Solving The Problem - Cabletron Systems DLE52-MA User Manual

Chapter 4: Examples
The Green, Inc. Network Administrators want to continue to separate
normal network traffic between the Blue and Red VLANs, and create a
new isolated VLAN for Green, Inc. users. All divisions in the facility are
to have equal access to the Mail Server on the first floor.
4.3.1

Solving the Problem

Much of the existing network configuration can remain as it was for
Example 2. While a new 1Q Trunk port must be activated and configured
on Switch 2, and the operational modes of the switches must be changed,
there are no other real changes to the network above the first floor.
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 to keep the VLANs isolated.
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.
Switch 2
Switch 2 is set as follows:
1. On the Port Filtering Configuration screen, the Filter Using Port
VLAN Lists is set to YES for ALL ports to keep the VLANs isolated.
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 are members
of FID 1.
3. The port mode of Port 4 is set using the Port Assignment screen:
• Port 4, Port Mode: 1Q Trunk
This causes Port 4 to be set as an additional 802.1Q Trunk port, which
makes its Port VLAN List contain all VLANs, and all frames
forwarded out this port are forwarded as tagged frames.
4-12 802.1Q VLAN User's Guide