3Com Switch 8800 Configuration Guide
Chapter 7 Link Aggregation Configuration
7-8
Note:
If you save the current configuration using the
save
command, the static and dynamic
LACP aggregation groups and their description strings remains on the system after
rebooting, but not the dynamic LACP aggregation groups, or their description strings.
7.2.5 Configuring System Priority
The LACP refers to system IDs to determine if the member ports are active or inactive
for a dynamic LACP aggregation group. The system ID consists of two-byte system
priority and six-byte system MAC (system ID = system pr 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 considered
prior. Changing system priority may affect the priority levels of member ports, and
further their active or inactive state.
Perform the following configuration in system view.
Table 7-5
Configure system priority
Operation
Command
Configure system priority
lacp
system
-
priority
system
-
priority
-
value
Restore the default system priority
undo
lacp
system
-
priority
By default, system priority is 32,768.
7.2.6 Configuring Port Priority
The LACP compares system IDs first and then port IDs (if system IDs are the same) to
determine if the member ports are active or inactive for a dynamic LACP aggregation
group. If the ports in an aggregation group exceed the port quantity threshold for that
group, the system sets some ports with smaller port IDs as active ports and others as
inactive ports. The port ID consists of two-byte port priority and two-byte port number,
that is, port ID = port pr port number. The system first compares port priority
values and then port numbers and the small port ID is considered prior.
Perform the following configuration in Ethernet port view.
Table 7-6
Configure port priority
Operation
Command
Configure port priority
lacp
port
-
priority
port
-
priority
-
value
Restore the default port priority
undo
lacp
port
-
priority
By default, port priority is 32,768.
