Cisco 7985G Administration Guide - Page 45
Understanding How the Cisco Unified IP Video Phone Interacts with the Cisco Catalyst Family
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Chapter 2 Preparing to Install the Cisco Unified IP Video Phone on Your Network Understanding Interactions with Other Cisco Unified IP Telephony Products Related Topic • Telephony Features that are Available for the Phone, page 5-2 Understanding How the Cisco Unified IP Video Phone Interacts with the Cisco Catalyst Family of Switches The Cisco Unified IP Video Phone 7985G includes an internal Ethernet switch that enables proper forwarding of appropriate packets to the phone, to the access port (labeled 10/100 PC on the phone), and to the network port (labeled 10/100 SW on the phone). If a computer is connected to the PC port, the computer and the phone share the same physical link to the switch and share the same port on the switch. The following implications for the VLAN configuration on the network apply for the shared physical link: • The current VLANs configuration may be on an IP subnet basis; however, additional IP addresses may not be available to assign the phone to the same subnet as other devices that connect to the same port. • Data traffic that exists on the VLAN-supported phones may reduce the quality of voice-over-IP traffic. You can resolve these issues by isolating the voice and video traffic onto a separate VLAN on each port that is connected to a phone. The switch port that is configured for the phone connection would have separate VLANs that are configured for carrying: • Voice and video traffic to and from the IP phone (auxiliary or voice VLAN) • Data traffic to and from the PC connected to the switch through the PC port of the IP phone (native or access VLAN) Isolating the phones on a separate, auxiliary VLAN increases the quality of the voice traffic and allows a large number of phones to be added to an existing network where enough IP addresses for each phone do not exist. For more information, refer to the documentation that is included with the Cisco Catalyst switch. Related Topics • Understanding Phone Configuration Files, page 2-6 OL-8726-02 Cisco Unified IP Video Phone 7985G Administration Guide 2-3