3Com 3c17300 Implementation Guide - Page 66

Communication Between VLANs, Creating New VLANs, VLANs: Tagged and Untagged Membership

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68 CHAPTER 8: SETTING UP VIRTUAL LANS All the ports are initially placed in this VLAN, and it is the only VLAN that allows you to access the management software of the Switch over the network. Communication Between VLANs If the devices placed in a VLAN need to communicate to devices in a different LAN, each VLAN requires a connection to a router or Layer 3 switching device. Communication between VLANs can only take place if they are all connected to a routing or Layer 3 switching device. Figure 19 Two VLANS connected via a router Creating New VLANs If you want to move a port from the Default VLAN to another VLAN, you must first define information about the new VLAN on your Switch. VLANs: Tagged and Untagged Membership Your Switch supports 802.1Q VLAN tagging, a system that allows traffic for multiple VLANs to be carried on a single physical (backbone) link. When setting up VLANs you need to understand when to use untagged and tagged membership of VLANs. Quite simply, if a port is in a single VLAN it can be an untagged member but if the port needs to be a member of multiple VLANs tagged membership must be defined. Typically endstations (for example, clients or servers) will be untagged members of one VLAN, while inter-Switch connections will be tagged members of all VLANs.

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68
C
HAPTER
8: S
ETTING
U
P
V
IRTUAL
LAN
S
All the ports are initially placed in this VLAN, and it is the only VLAN that
allows you to access the management software of the Switch over the
network.
Communication
Between VLANs
If the devices placed in a VLAN need to communicate to devices in a
different LAN, each VLAN requires a connection to a router or Layer 3
switching device. Communication between VLANs can only take place if
they are all connected to a routing or Layer 3 switching device.
Figure 19
Two VLANS connected via a router
Creating New VLANs
If you want to move a port from the Default VLAN to another VLAN, you
must first define information about the new VLAN on your Switch.
VLANs: Tagged and
Untagged
Membership
Your Switch supports 802.1Q VLAN tagging, a system that allows traffic
for multiple VLANs to be carried on a single physical (backbone) link.
When setting up VLANs you need to understand when to use untagged
and tagged membership of VLANs. Quite simply, if a port is in a single
VLAN it can be an untagged member but if the port needs to be a
member of multiple VLANs tagged membership must be defined.
Typically endstations (for example, clients or servers) will be untagged
members of one VLAN, while inter-Switch connections will be tagged
members of all VLANs.