Dynamic Packet Transport (DPT) offers the reliability and restorability associated with traditional transport technologies, such as SONET/SDH, but is optimized to carry IP traffic and applications. DPT uses a dual, counter-rotating fiber ring, which allows both fibers to concurrently transport data traffic and its corresponding control messages. DPT's Spatial Reuse Protocol (SRP) enables packet destination stripping as well as statistical multiplexing, dramatically increasing ring bandwidth use in a media-independent environment.

DPT combines the bandwidth-efficient and services-rich capabilities of IP routing with the bandwidth-rich, self-healing capabilities of traditional fiber rings to deliver fundamental cost and functionality advantages over existing solutions.

DPT Resources

	Spatial Reuse Protocol (SRP) Technology This paper describes SRP and ring technology, including the MAC layer definitions and the algorithms underlying ring bandwidth control and protection switching. It also covers implementation and initial Cisco product offerings.
	Dynamic Packet Transport Technology and Performance This paper describes DPT and its performance in various networking scenarios.
	Dynamic Packet Transport Technology and Applications This paper discusses the key business benefits of Dynamic Packet Transport for service providers.

Cisco Products Supporting DPT
To find out more about the Cisco platforms that support DPT, click on these links:

	Cisco ONS 15194 IP Transport Concentrator
	Cisco ONS 15190 IP Transport Concentrator
	Cisco 10720 Internet Router
	Cisco 12000 series Internet router
	Cisco 7500 series Router
	Cisco 7200 series Router