STP Configurations
93
Figure 17
Tag-based STP configuration
The tag-based network in Figure 17 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 Marketing, Sales & Engineering
Sales & Engineering
Switch 1 Switch 3
Switch 2
91_010
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