Enterasys Networks 2200 - Manual (Page 301)

Example 4, Isolating Network Traffic According to Protocol
VLAN Operation and Network Applications 12-39
12.15.1 Solving the Problem
Much of the existing network configuration can remain as it was for Example 3, 1D Trunk
Connection to 802.1Q VLAN Network, described in the user’s guide. However, Switch 3, Switch
5, and the devices that will make up Publication’s Gray VLAN have been added.
Switch 5 will be configured to isolate all AppleTalk protocol frame traffic to the devices in the
Gray VLAN and all other protocol traffic to the Yellow VLAN. Switch 3 will link the traffic from
Switch 5 to the buildings network backbone.
Two 1Q Trunk ports must be activated and configured on Switch 3, and one 1Q Trunk port must be
activated and configured on Switch 4.
Ports 2, 3, 4, 5, 6, 7, and 8 of Switch 5 are connected to the Publication Department devices. These
ports will be configured to classify all AppleTalk frames into the AppleTalk VLAN (Gray). The
same ports will also be configured to classify all other protocol frames into a second VLAN
(Yellow). Port 1 will be assigned to the Yellow VLAN to handle the traffic between Switch 3 and
5.
Switch 3
Switch 3 is set as follows:
1. One VLAN is added to the list of VLANs in the Device VLAN Configuration screen. In this
example, Switch 3 is set as follows:
• VLAN ID 5, FID 5, with a VLAN Name of Yellow
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 3 using the Port Assignment screen, as follows:
• Port 3, VLAN ID: 5, FID 5
4. The port mode of Ports 2 and 4 are set using the Port Assignment screen:
• Port 2, Port Mode: 1Q Trunk
• Port 4, Port Mode: 1Q Trunk
Ports 2 and 4 are set as 802.1Q Trunk ports, which makes these ports eligible to transmit frames
of all VLANs, and sets all frames forwarded out these ports as tagged frames. This allows traffic
from Switch 4 to reach Switch 2 on the network backbone.