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STP Configurations
STP Configurations
Sales, Personnel, Marketing
Switch A
Switch B
6-4
When you assign VLANs to an STPD, pay careful attention to the STP
configuration and its effect on the forwarding of VLAN traffic.
Figure 6-1
illustrates a network that uses VLAN tagging for trunk
connections. The following four VLANs have been defined:
Sales is defined on Switch A, Switch B, and Switch M.
Personnel is defined on Switch A, Switch B, and Switch M.
Manufacturing is defined on Switch Y, Switch Z, and Switch M.
Engineering is defined on Switch Y, Switch Z, and Switch M.
Marketing is defined on all switches (Switch A, Switch B, Switch
Y, Switch Z, and Switch M).
Two STPDs are defined:
STPD1 contains VLANs Sales and Personnel.
STPD2 contains VLANs Manufacturing and Engineering.
The VLAN Marketing is a member of the default STPD, bu t not
assigned to either STPD1 or STPD2.
Centre COM
Centre COM
STPD 1
Sales, Personnel, Manufacturing, Engineering, Marketing
Figure 6-1 Multiple Spanning Tree Domains
Manufacturing, Engineering, Marketing
STPD 2
Switch M
Centre COM
Centre COM
Switch Y
Centre COM
Switch Z
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