Netgear GSM7328SNA 7000 Series Managed Switch Administration Guide for Softwar - Page 424
DHCP L2 Relay and L3 Relay, DHCP L2 Relay
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27. DHCP L2 Relay and L3 Relay 27 This chapter includes the following sections: • DHCP L2 Relay • DHCP L3 Relay on page 430 • Confige a DHCP L3 Relay on page 434 DHCP L2 Relay DHCP relay agents eliminate the need to have a DHCP server on each physical network. Relay agents populate the giaddr field and also append the Relay Agent Information option to the DHCP messages. DHCP servers use this option for IP addresses and other parameter assignment policies. These DHCP relay agents are typically IP routing-aware devices and are referred to as Layer 3 relay agents. In some network configurations, there is a need for Layer 2 devices to append the relay agent Information option as they are closer to the end hosts. Host #1 1/0/5 1/0/6 1/0/4 Layer 2 Switch #1 DHCP Server #1 Host #2 Figure 1. DHCP L2 Relay Chapter 27. DHCP L2 Relay and L3 Relay | 424
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