Cisco Systems 8.6 manual Understanding DHCPv6 and Autoconfiguration

Chapter 4 Configuring Settings on the Cisco Unified IP Phones

Network Configuration Menu

Table 4-4	IPv6 Configuration Menu Options (continued)
Option		Description	To Change
IPv6 TFTP Server 2		Optional backup IPv6 TFTP server that the phone uses if	1.	Unlock the CTL file or ITL file if
(SCCP phones only)		the primary IPv6 TFTP server is unavailable.		necessary. If both the CTL file
		If you make changes to the Alternate TFTP or IPv6 TFTP		and ITL file exist, unlock either
				of the files.
		servers, you must first unlock the CTL file or ITL file on
		the phone.	2.	Unlock network configuration
		When the phone looks for its TFTP server, it gives		options.
		precedence to manually assigned TFTP servers, regardless	3.	Enter an IP address for the IPv6
		of the protocol. If your configuration includes both IPv6		TFTP Server 1 option.
		and IPv4 TFTP servers, the phone prioritizes the order that	4.	Scroll to the IPv6 TFTP Server 2
		it looks for its TFTP server by giving priority to manually
				option, press the Edit softkey,
		assigned IPv6 TFTP servers and IPv4 TFTP servers. The
				and then enter a new backup
		phone looks for its TFTP server in the following order:
				TFTP server IP address.
		1. Manually assigned IPv6 TFTP Servers	5.	Press the Validate softkey, and
		2. Manually assigned IPv4 TFTP Servers		then press the Save softkey.
		3. DHCPv6 assigned TFTP Servers
		4. DHCP assigned TFTP Servers
		For information about the CTL file or ITL file, see Cisco
		Unified Communications Manager Security Guide. For
		information about unlocking the CTL file, see Unlocking
		the CTL and ITL Files, page 4-41.

Understanding DHCPv6 and Autoconfiguration

You can choose to configure the IP address and other network settings, such as the TFTP server, DNS server, domain, and name on an IP Phone manually or by using a router or a DHCP server to automatically assign the IP address and other network information. For more information on how the Auto IP Configuration and DHCPv6 settings determine where the IP Phone acquires its IPv6 address and other network settings, see Table 4-5.

.	Determining Where a Phone Acquires Its Network Settings
Table 4-5
DHCPv6	Auto IP Configuration	How the Phone Acquires its IP address and Network Settings
Disabled	Disabled	You must manually configure an IP address and the other network settings.
		Note When DHCPv6 is disabled, the Auto IP Configuration setting is
		ignored.
Disabled	Enabled	You must manually configure an IP address and the other network settings.
		Note When DHCPv6 is disabled, the Auto IP Configuration setting is
		ignored.

	Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
OL-23091-01		4-17