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HP A3100-8 v2 SI Configuration Manual: Link Aggregation Modes

A3100 v2 switch series layer 2 - lan switching.
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LACP functions
The IEEE 802.3ad LACP offers basic LACP functions and extended LACP functions, as described in
Table 3 Basic and extended LACP functions
Basic LACP functions
Extended LACP
LACP priorities
LACP priorities have two types: system LACP priority and port LACP priority.
Table 4 LACP priorities
System LACP
Port LACP priority
LACP timeout interval
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. You can configure the LACP timeout interval as
either the short timeout interval (1 second) or the long timeout interval (30 seconds).

Link aggregation modes

Link aggregation has two modes: dynamic and static. Dynamic link aggregation uses LACP and static
link aggregation does not.
Implemented through the basic LACPDU fields, including the system LACP priority,
system MAC address, port LACP priority, port number, and operational key.
Each member port in a LACP-enabled aggregation group exchanges the preceding
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.
Implemented by extending the LACPDU with new Type/Length/Value (TLV) fields.
This is how the LACP multi-active detection (MAD) mechanism of the Intelligent
Resilient Framework (IRF) feature is implemented. An A3100 v2 switch series can
participate in LACP MAD as either an intermediate device.
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 the port state accordingly.
Determines the likelihood of a member port to be selected on a system.
The higher the port LACP priority, the higher the likelihood.
Table 5
compares the two aggregation modes.
The smaller the
priority value,
the higher the


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