Table of Contents
The Evolution of the high-speed Routing
Let’s go back in time… ~early 1995
What was happening to the Internet?
What was happening to the routers?
What did we do about it?
What did we really do about it...
What is a Big Fast Router (BFR)?
New Technologies
New Technologies
New Technologies
Cisco Express Forwarding
Cisco Express Forwarding
Packet Flow Routing Updates
Packet Flow Data Packets
How do you build a router?
How do you build a router?
Gigabit Route Processor GRP
Distributed Buffering
Switch Fabric
Switch Fabric + VOQ
GSR Switch Fabric Architecture
Switch Fabric
Legacy(E0/E1/E2)- Fabric - OC192(E4) interface
Forwarding Engines
Forwarding Engines
Centralised vs. Distributed Forwarding
Memory Technology Refresher
Centralised vs. Distributed Forwarding
Centralised Forwarding - Major Problem
Forwarding Table Structures
Centralised vs. Distributed Forwarding
TCAM - Ternary Content Addressable Memory
Engine 0 Line Card
Engine 0
Engine 1 Line Card
Engine 1
Engine 2 Line Card
Engine 2 - Performance
Engine 4 Line Card
Engine 4
GSR Forwarding Architecture
GSR Forwarding Engine Evolution
Scaling
Scaling Issues
Scaling the GSR...
Summary
Questions?
PPT Slide
PPT Slide
Other Architecture Considerations...
Scaling Issues with Shared Memory Systems
Scaling Issues...
ASICS
How do you build a router?
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