Configuring Redundant Pairs - Dell Force10 S4810P Configuration Manual

Configuring Redundant Pairs

Configuring Redundant Pairs
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
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 details on STP, see
Assign a backup interface to an interface using the command
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. FTOS 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
to rest of the network.
Figure 29-6. Configuring Redundant Layer 2 Pairs without Spanning Tree
FTOS(conf-if-gi-3/41)#switchport
FTOS(conf-if-gi-3/41)#switchport backup gi 3/42
FTOS(conf-if-gi-3/41)#no shutdown
632
| Layer 2
is supported on platforms:
Chapter 49, "Spanning Tree Protocol (STP)," on page
, so that transition to the backup interface in the event of a failure is transparent
identical
Redundant links create a switching loop.
Without STP broadcast storms occurs.
Use backup interfaces to create redundant
links in networks without STP
R3
3/42
FTOS(conf-if-gi-3/42)#switchport
FTOS(conf-if-gi-3/42)#no shutdown
e c s
(Figure 29-6). The Redundant Pairs feature enables you to create
FTOS(conf-if-gi-4/31)#switchport
FTOS(conf-if-gi-4/31)#no shutdown
R4
3/41 4/31
Backup Link
4/32
FTOS(conf-if-gi-4/32)#switchport
FTOS(conf-if-gi-4/32)#no shutdown
Z
1003.
. The backup interface
switchport backup
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