Hewlett-Packard 9308M Manual

A SERVICE OF

next previous

Installation and Getting Started Guide

DHCP

Server

207.95.7.6

Server

Step 3:

Router

Host 1

200.95.6.x

Host 2

192.95.5.x

Sub-net 1

Sub-net 2

Hub

HP Switch 4000

Interface

Interface

Interface

Step 2:

The HP 6208M-SX stamps each

DHCP request with the gateway

address of the corresponding

sub-net of the receiving port.

2

8

14

Router forwards the DHCP request to the

server without touching the gateway

address inserted in the packet by the switch

Gateway addresses:

192.95.5.1

200.95.6.1

202.95.1.1

202.95.5.1

Step 1:

Host 3 Host 4

DHCP IP address requests

for Hosts 1,2,3 and 4 in

202.95.1.x

202.95.5.x

Sub-nets 1, 2, 3 and 4

Sub-net 3

Sub-net 4

Figure 6.11 DHCP requests in a network with DHCP Assist operating on the HP 6208M-SX

When the stamped DHCP discovery packet is then received at the router, it is forwarded to the DHCP server. The

DHCP server then extracts the gateway address from each request and assigns an available IP address within the

corresponding IP sub-net (

Figure 6.12). The IP address is then forwarded back to the workstation that originated

the request.

NOTE: The DHCP relay function of the connecting router needs to be turned on.

6 - 78

Power

Console