User guide

194 ExtremeWare 7.2e Installation and User Guide
Spanning Tree Protocol (STP)
To display the configuration, use the following command:
show stpd {<spanning tree name> | detail}
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 two types of STP configurations:
• Basic STP
• A VLAN that spans multiple STPDs
Basic STP Configuration
This section describes a basic, 802.1D STP configuration. Figure 29 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 both STPD1 and STPD2.