Link aggregation modes, Aggregating links in static mode, Selecting a reference port – H3C Technologies H3C WX3000E Series Wireless Switches User Manual
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3.
LACP timeout interval
The LACP timeout interval specifies how long a member port waits to receive LACPDUs from the peer port.
If a local member port fails to receive LACPDUs from the peer within three times the LACP timeout interval,
the member port assumes that the peer port has failed. You can configure the LACP timeout interval as
the short timeout interval (1 second) or the long timeout interval (30 seconds).
Link aggregation modes
Link aggregation has the following modes: dynamic and static. Dynamic link aggregation uses LACP
and static link aggregation does not.
compares the two aggregation modes.
Table 5 A comparison between static and dynamic aggregation modes
Aggregatio
n mode
LACP status on
member ports
Pros Cons
Static Disabled
Aggregation is stable. The
aggregation state of the member
ports are not affected by the peer
ports.
The member ports do not adjust the
aggregation state according to
that of the peer ports. The
administrator must manually
maintain link aggregations.
Dynamic Enabled
The administrator does not need to
maintain link aggregations. The
peer systems maintain the
aggregation state of the member
ports automatically.
Aggregation is unstable. The
aggregation state of member ports
is susceptible to network changes.
In a dynamic link aggregation group:
•
A Selected port can receive and send LACPDUs.
•
An Unselected port can receive and send LACPDUs only if it is up and has the same class-two
configurations as the aggregate interface.
Aggregating links in static mode
LACP is disabled on the member ports in a static aggregation group. You must manually maintain the
aggregation state of the member ports.
The static link aggregation process comprises:
•
•
Setting the aggregation state of each member port
Selecting a reference port
The system selects a reference port from the member ports that are in the up state and have the same
class-two configurations as the aggregate interface.
The candidate ports are sorted by aggregation priority, duplex, and speed in the following order:
•
Lowest aggregation priority value
•
Full duplex/high speed
•
Full duplex/low speed
•
Half duplex/high speed
•
Half duplex/low speed