Cisco 7975G Administration Guide - Page 18
What Networking Protocols Are Used - power requirements
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What Networking Protocols Are Used? Chapter 1 An Overview of the Cisco Unified IP Phone What Networking Protocols Are Used? Cisco Unified IP Phones support several industry-standard and Cisco networking protocols required for voice communication. Table 1-1 provides an overview of the networking protocols that the Cisco Unified IP Phone 7975G supports. Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone Networking Protocol Purpose Usage Notes Bootstrap Protocol (BootP) BootP enables a network device such as the Cisco Unified IP Phone to discover certain startup information, such as its IP address. If you are using BootP to assign IP addresses to the Cisco Unified IP Phone, the BOOTP Server option shows "Yes" in the network configuration settings on the phone. Cisco Discovery Protocol (CDP) CDP is a device-discovery protocol that runs on all Cisco-manufactured equipment. Using CDP, a device can advertise its existence to other devices and receive information about other devices in the network. The Cisco Unified IP Phone uses CDP to communicate information such as auxiliary VLAN ID, per port power management details, and Quality of Service (QoS) configuration information with the Cisco Catalyst switch. Dynamic Host Configuration Protocol (DHCP) DHCP dynamically allocates and assigns an IP address to network devices. DHCP enables you to connect an IP phone into the network and have the phone become operational without your needing to manually assign an IP address or to configure additional network parameters. DHCP is enabled by default. If disabled, you must manually configure the IP address, subnet mask, gateway, and a TFTP server on each phone locally. Cisco recommends that you use DHCP custom option 150. With this method, you configure the TFTP server IP address as the option value. For additional information about DHCP configurations, refer to the "Cisco TFTP" chapter in Cisco Unified Communications Manager System Guide. Hypertext Transfer Protocol (HTTP) HTTP is the standard way of transferring Cisco Unified IP Phones use HTTP for the information and moving documents across the XML services and for troubleshooting Internet and the web. purposes. IEEE 802.1X The IEEE 802.1X standard defines a client-server-based access control and authentication protocol that restricts unauthorized clients from connecting to a LAN through publicly accessible ports. Until the client is authenticated, 802.1X access control allows only Extensible Authentication Protocol over LAN (EAPOL) traffic through the port to which the client is connected. After authentication is successful, normal traffic can pass through the port. The Cisco Unified IP Phone implements the IEEE 802.1X standard by providing support for the EAP-MD5 option for 802.1X authentication. When 802.1X authentication is enabled on the phone, you should disable the PC port and voice VLAN. Refer to the "Supporting 802.1X Authentication on Cisco Unified IP Phones" section on page 1-15 for additional information. Cisco Unified IP Phone 7975G Administration Guide for Cisco Unified Communications Manager 6.1 1-4 OL-14640-01
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