H3C Technologies H3C S12500-X Series Switches - Manual (Page 57)

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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 backup between two ports by assigning two ports to an aggregation group and
configuring 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 set the minimum and maximum numbers of Selected ports for an aggregation group:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 aggregate
interface view.
interface bridge-aggregation
interface-number
N/A
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 for the aggregation
group is not specified.
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 for an aggregation
group is 16.
Configuring the expected bandwidth of an aggregate interface
To set the expected bandwidth of an aggregate interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 aggregate
interface view.
interface bridge-aggregation
interface-number
N/A
3. Configure the expected
bandwidth of the interface.
bandwidth bandwidth-value
By default, the expected
bandwidth (in kbps) is the interface
baud rate divided by 1000.
Shutting down an aggregate interface
Make sure no member port in an aggregation group is configured with the loopback command when
you shut down the aggregate interface. Similarly, a port configured with the loopback command cannot
be assigned to an aggregate interface already shut down. For more information about the loopback
command, see Layer 2—LAN Switching Command Reference.
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.