High Availability For Mst - Cisco Nexus 9000 Series Configuration Manual

Configuring MST Using Cisco NX-OS
BPDUs or Version 3 MST BPDUs on a boundary port. A boundary port connects to a LAN, the designated
device of which is either a single spanning tree device or a device with a different MST configuration.
MST interoperates with the Cisco prestandard MSTP whenever it receives prestandard MSTP on an MST
port; no explicit configuration is necessary.
You can also configure the interface to proactively send prestandard MSTP messages.

High Availability for MST

The software supports high availability for MST. However, the statistics and timers are not restored when
MST restarts. The timers start again and the statistics begin from 0.
The device supports full nondisruptive upgrades for MST. See the Cisco Nexus 9000 Series NX-OS High
Availability and Redundancy Guide, for complete information on nondisruptive upgrades and high-availability
features.
Licensing Requirements for MST
The following table shows the licensing requirements for this feature:
Product
Cisco NX-OS
Prerequisites for MST
MST has the following prerequisites:
• You must be logged onto the device.
Guidelines and Limitations for Configuring MST
Note When you change the VLAN-to-MSTI mapping, the system reconverges MST.
MST has the following configuration guidelines and limitations:
• For MST configuration limits, see the Cisco Nexus 9000 Series NX-OS Verified Scalability Guide.
• show commands with the internal keyword are not supported.
• You must enable MST; Rapid PVST+ is the default spanning tree mode.
Cisco Nexus 9000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
High Availability for MST
License Requirement
MST requires 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.
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