Operation Manual – Link Aggregation
H3C S5600 Series Ethernet Switches
Chapter 1 Link Aggregation Configuration
1-4
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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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Among the ports in an aggregation group that are in up state, 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,
and the rest are unselected ports.
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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 system sets the ports with basic port configuration different from that of the
master port to unselected state.
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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.
1.2.3 Dynamic LACP Aggregation Group
I. Introduction to dynamic LACP aggregation group
A dynamic LACP aggregation group is automatically created and removed by the
system. Users cannot add/remove ports to/from it. Ports can be aggregated into a
dynamic aggregation group only when they are connected to the same peer device and
have the same speed, duplex mode, and basic configurations, and so are/do their peer
ports.
Besides multiple-port aggregation groups, the system is also able to create single-port
aggregation groups, each of which contains only one port. LACP is enabled on the
member ports of dynamic aggregation groups.
II. Port status of dynamic aggregation group
A port in a dynamic aggregation group can be in one of the two states: selected and
unselected.
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Both the selected and the unselected ports can receive/transmit LACP protocol
packets;
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The selected ports can receive/transmit user service packets, but the unselected
ports cannot.