High Availability For Stp; Virtualization Support For Stp Extensions; Licensing Requirements For Stp Extensions - Cisco Nexus 7000 Series Configuration Manual

High Availability for STP

However, you may want to control the connection between MST and Rapid PVST+ to protect against
accidentally connecting an MST-enabled port to a port enabled to run Rapid PVST+. Because Rapid PVST+
is the default STP mode, you may encounter many Rapid PVST+ connections.
Disabling Rapid PVST+ simulation, which can be done globally for the entire device, moves the MST-enabled
port to the blocking state once it detects it is connected to a Rapid PVST+-enabled port. This port remains in
the inconsistent state until the port stops receiving Rapid PVST+/SSTP BPDUs, and then the port resumes
the normal STP transition process.
The root bridge for all STP instances must all be in either the MST region or the Rapid PVST+ side. If the
root bridge for all STP instances are not on one side or the other, the software moves the port into a PVST
simulation-inconsistent state.
We recommend that you put the root bridge for all STP instances in the MST region.
Note
High Availability for STP
The software supports high availability for STP. However, the statistics and timers are not restored when STP
restarts. The timers start again and the statistics begin from 0.
See the Cisco Nexus 7000 Series NX-OS High Availability and Redundancy Guide for complete information
Note
on high-availability features.

Virtualization Support for STP Extensions

The system provides support for virtual device contexts (VDCs), and each VDC runs a separate STP. You
can run Rapid PVST+ in one VDC and MST in another VDC.

Licensing Requirements for STP Extensions

The following table shows the licensing requirements for this feature:
Product
Cisco NX-OS
However, using VDCs requires an Advanced Services license.
Cisco Nexus 7000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.x
184
Configuring STP Extensions Using Cisco NX-OS
License Requirement
STP extensions require no license. Any feature not
included in a license package is bundled with the
Cisco NX-OS system images and is provided at no
extra charge to you. For a complete explanation of
the Cisco NX-OS licensing scheme, see Cisco NX-OS
Licensing Guide.