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Link aggregation modes
An aggregation group operates in one of the following modes:
• Static—Static aggregation is stable. An aggregation group in static mode is called a static
aggregation group. The aggregation states of the member ports in a static aggregation group
are not affected by the peer ports.
• Dynamic—An aggregation group in dynamic mode is called a dynamic aggregation group.
Dynamic aggregation is implemented through IEEE 802.3ad Link Aggregation Control Protocol
(LACP). The local system and the peer system automatically maintain the aggregation states of
the member ports. Dynamic link aggregation reduces the administrators' workload.
How static link aggregation works
Reference port selection process
When setting the aggregation states of the ports in an aggregation group, the system automatically
chooses a member port as the reference port. A Selected port must have the same operational key
and attribute configurations as the reference port.
The system chooses a reference port from the member ports in up state.
The candidate reference ports are organized into different priority levels following these rules:
1. In descending order of port priority.
2. Full duplex.
3. In descending order of speed.
4. Half duplex.
5. In descending order of speed.
From the candidate ports with the same attribute configurations as the aggregate interface, the one
with the highest priority level is chosen as the reference port.
• If multiple ports have the same priority level, the port that has been Selected (if any) is chosen.
If multiple ports with the same priority level have been Selected, the one with the smallest port
number is chosen.
• If multiple ports have the same priority level and none of them has been Selected, the port with
the smallest port number is chosen.
Setting the aggregation state of each member port
After the reference port is chosen, the system sets the aggregation state of each member port in the
static aggregation group.
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