Example 3, 1D Trunk Connection to 802.1Q VLAN Network
2.The Forward Default VLAN Out All Ports is set to YES using the Device/VLAN Configuration screen. This adds the Default VLAN to the Port VLAN List of every switch port and all VLANs become members of FID 1.
3.A Port VLAN ID is assigned to Port 1 using the Port Assignment screen, as follows:
•Port 1, VLAN ID: 224 for the Green VLAN
This setting changes 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.
4.The port mode of Ports 2 and 3 are set using the Port Assignment screen:
•Port 2, Port Mode: 1Q Trunk
•Port 3, Port Mode: 1D Trunk
Port 2 is set as an 802.1Q Trunk port, which makes the port eligible to transmit frames of all VLANs, and sets all frames forwarded out this port as 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. This allows the Mail Server to send/receive mail traffic to/from all VLAN users on the network backbone,
4.3.2Frame 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 in FID 1.
802.1Q VLAN User’s Guide |
