This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.
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This blog will continue to include questions, troubleshooting scenarios, and references to existing and new technologies but will grow to include a variety of different platforms and technologies. Currently I have created over 185 questions/answers in regards to the CCIE R&S track!! Note: answers are in the comment field or within "Read More" section.

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Thursday, June 16, 2011

JunOS - Control and Forwarding Plane

JunOS separates the control plane and the forwarding (data) plane. The control plane contains the processes that control routing and switching protocols and the forwarding plane processes and forwards the frames and/or packets.

Routing Engine (RE): responsible for performing protocol updates and system management. JunOS runs these protocols and processes in protected memory. RE maintains the routing tables, bridging table, and the primary forwarding table which connects to the Packet Forwarding Engine (PFE)

Packet Forwarding Engine (PFE): Runs on ASICs for increased performance. PFE is focused on forwarding operations and not protocol updates and system management which provides reliability and high performance. The forwarding table (FT) is recieved from the RE through an internal link.

This architecture allows for high availability features such as graceful routing engine switch-over (GRES), nonstop active routing (NSR), unified in-service software upgrades (ISSU).

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