Reference Guide

Figure 56. Configuring the mac-address-table station-move refresh-arp Command
Configure Redundant Pairs
Configuring redundant pairs is supported on the Z9000 platform.
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 Spanning Tree Protocol (STP).
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. FTOS 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 the backup interface in the event of a failure is transparent to rest of the network.
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