3com 8807 Guia Do Utilizador

C

HAPTER

 14: L

INK

 A

GGREGATION

 C

ONFIGURATION

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Aggregation groups of special ports with hardware aggregation resources 
included, such as non-limited-speed 10GE ports

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Aggregation groups that probably reach the maximum potential rate after the 
resources are allocated to them

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Aggregation groups with the minimum master port numbers if they reach the 
equal rate with other groups after the resources are allocated to them

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Manual aggregation has a higher priority level than static aggregation, and 
static aggregation has a higher priority level than dynamic aggregation

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Under the same conditions, an aggregation group that has occupied resources 
has a higher priority level than an aggregation group waiting for occupied

When aggregation groups of higher priority levels appear, the aggregation groups 
of lower priority levels release their hardware resources. For single-port 
aggregation groups, if they can transmit and receive packets normally without 
occupying hardware resources, they shall not occupy the resources.

In a aggregation group, its ports may be in active or inactive state and only the 
active ports can transmit and receive user service packets, but not inactive ports. 
The active port with the minimum port number serves as the master port, while 
others as slave ports.

In a aggregation group, the system sets the ports to active or inactive state based 
on these rules:

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Based on the descending order of priority levels from full duplex/high speed, to 
full duplex/low-speed, to half duplex/high speed and till half duplex/low speed, 
the system sets the port with the highest priority to active state, and others to 
inactive state.

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The system sets to inactive state the ports which cannot aggregate with the 
master port, due to hardware limit.

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The system sets to inactive state the ports with basic configurations different 
from the master port.

Since only a defined number of ports can be supported in an aggregation group, 
then if the active ports in an aggregation group exceed the port quantity threshold 
for that group, the system shall set some ports with smaller port numbers (in 
ascending order) as active ports and others as inactive ports. The active ports can 
transmit and receive user service packets, but not inactive ports.

A load sharing aggregation group may contain several active ports, but a non-load 
sharing aggregation group can only have one active port, while others as inactive 
ports.

The following sections describe link aggregation tasks:

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