Deployment Guide
MAC Addressing
All port interfaces in the stack use the MAC address of the management interface on the master switch. The MAC address of the chassis
in which the master Aggregator is installed is used as the stack MAC address.
The stack continues to use the master’s chassis MAC address even after a failover. The MAC address is not refreshed until the stack is
reloaded and a dierent unit becomes the stack master.
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 conguration) 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 congure an Aggregator to operate in stacking mode (Conguring and Bringing Up a Stack), VLANs are recongured 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 congure additional VLAN membership as necessary.
• If you had manually congured an Aggregator port to belong to one or more VLANs (non-default) in standalone mode, the VLAN
conguration is retained in stacking mode only on the master switch.
When you recongure an Aggregator from stacking to standalone mode:
• Aggregator ports that you manually congured for VLAN membership in stacking mode retain their VLAN conguration 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
244
Stacking