Trunking also causes unnecessary broadcast / multicast / unknown unicast traffic to hit the phone link. As all the VLANs for a particular interface are trunked to the phone, it increases the number of STP instances the switch has to manage. When you connect an IP phone to a switch using a trunk link, it can cause high CPU utilization in the switches.
The configuration of the Catalyst switch contains these configurations:Ĭonfigure the Switch Port to Carry Both Voice and Data TrafficĬonfigure the Switch Using Cisco Predefined Macro Note: Use the Command Lookup Tool ( registered customers only) to obtain more information on the commands used in this section. In this section, you are presented with the information to configure the features described in this document. It enables various Cisco QoS components based on the network environment and Cisco best-practice recommendations. Cisco AutoQoS automates consistent deployment of QoS features across Cisco routers and switches.
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Refer to Configuring QoS for more information on QoS.
QoS uses classification and scheduling to transmit network traffic from the switch in a predictable manner. This is useful when CDP is disabled or not available.īecause the sound quality of an IP phone call can deteriorate if the data is sent unevenly, the switch uses QoS-based on IEEE 802.1p class of service (CoS). However, you can specify the consumption of the powered device for the entire switch (or for a particular interface) to provide extra functionality from your switch. Normally, this automatic adjustment works well, and no further configuration is required or recommended. When the switch receives a Cisco Discovery Protocol (CDP) packet from the powered device, the wattage automatically adjusts downward to the specific amount required by that device.
#OFFICE LIVE MEETING PHONE COMMANDS SOFTWARE#
The maximum is 7 W on a legacy PoE module and 15.4W on the IEEE PoE modules introduced in Cisco IOS® Software Release 12.2(18)EW. By default, when the switch detects a powered device on an interface, it assumes that the powered device consumes the maximum port it can provide. If your switch has a module that can provide Power over Ethernet (PoE) to end stations, you can set each interface on the module to automatically detect and apply PoE if the end station requires power. The switch port can be either access VLAN or trunk VLAN, but you need to configure a voice VLAN to carry the voice traffic. The switch has two VLANs: one carries data traffic and one carries voice traffic. The other port is an internal port and is not physically viewable. Note: Only two ports are physically viewable. Port 2 is an internal 10/100 interface that carries the phone traffic. Port 1 connects to the Catalyst switch or other device that supports voice-over-IP. The Cisco IP phone contains an integrated three-port 10/100 switch. This document explains the configuration of the switches that connect the PCs and IP phones on a switch port. Refer to Cisco Technical Tips Conventions for more information on document conventions. This document is not restricted to specific software and hardware versions. There are no specific requirements for this document. The switch port configuration uses a predefined macro which configures the switch port and QoS settings with minimum commands. This document includes the switch port, power inline, and quality of service (QoS) configurations. This document provides sample configurations on Catalyst switches in order to connect to Cisco IP phones.
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