Ptx5000 Routing Engine Description; Routing Engine Slots; Routing Engine Functions - Juniper PTX5000 Hardware Manual

PTX5000 Packet Transport Router Hardware Guide

PTX5000 Routing Engine Description

Routing Engine Slots

Routing Engine Functions

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Routing Engine Slots on page 76
Routing Engine Functions on page 76
RE-DUO-C2600-16G Routing Engine Components on page 77
RE-PTX-X8-64G Routing Engine Components on page 78
Routing Engine Boot Sequence on page 79
You can install one or two Routing Engines in the PTX5000 Packet Transport Router.
The Routing Engines install into the Control Boards labeled
Engines are installed, one functions as the master and the other acts as the backup. If
the master Routing Engine fails or is removed and the backup is configured appropriately,
the backup restarts and becomes the master.
The Routing Engine handles all routing protocol processes, as well as the software
processes that control the packet transport router's interfaces, the chassis components,
system management, and user access to the packet transport router. The routing and
software processes run on top of a kernel that interacts with the Packet Forwarding
Engine.
The Routing Engine constructs and maintains one or more routing tables. 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 allows
the forwarding table in the Packet Forwarding Engine to be updated without interrupting
forwarding performance.
The Routing Engine includes the following functions and features:
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—Junos OS routing tables have been designed to hold all the routes in current
networks with ample capacity for expansion. Additionally, Junos OS can efficiently
support large numbers of interfaces and virtual circuits.
and . If two Routing
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