Configuring System Priority; Configuring Port Priority - 3Com 8800 Configuration Manual

3Com Switch 8800 Configuration Guide
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 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 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
Configure system priority
Restore the default 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 priority + 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
Configure port priority
Restore the default port priority
By default, port priority is 32,768.
Operation
Operation
7-8
Chapter 7 Link Aggregation Configuration
Command
lacp system-priority system-priority-value
undo lacp system-priority
Command
lacp port-priority port-priority-value
undo lacp port-priority