Allied Telesis SwitchBlade x3100 Series Manual page 393

Example (R)STP Configuration - Standard VLAN
To prevent one of the systems from becoming the Spanning Tree root bridge, the network design must ensure that the
appropriate STP parameters are set such that the root bridge is always located above the ring configuration.
4.5.5 Configuring (R)STP
4.5.6 Default STP Configuration (Customer and Network Ports)
By default the SBx3112 series product has the following STP set-up:
There is one STP instance that cannot be destroyed. Its name is "MAIN" and its initial state is disabled.
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By default all ports will belong to the default STP.
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Interfaces have the DIRECTION attribute that can be NETWORK or CUSTOMER. Usually, the user does not
want interfaces with a direction of CUSTOMER to participate in STP.
The CUSTOMER-direction interfaces default is not to be included (i.e. STP is disabled for those interfaces).
4.5.7 Configuration Procedure
The SBx3112 is a designated bridge in the network shown in
Interfaces 0.20, 0.21, 1.2, 1.3, and 11.0 serve as designated ports. Interface 0.0 serves as an alternate port.
Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)
Figure 4-5. Interface 0.22 serves as the root port.
Introduction
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