HP FlexFabric 12900 Series Configuration Manual page 50

The local system (the actor) and the remote system (the partner) negotiate a reference port by using the
following workflow:
1. Compare the system IDs. (A system ID contains the system LACP priority and the system MAC
address.) The lower the LACP priority, the smaller the system ID. If LACP priority values are the
same, the two systems compare their MAC addresses. The lower the MAC address, the smaller the
system ID.
2. The system with the smaller system ID chooses the port with the smallest port ID as the reference
port. (A port ID contains a port priority and a port number.) The port with the lower priority value
is chosen. If two ports have the same aggregation priority, the system compares their port numbers.
The port with the smaller port number and the same attribute configurations as the aggregate
interface becomes the reference port.
Setting the aggregation state of each member port
After the reference port is chosen, the system with the lower system ID sets the state of each member port
in the dynamic aggregation group on its side as shown in Figure 10.
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