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CHAPTER 1
JCS1200 Chassis and T Series Routers as
a Single Platform
Product Overview
JCS1200 Chassis and T Series Core Routers as a Single Platform
Copyright © 2010, Juniper Networks, Inc.
Product Overview on page 3
The JCS1200 chassis and T Series routers as a single platform include the following
components and product benefits:
JCS1200 Chassis and T Series Core Routers as a Single Platform on page 3
Root System Domains on page 4
Protected System Domains on page 4
Shared Interfaces on page 5
Inter-PSD Forwarding Overview on page 8
Route Reflection Overview on page 8
Connections Between JCS1200 and T Series Chassis on page 11
Benefits of JCS1200 and T Series as a Single Platform on page 13
The Juniper Networks JCS1200 Control System (JCS) chassis interconnected with up to
three T Series routing chassis enables the control plane (route processing) and forwarding
plane (packet forwarding) to be scaled independently within a single platform. The
JCS1200 chassis houses up to 6 redundant Routing Engine pairs or up to 12 single Routing
Engines running Junos OS. Matched with one or more Flexible PIC Concentrators (FPCs)
on a T Series router, the selected Routing Engine pair (or single Routing Engine) forms a
secure, virtual hardware router, or Protected System Domain (PSD). A PSD has the same
capabilities as a separate, physical router with its own control plane, configuration file,
routing tables, interfaces, and secure access.
Existing Juniper Networks technology already separates the tasks of the Routing Engine
from the Packet Forwarding Engine on a single routing platform. Each component
performs its primary tasks independently, while constantly communicating through a
high-speed internal link. This arrangement provides streamlined forwarding and routing
control and the capability to run Internet-scale networks at high speeds. Now, with
Routing Engines located in a separate chassis, the JCS1200 platform provides a greatly
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