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7-9
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 7 Configuring vPCs
Information About vPCs
Figure 7-8 vPC Peer Configurations That Are Not Allowed
To make a valid configuration, you first configure a port channel on each device and then configure the
vPC domain. You assign the port channel on each device as a peer link, using the same vPC domain ID.
For redundancy, we recommend that you should configure at least two of the dedicated ports into the
port channel because if one of the interfaces in the vPC peer link fails, the device automatically falls
back to use another interface in the peer link.
Note We recommend that you configure the Layer 2 port channels in trunk mode.
Many operational parameters and configuration parameters must be the same in each device connected
by a vPC peer link (see the “Compatibility Parameters for vPC Interfaces” section on page 7-15).
Because each device is completely independent on the management plane, you must ensure that the
devices are compatible on the critical parameters. vPC peer devices have separate control planes. After
configuring the vPC peer link, you should display the configuration on each vPC peer device to ensure
that the configurations are compatible.
Note You must ensure that the two devices connected by the vPC peer link have certain identical operational
and configuration parameters. For more information on required configuration consistency, see the
“Compatibility Parameters for vPC Interfaces” section on page 7-15.
When you configure the vPC peer link, the vPC peer devices negotiate that one of the connected devices
is the primary device and the other connected device is the secondary device (see the “Configuring
vPCs” section on page 7-30). The Cisco NX-OS software uses the lowest MAC address to elect the
primary device. The software takes different actions on each device—that is, the primary and
secondary—only in certain failover conditions. If the primary device fails, the secondary device
becomes the new primary device when the system recovers, and the previously primary device is now
the secondary device.
You can also configure which of the vPC devices is the primary device. Changing the priority of the vPC
peer devices can cause the interfaces in your network to go up and down. If you want to configure the
role priority again to make one vPC device the primary device, configure the role priority on both the
primary vPC device with a lower priority value, and secondary vPC device with the higher value. Then,
shut down the port channel that is the vPC peer link on both devices by entering the shutdown
command, and finally reenable the port channel on both devices by enter the no shutdown command.
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