3Com 5500-SI Configuration Manual page 73

port with static ARP configured
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port with 802.1x enabled.
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You must delete the aggregation group, instead of the port, if the manual or static
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LACP aggregation group contains only one port.
Setting/Deleting the Aggregation Group Descriptor
Perform the following configuration in System View.
Table 54 Setting/Deleting the Aggregation Group Descriptor
Operation
Set aggregation group descriptor
Delete aggregation group descriptor undo link-aggregation group agg_id
By default, an aggregation group has no descriptor.
If you have saved the current configuration with the
manual aggregation groups, static LACP aggregation groups and corresponding
descriptors exist when the system reboots. But the dynamic LACP aggregation groups
do not exist, and even the descriptors configured for them will not be restored.
Configuring System Priority
The LACP refers to system IDs in determining if the member ports are the selected or
standby port for a dynamic LACP aggregation group. The system ID consists of
two-byte system priority and six-byte system MAC, that is, system ID = system priority
+ system MAC. In comparing system IDs, the system first compares system priority
values; if they are equal, then it compares system MAC addresses. The smaller system
ID is given priority.
Changing system priority may affect the priority levels of member ports, and further
their selected or standby state.
Perform the following configuration in System View.
Table 55 Configuring System Priority
Operation
Configure system priority
Restore the default system priority
By default, system priority is 32768.
Configuring Port Priority
The LACP compares system IDs first and then port IDs (if system IDs are the same) in
determining if the member ports are selected or standby ports for a dynamic LACP
aggregation group. If the ports in an aggregation group exceed the port quantity
threshold for that group, the system shall set some ports with smaller port IDs as
selected ports and others as standby ports. The port ID consists of two-byte port
priority and two-byte port number, that is, port ID = port priority + port number. The
system first compares port priority values and then port numbers and the small port
ID is considered prior.
Link Aggregation Configuration
Command
link-aggregation group agg_id description
alname
description
save
Command
lacp system-priority system_priority_value
undo lacp system-priority
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command, the configured