H3C Technologies H3C S12500-X Series Switches - Manual (Page 49)

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Figure 8 Setting the aggregation state of a member port in a static aggregation group
The maximum number of Selected ports in a static aggregation group is 16.
To ensure stable aggregation state and service continuity, do not change port attributes or class-two
configurations on any member port. If you need to make this change, make sure you understand its
impact on the live network. Any port attribute or class-two configuration change might affect the
aggregation state of link aggregation member ports and ongoing traffic.
Aggregating links in dynamic mode
Dynamic aggregation mode is implemented through IEEE 802.3ad Link Aggregation Control Protocol
(LACP).
LACP
LACP uses LACPDUs to exchange aggregation information between LACP-enabled devices.
Each member port in an LACP-enabled aggregation group exchanges information with its peer. When a
member port receives an LACPDU, it compares the received information with information received on the
other member ports. In this way, the two systems reach an agreement on which ports are placed in
Selected state.