Configure Redundant Pairs - Dell C9000 Series Networking Configuration Manual

NOTE: If you have configured the no mac-address-table station-move refresh-arp command,
traffic continues to be forwarded to the failed NIC until the ARP entry on the switch times out.
Figure 70. Configuring the mac-address-table station-move refresh-arp Command

Configure Redundant Pairs

Networks that employ switches that do not support the spanning tree protocol (STP) — for example,
networks with digital subscriber line access multiplexers (DSLAM) — cannot have redundant links between
switches because they create switching loops (as shown in the following illustration).
The redundant pairs feature allows you to create redundant links in networks that do not use STP by
configuring backup interfaces for the interfaces on either side of the primary link.
NOTE: For more information about STP, refer to
Assign a backup interface to an interface using the switchport backup command. The backup interface
remains in a Down state until the primary fails, at which point it transitions to Up state. If the primary interface
fails, and later comes up, it becomes the backup interface for the redundant pair. The system supports 10
Gigabit and 40-Gigabit interfaces as backup interfaces.
Spanning Tree Protocol (STP).
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