Cabletron Systems ELS100-24TXG Installation And User Manual

Contents

Cabletron Systems ELS100-24TXG Installation And User Manual Manual pdf 77 page image

9032947 Configuring & Monitoring The Switch 63Configuring Broadcast Cutoff RateThis setting affects the throttling of excessive broadcast or unicastpackets with unknown MAC addresses being handled by the switch.Normally, when these types of packets are received by the switch, theyare forwarded (flooded) to every port on the switch or on a VLAN.However, if the receiving rate of these packets exceeds the broadcastcutoff rate, the switch will throttle back or limit the forwarding of thesepackets based on the configured Broadcast Cutoff Rate. This mechanismhelps to prevent broadcast storms, a problem often encountered inEthernet networks.To configure the broadcast cutoff rate, do the following:1. Select Switch Configuration Menu from the Main Menu.2. Select Broadcast Cutoff Rate, enter the rate value, and press [Enter].Valid values are in the range from 100 to 500,000 per second. Thisrate value is applied to each grouping of 8 10/100 ports and each Gi-gabit Ethernet port on the switch. A setting of 500,000 essentially dis-ables this feature.Setting a Default GatewayThe Default Gateway parameter defines the IP address of a router orother network device to which IP packets are to be sent if destined for asubnet 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/DHCPThe DHCP and BootP protocols allow you to automatically configure theswitch’s IP address information. Enabling this feature greatly speeds updevice configuration, especially when a large number of devices areinstalled.A DHCP and/or BootP server must be operating on the network and beproperly 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 thisfails, the switch tries to obtain an IP address from a BootP server. If thisfails, 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.