Operation Manual – Link Aggregation
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1
Link Aggregation Configuration
1-3
The selected port with the smallest port number serves as the master port of the group,
and other selected ports serve as member ports of the group.
There is a limit on the number of selected ports in an aggregation group. Therefore, if
the number of the member ports serving as selected ports in an aggregation group
exceeds the maximum number supported by the device, the system will choose the
ports with lower port numbers as the selected ports, and set others as unselected ports.
In a manual aggregation group, the system sets the ports to selected or unselected
state by the following rules:
z The system sets the "most preferred" ports (that is, the ports take most
precedence over other ports) to selected state, and others to unselected state.
Port precedence descends in the following order: full duplex/high speed, full
duplex/low speed, half duplex/high speed, half duplex/low speed.
z The system sets the ports unable to aggregate with the master port (due to some
hardware limit, for example, cross-board aggregation unavailability) to unselected
state.
z The system sets the ports with port attribute configuration (rate, duplex mode, and
link type) different from that of the master port to unselected state.
III. Requirements on ports for manual aggregation
Generally, there is no limit on the rate and duplex mode of the ports (also including
initially DOWN port) you want to add to a manual aggregation group. After aggregation,
the smallest-numbered selected port is the master port of the aggregation group and
the other selected ports are the member ports of the aggregation group.
Note:
For an aggregation group:
z When the rate or duplex mode of a port in the aggregation group changes, packet
loss may occur on this port;
z When the rate of a port decreases, if the port belongs to a manual or static LACP
aggregation group, the port will be switched to the unselected state; if the port
belongs to a dynamic LACP aggregation group, deaggregation will occur on the
port.
1.1.5 Static LACP Aggregation Group
I. Introduction to static LACP aggregation
A static LACP aggregation group is also manually created. All its member ports are
manually added and can be manually removed (it inhibits the system from
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