Mx960 Component Redundancy; Mx960 Router Hardware And Cli Terminology Mapping - Juniper MX960 Hardware Manual

MX960 3D Universal Edge Router Hardware Guide

MX960 Component Redundancy

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MX960 Router Hardware and CLI Terminology Mapping

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MX960 Router Grounding Specifications on page 145
A fully configured router is designed so that no single point of failure can cause the entire
system to fail. Only a fully configured router provides complete redundancy. All other
configurations provide partial redundancy. The following major hardware components
are redundant:
Host subsystem—The host subsystem consists of a Routing Engine and an SCB. The
router can have one or two host subsystems. If two host subsystems are installed, one
functions as the master and the other functions as the backup. If the master host
subsystem (or either of its components) fails, the backup can take over as the master.
To operate, each host subsystem requires a Routing Engine installed directly into in
an SCB.
Power supplies—In the AC configuration with normal capacity AC power supplies, a
minimum of three power supplies is required to supply power to a fully configured
router. All AC power supplies share the load evenly. The addition of a fourth power
supply provides full power redundancy. If one power supply fails in a redundant
configuration, the three remaining power supplies provide full power. In the DC
configuration and the AC configuration with high capacity power supplies, two power
supplies are required to supply power to a fully configured router. One power supply
supports approximately half of the components in the router, and the other power
supply supports the remaining components. The addition of two power supplies
provides full power redundancy. If one or two power supplies fail, the remaining power
supplies can provide full power to the router.
Cooling system—The cooling system has redundant components, which are controlled
by the host subsystem. If one of the fans fails, the host subsystem increases the speed
of the remaining fans to provide sufficient cooling for the router indefinitely.
MX960 Router Overview on page 3
Displaying MX960 Router Components and Serial Numbers on page 507
Guidelines for Packing Hardware Components for Shipment on page 524
Returning a Hardware Component to Juniper Networks, Inc. on page 527
The MX960 router supports the components in Table 5 on page 13.
Copyright © 2017, Juniper Networks, Inc.