CHAPTER 2
PTX5000 Packet Transport Switch
System Architecture Overview
•
PTX5000 System Architecture Description on page 7
•
PTX5000 Packet Forwarding Engine Architecture on page 7
PTX5000 System Architecture Description
The PTX Series Packet Transport Switches have two main architectural components:
•
Routing Engine—One or more Routing Engines provide Layer 3 routing services and
network management.
•
Packet Forwarding Engines—These high-performance, ASIC-based components provide
Layer 2 and Layer 3 packet switching, route lookups, and packet forwarding.
The Routing Engines and the Packet Forwarding Engines perform their primary tasks
independently, although they constantly communicate through multiple 100-Mbps links.
This arrangement streamlines forwarding and routing control and runs Internet-scale
backbone networks at high speeds.
Related
Documentation
PTX5000 Packet Transport Switch Description on page 3•
• PTX5000 Packet Forwarding Engine Architecture on page 7
PTX5000 Packet Forwarding Engine Architecture
The Packet Forwarding Engines provide Layer 2 and Layer 3 packet switching, forwarding,
and route lookup functions.
The Packet Forwarding Engines are implemented in ASICs that are physically located
on the FPCs. Each FPC contains four Packet Forwarding Engines. Each Packet Forwarding
Engine consists of the following components:
•
Lookup ASICs (TL), which provide the route lookup function, control functions, Layer
2 and Layer 3 encapsulation and de-encapsulation, and manage the division and
reassembly of packets within the packet transport switch.
7Copyright © 2012, Juniper Networks, Inc.
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