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Updated:December 24, 2013
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® CRS-1 Carrier Routing System is the industry's first carrier router offering continuous system operation, unprecedented service flexibility, and system longevity. The Cisco CRS-1 is powered by Cisco IOS
® XR Software-a unique, self-healing, distributed operating system designed for always-on operation that scales system capacity up to 92 terabits per second (Tbps). The innovative system architecture combines the Cisco Silicon Packet Processor, the first programmable 40-Gbps application-specific integrated circuit (ASIC), with the Cisco Service Separation Architecture for outstanding service flexibility and speed to service. The Cisco CRS-1 marks a new era in carrier IP Communications by powering the foundation for network and service convergence today while protecting investments for decades to come.
The Cisco CRS-1 Distributed Route Processor (DRP) brings a new level of control plane scaling and processing flexibility to service provider networks. Breaking through the limitation of a single control plane processor per routing system, this solution allows you to add multiple Cisco CRS-1 DRPs to a single CRS system to increase control plane processing power, supporting more services and enhancing reliability. The Cisco CRS-1 DRP takes advantage of Cisco IOS XR Software capability and delivers distributed control plane scaling for applications such as Border Gateway Protocol Version 4 (BGPv4), Label Distribution Protocol (LDP), Protocol Independent Multicast (PIM), and Internet Group Management Protocol (IGMP). This solution allows you to distribute these application processes to specific DRPs across a Cisco CRS-1 Multishelf System - for instance, you can dedicate one or more DRPs to PIM and IGMP for maximum performance in an IPTV service application.
The Cisco CRS-1 DRP is also a prominent part of the Cisco Service Separation Architecture (SSA), which allows service providers to secure virtual public and private services across the same platform through multiple secure domain routers (SDRs), logical routing domains that achieve complete separation of network and system resources on a single CRS-1 system.
The Cisco CRS-1 Distributed Router Processor (CRS-DRP-B) fits into a forwarding slot of the CRS chassis. It consists of two modules, the CRS-DRP-B-CPU board that hosts the two dual processor SMP complexes and the CRS-DRP-PLIM board that hosts the access to management, auxiliary and console ports and accessories such as the hard drive. Both modules are required for DRP operation and are shown Figure 1.
The Cisco CRS-1 Distributed Route Processor is comprised of two independent CPU instances. Each CPU instance has its own memory, hard drive, and management interfaces. To maintain service separation, there is no internal connectivity between these two CPU complexes. The CPU instances can communicate with each other through the fabric, as they would with any other line card, route processor, or DRP located in the CRS system.
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For more information about the Cisco CRS-1 DRP, contact your local Cisco account representative or visit Cisco at