28. Spanning Tree
ROX™ v2.2 User Guide 306 RuggedBackbone™ RX1500
1. Configure and enable RSTP (see Section 28.4.1, “Spanning Tree Parameters” and Section 28.4.2,
“Port RSTP Parameters”). Note that the Max Hops parameter in the Bridge RSTP Parameters menu
is the maximum hop count for MSTP.
2. Create the VLANs that will be mapped to MSTIs (see the sections on VLAN Configuration).
3. Map VLANs to MSTIs (via the VLAN Configuration menus). Note that MSTP need not be enabled
in order to map a VLAN to an MSTI. Note also that this mapping must be identical for each bridge
that is to belong to the MST region.
4. Configure a Region Identifier and Revision Level. Note that these two items must be identical for
each bridge in the MST region .
5. Configure Bridge Priority per MSTI .
6. Configure Port Cost and Priority per port and per MSTI (see Section 28.4.4, “Port MSTI
Parameters”).
7. Enable MSTP (see Section 28.4.1, “Spanning Tree Parameters”).
Static VLANs must be used in an MSTP configuration. GVRP is not supported in this case.
28.3. RSTP Applications
28.3.1. RSTP in Structured Wiring Configurations
RSTP allows you to construct structured wiring systems in which connectivity is maintained in the event
of link failures. For example, a single link failure of any of links A through N in Figure 28.3, “Example
of a Structured Wiring Configuration”, would leave all the ports of bridges 555 through 888 connected
to the network.
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