24 CHAPTER 2: OPTIMIZING BANDWIDTH
By default, LACP is disabled on all Switch ports.
If a member link in an aggregated link fails, the traffic using that link is
dynamically reassigned to the remaining member links in the aggregated
link. Figure 2
shows the simplest case: two member links, that is the
physical links, form an aggregated link. In this example, if link 1 fails, the
data flow between X and B is remapped to physical link 2. The
re-mapping occurs as soon as the Switch detects that a member link has
failed — almost instantaneously. As a result, aggregated link
configurations are extremely resilient and fault-tolerant.
Figure 2 Dynamic Reassignment of Traffic Flows
The key benefits of 802.3ad link aggregation are:
■ Automatic configuration — network management does not need to
be used to manually aggregate links.
■ Rapid configuration and reconfiguration — approximately one to
three seconds.
■ Compatibility — non-802.3ad devices can interoperate with 802.3ad
enabled devices. However, you will need to manually configure the
aggregated links as LACP will not be able to automatically detect and
form an aggregation with a non-802.3ad device.
■ The operation of 802.3ad can be configured and managed via
network management.
A
X
Y
B
Z
Aggregated Link
Physical Link 1
Physical Link 2
X
B
1
X
B
0
Y
A
X
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