Understanding J-Ex8216 Switch Component And Functionality Redundancy; Hardware Components That Provide Redundancy - Dell PowerConnect J-EX8216 Hardware Manual

Dell PowerConnect J-Series J-EX8216 Ethernet Switch Hardware Guide

Understanding J-EX8216 Switch Component and Functionality Redundancy

Hardware Components That Provide Redundancy

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Installing and Removing J-EX8216 Switch Hardware Components on page 113
The J-EX8216 Ethernet Switch is available as a fully redundant system. A redundant
J-EX8216 switch configuration is designed so that no single point of failure can cause the
entire switch to fail. See "J-EX8216 Switch Configurations" on page 7.
This topic describes:
Hardware Components That Provide Redundancy on page 12
Routing Engine and Control Redundancy on page 13
Switch Fabric Redundancy on page 13
The following hardware components provide redundancy to a J-EX8216 Ethernet switch:
Routing Engine (RE) modules—A redundant J-EX8216 switch has two RE modules.
When two RE modules are installed, one RE module functions as the master and the
other functions as the backup. If the master RE module fails or is removed, the backup
module takes over as the master RE module.
When the RE modules are configured for graceful switchover, the backup RE module
automatically synchronizes its configuration and state with those of the master RE
module. Any update to the master RE module is replicated on the backup RE module.
If the backup module assumes mastership, packet forwarding continues through the
switch.
Power supplies—You can install up to six AC power supplies in a J-EX8216 switch. Each
power supply connects to the midplane of the chassis, which distributes the output
power produced by the power supplies to different switch components. (See "Midplane
in a J-EX8216 Switch" on page 48.) Each power supply provides power to all the
components in the switch.
An N+1 power configuration is required for J-EX8200 switches. In an N+1 power
configuration, if one power supply fails or is removed, the remaining power supplies
continue to supply power for the entire system without interruption. If dual power feed
redundancy is required, the required power configuration is N+N. The maximum internal
power consumption for the J-EX8216 switch must be kept below 9000 W for a six
power supply configuration (3+3) when 3000 W AC power supplies are used. See "AC
Power Supply in a J-EX8200 Switch" on page 39.
Cooling system—The cooling system in a J-EX8216 switch consists of two identical
and interchangeable fan trays. Each fan tray has nine fans and two fan tray controllers.
The fans in each fan tray are controlled by the two fan tray controllers. The fans are
numbered 1 through 9. Fans 1 through 5 are controlled by the first fan tray controller.
Fans 6 through 9 are controlled by the second fan tray controller. If one fan tray
controller fails, the other fan tray controller keeps the remaining fans working. This
allows the switch to continue to operate normally.