Netgear GSM7328Sv2 - ProSAFE 24+4 Gigabit Ethernet L3 Managed Stackable Switch 管理员指南
Chapter 27. DHCP L2 Relay and L3 Relay
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27.
DHCP L2 Relay and L3 Relay
This chapter includes the following sections:
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.
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.
agent Information option as they are closer to the end hosts.
DHCP Server #1
Host #1
Host #2
Layer 2 Switch #1
1/0/4
1/0/5
1/0/6
Figure 1. DHCP L2 Relay