Ptx5000 Packet Forwarding Engine Architecture - Juniper PTX5000 Hardware Manual

PTX5000 Packet Transport Router Hardware Guide
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PTX5000 Packet Forwarding Engine Architecture

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10
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
packet forwarding, route lookups, and Layer 2 and Layer 3 packet switching. See
"PTX5000 Packet Forwarding Engine Architecture" on page 10
The Routing Engines and the Packet Forwarding Engines perform their primary tasks
independently, but communicate through multiple links. This arrangement streamlines
forwarding and routing control and runs Internet-scale backbone networks at high speeds.
PTX5000 Packet Transport Router Description on page 3
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 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 router.
Queuing and Memory Interface ASICs (TQ), which manage the buffering of data cells
in memory and the queueing of notifications.
The fabric ASICs (TF), located on the switch interface boards (SIBs), extract the route
lookup key and manage the flow of data cells across the switch fabric.
PTX5000 Packet Transport Router Description on page 3
PTX5000 System Architecture Description on page 9
for more information.
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