3Com 3C17203 - SuperStack 3 Switch 4400, Implementation Manual

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Aggregated Links 33
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 four active aggregations can be created. A maximum
of up to four ports may be added manually to any individual
aggregation, but any number may join automatically via LACP. There
are however a few points to consider:
■
Switch 4400 Series — The Switch only supports a maximum of
four active ports in any individual aggregation. Any extra ports will
remain in a standby state and may become active if one of the four
active ports fails.
■
If multiple links are connected between a unit and more than four
other devices as shown in
Figure 4 , only four of the devices will be
assigned to aggregated links. The remaining devices will each only
have one link made
active , that is, passing data. All other links will
be made inactive to prevent loops occurring.
LACP detects if one of the existing four aggregated links is
removed and will then automatically assign one of the remaining
devices to the aggregated link that has become free.
Figure 4 How LACP works on a Switch with multiple aggregated links