3com 4210 PWR 9-Port 3CR17341-91-ME User Manual

C

HAPTER

 10: L

INK

 A

GGREGATION

 C

ONFIGURATION

Depending on different aggregation modes, the following three types of link 
aggregation exist:

■

Manual aggregation

■

Static LACP aggregation

■

Dynamic LACP aggregation

A manual aggregation group is manually created. All its member ports are 
manually added and can be manually removed (it inhibits the system from 
automatically adding/removing ports to/from it). Each manual aggregation group 
must contain at least one port. When a manual aggregation group contains only 
one port, you cannot remove the port unless you remove the whole aggregation 
group.

LACP is disabled on the member ports of manual aggregation groups, and you 
cannot enable LACP on ports in a manual aggregation group.

A port in a manual aggregation group can be in one of the two states: selected or 
unselected. In a manual aggregation group, only the selected ports can forward 
user service packets.

In a manual aggregation group, the system sets the ports to selected or unselected 
state according to the following rules.

■

Among the ports in an aggregation group that are in up state, the system 
determines the mater port with one of the following settings being the highest 
(in descending order) as the master port: full duplex/high speed, full duplex/low 
speed, half duplex/high speed, half duplex/low speed. The ports with their rate, 
duplex mode and link type being the same as that of the master port are 
selected ports, and the rest are unselected ports.

■

The system sets the ports unable to aggregate with the master port (due to 
some hardware limit) to unselected state.

■

There is a limit on the number of selected ports in an aggregation group. 
Therefore, if the number of the selected ports in an aggregation group exceeds 
the maximum number supported by the device, those with lower port numbers 
operate as the selected ports, and others as unselected ports.

Among the selected ports in an aggregation group, the one with smallest port 
number operates as the master port. Other selected ports are the member ports.

Generally, there is no limit on the rate and duplex mode of the ports (also 
including initially down port) you want to add to a manual aggregation group.

A static LACP aggregation group is also manually created. All its member ports are 
manually added and can be manually removed (it inhibits the system from 
automatically adding/removing ports to/from it). Each static aggregation group