Dhcp Option 82 Sub-Options; Configuration Notes - Dell PowerConnect B-FCXs Configuration Manual

As illustrated in
82 attributes when relaying a DHCP request packet to a DHCP server.
FIGURE 178
DHCP
Client
As illustrated in
forwarding a server reply packet back to a DHCP client.
FIGURE 179
DHCP
Client
The DHCP option 82 insertion/deletion feature is available only when DHCP snooping is enabled
for the client/server ports.

Configuration notes

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•

DHCP Option 82 sub-options

The Dell implementation of DHCP Option 82 supports the following sub-options:
•
•
•
These sub-options are described in the following sections.
PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Figure 178, the DHCP relay agent (the PowerConnect switch), inserts DHCP option
DHCP Option 82 attributes added to the DHCP packet
DHCP client
request packet
Figure 179, the PowerConnect switch deletes DHCP option 82 attributes before
DHCP Option 82 attributes removed from the DHCP packet
DHCP snooping and DHCP option 82 are supported on a per-VLAN basis.
DHCP option 82 follows the same configuration rules and limitations as for DHCP snooping.
For more information, refer to
Sub-Option 1 – Circuit ID
Sub-Option 2 - Remote ID
Sub-Option 6 – Subscriber ID
DHCP relay agent information (DHCP Option 82)
DHCP
Snooping
Switch
DHCP Relay Agent
DHCP
Snooping
Switch
DHCP Relay Agent
"Configuration notes and feature limitations"
39
DHCP
Server
DHCP Server
reply packet
DHCP
Server
on page 1351.
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