Monitoring Key Router Components; Understanding Key Router Components - Juniper M Series Monitoring And Troubleshooting Manual

CHAPTER 4

Monitoring Key Router Components

Understanding Key Router Components

Copyright © 2012, Juniper Networks, Inc.
You monitor the key router components—the Routing Engine and the Packet Forwarding
Engine—to ensure that the router is handling general routing operations and is forwarding
packets properly. This chapter provides an overview of the these components and
includes the following information:
Understanding Key Router Components on page 119
Packet Forwarding Engine on page 120
Data Flow Through the Router Packet Forwarding Engine on page 122
Routing Engine on page 137
For information about what components comprise the Packet Forwarding Engine on
each routing platform, see
Understanding Key Router Components on page 119
Packet Forwarding Engine on page 120
Data Flow Through the Router Packet Forwarding Engine on page 122
Routing Engine on page 137
Inspect the Routing Engine and the Packet Forwarding Engine to ensure that the router
is handling general routing operations and is forwarding packets properly.
The router consists of two major architectural components:
"Packet Forwarding Engine" on page
integrated circuit (ASIC)-based component provides Layer 2 and Layer 3 packet
switching, route lookups, and packet forwarding.
"Routing Engine" on page
management.
The Packet Forwarding Engine and the Routing Engine perform their primary tasks
independently, although they constantly communicate through a 100-Mbps internal link.
This arrangement provides streamlined forwarding and routing control and the capability
"Packet Forwarding Engine" on page
120—This high-performance, application-specific
137—Provides Layer 3 routing services and network
120.
119