Juniper Certification | JNCIA-JUNOS | Day-3 Routing Engine and Packet Forwarding Engine

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On this session we are going to learn about RE and PFE. Now lets look over Routing Engine (i.e., RE).

Routing Engine 

As we already discussed earlier, that RE is the brain of a platform and it is responsible for performing protocol updates and system management.

1. Routing Engine Intelligence Maintenance : 
The RE handles all protocol processes in addition to other software processes that control the devices interface, the chassis components, system management, and user access to the devices. These software processes run fon top of the Junos kernel, which interacts with the PFE. The software directs all protocol traffic from the network to the RE for the required processing.

2. Chassis Monitoring and Control : 

The RE provides in addition on the J-Web GUI. These user interface run on top of the Junos kernel and provides user access and control of the devices.

3. Packet Forwarding Engine Management : 
RE controls the PFE by providing accurate up-to-date Layer-2 and Layer-3 forwarding tables and by downloading microcode and managing software process that reside in the PFE's microcode. The RE receives hardware and environmental status message from th ePFE and acts upon them as appropriate.

Packet Forwarding Engine

This is know as PFE that a central processing component of the forwarding plane. The PFE systematically forwards traffic based on its local copy of the forwarding table is a synchronized copy of the information created on and also provided by RE. The storing and using a local copy of the forwarding table enables the PFE to forward traffic more effectively, and eliminates the need to consult RE each time a packet needs to be processed. Using local copy of the forwarding table also enables platforms by running the Junos OS to continue forwarding traffic during control plane instabilities.



The PFE also maintains Layer-2 bridging information. In addition to forwarding traffic, the PFE also implements a number of advanced services. In some examples like an advanced services implemented through the PFE which includes polices that provide rate limiting, stateless firewall filters, and class of services (CoS). In which that other services are available through special interface cards that you can add to the PFE complex.

Stay tuned for more information for juniper cert JNCIA-JUNOS preparation for exams.     

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