Cisco Nexus 1000V - Problems with the GUI Upgrade

The following figure shows each member port that is assigned to a specific port channel subgroup using MAC
pinning relative.
Figure 7: Using MAC Pinning Relative to Connect a Port Channel to Multiple Upstream Switches
Network State Tracking for vPC-HM
Network state tracking for vPC-HM identifies link failures where other detection methods fail, and verifies
Layer 2 connectivity between vPC-HM channel subgroups. It is not intended to detect network configuration
problems.
Network state tracking selects one uplink interface in each sub group for broadcasting packets to a tracking
VLAN. The tracking VLAN is usually the lowest forwarding VLAN for trunk ports and the primary VLAN
for promiscuous access ports. The packets that are received back from the network on each subgroup are
tracked as are the number of consecutively missed broadcasts. If the missed broadcasts for a subgroup exceed
the threshold, the port channel is considered to be in split mode. In split mode, the interfaces are marked as
inactive, and traffic is pinned to active interfaces.
System messages indicate when a port channel enters or recovers from split mode; and interfaces are marked
active or inactive.
Cisco Nexus 1000V for VMware vSphere Interface Configuration Guide, Release 5.x
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Configuring Port Channels
Network State Tracking for vPC-HM