N
ETWORK
P
LANNING
2-5
Making VLAN Connections
VLANs can be based on port groups, or each data frame can be explicitly
tagged to identify the VLAN group it belongs to. When using port-based
VLANs, ports can either be assigned to any number of groups. Port-based
VLANs are suitable for small networks. A single switch can be easily
configured to support several VLAN groups for various organizational
entities (such as Finance and Marketing).
When you expand port-based VLANs across several switches, you need to
make a separate connection for each VLAN group. This approach is,
however, inconsistent with the Spanning Tree Protocol, which can easily
segregate ports that belong to the same VLAN. When VLANs cross
separate switches, it is therefore better to use VLAN tagging. This allows
you to assign multiple VLAN groups to the “trunk” ports (that is, tagged
ports) connecting different switches.
Figure 2-4. Making VLAN Connections
Note:
When connecting to a switch that does not support IEEE 802.1Q
VLAN tags, use untagged ports.
Finance
Marketing
VLAN 3
Untagged Ports
VLAN
unaware
switch
Tagged Port
VLAN
aware
switch
Tagged
Ports
Finance
VLAN 3
R&D
VLAN 1
VLAN 2
Testing
R&D
Testing
VLAN 1
VLAN 2
VLAN 4
1
Status
Activity
Summary of Contents for 6924MT
Page 2: ......
Page 12: ...COMPLIANCES viii ...
Page 16: ...TABLE OF CONTENTS xii ...
Page 30: ...ABOUT THE TIGERSTACK 100 1 14 ...
Page 56: ...MAKING NETWORK CONNECTIONS 4 8 ...
Page 74: ...ORDERING INFORMATION D 2 ...
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