C h a p t e r 3 F e a t u r e d F u n c t i o n s
3 - 2 1
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request packet and forward it to a specified server. The operating theory is shown in the figure below.
Notice:
When a DHCP request packet comes, the DHCP relay receives it and then sends it to all VLANs.
But according to RFC 2131, when a unicast DHCP request packet renews, it will be sent to a DHCP
server directly without passing a DHCP relay, so it is recommended to make sure that the DHCP
client can ping the server after getting an IP address.
3.2.4.1
Relay
The DHCP relay sends a unicast DHCP packet to the specified server(s). You can enable or disable a DHCP relay
function, and configure the parameters on the switch.
DHCP Relay Configuration
Description
Factory default
Relay Mode
Specify the status of the DHCP relay on the switch:
Disable
: The DHCP relay is disabled. This is the default setting.
Enable
: The DHCP relay is enabled.
Disable
Relay Server
Specify the DHCP relay server IP address.
0.0.0.0
Relay Information Mode
Specify the DHCP relay information mode option operation.
Disable
: Enable DHCP relay information mode operation.
Enable
: Disable DHCP relay information mode operation.
Enabled
Relay Information Policy
Specify the DHCP relay information option policy.
Replace
: Replace the original relay information when a DHCP message that
already contains it is received.
Keep
: Keep the original relay information when a DHCP message that already
contains it is received.
Drop
: Drop the package when a DHCP message that already contains relay
information is received.
Replace
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