Juniper JUNOS - NETWORK OPERATION GUIDE REV1 User Manual

Understanding Key Router Components ! 105
Chapter 12: Monitoring Key Router Components
Figure 22: Routing Engine Architecture
Routing Engine Functions
The Routing Engine handles all the routing protocol processes, as well as other
software processes that control the router interfaces, system management, and
user access to the router. These routing and software processes run on top of a
kernel that interacts with the T-series Internet Processor in the Packet Forwarding
Engine.
The Routing Engine provides the following functions:
! Routing protocol packet processing—All routing protocol packets from the
network are directed to the Routing Engine, and hence do not delay the Packet
Forwarding Engine unnecessarily.
! Software modularity—By dividing the different software functions into separate
processes, the failure of one process is isolated from others and has little or no
effect on them.
! In-depth Internet functionality—Each routing protocol is implemented with a
complete set of Internet features and provides full flexibility for advertising,
filtering, and modifying routes. Routing policies are set according to route
parameters (such as prefix, prefix lengths, and BGP attributes).
! Scalability—The JUNOS routing tables are designed to hold all the routes in
current and imminent networks. Additionally, the JUNOS software efficiently
supports large numbers of interfaces and virtual circuits.
! Management interface—Different levels of system management practices are
provided, including a command-line interface (CLI) and SNMP.
! Storage and change management—Configuration files, system images, and
microcode can be held and maintained in primary and secondary storage
systems, permitting local or remote upgrades.
! Efficiency and flexibility monitoring—The router permits alarm handling and
packet counting. For example, the router allows information to be gathered on
every port, without adversely affecting packet forwarding performance.
JUNOS
software
System
management
processes
Routing
protocols
Control
functions
System processes
Operating system
Kernel
Intel-based PCI platform
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Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Specifications

General

Brand	Juniper
Model	JUNOS - NETWORK OPERATION GUIDE REV1
Category	Software
Language	English