Enterasys Networks 2H252, 2E253, 2H253, 2H258 manual 12-26VLAN Operation and Network Applications

Example 2, VLANs Across Multiple Switches

12.13.1 Solving the Problem

To solve the problem in this example, the users are assigned to VLANs using Switch 4 and Switch 2 as shown in Figure 12-12. Redco users are assigned to the Red VLAN and Blue Industries users to the Blue VLAN. The following information shows how Switch 4 and Switch 2 are configured to create the two VLANs to isolate the users of the two companies from one another on the network using the existing infrastructure.

Switch 4

Switch 4 is set as follows:

1.Two VLANs are added to the list of VLANs in the Static VLAN Configuration screen. An FDB ID is automatically assigned to each VLAN. In this example, the following VLANs are created:

•VLAN ID 2, FDB ID 2, with a VLAN Name of Red

•VLAN ID 3, FDB ID 3, with a VLAN Name of Blue

Because the VLANs are assigned to two separate FDB IDs, the users on VLAN ID 2 and VLAN ID 3 cannot communicate with each other.

2.The Egress type for both VLAN ID 2, Port 1, and VLAN ID 3, Port 3, are set to UNTAGGED using the Static VLAN Egress Configuration screen. This means that these ports will transmit only untagged VLAN frames.

3.Ports 1 and 3 are configured as follows using the VLAN Port Configuration screen:

•Port 1 is set as follows:

PVID: 2

Acceptable Frame Types: ADMIT ALL FRAMES

Ingress Filtering: ENABLED

GVRP Status: DISABLED

•Port 3 is set as follows:

PVID: 3

Acceptable Frame Types: ADMIT ALL FRAMES

Ingress Filtering: ENABLED

GVRP Status: DISABLED

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. This makes Port 1 part of the Red VLAN, Port 3 part of the Blue VLAN, and both are set to the VLAN frame format of untagged.

12-26VLAN Operation and Network Applications