Operation Manual – Link Aggregation
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1
Link Aggregation Configuration
1-6
III. Configuring system priority
LACP determines the selected and unselected states of the dynamic aggregation
group members according to the priority of the port ID on the end with the preferred
device ID.
The device ID consists of two-byte system priority and six-byte system MAC address,
that is, device ID = system priority + system MAC address.
When two device IDs are compared, the system priorities are compared first, and the
system MAC addresses are compared when the system priorities are the same. The
device with smaller device ID will be considered as the preferred one.
Note:
Changing the system priority of a device may change the preferred device between the
two parties, and may further change the states (selected or unselected) of the member
ports of dynamic aggregation groups.
IV. Configuring port priority
LACP determines the selected and unselected states of the dynamic aggregation
group members according to the port IDs on the device with the preferred device ID.
When the number of members in an aggregation group exceeds the number of
selected ports supported by the device in each group, LACP determines the selected
and unselected states of the ports according to the port IDs. The ports with superior
port IDs will be set to selected state and the ports with inferior port IDs will be set to
unselected state.
The port ID consists of two-byte port priority and two-byte port number, that is, port ID =
port priority + port number. When two port IDs are compared, the port priorities are
compared first, and the port numbers are compared if the port priorities are the same.
The port with smaller port ID is considered as the preferred one.
1.1.7 Aggregation Group Categories
Depending on whether or not load sharing is implemented, aggregation groups can be
load-sharing or non-load-sharing aggregation groups. When load sharing is
implemented,
z For IP packets, the system will implement load-sharing based on source IP
address and destination IP address;
z For non-IP packets, the system will implement load-sharing based on source MAC
address and destination MAC address.
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