STP Configuration and Verification
By default, all Cisco Nexus switches are enabled for Rapid Per-VLAN Spanning Tree (Rapid-PVST/802.1w), which is backward compatible with Per-VLAN Spanning Tree (PVST/802.1D) for interoperability and migration purposes. You can buy some Cisco switches and connect them with Ethernet cables in a redundant topology, and STP will ensure that frames do not loop. And you never even have to think about changing any settings.
This chapter focuses on only Rapid-PVST (802.1w). As mentioned earlier Cisco Nexus switches default to using Rapid-PVST, but to set a switch to use this mode, use the spanning-tree mode rapid-pvst global command. Alternatively, Cisco Nexus switches allow Multiple Spanning Tree (MST) with the
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