User`s guide

Chapter 4: Examples
4-14 DIGITAL MultiSwitch 700 Port Based VLAN User’s Guide
3. One VLAN is added to the list of VLANs in the Device/VLAN
Configuration screen. In this example is set as follows:
VLAN ID 224 with a VLAN Name of Green
4. A Port VLAN ID is assigned to the switch ports as follows using the
Port Assignment screen:
Port 1, VLAN ID: 224 for the Green VLAN
Port 2, Port Mode: 1Q Trunk
Port 3, Port Mode: 1d Trunk
These settings change the configuration of the switch, so that port 1 is
part of the Green VLAN and is set to transmit a frame type of
untagged. Port 2 is set as an 802.1Q Trunk port, which makes the port
Egress List contain all VLANs and sets all frames forwarded out this
port to be tagged frames. Port 3 is set as a 1d Trunk port, where frames
classified as belonging to any VLAN are forwarded untagged, and
received frames are classified as belonging to the Default VLAN.
4.3.2 Frame Handling
The following describes how, when User B attempts to contact the Mail
Server on Switch 1, the frames are classified on Switch 4 and traverse the
network.
1. User B sends a broadcast frame in an attempt to contact the Mail
Server. The frame enters Bridge 1 and, being a broadcast, is forwarded
to all ports. Bridge 1 learns User B’s MAC address from the Source
Address field of the frame and adds it to its Source Address Table.
2. Switch 4 receives the frame and classifies this new untagged frame as
belonging to the Red VLAN. Since the frame is a broadcast, it is
forwarded to any ports that are classified as eligible to receive Red
VLAN frames. Switch 4 also updates its Source Address Table,
identifying User B and being located out port 1.