Extreme Networks ExtremeWare XOS 11.1, Руководство пользователя

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Spanning Tree Protocol
ExtremeWare XOS 11.1 Concepts Guide
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STP Configurations
When you assign VLANs to an STPD, pay careful attention to the STP configuration and its effect on
the forwarding of VLAN traffic.
This section describes three types of STP configurations:
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Basic STP
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Multiple STPDs on a single port (which uses EMISTP)
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A VLAN that spans multiple STPDs
Basic STP Configuration
This section describes a basic, 802.1D STP configuration. Figure 27 illustrates a network that uses VLAN
tagging for trunk connections. The following four VLANs have been defined:
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Sales is defined on switch A, switch B, and switch M.
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Personnel is defined on switch A, switch B, and switch M.
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Manufacturing is defined on switch Y, switch Z, and switch M
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Engineering is defined on switch Y, switch Z, and switch M.
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Marketing is defined on all switches (switch A, switch B, switch Y, switch Z, and switch M).
Two STPDs are defined:
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STPD1 contains VLANs Sales and Personnel.
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STPD2 contains VLANs Manufacturing and Engineering.
The carrier and protected VLANs are also defined:
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Sales is the carrier VLAN on STPD1 .
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Personnel is a protected VLAN on STPD1 .
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Manufacturing is a protected VLAN on STPD2 .
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Engineering is the carrier VLAN on STPD2 .
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Marketing is a member of both STPD1 and STPD2 and is a protected VLAN.