NOTE: If you have configured the no mac-address-table station-move refresh-arp command, traffic continues tobe forwarded to the failed NIC until the ARP entry on the switch times out.Figure 72. Configuring the mac-address-table station-move refresh-arp CommandConfigure Redundant PairsNetworks that employ switches that do not support the spanning tree protocol (STP) — for example, networks with digital subscriber lineaccess multiplexers (DSLAM) — cannot have redundant links between switches because they create switching loops (as shown in thefollowing illustration). The redundant pairs feature allows you to create redundant links in networks that do not use STP by configuringbackup interfaces for the interfaces on either side of the primary link.NOTE: For more information about STP, refer to Spanning Tree Protocol (STP).Assign a backup interface to an interface using the switchport backup command. The backup interface remains in a Down state untilthe primary fails, at which point it transitions to Up state. If the primary interface fails, and later comes up, it becomes the backup interfacefor the redundant pair. Dell Networking OS supports Gigabit, 10 Gigabit, and 40-Gigabit interfaces as backup interfaces.Apply all other configurations to each interface in the redundant pair such that their configurations are identical, so that transition to thebackup interface in the event of a failure is transparent to rest of the network.Layer 2 503
