Which layer of the spn architecture does sr belong to?

SPN technology architecture includes slice packet layer (SPL), slice channel layer (SCL), slice transport layer (STL), as well as clock/time synchronization function module and SDN control function module.

Slice Packet Layer (SPL):

It can realize the bearer pipeline encapsulation and addressing forwarding of IP, Ethernet, CBR and other services, providing Carrying capabilities for multiple service types such as L2VPN, L3VPN, CBR transparent transmission, etc.

For packet services, The SPL layer supports SR-TP tunnels enhanced based on Segment Routing, while providing connection-oriented and connectionless multi-type bearer pipes.

Slicing channel layer (SCL):

Provides end-to-end hard isolation channels for network services and slicing services. Based on Ethernet PCS layer 66B cross-connection technology, it can significantly reduce latency. The forwarding delay of hop devices is 1~10us, which is an order of magnitude lower than the delay of traditional packet switching equipment.

Innovate the Ethernet channel layer OAM mechanism. By replacing the Idle block and inserting OAM, the end-to-end monitoring of the channel layer is realized. The OAM monitoring period can reach a minimum of hundreds of us, meeting the needs of high-reliability service transmission; SCL can provide end-to-end monitoring. End-based Ethernet TDM isolated links support network topology reconstruction and slicing to meet the ultra-low latency and hard isolation slicing requirements of 5G services.

Slicing transport layer (STL):

The slicing transport layer is based on IEEE 802.3 Ethernet physical layer technology and WDM-based simplified optical branch multiplexing (OADM) technology to achieve efficient large-scale transmission. Bandwidth transmission capability; by introducing the G.mtn segment layer function, the decoupling of MAC and PHY is achieved, and flexible correspondence between MAC and PHY is supported.

It can realize multiple PHY binding and realize high-speed Ethernet interface on the basis of low-cost and low-speed optical modules. For applications with higher requirements on bandwidth scalability and transmission distance, SPN adopts Ethernet Network DWDM technology enables large-capacity long-distance networking applications with 10T level capacity and hundreds of kilometers.

SDN control platform with integrated management and control:

Based on the design idea of ​​"integrated management and control, with centralization as the main focus and distribution as the supplement", it enhances business dynamic capabilities through the SDN centralized control plane and adopts a cloud platform Constructing an SDN controller can control the scale of network nodes reaching hundreds of thousands.

Introduce mature Netconf, PCEP and BGP-LS technologies in terms of interfaces, support SR-TP by extending PCEP to realize SDN flexible service creation of new SR-TP services, and support multi-layer and multi-domain collaboration mechanisms. , further improving the ability to integrate management and control.

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