Dynamic Addresses; Voice Vlan-Autodetection Device - Nortel BES50GE-12T PWR User Manual

150 BES50 advanced features fundamentals

Dynamic addresses

The dynamic address table contains the MAC addresses learned by
monitoring the source address for traffic entering the switch. When the
destination address for inbound traffic is found in the database, the packets
intended for that address are forwarded directly to the associated port.
Otherwise, the traffic is flooded to all ports.
Voice VLAN—autodetection device
Voice VLAN is designed for users' voice flow, and it distributes different
port precedence in different cases.
The system uses the source MAC address of the traffic traveling through
the port to identify the IP Phone data flow. You can either preset an OUI
address or adopt the default OUI address as the standard. Here, the OUI
address refers to that of a vendor.
Voice VLAN can be configured either manually or automatically. In auto
mode, the system learns the source MAC address and automatically adds
the ports to a voice VLAN by using the untagged packets sent out when the
IP Phone is powered on; in manual mode, however, you must add ports to a
voice VLAN manually. Both of the modes forward the tagged packets sent
by the IP Phone without learning the address.
Because there are multiple types of IP Phones, you must ensure that the
mode on a port matches the IP Phone.
Correspondence between port mode and IP Phone
Voice VLAN mode
Auto Mode
Copyright © 2006, Nortel Networks
.
Type of IP Phone
Tagged IP Phone
Untagged IP Phone
SMB
Using the Nortel Business Ethernet Switch 50 Series
NN47924-301 01.01 Standard
1.00 October 2006
Port mode
Access: Not supported
Trunk: Supported, but the default VLAN of the
connected port must exist and cannot be the
voice VLAN. The default VLAN is allowed to
pass the connected port.
Hybrid: Supported, but the default VLAN of the
connected port must exist and must be in the
tagged VLAN list that is allowed to pass the
connected port.
Access, Trunk, and Hybrid: Not supported
because the default VLAN of the connected port
must be the voice VLAN, and the connected
port belongs to the voice VLAN; and you must
add the port to the voice VLAN manually.
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