Cisco Nexus 5000 Series Switch CLI Software Configuration Guide, NX-OS 4.0(1a)N1 (OL-16597-01, January 2009)

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9-10
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 9 Configuring MST
Configuring MST
• Specifying the MST Name, page 9-12
• Specifying the MST Configuration Revision Number, page 9-13
• Mapping and Unmapping VLANs to MST Instances, page 9-15
• Mapping Secondary VLANs to Same MSTI as Primary VLANs for Private VLANs, page 9-16
• Configuring the Root Bridge, page 9-16
• Configuring a Secondary Root Bridge, page 9-17
• Configuring the Port Priority, page 9-18
• Configuring the Port Cost, page 9-19
• Configuring the Switch Priority, page 9-20
• Configuring the Hello Time, page 9-21
• Configuring the Forwarding-Delay Time, page 9-22
• Configuring the Maximum-Aging Time, page 9-22
• Configuring the Maximum-Hop Count, page 9-22
• Configuring PVST Simulation Globally, page 9-23
• Configuring PVST Simulation Per Port, page 9-23
• Specifying the Link Type, page 9-24
• Restarting the Protocol, page 9-25
MST Configuration Guidelines
When configuring MST, follow these guidelines:
• When you work with private VLANs, enter the private-vlan synchronize command to map the
secondary VLANs to the same MST instance as the primary VLAN.
• When you are in the MST configuration submode, the following guidelines apply:
– Each command reference line creates its pending regional configuration.
– The pending region configuration starts with the current region configuration.
– To leave the MST configuration submode without committing any changes, enter the abort
command.
– To leave the MST configuration submode and commit all the changes that you made before you
left the submode, enter the exit command.
Enabling MST
You must enable MST; Rapid PVST+ is the default.
Note Changing the spanning tree mode disrupts traffic because all spanning tree instances are stopped for the
previous mode and started for the new mode.