Stp Configurations - 3Com 9000 SX User Manual

7-6 C 7: S
HAPTER PANNING
STP Configurations
Sales, Personnel, Marketing
Switch A
Switch B
T P (STP)
REE ROTOCOL
When you assign VLANs to an STPD, pay careful attention to the STP
configuration and its effect on the forwarding of VLAN traffic.
Figure 7-4 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 not assigned to a STPD.
STPD 1
Sales, Personnel, Manufacturing, Engineering, Marketing
Figure 7-4 Multiple Spanning Tree Domains
Manufacturing, Engineering, Marketing
STPD 2
Switch M
Switch Y
Switch Z