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174CHAPTER 13: CONFIGURING QUALITY OF SERVICE
Defining Voice | Voice VLAN allows network administrators to enhance VoIP service by |
VLAN | configuring ports to carry IP voice traffic from IP phones on a specific |
| VLAN. VoIP traffic has a preconfigured OUI prefix in the source MAC |
| address. Network Administrators can configure VLANs on which voice IP |
| traffic is forwarded. |
| auto Voice VLAN secure mode. Voice VLAN also provides QoS to VoIP, |
| ensuring that the quality of voice does not deteriorate if the IP traffic is |
| received unevenly. The system supports one Voice VLAN. |
| There are two operational modes for IP Phones: |
| ■ IP phones are configured with |
| tagged packets are used for all communications. |
| ■ If the IP phone’s |
| packets. The phone uses untagged packets while retrieving the initial |
| IP address through DHCP. The phone eventually use the Voice VLAN |
| and start sending tagged packets. |
This section contains the following topics:
■Viewing Voice VLANs
■Defining Voice VLAN
■Defining Voice VLAN Port Settings
■Viewing Voice VLAN Port Definitions
■Viewing the OUI Summaries
■Modifying OUI Definitions