3Com 3824 Implementation Guide - Page 68

Using 802.1Q Tagged Connections,

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68 CHAPTER 8: SETTING UP VIRTUAL LANS To set up the configuration shown in Figure 18: 1 Configure the VLANs Define VLAN 2 on the Switch. VLAN 1 is the default VLAN and already exists. 2 Add ports to the VLANs Add ports 10, 11 and 12 of the Switch as untagged members to VLAN 2. You can use the Switch Web Interface to change VLAN conguration. VLAN configuration can be found at Bridge > VLAN. Using 802.1Q Tagged Connections In a network where the VLANs are distributed amongst more than one Switch, you must use 802.1Q tagged connections so that all VLAN traffic can be passed along the links between the Switches. 802.1Q tagging can only be used if the devices at both ends of a link support IEEE 802.1Q. The example shown in Figure 19 illustrates two Switch units. Each Switch has endstations and a server in VLAN 1 and VLAN 2. All endstations in VLAN 1 need to be able to connect to the server in VLAN1 which is attached to Switch 1 and all endstations in VLAN 2 need to connect to the server in VLAN2 which is attached to Switch 2. Figure 19 VLAN configuration example: 802.1Q tagged connections

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68
C
HAPTER
8: S
ETTING
U
P
V
IRTUAL
LAN
S
To set up the configuration shown in
Figure 18
:
1
Configure the VLANs
Define VLAN 2 on the Switch. VLAN 1 is the default VLAN and already
exists.
2
Add ports to the VLANs
Add ports 10, 11 and 12 of the Switch as untagged members to VLAN 2.
You can use the Switch Web Interface to change VLAN conguration.
VLAN configuration can be found at Bridge > VLAN.
Using 802.1Q Tagged
Connections
In a network where the VLANs are distributed amongst more than one
Switch, you must use 802.1Q tagged connections so that all VLAN traffic
can be passed along the links between the Switches. 802.1Q tagging can
only be used if the devices at both ends of a link support IEEE 802.1Q.
The example shown in
Figure 19
illustrates two Switch units. Each Switch
has endstations and a server in VLAN 1 and VLAN 2. All endstations in
VLAN 1 need to be able to connect to the server in VLAN1 which is
attached to Switch 1 and all endstations in VLAN 2 need to connect to
the server in VLAN2 which is attached to Switch 2.
Figure 19
VLAN configuration example: 802.1Q tagged connections