HP A6600 Configuration Manual page 20

Reference port
When setting the aggregation state of the ports in an aggregation group, the system automatically picks
a member port as the reference port. A selected port must have the same port attributes and class-two
configurations as the reference port.
LACP
The IEEE 802.3ad LACP enables dynamic aggregation of physical links. It uses LACPDUs for exchanging
aggregation information between LACP-enabled devices.
LACP functions
1.
Table 2 LACP functions
Category
Basic LACP functions
LACP priorities
2.
LACP priorities have the following types: system LACP priority and port aggregation priority, as described
in Table 3.
Table 3 LACP priorities
Type
System LACP
priority
Port aggregation
priority
LACP timeout interval
3.
The LACP timeout interval specifies how long a member port waits to receive LACPDUs from the peer port.
If a local member port fails to receive LACPDUs from the peer within three times the LACP timeout interval,
the member port assumes that the peer port has failed. Configure the LACP timeout interval as the short
timeout interval (1 second) or the long timeout interval (30 seconds).
Description
Implemented through the basic LACPDU fields, including the system LACP priority,
system MAC address, port aggregation priority, port number, and operational
key.
Each member port in a LACP-enabled aggregation group exchanges information
with its peer. When a member port receives an LACPDU, it compares the received
information with the information received on the other member ports. In this way
the two systems reach an agreement on which ports should be placed in the
selected state.
Description
Used by two peer devices (or systems) to determine which one is
superior in link aggregation.
In dynamic link aggregation, the system that has higher system LACP
priority sets the selected state of member ports on its side first and
then the system that has lower priority sets port state accordingly.
Determines the likelihood of a member port to be selected on a
system. The higher port aggregation priority, the higher likelihood.
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Remarks
The smaller the
priority value,
the higher the
priority