Link Aggregation Control Protocol (LACP)
Enterasys C3 Configuration Guide 11-45
• A globally unique identifier for each device that participates in link aggregation.
• A means of identifying the set of capabilities associated with each port and with each
aggregator, as understood by a given device.
• A means of identifying a LAG and its associated aggregator.
Flexible Link Aggregation Groups
Starting with v6.61, you can define the maximum number of Link Aggregation Groups (LAGs)
that can be supported on the switch, although the maximum number of physical ports on the
switch that can be aggregated remains at 48 ports.
Use the command “set lacp groups” on page 11-58 to set the maximum number of LAGs to 6, 12.
or 24. Since the maximum number of physical aggregateable ports remains 48, if you set the
maximum number of LAGs to:
• 6, each LAG can have up to 8 associated physical ports. This is the system default.
• 12, each LAG can have up to 4 associated physical ports
• 24, each LAG can have up to 2 associated physical ports
Changing the maximum number of LAGs requires a system reset and the LACP configuration will
be returned to default values. You are prompted to confirm the change before the system executes
the command.
The virtual link aggregation ports continue to be designated as lag.0.x, where x can range from 1
to 24, depending on the maximum number of LAGs configured.
LACP Terminology
Table 11-6 defines key terminology used in LACP configuration.
Note: The path cost of a LAG port will be displayed as zero when it is not an active link.
Table 11-6 LACP Terms and Definitions
Term Definition
Aggregator Virtual port that controls link aggregation for underlying physical ports. Each
Enterasys C3 module provides 6, 12, or 24 aggregator ports, which are
designated in the CLI as lag.0.x, where x can range from 1 to the number of
aggregator ports allowed.
LAG Link Aggregation Group. Once underlying physical ports (for example, ge.x.x)
are associated with an aggregator port, the resulting aggregation will be
represented as one LAG with a lag.0.x port designation.
A maximum of 48 physical ports may be aggregated at any one time.
LACPDU Link Aggregation Control Protocol Data Unit. The protocol exchanges
aggregation state/mode information by way of a port’s actor and partner
operational states. LACPDUs sent by the first party (the actor) convey to the
second party (the actor’s protocol partner) what the actor knows, both about
its own state and that of its partner.
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