Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 422

Configuration Commands
Default No ports are defined as members of a LAG.
Parameters
port-id — The port ID configured or displayed in the slot/mda/port format.
priority priority — Port priority used by LACP. The port priority is also used to determine the
subgroup sub-group-id — This parameter identifies a LAG subgroup. When using subgroups in a
port-threshold
Syntax port-threshold value [action {dynamic-cost | down}
no port-threshold
Context config>lag lag-id
Description
This command configures the behavior for the Link Aggregation Group (LAG) if the number of
operational links is equal to or below a threshold level.
The no form of this command reverts to the default values.
Default 0 action down
Parameters
value — The decimal integer threshold number of operational links for the LAG at or below which
action {dynamic-cost | down} — Specifies the action to take if the number of active links in the
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primary port. The port with the lowest priority is the primary port. In the event of a tie, the
smallest port ID becomes the primary port.
Values 1 — 65535
LAG, they should only be configured on one side of the LAG, not both. Only having one side
perform the active/standby selection will guarantee a consistent selection and fast convergence.
The active/standby selection will be signalled through LACP to the other side. The hold time
should be configured when using subgroups to prevent the LAG going down when switching
between active and standby links in case no links are usable for a short time, especially in case a
subgroup consists of one member.
Values 1 — 8 identifies a LAG subgroup.
The auto-iom subgroup is defined based on the IOM (all ports of the same IOM
are assigned to the same subgroup).
The auto-mda subgroup is defined based on the MDA.
the configured action will be invoked. If the number of operational links exceeds the port-
threshold value, any action taken for being below the threshold value will cease.
Values
0 — 15
LAG is at or below the threshold value.
When the dynamic-cost action is specified, then dynamic costing will be activated. As a result
the LAG will remain operationally up with a cost relative to the number of operational links. The
link will only be regarded as operationally down when all links in the LAG are down.
When the down action is specified, then the LAG will be brought operationally down if the
number of operational links is equal to or less than the configured threshold value. The LAG will
only be regarded as up once the number of operational links exceeds the configured threshold
value.
7750 SR OS Interface Configuration Guide