3Com 3C17203 - SuperStack 3 Switch 4400, Руководство по внедрению

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Aggregated Links 31
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.
Implementing
802.3ad Aggregated
Links
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, and if a more appropriate or correct automatic
membership is detected by LACP, it will override the manual
configuration.
For example, in Figure 3 , if a port on Switch C is physically connected
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.