3com WX3000 Manuel D’Utilisation

 

1-3 

For an aggregation group: 

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When the rate or duplex mode of a port in the aggregation group changes, packet loss may occur 

on this port; 

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When the rate of a port decreases, if the port belongs to a manual or static LACP aggregation 

group, the port will be switched to the unselected state; if the port belongs to a dynamic LACP 

aggregation group, deaggregation will occur on the port. 

 

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 must contain at least one port. When a static aggregation group contains 

only one port, you cannot remove the port unless you remove the whole aggregation group. 

LACP is enabled on the member ports of static aggregation groups. When you remove a static 

aggregation group, all the member ports in up state form one or multiple dynamic aggregations with 

LACP enabled. LACP cannot be disabled on static aggregation ports. 

A port in a static aggregation group can be in one of the two states: selected or unselected. 

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Both the selected and the unselected ports can transceive LACP protocol packets. 

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Only the selected ports can transceive service packets; the unselected ports cannot. 

In a static aggregation group, the system sets the ports to selected or unselected state according to the 

following rules. 

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The system determines the master 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 port. 

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The ports connected to a peer device different from the one the master port is connected to or 

those connected to the same peer device as the master port but to a peer port that is not in the 

same aggregation group as the peer port of the master port are unselected ports.  

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The ports unable to aggregate with the master port (due to some hardware limit) are unselected 

ports. 

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The system sets the ports with basic port configuration different from that of the master port 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.