Reference Guide

Layer 2 | 551
Figure 29-2. Configuring mac-address-table station-move refresh-arp Command
Configuring Redundant Pairs
Configuring Redundant Pairs is supported on the S5000 switch.
Networks that employ switches that do not support Spanning Tree (STP) — for example, networks with
Digital Subscriber Line Access Mutiplexers (DSLAM) — cannot have redundant links between switches
because they create switching loops (Figure 29-3). The Redundant Pairs feature enables 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.
Assign a backup interface to an interface using the command
switchport backup. The backup interface
remains in 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. Dell Networking
OS supports Gigabit, 10-Gigabit, and 40-Gigabit interfaces as backup interfaces.
You must 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.
Note: For details on STP, see Chapter 50, “Spanning Tree Protocol (STP),” on page 889.
MAC: A:B:C:D:E:F
IP: 1.1.1.1
fnC0026m
p
D:E:F
D
X
Port 0/1
Port 0/5
Move MAC
address
Active Link
m
ac-address-table station-move refresh-arp
configured at time of NIC teaming