The Routing Engine consists of the following components. For
more information, see Software Overview.
- Processor—Creates the packet forwarding switch fabric
for the router and runs JUNOS software to maintain the router's routing
tables and routing protocols.
- DRAM—Buffers incoming packets and provides storage
for the routing and forwarding tables and for other Routing Engine processes.
To view the amount of DRAM installed on your router, issue the show chassis routing-engine command.
- EPROM—Stores the serial number of the Routing Engine.
To view the serial number of the Routing Engine, issue either
the show chassis routing-engine command or the show chassis
hardware command.
- Crypto Accelerator
Module—Processor card that enhances performance of cryptographic
algorithms used in IP security (IPSec) services. The cryptographic
algorithms supported include Advanced Encryption Standard (AES), Data
Encryption Standard (DES), triple DES (3DES), Hashed Message Authentication
Code-Message Digest 5 (HMAC-MD5), and HMAC-Secure Hash Algorithm
1 (SHA-1). The Crypto Module is an optional feature of J2320 and J2350 Services Routers.
To determine whether there is a Crypto Accelerator Module installed
on your router, issue the show chassis hardware command.
- Compact flash—Provides primary storage for software
images, configuration files, and microcode. J-series routers have
a primary or internal compact flash located on the system board. For
information about replacing the internal compact flash, see Replacing Internal Compact Flashes on J2320 and J2350 Routers.
J2320 and J2350 Services Routers also provide a slot in the rear
of the chassis into which you can insert an additional external compact
flash. For information about external compact flashes, see J2320 and J2350 External Compact Flashes.