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C H A P T E R 7
Marketing & Sales
Switch 1
Spanning Tree* Protocol (STP)
Switch 2
Sales & Engineering
Figure 13: Tag-based STP configuration
The tag-based network in Figure 13 has the following
configuration:
•
Switch 1 contains VLAN Marketing and VLAN Sales.
•
Switch 2 contains VLAN Engineering and VLAN Sales.
•
Switch 3 contains VLAN Marketing, VLAN Engineering, and
VLAN Sales.
•
The tagged trunk connections for three switches form a triangular
loop that is not permitted in an STP topology.
•
All VLANs in each switch are members of the same STPD.
STP may block traffic between Switch 1 and Switch 3 by disabling
the trunk ports for that connection on each switch.
Switch 2 has no ports assigned to VLAN marketing. Therefore, if
the trunk for VLAN marketing on Switches 1 and 3 is blocked, the
traffic for VLAN marketing will not be able to traverse the
switches.
Marketing, Sales & Engineering
Switch 3
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