3Com 10014298 Setting or Deleting an Aggregation Group Descriptor, Configuring System Priority

48CHAPTER 2: PORT CONFIGURATION

Setting or Deleting an Aggregation Group Descriptor

Perform the following configuration in system view.

Table 42 Set/Delete an Aggregation Group Descriptor

Operation	Command
Set aggregation group descriptor	link-aggregation group agg-id
	description alname
Delete aggregation group descriptor	undo link-aggregation group
	agg-iddescription

By default, an aggregation group has no descriptor.

Note that if you have saved the current configuration with the save command, the configured manual aggregation groups, static LACP aggregation groups and corresponding descriptors will be retained when the system reboots. However, the dynamic LACP groups and descriptors are not retained when the system reboots.

Configuring System Priority

The LACP refers to system IDs in determining if the member ports are selected or standby one 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 considered prior.

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 43 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 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 ones 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 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.