H3C Technologies H3C S12500 Series Switches - Manual (Page 132)

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• All member ports change to the Unselected state and the link of the aggregate interface goes down,
when the number of member ports eligible for being selected is smaller than the minimum
threshold.
• When the minimum threshold is reached, the eligible member ports change to the Selected state,
and the link of the aggregate interface goes up.
The maximum number of Selected ports allowed in an aggregation group is limited by either the
configured maximum number or hardware capability, whichever value is smaller.
You can configure redundancy between two ports using the following guideline: Assign two ports to an
aggregation group, and configure the maximum number of Selected ports allowed in the aggregation
group as 1. In this way, only one Selected port is allowed in the aggregation group at any point in time,
while the Unselected port serves as a backup port.
To limit the number of Selected ports for an aggregation group:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter aggregate interface
view.
• Enter Layer 2 aggregate
interface view:
interface bridge-aggregation
interface-number
• Enter Layer 3 aggregate
interface view:
interface route-aggregation
interface-number
Use either command.
3. Set the minimum number of
Selected ports for the
aggregation group.
link-aggregation selected-port
minimum number
By default, the minimum number of
Selected ports is not specified.
Make sure the minimum number of
Selected ports required to bring up
an aggregation group is the same
on both ends.
4. Set the maximum number of
Selected ports for the
aggregation group.
link-aggregation selected-port
maximum number
By default, the maximum number of
Selected ports allowed in an
aggregation group is limited only
by the hardware capabilities of the
member ports.
Shutting down an aggregate interface
Shutting down or bringing up an aggregate interface affects the aggregation state and link state of ports
in the corresponding aggregation group in the following ways:
• When an aggregate interface is shut down, all Selected ports in the corresponding aggregation
group become unselected and their link state becomes down.
• When an aggregate interface is brought up, the aggregation state of ports in the corresponding
aggregation group is recalculated and their link state becomes up.
To bring up an aggregate interface: