Dell Networking N4000 Series Configuration Manual page 733

Stackable layer 2 and 3 switches

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The MSTP domain contains the root bridge for ALL VLANs. This implies

that the CIST Root Bridge ID is configured to be better than any RSTP-

PV STP root Bridge ID. If there is only one MSTP region connected to the

RSTP-PV domain, then all boundary ports on the virtual-bridge will be

unblocked and used by RSTP-PV. This is the only supported topology, as

the administrator can manipulate uplink costs on the RSTP-PV side and

obtain optimal traffic engineering results. In Figure 22-8, VLANs 2 and 3

have their STP costs configured to select different uplinks connected to

the MSTP region's boundary ports. Since the CIST Root is inside the

MSTP region, both boundary ports are non-blocking designated and the

load balancing scheme operates as expected.

Figure 22-8. MSTP and RSTP-PV Interoperability

PVST+ Bridge

Configuring the Spanning Tree Protocol

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