7.
Link Aggregation Groups (LAGs)
MN700004 Rev 01
53
Prerequisites
The following guidelines apply to LAG configuration:
•
You do not need to do any changes to existing higher-layer protocols or
applications in order to use Link Aggregation.
•
Links that cannot take part in Link Aggregation - due to their inherent
capabilities or the capabilities of the devices to which they attach, or due to
management configuration -operate as normal, individual links.
•
LACP supports only point-to-point full-duplex links. Aggregations among more
than two devices (multipoint aggregations) and half-duplex operation are not
supported.
•
All links in a Link Aggregation Group operate at the same data rate (e.g., 10
Mbps, 100 Mbps, or 1000 Mbps).
•
The ports that participate in a LAG must all be of the same bandwidth. 10/100
BaseTx copper ports must belong to the same slot or device, but need not be
contiguous (e.g. – you may include ports 1/1/3 and 1/1/5 in a LAG without
including port 1/1/2).
•
When the switch is connected to a LAN and Spanning Tree protocol is not
active, physically connect the aggregated ports ONLY after LAG configuration
is completed.
Default Link Aggregation Configuration
Table 7-1 shows the default Link Aggregation configuration.
Table 7-1 Link Aggregation Default Configuration
P a r a m e t e r D e f a u l t
V a l u e
Static Link Aggregation
Disabled
Global Link Aggregation Control Protocol (LACP)
Disabled
Per port Link Aggregation Control Protocol (LACP)
Disabled
LACP system priority
32768