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A data packet and forwarding device technology, applied in the field of communication, can solve the problem of reducing the forwarding efficiency of SFF
Active Publication Date: 2020-10-16
HUAWEI TECH CO LTD
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[0004] In order to realize the forwarding of data packets in the service chain, the SPI flow table corresponding to the path of each service chain in the prior art needs to be stored on all the SFFs corresponding to the path. When there are a large number of service chains in the network, it will cause There are many entries in the forwarding table on SFF, searching for a large number of entries will reduce the forwarding efficiency of SFF
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example 2
[0084] Assume that all SF nodes support NSH encapsulation, such as Figure 6 As shown, there are two service chain paths whose head and tail overlap but the middle part does not overlap.
[0085] From Figure 6 It can be seen from the RSP in the figure that the two service chain paths of SPI2 and SPI3 are only different in the middle path (the same part is shown in bold). In the prior art, even if two paths overlap, each path will be stored in the forwarding table stored in SFF correspondingly, such as Figures 5a-5c As shown, there will be a problem of many entries in the forwarding table.
[0086] based on Figure 6 For the service chain path shown, the forwarding tables generated by SFC for SFF212, SFF213 and SFF214 are as follows Figure 6a , Figure 6b and Figure 6c shown.
[0087] Figure 6a to Figure 6c The path of SPI2 is fully recorded in , so I won’t go into details here, and combine it below Figure 6a to Figure 6c Detailed description of SPI3:
[0088] e...
example 3
[0093] Assume that all SF nodes support NSH encapsulation, such as Figure 7 shown in Figure 4 In the shown structure, there may be two service chain paths whose headers overlap.
[0094] From Figure 7 It can be seen from the RSP in that the two service chain paths of SPI4 and SPI5 are only different in the tail path (the same part is shown in bold). In the prior art, even if two paths overlap, the forwarding table stored in the SFF will store each path correspondingly, which will cause the problem of many forwarding table entries as shown in Example 1.
[0095] based on Figure 7 For the service chain path shown, the forwarding tables generated by SFC for SFF212, SFF213 and SFF214 are as follows Figure 7a , Figure 7b and Figure 7c shown.
[0096] Figure 7a to Figure 7c The path of SPI4 is fully recorded in , so I won’t go into details here, and combine it below Figure 7a to Figure 7c Detailed description of SPI5:
[0097] according to Figure 7a For the SFF2...
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Abstract
The embodiments of the present application relate to the field of communication technologies, and in particular to a data packet forwarding method and device, which are used to reduce forwarding table entries on the SFF and improve the forwarding efficiency of the SFF. In the embodiment of the present application, the first SPI, SI and second SPI are encapsulated in the NSH of the data message, wherein the first SPI indicates the first service chain path currently forwarding the data message; the second SPI indicates the service chain control path. The second service chain path specified by the device for the service chain where the data packet is located, the first service path and the second service path partially overlap. In the embodiment of the present invention, the overlapping part of the first service chain path and the second service chain path is indicated by the first SPI, so as to realize the multiplexing of the path information in the forwarding table, thereby reducing the number of entries in the forwarding table, and further reducing the number of forwarding table entries. memory usage.
Description
technical field [0001] The embodiments of the present application relate to the communication field, and in particular, to a method and device for forwarding data packets. Background technique [0002] With the increase of service types of operators, in order to support better service experience, it is necessary to deploy a service routing network in the network, and a service function chaining (Service Function Chaining, SFC) technology is proposed. This technology provides the basis for flexible business processing by linking multiple business functions. The SFC technology classifies the service flow through the service classifier (Service Classifier, SC), and then forwards the data packets of the service chain along the pre-defined service chain path through the service function forwarder (Service Function Forwarder, SFF), The tail end forwards the message to the service chain tail server (Post Service, PS). [0003] Network Service Header (Network Service Header, NSH) ...
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