Figure 3: Rear View of a Fully Configured DC-Powered Router Chassis
Related
Documentation
MX480 Router Description on page 3•
• MX480 Midplane Description on page 26
• MX480 Router Physical Specifications on page 119
MX480 Component Redundancy
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 functioning together
with 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.
If the Routing Engines are configured for graceful switchover, the backup Routing Engine
automatically synchronizes its configuration and state with the master Routing Engine.
Any update to the master Routing Engine state is replicated on the backup Routing
Engine. If the backup Routing Engine assumes mastership, packet forwarding continues
throughthe router without interruption. For more information about graceful switchover,
see the Junos OS Administration Library.
•
Power supplies—In the low-line (110 V) AC power configuration, the router contains
three or four AC power supplies, located horizontally at the rear of the chassis in slots
11Copyright © 2017, Juniper Networks, Inc.
Chapter 3: Chassis Components and Descriptions
To Next Page
Loading...
Need help?
General
