Setup
DHCP Relay
SPS208G/SPS224G4/SPS2024 Service Provider Switches User Guide 23
2
Full L2 DHCP Relay
Full L2 DHCP Relay is used when the client ingress VLAN is different than the
VLAN on which the DHCP servers are connected. If DHCP servers are located on
the ingress VLAN, transparent L2 DHCP Relay is used.
The Option 82 information is added to the packets that are relayed to DHCP
server.
This mode also forces Option 82 insertion of DHCP Snooping, if activated.
L2 DHCP Relay Quick Start
L2 DHCP Relay
To set up Option 82 Insertion if the DHCP Server is located on a different VLAN
than the clients:
STEP 1 In the
DHCP Relay Screen
, select Enable DHCP Relay.
STEP 2 Add the clients (ingress) VLAN to the list of enabled VLAN. Ensure that the ingress
VLAN does not have an assigned IP address.
STEP 3 Add the DHCP Server IP address to the list of DHCP Servers.
NOTE Using the Command Line Interface, ensure that the switch successfully pings the
DHCP server.
Clients and DHCP Server on the Same VLAN
To set up Option 82 Insertion if the DHCP Server is located in the same VLAN as
the clients:
STEP 1 In the
DHCP Snooping Screen
, select Enable DHCP Snooping.
STEP 2 In the
DHCP Snooping Enabled VLAN Screen (SPS 224G4)
, add the clients VLAN
to the list of enabled VLANs.
STEP 3 In the
DHCP Trusted Interface Screen
, set the DHCP server port as a trusted port.
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