Comcast today said it deployed Trellis, the Open Networking Foundation’s (ONF) open source SDN fabric, in “multiple markets.”

Trellis is an SDN-based, multi-purpose spine-leaf switching fabric designed for access-and-edge networks, NFV, and edge cloud applications. It use the Open Network Operating System (ONOS) open source SDN controller, the OpenFlow protocol, and white box switches.

The move is part of part of Comcast’s Distributed Access Architecture (DAA) buildout, and ONF announced the news today at its Connect event — after teasing the roll out earlier in the week.

During his opening keynote, AT&T’s chief technology officer Andre Fuetsch said one of the “largest tier-one operators” deployed the platform in production. While he didn’t name the operator, Comcast has led the work on the open source platform. Additionally, along with AT&T, Deutsche Telekom, and Infosys, Comcast authored a reference design for Trellis in April.

By using Trellis, Comcast says it improved network scalability as well as space and power facility efficiencies in its head-ends. As part of its next generation access strategy, Comcast is deploying open source and a white box-based ethernet backhaul, and the operator says Trellis plays a central role in this architecture. The DAA specification calls for an ethernet-based converged interconnect network (CIN), and Comcast is using Trellis in this CIN role.

“This has been a multiple year journey from design, to extensive field trails and finally to production rollout, and we’re impressed with the results and the advantages that using open source and Trellis are delivering for us as we upgrade our access network,” said Comcast’s Elad Nafshi, senior vice president of next generation access networks, in a statement.

Also at this week’s ONF Connect event, Arthur D. Little, AT&T, Deutsche Telekom, and Telefónica released a study that found virtualized, cloud-based architectures can save operators 40% in capex and 25% in opex.