Brocade Communications Systems Brocade ICX 6650 6650 Manuel D’Utilisation

DHCP relay agent information

As illustrated in 

, the DHCP relay agent (the Brocade ICX 6650 switch), inserts DHCP 

option 82 attributes when relaying a DHCP request packet to a DHCP server. 

FIGURE 19

 DHCP Option 82 attributes added to the DHCP packet

As illustrated in 

, the Brocade ICX 6650 device deletes DHCP option 82 attributes before 

forwarding a server reply packet back to a DHCP client.

FIGURE 20

 DHCP Option 82 attributes removed from the DHCP packet

The DHCP option 82 insertion/deletion feature is available only when DHCP snooping is enabled 
for the client/server ports.

Configuration notes for DHCP option 82

•

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 

DHCP option 82 sub-options

The Brocade implementation of DHCP Option 82 supports the following sub-options:

•

Sub-Option 1 – Circuit ID

•

Sub-Option 2 - Remote ID

•

Sub-Option 6 – Subscriber ID

These sub-options are described in the following sections.