Users Guide

Stacking LAG
When you use multiple links between stack units, Dell Networking Operating System automatically bundles them in a stacking link
aggregation group (LAG) to provide aggregated throughput and redundancy. The stacking LAG is established automatically and
transparently by operating system (without user conguration) after peering is detected and behaves as follows:
• The stacking LAG dynamically aggregates; it can lose link members or gain new links.
• Shortest path selection inside the stack: if multiple paths exist between two units in the stack, the shortest path is used.
Stacking VLANs
When you congure an Aggregator to operate in stacking mode (Conguring and Bringing Up a Stack), VLANs are recongured as
follows:
• If an Aggregator port belonged to all 4094 VLANs in standalone mode (default), all VLAN membership is removed and the port is
assigned only to default VLAN 1. You must congure additional VLAN membership as necessary.
• If you had manually congured an Aggregator port to belong to one or more VLANs (non-default) in standalone mode, the VLAN
conguration is retained in stacking mode only on the master switch.
When you recongure an Aggregator from stacking to standalone mode:
• Aggregator ports that you manually congured for VLAN membership in stacking mode retain their VLAN conguration in
standalone mode.
• To restore the default auto-VLAN mode of operation (in which all ports are members of all 4094 VLANs) on a port, enter the
auto vlan command; for example:
Dell(conf)# interface tengigabitethernet 0/2
Dell(conf-if-te-0/2)# auto vlan
Stacking
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