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Chapter 4: Examples
Switch 4
Switch 4 is set as follows:
1. On the Port Filtering Configuration screen, the Filter Using Port
VLAN Lists is set to YES for ALL ports. This prevents tagged frames
from being forwarded according to each Port VLAN List, preventing
users on the Red VLAN from communicating with users on the Blue
VLAN. If a frame is received that is not on a port's Port VLAN List,
the frame is dropped.
2. Two VLANs are added to the list of VLANs in the Device/VLAN
Configuration screen and assigned to a FID. In this example they are
as follows:
•
VLAN ID 222, FID 2, with a VLAN Name of Red
•
VLAN ID 223, FID 3, with a VLAN Name of Blue
3. A Port VLAN ID (PVID) is assigned to each port (1, 3, and 4) as
follows using the Port Assignment Configuration screen:
•
Port 1, VLAN ID: 222 for the Red VLAN
•
Port 3, VLAN ID: 223 for the Blue VLAN
•
Port 4, Port Mode: 1Q Trunk
This causes the switch to classify all untagged frames received as
belonging to the VLAN specified by each port PVID and to replace the
previous PVID information in the port VLAN List with the new PVID
information, so that Port 1 is part of the Red VLAN, Port 3 is part of
the Blue VLAN, and both are set as VLAN frame format of untagged.
Port 4 is set as an 802.1Q Trunk port, which makes the port eligible to
transmit to all VLANs, and all frames forwarded out this port are
forwarded as tagged frames. With the original classification
information inserted in the frame Tag Header the receiving switch will
maintain the original frame classification.
4-6
802.1Q VLAN User's Guide
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