Cisco Systems OL-16066-01 appendix 169

Appendix K Router Platform User Interface Reference

		DHCP Policy Page
Table K-74	DHCP Policy Page (Continued)
Option 66		The IP address of the TFTP server required by IP phones for configuration,
		as defined using DHCP option 66.
Add button		Opens the IP Pool Dialog Box, page K-171. From here you can define a
		DHCP IP address pool.
Edit button		Opens the IP Pool Dialog Box, page K-171. From here you can edit the
		selected IP pool.
Delete button		Deletes the selected IP pools.
Relay parameters
Policy		The policy that DHCP relay agents implement when they receive messages
		already containing relay information:
		• Drop—The relay agent discards messages with existing relay
		information if option-82 information is also present.
		• Keep—The relay agent retains existing relay information.
		• Replace—The relay agent overwrites existing information with its own
		relay information.
Option		When selected, enables DHCP Option 82 data insertion in message requests
		forwarded from the DHCP client to the server. DHCP Option 82 provides the
		DHCP server with both the switch and port ID of the requesting client. This
		option makes it possible to locate where a user is physically connected to the
		network and prevent spoofing. See Understanding DHCP Option 82,
		page 15-119.
		When deselected, DHCP Option 82 is disabled.
Check		When selected, DHCP Option 82 reply packets received from the DHCP
		server are validated. Invalid messages are dropped; valid messages are
		stripped of the option-82 field before being forwarded to the DHCP client.
		When deselected, the option-82 field is removed from the packet without
		being checked first for validity.
Save button		Saves your changes to the Security Manager server but keeps them private.
		Note To publish your changes, click the Submit button on the toolbar.

	User Guide for Cisco Security Manager 3.2
OL-16066-01		K-169