Dell PowerConnect J-8216, Hardware Manual

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Each fan tray continues to operate indefinitely and provide sufficient cooling even when
a single fan fails provided the room temperature is within the operating range. See
“Cooling System and Airflow in a J-EX8216 Switch” on page 44.
Routing Engine and Control Redundancy
Each RE module contains Routing Engine circuitry, and system control and management
circuitry. A redundant J-EX8216 switch has two RE modules. When a switch has two RE
modules, one functions as the master while the other functions as a backup and is in
standby mode. This provides the switch with full redundancy (1+1) for Routing Engine
and system control functionality.
Table 6 on page 13 lists the RE module slots in the J-EX8216 chassis and the Routing
Engine and associated system control redundancy.
Table 6: Routing Engine and System Control Redundancy for J-EX8216 Switches
Routing Engine and System
Control Redundancy
Slot RE1 Slot RE0 Switch Configuration
Yes RE module RE module Redundant configuration
Switch Fabric Redundancy
The switch fabric circuitry in a J-EX8216 switch is distributed across eight Switch Fabric
(SF) modules. We recommend that you install all eight SF modules in a J-EX8216 switch
to support maximum midplane performance for the installed line cards.
All SF modules are fully connected to all installed line cards. When the switch is
operational, all eight SF modules are simultaneously active. If a single SF module fails,
the input/output traffic for that module is load-balanced among the remaining SF
modules, providing graceful degradation in midplane performance. The impact of an SF
module failure on the performance of a J-EX8216 switch varies based on the type of line
cards installed in the switch and the traffic mix flowing through them. In a J-EX8216
switch configuration that is fully loaded with 8-port 10-Gigabit Ethernet SFP+ line cards,
if one SF module fails, the remaining seven SF modules still have sufficient switching
capacity to maintain continuous switch operation at full wire-rate performance.
Table 7 on page 13 lists the SF module slots in a J-EX8216 chassis and shows that switch
fabric redundancy is associated with the redundant switch configuration.
Table 7: Switch Fabric Redundancy for J-EX8216 Switches
Switch Fabric Redundancy Slots SF7 Through SF0 Switch Configuration
Yes SF modules installed in all slots Redundant configuration
Related
Documentation
Routing Engine (RE) Module in a J-EX8216 Switch on page 26
•
•
Switch Fabric (SF) Modules in a J-EX8216 Switch on page 29
13
Chapter 1: Dell PowerConnect J-Series J-EX8216 Switch Overview