Device state awareness method, system and switch based on protocol non-aware forwarding
A protocol-aware, device-status technology, applied in the field of network communication, can solve problems such as limiting the programming flexibility of the SDN forwarding plane, POF cannot support the flow control mechanism, etc., and achieve the effect of enhancing programmability and intelligence
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Embodiment 1
[0058] The invention discloses a POF-based device state perception system. The system is applicable to the SDN architecture and includes an SDN controller and an SDN switch. The controller and the switch deliver the mapping relationship between state parameters and SPF through the SDN southbound interface and the flow table configured with SPF as the matching domain. When the data flow arrives, the switch extracts the state parameter according to the state parameter field configured in the flow table, matches the flow table entry, and applies the corresponding traffic forwarding policy; on the basis of the existing matching field of POF, by adding The state parameter field (SPF, State Parameter Field) realizes the perception of the real-time state of the forwarding device, such as the remaining space of the queue, port state, system clock and other information.
[0059] Such as figure 1 As shown, Embodiment 1 of the present invention provides a device state awareness system b...
Embodiment 2
[0079] Embodiment 2 of the present invention provides a POF-based device state awareness method, comprising the following steps:
[0080] Step 1) the controller configures the mapping relationship between the state parameter and the SPF ID, and configures SPF as the matching domain of the flow table;
[0081] Step 2) at the switch end, allocate storage space for SPF;
[0082] The state parameter field (SPF) is defined by (ID, {offset, length}) tuple, where the ID can identify the matching field type as SPF, which can be distinguished from the packet header field and metadata field; the SPF ID and device state parameters can be It is a one-to-one mapping, and it can also be a one-to-many mapping. An SPF can be divided into multiple sub-parameter domains through {offset, length}; where, the offset refers to the offset relative to the start address of the SPF, The unit can be bit or byte; the length is the length of the subparameter field, and the unit can be bit or byte.
[00...
Embodiment 3
[0106] How to realize the time-based traffic filtering mechanism (PSFP, Per-Stream Filtering and Policing) of the Time-Sensitive Network (TSN, Time-Sensitive Network) based on the present invention will be further described below in conjunction with the accompanying drawings.
[0107] Such as image 3 As shown, a typical POF logical switch is composed of a management unit and a forwarding unit. The management unit is mainly responsible for status information monitoring and system resource management, and the status monitoring module can be divided into independent status monitoring modules such as memory management and port status management. The forwarding unit is mainly responsible for table lookup and forwarding. Information exchange can be performed between the management unit and the forwarding unit through shared memory.
[0108] When the switch-side system is initialized, part of the shared memory is reserved as the state parameter field (SPF), such as Figure 4 As s...
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