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7-16
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 7 Configuring vPCs
Information About vPCs
This section includes the following sections:
• Configuration Parameters That Must Be Identical, page 7-16
• Configuration Parameters That Should Be Identical, page 7-17
• Consequences of Parameter Mismatch, page 7-18
Configuration Parameters That Must Be Identical
The configuration parameters in this section must be configured identically on both devices of the vPC
peer link; otherwise, the vPC moves fully or partially into a suspended mode.
Caution When spanning tree is disabled for any VLANs irrespective of whether it is a VPC VLAN or not, it will
cause a Global type 1 inconsistency causing all VPCs VLANs to be suspended. This issue is also
observed when disabling spanning tree for a non-existent VLAN.
Note You must ensure that all interfaces in the vPC have the identical operational and configuration
parameters listed below.
Note Enter the show vpc consistency-parameters command to display the configured values on all interfaces
in the vPC. The displayed configurations are only those configurations that would limit the vPC peer
link and vPC from coming up.
The devices automatically check for compatibility for some of these parameters on the vPC interfaces.
The per-interface parameters must be consistent per interface, and the global parameters must be
consistent globally:
• Port-channel mode: on, off, or active
• Link speed per channel
• Duplex mode per channel
• Trunk mode per channel:
–
Native VLAN
–
VLANs allowed on trunk
–
Tagging of native VLAN traffic
• Spanning Tree Protocol (STP) mode
• STP region configuration for Multiple Spanning Tree
• Enable/disable state per VLAN
• STP global settings:
–
Bridge Assurance setting
–
Port type setting
–
Loop Guard settings
• STP interface settings:
–
Port type setting
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