Implementing 802.3Ad Aggregated Links - 3Com 3C17300-US Implementation Manual

Implementing
802.3ad Aggregated
Links
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
A
X
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.
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Compatibility — non-802.3ad devices can interoperate with a
■
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.
The operation of 802.3ad can be configured and managed via
■
network management.
LACP can be enabled or disabled on a per port basis. You can implement
802.3ad aggregated links in three ways:
Manual Aggregations — You can manually add and remove ports to
■
and from an aggregated link via Web or CLI commands. However, if a
port has LACP enabled, if a more appropriate or correct automatic
membership is detected by LACP, it will override the manual
configuration.
For example, in Figure
to Switch B, but you manually configure the port on Switch C to be a
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.
Physical Link 2
Y A
X
B
1
X
Aggregated Link
X B
2
Physical Link 1
3, if a port on Switch C is physically connected
Aggregated Links 27
Y
B
Z