User guide

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8-5
STP C
ONFIGURATIONS
Figure 8-2: Tag-based STP configuration
The tag-based network in Figure 8-2 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
Switch 1 Switch 3
Switch 2
Sales & Engineering
EW_012