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Link Aggregation Control Protocol (LACP)
is, will block redundant paths). For information about building static aggregations, refer to set
lacp static (page
Each SecureStack C2 module provides six virtual link aggregator ports, which are designated in
the CLI as lag.0.1 through lag.0.6. Each LAG can have up to eight associated physical ports. Once
underlying physical ports (for example, fe.x.x, or
the resulting aggregation will be represented as one LAG with a lag.0.x port designation. LACP
determines which underlying physical ports are capable of aggregating by comparing operational
keys. Aggregator ports allow only underlying ports with keys matching theirs to join their LAG.
LACP uses a system priority value to build a LAG ID, which determines aggregation precedence.
If there are two partner devices competing for the same aggregator, LACP compares the LAG IDs
for each grouping of ports. The LAG with the lower LAG ID is given precedence and will be
allowed to use the aggregator.
There are a few cases in which ports will not aggregate:
•
An underlying physical port is attached to another port on this same switch (loopback).
•
There is no available aggregator for two or more ports with the same LAG ID. This can
happen if there are simply no available aggregators, or if none of the aggregators have a
matching admin key and system priority.
•
802.1x authentication is enabled using the set eapol command (page
would otherwise aggregate are not 802.1X authorized.
The LACP implementation on the SecureStack C2 device will allow up to eight physical ports into
a LAG. The device with the lowest LAG ID determines which underlying physical ports are
allowed into a LAG based on the ports' LAG port priority. Ports with the lowest LAG port priority
values are allowed into the LAG and all other speed groupings go into a standby state.
Multi‐port LAGs will continue to operate as long as there is at least one active port in the LAG.
Therefore, there is no need to create backup single port LAGs or to specifically assign the LAG and
all its physical ports to the egress list of the LAG's VLAN.
Typically, two or more ports are required to form a LAG. However, you can enable the creation of
single port LAGs as described in "set lacp singleportlag" on page 7‐46. If a single port LAG goes
down and the switch stays up, the switch will reconfigure the LAG to the same LAG number if the
port comes back up.
Commands
For information about...
show lacp
set lacp
set lacp asyspri
set lacp aadminkey
clear lacp
set lacp static
clear lacp static
7-40 Port Configuration
7‐44).
Note: To aggregate, underlying physical ports must be running in full duplex mode and must be of
the same operating speed.
.x.x) are associated with an aggregator port,
ge
23‐19) and ports that
Refer to page...
7-41
7-42
7-43
7-43
7-44
7-44
7-45
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