Hp 2910AL User Manual download pdf (Page 179)

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Configuring IP Addressing

Loopback Interfaces

Note Designating a primary VLAN other than the default VLAN affects the switch’s

use of information received via DHCP/Bootp. For more on this topic, refer to

the chapter describing VLANs in the Advanced Traffic Management Guide

for your switch.

After you reconfigure or reboot the switch with DHCP/Bootp enabled in a

network providing DHCP/Bootp service, the switch does the following:

■ Receives an IP address and subnet mask and, if configured in the server,

a gateway IP address and the address of a Timep server.

■ If the DHCP/Bootp reply provides information for downloading a config-

uration file, the switch uses TFTP to download the file from the designated

source, then reboots itself. (This assumes that the switch or VLAN has

connectivity to the TFTP file server specified in the reply, that the config-

uration file is correctly named, and that the configuration file exists in the

TFTP directory.)

Loopback Interfaces

This section describes how to configure and use user-defined loopback inter-

faces on the switch.

Introduction

By default, each switch has an internal loopback interface (lo0) with the IP

address 127.0.0.1. This IP address is used only for internal traffic transmitted

within the switch and is not used in packet headers in egress traffic sent to

network devices.

You can configure up to seven other loopback interfaces (lo1, lo2, lo3, and so

on) on the switch to use to transmit network traffic across the network. Each

loopback interface can have multiple IP addresses. Routing protocols, such

as RIP, advertise the configured loopback addresses throughout a network or

autonomous system.

User-defined loopback addresses provide the following benefits:

■ A loopback interface is a virtual interface that is always up and reachable

as long as at least one of the IP interfaces on the switch is operational. As

a result, a loopback interface is useful for debugging tasks since its IP

address can always be pinged if any other switch interface is up.

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