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416 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
Dynamic link aggregation
12
NOTE
For more information about keys, including details about the syntax shown above, refer to
“Key” on page 417.
How changing the VLAN membership of a port
affects trunk groups and dynamic keys
When you change a port VLAN membership and the port is currently a member of a trunk group,
the following changes occur to the trunk group:
• The Dell PowerConnect device tears down the existing trunk group.
• All ports in the trunk group get a new key.
• The new key group aggregates into a new trunk group.
When you change a port VLAN membership, and the port is not a member of a trunk group, the
following changes occur:
• The port gets a new key depending on changes to the port VLAN tag type, as follows:
• Tagged to Tagged VLAN – The primary port of the trunk group gets a new key.
• Tagged to Untagged VLAN –The port gets the default key for untagged ports.
• Untagged to Tagged VLAN – If the Dell PowerConnect device finds a port with matching
port properties, the port gets that port key. If it does not find one, the port gets a new key.
• Untagged to Untagged VLAN – The port gets a new key depending on whether it is in the
default VLAN or not. If there is a trunk group associated with the key, it is not affected.
• All other ports keep their existing key.
• The new key groups try to aggregate into trunk groups.
Additional trunking options for LACP trunk ports
Additional trunking options are supported on individual ports that are part of an 802.3ad
aggregate link. Refer to “Additional trunking options” on page 404.
Link aggregation parameters
You can change the settings on individual ports for the following link aggregation parameters:
• System priority
• Port priority
• Timeout
• Key
System priority
The system priority parameter specifies the link aggregation priority on the Dell PowerConnect
device, relative to the devices at the other ends of the links on which link aggregation is enabled. A
higher value indicates a lower priority. You can specify a priority from 0 – 65535. The default is 1.