New H3c Technologies Co., Ltd.

Hewlett Packard Enterprise Development LP

Hangzhou H3c Technologies Co., Ltd

Changzhong Ge

Kai Ren

Shaoliang An

Dawei Xu

Jianming Song

A method and an apparatus for building a decision tree for packet classification are provided. According to an example of the present disclosure, a first type decision tree is generated by performing tree building for a classification rule set based on a non-template dimension of the classification rule set; a second type decision tree is generated by performing tree building for each leaf node in the first type decision tree based on a template dimension of the classification rule set; a plurality of leaf nodes that are mutually of the to each other in the first type decision tree are associated with a same second type decision tree. The plurality of leaf nodes that are SPSR to each other indicate that classification rule sets respectively included in the plurality of leaf nodes are SPSR to each other.

Building decision tree for packet classification

A Multibit Trie is created for routing distribution of IP prefixes in each Virtual Private Network (VPN); and each Multibit Trie is divided into multiple layers. When routing search is performed for an IP address of a VPN, an input key is generated for each layer respectively, the input key of the layer comprises a VPN identifier of the VPN and bits corresponding to all of at least one layer before the layer in the IP address. A calculation is performed for the generated input key of each layer by using a Hash function of the layer, and routing is searched for according to a data structure information pointer of a Sub_Trie node corresponding to a longest Hash hit result.

IP routing search

A Multibit Trie is created for routing distribution of IP prefixes in each Virtual Private Network (VPN). Routing of IP prefixes in the highest level 1&#x2dc;m of the Multibit Trie is expanded to IP prefixes in level m+1 according to a prefix expansion method, wherein m is an integer larger than 1. Each branch of the IP prefixes in the level m+1 of the Multibit Trie is taken as a Branch_Tree, and data structure information of each Branch_Tree is saved. When routing of an IP address in a VPN is to be searched, a Branch_Tree is searched in a Multibit Trie corresponding to the VPN according to the highest m+1 bits of the IP address, and the routing of the IP address is searched in the Branch_Tree.

A programming file including a first module is loaded to a programmable component. And then, the programmable component is dis-reset. Subsequently, first data is loaded to a memory connecting with the programmable component, to enable the first module in the programmable component to convert the first data of the memory into second data. After the first module of the programmable component converts the first data of the memory into the second data, a second module is loaded to the programmable component. The first module in the programming file is then replaced with the second module, to enable the second module to access the second data.

Initialize programmable components

The present invention provides a method and apparatus for packet transmission in the network. When the network device receives data packets from the first user, the network device extracts and saves the data encapsulated in the data packets and then forwards the packets according to the destination addresses of the data packets. When it receives the request from a second user for the data mentioned above, it encapsulates the saved data in data packets and sends the data packets to the second user. With the present invention deployed, the uploaded data packets are saved on network devices and can be directly transmitted to users requesting them. In this way, the present invention avoids repeated traffic upload, reduces upload traffic in the network, decreases network bandwidth occupied by traffic, and thus improves the overall network performance.

Growing community of inventors

Beijing, China

Changzhong Ge