•
Processing of routing protocol packets—The Routing Engine handles all packets that
concern routing protocols, freeing the Packet Forwarding Engine to handle only packets
that represent Internet traffic.
•
Software modularity—Because each software process is devoted to a different function
and uses a separate process space, the failure of one process has little or no effect on
the others.
•
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 (for example, prefix,
prefix lengths, and BGP attributes).
•
Scalability—The Junos routing tables have been designed to hold all the routes in
current networks with ample capacity for expansion. Additionally, the Junos OS can
efficiently support large numbers of interfaces and virtual circuits.
•
Management interface—Different levels of system management tools are provided,
including the Junos OS command-line interface (CLI), the Junos XML management
protocol, the craft interface, 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.
•
Monitoring efficiency and flexibility—The router supports functions such as alarm
handling and packet counting on every port, without degrading packet-forwarding
performance.
The Routing Engine constructs and maintains one or more routing tables (see
Figure 2 on page 6). From the routing tables, the Routing Engine derives a table of active
routes, called the forwarding table, which is then copied into the Packet Forwarding
Engine. The design of the ASICs allow the forwarding table in the Packet Forwarding
Engine to be updated without interrupting forwarding performance.
Figure 2: Control Packet Handling for Routing and Forwarding Table
Updates
Copyright © 2017, Juniper Networks, Inc.6
T640 Core Router Hardware Guide
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