Dell PowerConnect B-RX Configuration Manual page 308

8
Configuration of a LAG
Configuring the primary port for a LAG
In previous versions of the Multi-Service IronWare software, the lowest number port was assigned
as the primary port in a trunk or LACP configuration. In version 02.6.00 and later, the primary port
must be explicitly assigned. using the primary port command.
To designate the primary port for the static LAG "blue", use the following command.
BigIron RX(config)# lag blue static
BigIron RX(config-lag-blue)# primary port 3/2
Syntax: [no] primary port <slot/port>
Once a primary port has been configured for a LAG, all configurations that apply to the primary port
are applied to the other ports in the LAG.
NOTE
This configuration is only applicable for configuration of a static or dynamic LAGs.
Specifying the trunk threshold for a trunk Group
You can configure the device switch to disable all of the ports in a trunk group when the number of
active member ports drops below a specified threshold value. For example, if a trunk group has 8
ports, and the threshold for the trunk group is 5, then the trunk group is disabled if the number of
available ports in the trunk group drops below 5. If the trunk group is disabled, then traffic is
forwarded over a different link or trunk group.
NOTE
This configuration is only applicable for configuration of a static or dynamic LAGs.
For example, the following commands establish a trunk group consisting of 4 ports, then establish
a threshold for this trunk group of 3 ports.
BigIron RX(config)# lag blue static
BigIron RX(config-lag-blue)# ports ethernet 3/1 to 3/4
BigIron RX(config-lag-blue)# trunk-threshold 3
In this example, if the number of active ports drops below 3, then all the ports in the trunk group
are disabled.
Syntax: trunk-threshold <number>
You can specify a threshold from 1 (the default) up to the number of ports in the trunk group.
When a LAG is shut down because the number of ports drops below the configured threshold, the
LAG is kept intact and it is re-enabled if enough ports become active to reach the threshold.
NOTE
Trunk threshold should be configured only at one end of the trunk. If it is set on both sides, link
failures will result in race-conditions and the trunk will not function properly.
236 BigIron RX Series Configuration Guide
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