Dell PowerConnect B-FCXs, Configuration Manual

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PowerConnect B-Series FCX Configuration Guide 411
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Dynamic link aggregation
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With LACP trunk configurations, the LACP system id is the MAC address of the Active Controller.
If the LACP system id changes, the entire trunk flaps and an STP re-convergence occurs.
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Link aggregation can be used to form multi-slot aggregate links on stack units, but the link
aggregation keys must match for the port groups on each stack unit. For example, to configure
an aggregate link containing ports 1/1/1 through 1/1/4, and 3/1/5 through 3/1/8, you must
change the link aggregation key on one or both port groups so that the key is the same for all 8
ports. See the following example.
IronStack LACP trunk group configuration example
To configure a trunk group consisting of two groups of two ports each on an IronStack, enter
commands similar to the following.
PowerConnect(config)#interface ethernet 1/1/1 to 1/1/4
PowerConnect(config-mif-1/1/1-1/1/4)#link-aggregate off
PowerConnect(config-mif-1/1/1-1/1/4)#link-aggregate configure key 10000
PowerConnect(config-mif-1/1/1-1/1/4)#link-aggregate active
PowerConnect(config-mif-1/1/1-1/1/4)#interface ethernet 3/1/5 to 3/1/8
PowerConnect(config-mif-3/1/5-3/1/8)#link-aggregate off
PowerConnect(config-mif-3/1/5-3/1/8)#link-aggregate configure key 10000
PowerConnect(config-mif-3/1/5-3/1/8)#link-aggregate active
This command sequence changes the key for ports 1/1/1-1/1/4 and 3/1/5-3/1/8 to 10000.
Since all ports in an aggregate link must have the same key, this example forms a multi-slot
aggregate link for ports 1/1/1-1/1/4 and
3/1/5-3/1/8.
Examples of valid LACP trunk groups
Dell PowerConnect ports follow the same configuration rules for dynamically created aggregate
links as they do for statically configured trunk groups. Refer to
“Trunk group rules” on page 395
and “Trunk group load sharing” on page 398.
Figure 82 on page 412 shows some examples of valid aggregate links.