Cisco Nexus 5000 Series Switch CLI Software Configuration Guide (OL-16597-01, July 2009)

default VRF, an SVI must be created to act as the source and destination addresses for the vPC peer-keepalive
messages. Ensure that both the source and destination IP addresses used for the peer-keepalive messages are
unique in your network and these IP addresses are reachable from the VRF associated with the vPC
peer-keepalive link.
We recommend that you configure the vPC peer-keepalive link on the Cisco Nexus 5000 Series switch
to run in the management VRF using the mgmt 0 interfaces. If you configure the default VRF, ensure that
the vPC peer link is not used to carry the vPC peer-keepalive messages.
Note
Compatibility Parameters for vPC Peer Links
Many configuration and operational parameters must be identical on all interfaces in the vPC. After you enable
the vPC feature and configure the peer link on both vPC peer switches, Cisco Fabric Services (CFS) messages
provide a copy of the configuration on the local vPC peer switch configuration to the remote vPC peer switch.
The system then determines whether any of the crucial configuration parameters differ on the two switches.
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 compatibility check process for vPCs differs from the compatibility check for regular EtherChannels.
Configuration Parameters That Must Be Identical
The configuration parameters in this section must be configured identically on both switches at either end of
the vPC peer link or the vPC is moved into suspend mode.
You must ensure that all interfaces in the vPC have the identical operational and configuration parameters
listed in this section.
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.
Note
The switch automatically check for compatibility 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
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
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Information About vPCs
Compatibility Parameters for vPC Peer Links