Aggregated Links 21
member of an aggregated link for Switch A in error, LACP (if it is
enabled) will detect this and place the port in the aggregated link for
Switch B, thus overriding the manual configuration.
Figure 3 Aggregated Link — Example
■ LACP Automatic Aggregations — If LACP detects at least two active
ports sharing the same partner device, and if no matching
pre-configured aggregated links exist, LACP will automatically assign a
free un-configured aggregated link to form an aggregated link with
the partner device.
If you have an existing single port connection between two devices,
this automatic behavior allows quick and easy addition of extra
bandwidth by simply adding an extra physical link between the units.
The Spanning Tree costs for a port running LACP is the cost assigned for
an aggregated link running at that speed. As required by the IEEE Std
802.3-2002 (incorporating 802.3ad), no changes in cost are made
according to the number of member links in the aggregated link.
Aggregated Links and
Your Switch
■ When any port is assigned to an aggregated link (either manually or
via LACP) it will adopt the configuration settings of the aggregated
link. When a port leaves an aggregated link its original configuration
settings are restored.
■ A maximum of six active aggregations can be created. A maximum of
up to eight ports may be added manually to any individual
aggregation, or via LACP. There are however a few points to consider:
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