Brocade Multi-Service IronWare Switching Configuration Gui Manual de usuario Pagina 796

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766 Multi-Service IronWare Switching Configuration Guide
53-1003036-02
DHCP option 82 insertion
19
The Brocade device inserts DHCP option 82 when relaying DHCP request packets to DHCP servers.
When DHCP server reply packets are forwarded back to DHCP clients, and sub-option 2 matches
the local port MAC address, then DHCP option 82 is deleted. The vlan/port information is used to
forward the DHCP reply. Refer to the following figures:
FIGURE 196 DHCP option 82 is added to the packet
FIGURE 197 DHCP option 82 is removed from the packet
The option 82 insertion/deletion feature is available only when DHCP snooping is enabled for the
client/server ports, and when the device is configured as a DHCP relay agent. By default, DHCP
option 82 is off.
DHCP option 82 contains two sub-options; sub-option 1 (circuit ID) and sub-option 2 (remote ID).
Sub-option 1, relay agent circuit ID is in the following format.
VLAN id (2 bytes) / module id (1 byte) / port id (1 byte) (The module and port id will be 1
based).
The circuit ID identifies the location of the port, showing where the DHCP request comes from.
Typical address allocation is based on the gateway address of the relay agent.
Sub-option 2, Remote ID is in the following format.
Brocade NetIron XMR base MAC address (6 bytes)
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