Installation and Getting Started Guide

4.Enter the new value for the cache size. The value you enter specifies the maximum number of entries the cache can hold.

5.Click Apply to save the changes to the device’s running-config.

6.Select the Save link at the bottom of the dialog. Select Yes when prompted to save the configuration change to the startup-config file on the device’s flash memory.

7.Click on the plus sign next to Command in the tree view to list the command options.

8.Select the Reload link and select Yes when the Web management interface asks you whether you really want to reload the software. Changes to cache and table sizes do not take effect until you reload the software.

Configuring Forwarding Parameters

The following configurable parameters control the forwarding behavior of HP routing switches:

•Time-To-Live (TTL) threshold

•Forwarding of directed broadcasts

•Forwarding of source-routed packets

•Ones-based and zero-based broadcasts

All these parameters are global and thus affect all IP interfaces configured on the routing switch.

To configure these parameters, use the procedures in the following sections.

Changing the TTL Threshold

The TTL threshold prevents routing loops by specifying the maximum number of router hops an IP packet originated by the routing switch can travel through. Each device capable of forwarding IP that receives the packet decrements (decreases) the packet’s TTL by one. If a device receives a packet with a TTL of 1 and reduces the TTL to zero, the device drops the packet.

The default TTL is 64. You can change the TTL to a value from 1– 255.

To modify the TTL, use either of the following methods.

USING THE CLI

To modify the TTL threshold to 25, enter the following commands:

HP9300(config)# ip ttl 25

Syntax: ip ttl <1-255>

USING THE WEB MANAGEMENT INTERFACE

1.Log on to the device using a valid user name and password for read-write access. The System configuration panel is displayed.

2.Click on the plus sign next to Configure in the tree view to display the list of configuration options.

3.Click on the plus sign next to IP to display the list of IP configuration options.

4.Select the General link to display the IP configuration panel.

5.Enter a value from 1 – 255 into the TTL field.

6.Click the Apply button to save the change to the device’s running-config file.

7.Select the Save link at the bottom of the dialog. Select Yes when prompted to save the configuration change to the startup-config file on the device’s flash memory.

Enabling Forwarding of Directed Broadcasts

A directed broadcast is an IP broadcast to all devices within a single directly-attached network or sub-net. A net­ directed broadcast goes to all devices on a given network. A sub-net-directed broadcast goes to all devices within a given sub-net.

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