3com 5500-ei pwr Instruccion De Instalación

 

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

unselected state. 

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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. 

A dynamic LACP aggregation group is automatically created and removed by the system. Users cannot 

add/remove ports to/from it. Ports can be aggregated into a dynamic aggregation group only when they 

are connected to the same peer device and have the same speed, duplex mode, and basic 

configurations, and their peer ports have the same configurations.  

Besides multiple-port aggregation groups, the system is also able to create single-port aggregation 

groups, each of which contains only one port. LACP is enabled on the member ports of dynamic 

aggregation groups. 

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

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Both the selected and the unselected ports can receive/transmit LACP protocol packets; 

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The selected ports can receive/transmit user service packets, but the unselected ports cannot. 

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In a dynamic aggregation group, the selected port with the smallest port number serves as the 

master port of the group, and other selected ports serve as member ports of the group. 

There is a limit on the number of selected ports in an aggregation group. Therefore, if the number of the 

member ports that can be set as selected ports in an aggregation group exceeds the maximum number 

supported by the device, the system will negotiate with its peer end, to determine the states of the 

member ports according to the port IDs of the preferred device (that is, the device with smaller system 

ID). The following is the negotiation procedure: 

1)  Compare device IDs (system priority + system MAC address) between the two parties. First 

compare the two system priorities, then the two system MAC addresses if the system priorities are 

equal. The device with smaller device ID will be considered as the preferred one. 

2)  Compare port IDs (port priority + port number) on the preferred device. The comparison between 

two port IDs is as follows: First compare the two port priorities, then the two port numbers if the two 

port priorities are equal; the port with the smallest port ID is the selected port and the left ports are 

unselected ports.