Mac Pinning Relative - Cisco Nexus 1000V Configuration Manual

For vmware vsphere

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Configuring Port Channels

MAC Pinning Relative

MAC pinning does not rely on any protocol to distinguish upstream switches so the configuration is independent

of upstream hardware or design.

In the case of a failure, the Cisco Nexus 1000V first sends a gratuitous ARP packet to the upstream switch

indicating that the VEM MAC address will now be learned on a different link. It also allows for subsecond

failover time.

The following figure shows each member port that is assigned to a specific port channel subgroup using MAC

pinning.

Figure 6: Using MAC Pinning to Connect a Port Channel to Multiple Upstream Switches

This feature modifies the existing algorithm for MAC pinning where the port channel uses the port number

(vmnic number) as the subgroup ID for an Ethernet member port.

The new algorithm assigns zero-based logical subgroup IDs to Ethernet member ports. The member port that

has the lowest port number (vmnic number) is assigned subgroup ID 0.

Cisco Nexus 1000V for VMware vSphere Interface Configuration Guide, Release 5.x

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