User Manual

8-Port or 16-Port Gigabit Smart Managed Pro Switch Model GS418TPP, GS510TLP, and GS510TPP
Configure System Information User Manual104
Configure a DHCP L2 relay, DHCP
snooping, and dynamic ARP inspection
The switch supports a 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.
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
assignment policies for other settings. 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.
Network Policies
Application Type The media application type associated with the policy advertised by the
remote device.
VLAN ID The VLAN ID associated with the policy.
VLAN Type Specifies whether the VLAN associated with the policy is tagged or untagged.
User Priority The priority associated with the policy.
DSCP The DSCP associated with a particular policy type.
LLDP Unknown TLVs
Type The unknown TLV type field.
Value
The unknown TLV value field.
Field Description