User Manual

24-Port and 48-Port Gigabit Ethernet PoE+ Smart Switches with 4 SFP Ports
Configure System Information User Manual124
Configure a DHCP L2 relay
If you enable and configure a DHCP relay agent on the switch, some Layer 2 (L2) devices do
not need to connect to a DHCP server on the physical network. A relay agent automatically
populates the gateway IP address (giaddr) field and adds the Relay Agent Information option
to DHCP messages. A DHCP server uses this option for IP addresses and other assignment
policies. A DHCP relay agent is usually an IP routing-aware device, which is also referred to
as Layer 3 relay agent. In some network configurations, Layer 2 (L2) devices must append
the Relay Agent Information option because they are closer to the end hosts.
An L2 device can operate as a bridge only for a network and might not include an IPv4
address on the network. If an L2 device lacks an IPv4 source address, the device cannot
relay packets directly to a DHCP server that is located on another network. In that situation,
the L2 device can append the Relay
Agent Information option and broadcast the DHCP
message.
Enable the DHCP L2 relay
You can enable the DHCP L2 relay.
To enable the DHCP L2 relay:
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 of
f-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.
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