Dell PowerEdge M520 Dell PowerConnect M6220/M6348/M8024/M8024-k CLI Referen - Page 757
Voice VLAN Commands, Commands in
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37 Voice VLAN Commands The Voice VLAN feature enables switch ports to carry voice traffic with defined priority so as to enable separation of voice and data traffic coming onto the port. Using Voice VLAN ensures that sound quality of an IP phone is safeguarded from deterioration when the data traffic on the port is high. The switch can be configured to support voice VLAN on a port connecting to the VoIP phone. When a VLAN is associated with the voice VLAN port, then the VLAN ID information is passed onto the VoIP phone using the LLDPMED mechanism. The voice data coming from the VoIP phone is tagged with the exchanged VLAN ID; thus, regular data arriving on the switch is given the default PVID of the port, and the voice traffic is received on a predefined VLAN. The two types of traffic are therefore segregated so that better service can be provided to the voice traffic. When a dot1p priority is associated with the voice VLAN port instead of VLAN ID, then the priority information is passed onto the VoIP phone using the LLDP-MED mechanism. Thus, the voice data coming from the VoIP phone is tagged with VLAN 0 and with the exchanged priority. Regular data arriving on the switch is given the default priority of the port (default 0), and the voice traffic is received with higher priority, thus segregating both the traffic to provide better service to the voice traffic. The switch can be configured to override the data traffic CoS. This feature enables overriding the 802.1P priority of the data traffic packets arriving at the port enabled for voice VLAN. Thus, a rogue client that is also connected to the voice VLAN port does not deteriorate the voice traffic. Commands in this Chapter This chapter explains the following commands: voice vlan voice vlan (Interface) voice vlan data priority show voice vlan Voice VLAN Commands 757
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