3com S7906E Manuel De Montage

 

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determine port state based on the port IDs on the end with the preferred system ID. The following is the 

detailed negotiation procedure: 

z 

Compare the system ID (comprising the system LACP priority and the system MAC address) of the 

actor with that of the partner. The system with the lower LACP priority wins out. If they are the same, 

compare the system MAC addresses. The system with the smaller MAC address wins out. 

z 

Compare the port IDs of the ports on the system with the smaller system ID. A port ID comprises a 

port LACP priority and a port number. First compare the port LACP priorities. The port with the 

lower LACP priority wins out. If two ports are with the same LACP priority, compare their port 

numbers. The port with the smaller port ID, that is, the port with smaller port number, is selected as 

the reference port.  

z 

If a port (in up state) is with the same port attributes and class-two configuration as the reference 

port, and the peer port of the port is with the same port attributes and class-two configurations as 

the peer port of the reference port, consider the port as a candidate selected port; otherwise set the 

port to the unselected state.  

z 

The number of selected ports that an aggregation group can contain is limited. When the number of 

candidate selected ports is under the limit, all the candidate selected ports are set to selected state. 

When the limit is exceeded, the system selects the candidate selected ports with smaller port IDs 

as the selected ports, and set other candidate selected ports to unselected state. At the same time, 

the peer device, being aware of the changes, changes the state of its ports accordingly.  

For static and dynamic aggregation modes:  

z 

In an aggregation group, the port to be a selected port must be the same as the reference port in 

port attributes, and class-two configurations. To keep these configurations consistent, you should 

configure the port manually.  

z 

Because changing a port attribute or class-two configuration setting of a port may cause the select 

state of the port and other member ports to change and thus affects services, you are 

recommended to do that with caution.  

 

A link aggregation groups operates in load sharing aggregation mode or non-load sharing mode.  

The system sets the load sharing mode of an aggregation group as follows: 

z 

When hardware resources are available, a link aggregation group operates in load sharing mode. 

z 

After hardware resources are depleted, that is, when the total number of created load-sharing 

aggregation groups and load-sharing service loopback groups reaches the upper threshold, all 

new link aggregation groups operate in non-load sharing mode.