If a software-defined CPE is deployed, the operator gains the ability to evolve the guest access network through software upgrades. During the non-SDN era, the CPE functions as a traditional PTN or IP RAN device. However, when SDN becomes necessary, the CPE can be upgraded to support OpenFlow, transforming it into an SDN-enabled device. Looking ahead, further evolution could see the CPE transition into a virtualized vCPE that supports NFV, offering even greater flexibility and scalability.
To effectively implement a software-defined CPE, the ideal solution is an SDN-friendly access network processor. Why? Because such a processor offers superior flexibility, programmability, and the ability to be customized and upgraded in the field. A processor designed specifically for the access network must balance functionality, performance, power consumption, and cost from the access network's perspective. Its architecture should be SDN-friendly, meaning it supports flexible data flow operations that closely align with OpenFlow’s pipeline model.
PMC’s WinPath access network processor is ideally suited for building a software-defined CPE. This is due to several key architectural features:
- The basic processing unit combines a programmable search engine and a network processor engine, emulating the “match-action†structure of an OpenFlow switch.
- The programmable search engine accelerates lookups and supports multi-level and multi-type searches.
- The network processor engine uses a symmetric multi-core, multi-threaded architecture to enable hardware arbitration and load balancing.
- It allows loopback and iteration of basic processing units, enabling flexible design of complex forwarding processes.
- It minimizes pipeline restrictions on hard-coded, specific functions, allowing for more dynamic operation.
[Image: How to Implement Software-Defined CPE? (Image link)]
Looking ahead, operators aim to virtualize network functions, replacing traditional enterprise IT gateways or routers with cloud-based servers. This shift would eliminate the need for on-site IT infrastructure within enterprises. To build trust, the software-defined CPE must include a security engine capable of handling encryption and supporting future network virtual functions. These capabilities can be achieved using PMC’s WinPath access network processor.
PMC believes that implementing SDN in the guest access network will unlock the full potential of SDN, enabling operators to offer more services and generate higher revenue. Adopting SDN requires innovative hardware, and using a programmable network processor to build a software-defined CPE is currently the best approach. With its advanced features and flexibility, the WinPath processor is well-positioned to meet the evolving needs of modern networks.
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