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IEEE 802.1Q VLAN Example Configuration

This example demonstrates several scenarios of VLAN use and describes how the switch handles tagged and untagged traffic.

In this example, you create two new VLANS, you change the port membership for default VLAN 1, and you assign port members to the two new VLANs:

  1. In the Basic VLAN Configuration screen (see Basic-VLAN Configuration), create the following VLANs:
    • A VLAN with VID 10.
    • A VLAN with VID 20.
  2. In the VLAN Membership screen (see Advanced-VLAN Membership) specify the VLAN membership as follows:
    • For the default VLAN with VID 1, specify the following members: port 7 (U) and
      port 8 (U).
    • For the VLAN with VID 10, specify the following members: port 1 (U), port 2 (U), and port 3 (T).
    • For the VLAN with VID 20, specify the following members: port 4 (U), port 5 (T), and port 6 (U).
  3. With the VLAN configuration that you set up, the following situations produce results as described:
    • If an untagged packet enters port 1, the switch tags it with VID 10. The packet has access to port 2 and port 3. The outgoing packet is stripped of its tag to leave port 2 as an untagged packet. For port 3, the outgoing packet leaves as a tagged packet with VID 10.
    • If a tagged packet with VID 10 enters port 3, the packet has access to port 1 and port 2. If the packet leaves port 1 or port 2, it is stripped of its tag to leave the switch as an untagged packet.
    • If an untagged packet enters port 4, the switch tags it with VID 20. The packet has access to port 5 and port 6. The outgoing packet is stripped of its tag to become an untagged packet as it leaves port 6. For port 5, the outgoing packet leaves as a tagged packet with VID 20.

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