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GS700TR Smart Switch Software Administration Manual
2-44 Configuring System Information
v1.0, May, 2008
6. Click Refresh to refresh the page with the most current data from the switch.
7. Click Cancel to cancel the configuration on the screen and reset the data on the screen to the
latest value of the switch.
8. If you make any changes to the page, click Apply to apply the change to the system.
DHCP Relay
BootP/DHCP Relay 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.
GS700TR Smart Switch 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 folder contains links to the following web pages that configure
and display BOOTP/DHCP relay agent:
• “BOOTP/DHCP Relay Configuration” on page 2-45
Table 2-27. DHCP Filtering Interface Configuration Fields
Field Description
Interface Selects the interface for which data is to be displayed or configured.
Trust Mode Enables or disables DHCP Filtering on the selected interface.
• Enable: Any DHCP responses received on this port are forwarded.
• Disable: Any DHCP (or BootP) responses received on this port are
discarded.