Introduction 19The PowerConnect 35xx series systems enhances auto negotiation by providing port advertisement.Port advertisement allows the system administrator to configure the port speeds that are advertised.For more information on auto-negotiation, see "Defining Port Configuration" or "Defining LAG Parameters."Voice VLANVoice VLAN allows network administrators to enhance VoIP service by configuring ports to carry IP voicetraffic from IP phones on a specific VLAN. VoIP traffic has a preconfigured OUI prefix in the sourceMAC address. Network Administrators can configure VLANs from which voice IP traffic is forwarded.Non-VoIP traffic is dropped from the Voice VLAN in auto Voice VLAN secure mode. Voice VLAN alsoprovides QoS to VoIP, ensuring that the quality of voice does not deteriorate if the IP traffic is receivedunevenly.For more information, see "Configuring Voice VLAN" on page 374.Guest VLANGuest VLAN provides limited network access to unauthorized ports. If a port is denied network accessvia port-based authorization, but the Guest VLAN is enabled, the port receives limited network access.MAC Address Supported FeaturesMAC Address Capacity SupportThe device supports up to 8K MAC addresses. The device reserves specific MAC addresses for systemuse.Static MAC EntriesMAC entries can be manually entered in the Bridging Table, as an alternative to learning them fromincoming frames. These user-defined entries are not subject to aging, and are preserved across resetsand reboots.For more information, see "Defining Static Addresses."Self-Learning MAC AddressesThe device enables controlled MAC address learning from incoming packets. The MAC addresses arestored in the Bridging Table.Automatic Aging for MAC AddressesMAC addresses, from which no traffic is received for a given period, are aged out. This prevents theBridging Table from overflowing.For more information on configuring the MAC Address Age Out Time, see "Viewing Dynamic Addresses."
