Configure Dhcp L2 Relay And Dhcp Snooping; Configure A Dhcp L2 Relay - NETGEAR GC728X User Manual

Insight Managed 28-Port Gigabit Ethernet Smart Cloud Switch with 2 SFP 1G & 2 SFP+ 10G Fiber Ports
Field
DSCP
LLDP Unknown TLVs
Type
Value

Configure DHCP L2 Relay and DHCP Snooping

The switch supports DHCP L2 Relay, DHCP snooping, and Dynamic ARP Inspection (DAI).
DHCP snooping and DAI are Layer 2 security features that examine traffic to help prevent
accidental and malicious attacks on the switch or network.
The following sections describe how to configure DHCP L2 Relay, DHCP snooping, and
Dynamic ARP Inspection (DAI):
•

Configure a DHCP L2 Relay

• Configure DHCP Snooping
Configure a DHCP L2 Relay
DHCP relay agents eliminate the need to connect to 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, a need
might exist for Layer 2 devices to append the Relay Agent Information option as they are
closer to the end hosts.
These Layer 2 devices typically operate only as bridges for the network and might not include
an IPv4 address on the network. Lacking a valid IPv4 source address, they cannot relay
packets directly to a DHCP server located on another network. These Layer 2 devices
append the Relay Agent Information option and broadcast the DHCP message.
Enable the Global DHCP L2 Relay Settings
You can enable the global DHCP L2 relay settings for the switch.

To enable DHCP L2 relay global settings:
1. Connect your computer to the same network as the switch.
You can use a WiFi or wired connection to connect your computer to the network, or
connect directly to a switch that is off-network using an Ethernet cable.
2. Launch a web browser.
3. In the address field of your web browser, enter the IP address of the switch.
Description
The DSCP associated with a particular policy type.
The unknown TLV type field.
The unknown TLV value field.
on page 94
on page 98
Configure System Information
94