Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 552

Apply all other configurations to each interface in the redundant pair such that their configurations are identical, so that transition to the backup interface in the event of a failure is transparent to rest of the network. Figure 69. Configuring Redundant Layer 2 Pairs without Spanning Tree You configure a redundant pair by assigning a backup interface to a primary interface with the switchport backup interface command. Initially, the primary interface is active and transmits traffic and the backup interface remains down. If the primary fails for any reason, the backup transitions to an active Up state. If the primary interface fails and later comes back up, it remains as the backup interface for the redundant pair. Dell Networking OS supports only Gigabit, 10 Gigabit, and 40-Gigabit ports and port channels as primary/ backup interfaces in redundant pairs. (A port channel is also referred to as a link aggregation group (LAG). For more information, refer to Interfaces) If the interface is a member link of a LAG, the following primary/backup interfaces are also supported: • primary interface is a physical interface, the backup interface can be a physical interface • primary interface is a physical interface, the backup interface can be a static or dynamic LAG • primary interface is a static or dynamic LAG, the backup interface can be a physical interface • primary interface is a static or dynamic LAG, the backup interface can be a static or dynamic LAG In a redundant pair, any combination of physical and port-channel interfaces is supported as the two interfaces in a redundant pair. For example, you can configure a static (without LACP) or dynamic (with 552 Layer 2