined for a

subnet outside of that which the switch is operating.

To set a default gateway, do the following:

1. Select System Configuration Menu from the Main Menu.

2. Select Default Gateway.

3. Enter the gateway IP address. Press [Enter].

Configuring BootP/DHCP

The DHCP and BootP protocols allow you to automatically configure the

switch’s IP address information. Enabling this feature greatly speeds up

device configuratio n, especially when a l arge number of device s are

installed.

A DHCP and/or BootP server must be operating on the network and be

properly configured for this option to work. When this option is enabled,

the switch first tries to obtain an IP address from a DHCP server. If this

fails, the switch tries to obtain an IP address from a BootP server. If this

fails, the switch uses a previously configured IP address, if one exists.

To configure BootP/DHCP, do the following:

1. Select System Configuration Menu from the Main Menu.

2. Select BootP/DHCP Enable.

This selection toggles between Enable and Disable.

Contents

Main NOTICE FCC NOTICE DOC NOTICE VCCI NOTICE CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT CABLETRON SOFTWARE PROGRAM LICENSE EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY UNITED STATES GOVERNMENT RESTRICTED RIGHTS SAFETY INFORMATION LASER RADIATION AND CONNECTORS DECLARATION OF CONFORMITY Page TABLE OF CONTENTS Page Page Page PREFACE Purpose Audience Conventions Other Conventions Organization Page Page 1. PRODUCT OVERVIEW Description Features Front Panel 4 Product Overview ELS100-24TXG Figure 1-3. Port LEDs Default Configuration Figure 1-4. Port LEDs LED Mode Button Pressed The numbers above and below the port LEDs identify the LEDs associated with a specific RJ-45 port. Link LEDs Activity LEDs Rear Panel Feature Summaries IEEE 802.1D Bridge Spanning Tree Protocol Frame Buffering and Frame Latency Software Download Non-volatile Parameter Storage Configuration and Management Interfac es RMON Port Mirroring Auto-negotiation Broadcast Throttling BootP/DHCP LEDs Full Duplex Mode Flow Control Application Examples Client/Server Network Application Local Backbone Application 2. INSTALLATION Inspecting Your Shipment Site Requirements Page Mounting the Switch on a Wall Mounting the Switch in a Rack Connecting a Terminal to the Console Port Powering the Switch Power-Up Network Cable Requirements Copper Fiber 10Base-T/100Base-TX Ports 1000Base-X Gigabit Ethernet Ports Page 3. ELS100-24TXG USER INTERFACE Overview User Access Factory Defaults 26 ELS100-24TXG User Interface ELS100-24TXG Menu Hierarchy Figure 3-2 shows the ELS100-24TXG switch user interface menu hierarchy. Figure 3-2. ELS100-2 4 TXG User Interface M enu Hierarchy Main Menu Figure 3-3. Main Menu System Configuration Menu Figure 3-4. System Configuration Menu SNMP Configuration Menu Figure 3-5. SNMP Configuration Menu Switch Configuration Menu Figure 3-6. Switch Configuration Menu Forwarding Table Configuration Menu Forwarding Table Configuration Menu (continued) Spanning Tree Configuration Menu Spanning Tree Configuration Menu (continued) Spanning Tree Port Configuration Menu Figure 3-9. Spanning Tree Port Configuration Menu Spanning Tree Port #n Configuration Menu VLAN Configuration Menu VLAN Menu VLAN #n Configuration Menu VLAN Port Menu Figure 3-14. VLAN Port Configuration Menu Class of Service Configuration Menu Port Priority Menu Figure 3-16. Port Priority Configuration Menu Port Menu Figure 3-17. Port Menu Port Configuration Menu Figure 3-18. Port Configuration Menu Switch Statistics Screen Figure 3-19. Switch Statistics Screen Switch Summary Screen Port Statistics Screen Figure 3-21 Port Statistics Screen (continued) General Information Screen Download Software Menu Save Current Configuration To save your current config uration, do the following: Return to Default Configuration Logout Reset 4. CONFIGURING & MONITORING THE SWITCH Common Tasks Setting Password Protection Assigning an IP Address Checking Network Configuration Status Connecting via Telnet Setting SNMP Management Access Viewing Switch Statistics Configuring Port Mirroring Downloading a Software Upgrade Downloading Via the Serial Port Downloading Via TFTP Configuring Spanning Tree Parameters Configuring VLANs Configuring Class of Service Configuring Port Operation Configuring the Forwarding Table Page Configuring Broadcast Cutoff Rate Setting a Default Gateway Configuring BootP/DHCP Page 5. SNMP MANAGEMENT The SNMP Protocol MIB Objects RFC 1213 (MIB-II) Page Table 5-2. Switch Information Variables continued on next page Table 5-2 Switch Information Variables (continued) Compiling MIB Extensions: Cabletron Website http://www.cabletron.com APPENDIX A. TECHNICAL SPECIFICATIONS General Standards Compliance Certification Data Rate Page Port Specifications Console Port 10Base-T and 100Base-TX Ports Power Cord Set Requirements Country-Specific Requirements Note 1 Page APPENDIX B. SPANNING TREE CONCEPTS General Spanning Tree Features Spanning Tree Protocol in a Network Spanning Tree Protocol Parameters Table B-1. Spanning Tree Protocol Defaults Spanning Tree Protocol Operation Page APPENDIX C. FLOW CONTROL Page APPENDIX D. VIRTUAL LANS (VLANS) VLANs and Frame Tagging ELS100-24TXG VLAN Configuration VLAN ID Ports in VLAN VLAN Egress Ports VLAN Access Ports VLAN Hybrid Ports VLAN Application Example APPENDIX E. CLASS OF SERVICE Page APPENDIX F. ACRONYMS & ABBREVIATIONS Page INDEX A B C D H I L M N T U V W