Cisco Nexus 1000V Deployment Manual page 44

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However, this approach does not prevent the Cisco Nexus 1000V Switch from constructing a PortChannel on its

side, providing the required redundancy in the data center in the event of a failure. If a failure occurs, the Cisco

Nexus 1000V Switch will send a gratuitous ARP packet to alert the upstream switch that the MAC address of the

VEM learned on the previous link will now be learned on a different link, enabling failover in less than a second.

MAC address pinning enables consistent and easy deployment of the Cisco Nexus 1000V Switch because it does

not depend on any physical hardware or any upstream configuration, and it is the preferred method for deploying

the Cisco Nexus 1000V if the upstream switches cannot be clustered.

Figure 36.

MAC Address Pinning

vPC-HM Subgroups

vPC-HM subgroups provide another way of creating a PortChannel on the Cisco Nexus 1000V Switch side when

upstream switches cannot be clustered. With vPC-HM, the PortChannel configured on the Cisco Nexus 1000V

Switch is divided into subgroups, or logical, smaller PortChannels, with each subgroup representing one or more

uplinks to one upstream physical switch (Figure 37).

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