3Com 7757 Configuration Manual page 191

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Configuring a Dynamic
LACP Aggregation
Group
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For a static LACP aggregation group or a manual aggregation group, you are
recommended not to cross cables between the two devices at the two ends of the
aggregation group. For example, suppose port 1 of the local device is connected
to port 2 of the peer device. To avoid cross-connecting cables, do not connect port
2 of the local device to port 1 of the peer device. Otherwise, packets may be lost.
Note that:
LACP cannot be enabled on an existing port in a manual aggregation group.
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You can add a LACP-enabled port to a manual aggregation group. In this case,
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the system will disable LACP on the port automatically. Similarly, when you add
a LACP-disabled port to a static aggregation group, the system will enable
LACP on the port automatically.
A dynamic LACP aggregation group is automatically created by the system based
on LACP-enabled ports. The adding and removing of ports to/from a dynamic
aggregation group are automatically accomplished by LACP.
You need to enable LACP on the ports whom you want to participate in dynamic
aggregation of the system, because, only when LACP is enabled on those ports at
both ends, can the two parties reach agreement in adding/removing ports to/from
dynamic aggregation groups.
Enabling LACP on a member port of a manual aggregation group will not take
effect.
Table 124 Configure a dynamic LACP aggregation group
Operation
Enter system view
Configure a description for an
aggregation group
Configure the system priority
Enter Ethernet port view
Enable LACP on the port
Configure the port priority
If an existing aggregation group contains no port, the type of the aggregation
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group is set to the latest set type.
If an aggregation group contains ports, you can only change a dynamic
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aggregation group or static aggregation group into a manual aggregation
group, or change a dynamic aggregation group into a static aggregation
group.
Link Aggregation Configuration
Command
system-view
link-aggregation group
agg-id description agg-name
lacp system-priority
system-priority
interface interface-type
interface-number
lacp enable
lacp port-priority
port-priority
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Description
-
Optional
By default, an aggregation
group has no description.
Optional
By default, the system priority
is 32,768.
-
Required
By default, LACP is disabled
on a port.
Optional
By default, the port priority is
32,768.