3Com 5500-SI Configuration Manual page 69

Types of Link Aggregation
The types of link aggregation are described in the following sections:
Manual Aggregation and Static LACP Aggregation
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Dynamic LACP Aggregation
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Manual Aggregation and Static LACP Aggregation Both manual aggregation
and static LACP aggregation require manual configuration of aggregation groups and
prohibit automatic adding or deleting of member ports by the system. A manual or
static LACP aggregation group must contain at least one member port, and you must
delete the aggregation group, instead of the port, if the group contains only one port.
At a manual aggregation port, LACP is disabled and you are not allowed to enable it.
LACP is enabled at a static aggregation port. When a static aggregation group is
deleted, its member ports form one or several dynamic LACP aggregation groups and
LACP remains enabled on them. You are not allowed to disable LACP protocol at a
static aggregation group.
In a manual or static LACP aggregation group, its ports may be in active or inactive
state and only the active ports can transceive user service packets. The active port
with the minimum port number serves as the master port, while others as sub-ports.
In a manual aggregation group, the system sets the ports to active or inactive state by
using these rules:
The system sets the port with the highest priority to active state, and others to
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inactive state based on the following descending order of priority levels:
full duplex/high speed
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full duplex/low speed
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half duplex/high speed
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half duplex/low speed
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The system sets to inactive state the ports which cannot aggregate with the active
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port with minimum port number, due to hardware limit, for example, trans-board
aggregation unavailable.
The system sets to inactive state the ports with basic configurations different from
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that of the active port with minimum port number.
In a static LACP aggregation group, the system sets the ports to active or inactive
state by using these rules:
The system sets the port with the highest priority to active state, and others to
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inactive state based on the following descending order of priority levels:
full duplex/high speed
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full duplex/low speed
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half duplex/high speed
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half duplex/low speed
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The system sets to inactive state the ports which connect to different peer devices
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from one that the active port with minimum port number connects to, or the ports
in different aggregation groups though they are connected to the same peer
device.
The system sets to inactive state the ports which cannot aggregate with the active
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port with minimum port number, due to hardware limit, for example, trans-board
aggregation unavailable.
Link Aggregation Configuration 69