Dell POWEREDGE M1000E - Manual (Page 499)

Configuring Routing 497
BOOTP/DHCP Relay Agent
BootP/DHCP Relay Agent enables BootP/DHCP clients and servers to exchange BootP/DHCP messages
across different subnets. The relay agent receives the requests from the clients, and checks the valid hops
and giaddr fields. If the number of hops is greater than the configured, the agent assumes the packet is
looped through the agents and discards the packet. If giaddr field is zero the agent must fill in this field
with the IP address of the interface on which the request was received. The agent unicasts the valid
packets to the next configured destination. The server responds with a unicast BOOTREPLY addressed
to the relay agent closest to the client as indicated by giaddr field. Upon reception of the BOOTREPLY
from the server, the agent forwards this reply as broadcast or unicast on the interface form where the
BOOTREQUEST was arrived. This interface can be identified by giaddr field.
The PowerConnect M6220/M6348/M8024 DHCP component also supports DHCP relay agent options
to identify the source circuit when customers are connected to the Internet with high-speed modem.
The relay agent inserts these options when forwarding the request to the server and removes them when
sending the reply to the clients.
If an interface has more than one IP address, the relay agent should use the primary IP address
configured as its relay agent IP address.
The BOOTP/DHCP Relay Agent menu page contains links to web pages that configure and display
BOOTP/DHCP relay agent. To display this page, click Routing > BOOTP/DHCP Relay Agent in the
tree view. Following are the web pages accessible from this menu page:
• BOOTP/DHCP Relay Agent Configuration
• BOOTP/DHCP Relay Agent Status