H3C Technologies H3C WX3000 Series Unified Switches - Manual (Page 131)

16-3
For an aggregation group:
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When the rate or duplex mode of a port in the aggregation group changes, packet loss may occur
on this port;
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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.
Static LACP Aggregation Group
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 automatically adding/removing ports to/from it).
Each static aggregation group must contain at least one port. When a static aggregation group contains
only one port, you cannot remove the port unless you remove the whole aggregation group.
LACP is enabled on the member ports of static aggregation groups. When you remove a static
aggregation group, all the member ports in up state form one or multiple dynamic aggregations with
LACP enabled. LACP cannot be disabled on static aggregation ports.
Port status of static aggregation group
A port in a static aggregation group can be in one of the two states: selected or unselected.
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Both the selected and the unselected ports can transceive LACP protocol packets.
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Only the selected ports can transceive service packets; the unselected ports cannot.
In a static aggregation group, the system sets the ports to selected or unselected state according to the
following rules.
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The system determines the master port with one of the following settings being the highest (in
descending order) as the master port: full duplex/high speed, full duplex/low speed, half
duplex/high speed, half duplex/low speed. The ports with their rate, duplex mode and link type
being the same as that of the master port are selected port.
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The ports connected to a peer device different from the one the master port is connected to or
those connected to the same peer device as the master port but to a peer port that is not in the
same aggregation group as the peer port of the master port are unselected ports.
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The ports unable to aggregate with the master port (due to some hardware limit) are unselected
ports.
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The system sets the ports with basic port configuration different from that of the master port to
unselected state.
There is a limit on the number of selected ports in an aggregation group. Therefore, if the number of the
selected ports in an aggregation group exceeds the maximum number supported by the device, those
with lower port numbers operate as the selected ports, and others as unselected ports.