H3C Technologies H3C S10500 Series Switches - Manual (Page 48)

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NOTE:
•
To ensure stable aggregation state and service continuity, do not change port attributes or class-two
configurations on any member port.
• If a static aggregation group has reached the limit on Selected ports, any port that joins the group is
placed in the Unselected state to avoid traffic interruption on the current Selected ports. Avoid this
situation, however, because it might cause the aggregation state of a port to change after a reboot.
Aggregating links in dynamic mode
LACP is automatically enabled on all member ports in a dynamic aggregation group. The protocol
automatically maintains the aggregation state of ports.
The dynamic link aggregation process comprises:
• Selecting a reference port
• Setting the aggregation state of each member port
Selecting a reference port
The local system (the actor) and the remote system (the partner) negotiate a reference port using the
following workflow:
1. The systems compare the system ID (which comprises the system LACP priority and the system
MAC address). The system with the lower LACP priority value wins. If they are the same, the
systems compare the system MAC addresses. The system with the lower MAC address wins.
2. The system with the smaller system ID selects the port with the smallest port ID as the reference port.
A port ID comprises a port aggregation priority and a port number. The port with the lower
aggregation priority value wins. If two ports have the same aggregation priority, the system
compares their port numbers. The port with the smaller port number wins.
Setting the aggregation state of each member port
After the reference port is selected, the system with the lower system ID sets the state of each member port
in the dynamic aggregation group on its side.