Cisco Nexus 7000 Design Manual page 40

FlexPod Implementation and Design
Provides a loop-free topology
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Uses all available uplink bandwidth
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Provides fast convergence if either one of the physical links or a device fails
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Provides link-level resiliency
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Helps ensure high availability of the overall FlexPod system
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vPC requires a "peer link", which is shown as port channel 10 in
do not mix, maintaining SAN A/B isolation best practices. The vPC links facing the Cisco UCS Fabric
Interconnects, Po 13 and Po14, do not carry any FCoE traffic. Make sure not to define any FCoE VLANs
on these links.
The vPC peer keepalive link is an important component of a vPC configuration. The peer keepalive link
allows each vPC enabled switch to monitor the health of its peer. This link accelerates convergence and
reduces the occurrence of split-brain scenarios. In this validated solution, the vPC peer keepalive link
uses the out-of-band management network. This link is not shown in
VMware vSphere 5.1 on FlexPod with Nexus 7000 Using FCoE
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Figure 18. It is crucial that the fabrics
Figure 18.