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Intel
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NetStructure™ 480T Routing Switch User Guide
Be careful when configuring your VLANs within a single STPD.
Figure 9.2 illustrates an incorrect network configuration using a
single STPD.
The STP configuration disables the ability of the switches to
forward VLAN traffic.
Figure 9.2: Tag-based STP configuration -Incorrect
The tag-based network in Figure 9.2 has this 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
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