Cisco Systems 6921 manual Dhcp, Dynamic Host Configuration Protocol chapter

Chapter

What Networking Protocols are Used?

Table 1-4	Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol		Purpose	Usage Notes
Dynamic Host		DHCP dynamically allocates and assigns	DHCP is enabled by default. If disabled, you must
Configuration Protocol		an IP address to network devices.	manually configure the IP address, subnet mask,
(DHCP)		DHCP enables you to connect an IP phone	gateway, and a TFTP server on each phone locally.
		into the network and have the phone	Cisco recommends that you use DHCP custom
		become operational without your needing	option 150. With this method, you configure the
		to manually assign an IP address or to	TFTP server IP address as the option value. For
		configure additional network parameters.	additional supported DHCP configurations, go to
			the Dynamic Host Configuration Protocol chapter
			and the Cisco TFTP chapter in the Cisco Unified
			Communications Manager System Guide.
			Note If you cannot use option 150, you may try
			using DHCP option 66.
Hypertext Transfer		HTTP is the standard way of transferring	Cisco Unified IP Phones use HTTP for the XML
Protocol (HTTP)		information and moving documents across	services and for troubleshooting purposes.
		the Internet and the web.
IEEE 802.1X		The IEEE 802.1X standard defines a	The Cisco Unified IP Phone implements the IEEE
		client-server-based access control and	802.1X standard by providing support for the
		authentication protocol that restricts	following authentication methods: EAP-FAST,
		unauthorized clients from connecting to a	EAP-TLS, and EAP-MD5.
		LAN through publicly accessible ports.	When 802.1X authentication is enabled on the
		Until the client is authenticated, 802.1X	phone, you should disable the PC port and voice
		access control allows only Extensible	VLAN. Refer to the “Supporting 802.1X
		Authentication Protocol over LAN	Authentication on Cisco Unified IP Phones” section
		(EAPOL) traffic through the port to which	on page 1-21for additional information.
		the client is connected. After
		authentication is successful, normal traffic
		can pass through the port.
Internet Protocol (IP)		IP is a messaging protocol that addresses	To communicate using IP, network devices must
		and sends packets across the network.	have an assigned IP address, subnet, and gateway.
			IP addresses, subnets, and gateways identifications
			are automatically assigned if you are using the
			Cisco Unified IP Phone with Dynamic Host
			Configuration Protocol (DHCP). If you are not
			using DHCP, you must manually assign these
			properties to each phone locally.
Link Layer Discovery		LLDP is a standardized network discovery	The Cisco Unified IP Phone supports LLDP on the
Protocol (LLDP)		protocol (similar to CDP) that is supported	PC port.
		on some Cisco and third-party devices.

	Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
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