WO2012106950A1 - Procédé de retransmission de paquets de services d'application au moyen de mpls et nœud de retransmission de celui-ci - Google Patents

Procédé de retransmission de paquets de services d'application au moyen de mpls et nœud de retransmission de celui-ci Download PDF

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Publication number
WO2012106950A1
WO2012106950A1 PCT/CN2011/078903 CN2011078903W WO2012106950A1 WO 2012106950 A1 WO2012106950 A1 WO 2012106950A1 CN 2011078903 W CN2011078903 W CN 2011078903W WO 2012106950 A1 WO2012106950 A1 WO 2012106950A1
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Prior art keywords
packet
service
server group
forwarding
node
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English (en)
Chinese (zh)
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王瑾
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
    • H04L67/63—Routing a service request depending on the request content or context
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers

Definitions

  • the present invention relates to MPLS (Multi-Protocol Label Switching) technology, and in particular to a method and a forwarding node for forwarding application service messages by using MPLS technology.
  • MPLS Multi-Protocol Label Switching
  • the PTN (Packet Transport Network) bearer network is used to carry multi-service and high-speed forwarding.
  • the end-to-end path of the service may be shortened.
  • China Telecom announced that it will fully support the V6 network in 2014.
  • the increasingly urgent demands of future network flattening trends and cloud computing put higher demands on the computing load capacity of network devices.
  • MPLS-TP Transport Profile for Multi-Protocol Label Switching
  • TMPLS Transport Multi-Protocol Label Switching
  • MPLS Multi-Protocol Label Switching
  • MPLS-TP Transport Profile for Multi-Protocol Label Switching
  • QOS Quality of Service
  • OAM Operaation Administration and Maintenance
  • NAT-PT Network Address Translation-Protocol Translation technology works on IP V4 and IPV6 network edge devices. All address translation processes are implemented on this device. It is transparent to IPV4 and IPV6 networks, ie users do not have to change the configuration of hosts in the current IPV4 network. The communication between the IPV6 network and the IPV4 network can be realized.
  • IP forwarding has disadvantages such as relying on the entire network routing, query routing table, and forwarding prefix length.
  • the present invention provides a method for forwarding application service packets by using MPLS technology and a forwarding node, so as to solve the problem that content exchange cannot be quickly forwarded.
  • the present invention provides a method for forwarding an application service by using MPLS technology, the method comprising:
  • the forwarding node receives the message
  • the forwarding node performs a multi-protocol label switching (MPLS) process on the received packet, where the forwarding label is the intermediate node (Transit) of the penultimate hop, and the original label in the packet is exchanged as a virtual label of the server group corresponding to the original label; when the forwarding node is an egress PE, the virtual label of the server group in the packet is popped up, where different virtual labels of the server group correspond to different labels.
  • MPLS multi-protocol label switching
  • the forwarding node forwards the processed packet, and when the forwarding node is an egress node, the packet forwarding is performed according to the server group information corresponding to the pop-up server group virtual label.
  • the method further includes: assigning a label to the forwarding node before the forwarding node receives the packet, and creating a service pseudowire, where different service pseudowires are bound to different service types;
  • the forwarding node When the forwarding node performs MPLS processing on the received packet, when the forwarding node is an ingress node, after receiving the packet, the packet is parsed according to the service information in the packet. Determine whether the service corresponding to the packet is bound to the service pseudowire, and the service is bound to the service pseudowire. Whether the switch is enabled; if the service corresponding to the packet is not bound to the service pseudowire or the service pseudowire is bound, but the service switch is not enabled, the packet is subjected to normal MPLS tunnel processing; If the service is bound to the service pseudowire and the service switch is enabled, the service pseudowire is selected according to the service information to determine the next hop label.
  • the forwarding node is an egress node, and the egress node is responsible for storing the correspondence between the virtual label of the server group and the server group information, where the server group information includes the MAC address of the server, and is reported according to the server group information corresponding to the virtual label of the server group that is popped up.
  • the steps for forwarding the text include:
  • the egress node queries the server group information according to the popped server group virtual tag; and the egress node balances the queried server group information according to the load balancing policy, and obtains the MAC address in the queried server group information, and according to the The obtained MAC address is forwarded.
  • the forwarding node is an egress node.
  • the method further includes: the egress node performs information replacement, URL replacement, or address proxy replacement on the received packet.
  • the present invention also provides another method for forwarding an application service message by using the MPLS technology, the method comprising:
  • the ingress PE receives the packet, inserts a label of the pseudowire corresponding to the packet, and forwards the packet.
  • the intermediate node receives the packet and forwards the packet.
  • the transit node of the penultimate hop exchanges the original label in the packet to the virtual label of the server group corresponding to the original label, and then forwards the different server groups.
  • the virtual label corresponds to different server group information
  • the egress PE receives the packet and ejects the virtual label of the server group in the received packet.
  • the packet is forwarded according to the server group information corresponding to the virtual label of the server group.
  • the egress node is responsible for storing the correspondence between the virtual label of the server group and the server group information, and the server group information includes the MAC address of the server.
  • the step of forwarding the packet according to the server group information corresponding to the virtual label of the pop-up server group includes:
  • the egress node queries the server group information according to the pop-up server group virtual tag; and the egress node balances the scheduled server group information according to the load balancing policy, and obtains The MAC address in the server group information that is queried, and forwarded according to the queried MAC address.
  • the present invention also provides a forwarding node that utilizes MPLS technology, and the forwarding node includes:
  • a message receiving module configured to receive a message
  • a packet processing module configured to perform a multi-protocol label switching (MPLS) process on the packet received by the packet receiving module, where when the forwarding node is an intermediate node (Transit) of the penultimate hop, The original label of the packet is exchanged with the virtual label of the server group corresponding to the original label.
  • MPLS multi-protocol label switching
  • a packet forwarding module configured to forward the packet processed by the packet processing module, where, when the forwarding node is an egress node, the server group corresponding to the virtual label of the server group popped up by the packet processing module Information is forwarded by the message.
  • the forwarding node further includes a service pseudowire creation module, a packet parsing and identification module, and a normal processing and forwarding module; wherein:
  • the service pseudowire creation module is configured to allocate labels, create service pseudowires, and bind different service pseudowires to different service types;
  • the message parsing and identifying module is configured to: when the forwarding node is an ingress node, parse the packet received by the packet receiving module, and determine, according to the service information in the packet, whether the service corresponding to the packet is tied.
  • the service pseudo-line is fixed, and the service switch is enabled when the service pseudo-line is bound, and when the service-binding service pseudo-line corresponding to the packet is determined and the service switch is enabled, the service pseudo-line is selected according to the service information. Determine the next hop label;
  • the normal processing forwarding module is configured to perform normal MPLS tunnel processing and forwarding on the packet when the service corresponding to the packet is not bound to the service pseudowire or the service pseudowire is bound but the service switch is not enabled.
  • the forwarding node is an egress node, and the egress node further includes:
  • the information table caching module is configured to save a correspondence between the virtual label of the server group and the server group information, where the server group information includes a MAC address of the server;
  • An information table querying module configured to query server group information according to a server group virtual label in the packet;
  • the load balancing module is configured to: according to the load balancing policy, balance the server group information queried by the scheduling information table query module, and obtain the MAC address in the server group information.
  • the present invention utilizes the existing MPLS technology for switching and forwarding, and the egress PE allocates different server group virtual labels for different application service service server groups.
  • the penultimate hop forwarding node will correspond.
  • the virtual label of the server group is used as the label of the last hop forwarding node (ie, the egress node), and is exchanged and forwarded.
  • the egress node directly obtains the MAC address of the corresponding server and forwards it, the switching capability of the application layer service can be improved.
  • the advantages of MPLS-TP technology label forwarding can be utilized, and the MPLS-TP pseudowire technology realizes fast directional forwarding of application services.
  • Figure 1 is a schematic diagram of conventional content exchange and load balancing
  • FIG. 2 is a schematic diagram of a method for forwarding an application service packet by using the MPLS technology according to the present invention
  • FIG. 4 is a schematic illustration of an embodiment of the method of the present invention.
  • the present invention utilizes existing MPLS technologies (including MPLS-TP, TMPLS, MPLS, etc.) for switching and forwarding, and the egress PE allocates different server group virtual labels for different application service service server groups in the MPLS exchange forwarding process.
  • the penultimate hop forwarding node uses the virtual label of the server group corresponding to the service as the label of the last hop forwarding node (ie, the egress node), and performs switching exchange, and then the egress node directly obtains the corresponding server according to the preset information table.
  • MAC Media Access Control
  • forwarding can improve the switching capability of the application layer service, especially in the directional forwarding, can take advantage of the MPLS-TP technology label forwarding, and realize the application through the MPLS-TP pseudowire technology. Fast directional forwarding of services.
  • Step 201 The forwarding node receives the packet.
  • the forwarding node referred to in the present invention may be an ingress node (PE), an intermediate node (Transit), or an egress (Egress PE).
  • PE ingress node
  • Transit intermediate node
  • Egress PE egress
  • the PSN (Packet Switched Network) tunnel between PE devices can be multiplexed into multiple internal tunnels.
  • This internal tunnel is also called Pseudo Wire (PW).
  • PW Pseudo Wire
  • the PW side indicates the VPN network side when the MPLS-TP technology is used for VPN networking.
  • the service load balance label space determines the size of the label space based on the sum of concurrent sessions allowed by various services.
  • the corresponding generated VCID space is called the service VCID space.
  • the scenario in which the pseudowire is bound to the service 1:1 that is, a pseudowire is bound to only one service.
  • the application services such as NAT-PT (IPV6), HTTP, HTTPS, EMAIL, and FTP create an independent pseudowire template, which carries the service type attribute, that is, the above service type.
  • the difference between a pseudowire template customized for a specific service and a normal pseudowire is that the label assigned to the normal pseudowire is a private network label generated according to a common VCID (Virtual Connection Identity) through LDP distribution or static allocation.
  • the labels used by the service pseudo-wires are generated based on the service VCID and are allocated from the service label control stack.
  • the LSPs (label switching paths) of the CO-ROUTED LSP and the ASSOCIATED LSP are supported. set. Label distribution for business pseudowires also supports dynamic and static methods.
  • Server Group Virtual Label and Service VCID is a special label space reserved for different services, and its management involves the allocation and release rules. Mainly after the reserved space is allocated and released on-demand.
  • the last hop service virtual label assigned to the service pseudowire that is, the virtual label of the egress node is allocated from the service load balancing label space.
  • the pseudo line layer does not perform the penultimate hop pop operation during the penultimate hop. Instead, it is exchanged for the server group virtual label, and each server group virtual label corresponds to a specific business server group.
  • the label assigned to the specific link (Session) is obtained from the service load balancing label space. Because it has the meaning of the service load balancing service and does not participate in the normal MPLS-TP forwarding exchange, it is also called the server group service virtual label.
  • Such tags are generated by the configured business VCID.
  • the packets of an AC received by the ingress PE will enter the same tunnel.
  • the inner layer encapsulates different service pseudowire labels.
  • the egress PE maps the virtual labels of different server groups. Go to different server group information.
  • the AC is the name of the VPN (Virtual Private Network) on the access network.
  • Step 202 The forwarding node performs a multi-protocol label switching (MPLS) process on the received packet, where the current node is the transit node of the penultimate hop (Transit), and the original label in the packet is exchanged as The virtual label of the server group of the packet service; when the current node is the egress PE, the label in the received packet is popped up;
  • MPLS multi-protocol label switching
  • the ingress node parses and identifies the packet. Because the packet parsing in the packet-by-packet forwarding system will reduce the efficiency of the packet, the parsing and identification function can be controlled by the switch. This function mainly performs four-layer identification and protocol type analysis on the type of the forwarded message. The countermeasures are executed based on the internal information of the message header, and different server groups are selected according to the content.
  • multiple customized service switches can be enabled at the same time, and the pseudowires of multiple services can be bound to implement the pseudo-layer layer splitting of different types of service packets.
  • the ordinary MPLS-TP tunnel is forwarded.
  • the forwarding node When processing an MPLS-TP packet from the side of the AC (the access circuit, the attached circuit is connected to the user edge device), the forwarding node (in this case, the ingress node) will resolve the MPLS-TP packet of the user, for example, IPV6.
  • the packet enters the pseudowire channel of IPV6, and can also parse the Layer 4-7 services of the OSI (Open System Interconnect) reference model, and enter different service pseudowires according to requests sent to different URLs.
  • Pipeline forwards the packet according to the assigned label channel.
  • Currently supported services are: HTTP, HTTPS, FTP, TELNET, IPV6 (NAT-PT).
  • Ordinary packets that do not belong to the above service types are still forwarded by ordinary MPLS-TP according to the original ordinary pseudowires. Specifically, in the middle node of the penultimate hop, the penultimate hop pop-up operation is not performed, but the server group virtual label is marked.
  • the outbound node presets the server group label information table, which stores the correspondence between the server group virtual label and the server group information (including the server's MAC address) (the server group virtual label can point to the server group information table by means of the internal index). Stored in the form of a HASH table or a binary tree to increase the reading speed. It is written in static mode and used in the global networking environment.
  • Step 203 The forwarding node forwards the processed packet, where the current node is an outgoing node, and the packet is forwarded according to the server group information corresponding to the virtual label of the server group.
  • the outbound node presets the server group label information table, which stores the correspondence between the server group virtual label and the server group information (including the server's MAC address) (the server group virtual label can point to the server group information table by means of the internal index). Stored in the form of a HASH table or a binary tree to increase the reading speed. It is written in static mode and used in the global networking environment.
  • the egress node After receiving the packet, the egress node extracts the service information in the packet and queries the server group label information table to obtain the server group information corresponding to the virtual label. According to the server load balancing policy (Round Robin, Weight Round Robin ( Weighted polling) or randomly selecting a policy, balancing the servers in the server group to obtain the MAC information of the server, and the egress node obtains the service information of the packet again or distributes the packet to the designated server to achieve the purpose of load balancing. After the server obtains the V6 address and the application service information, the server sends the processed information back to the PTN device on the AC side.
  • the server load balancing policy Red Robin, Weight Round Robin ( Weighted polling) or randomly selecting a policy
  • the last hop service device may be placed anywhere on the bearer network.
  • the forwarding node is the last hop service device of the content exchange, it also has a fast packet processing mechanism, that is, the information of the third layer and the above in the packet header is quickly replaced, including information replacement of the service packet, URL replacement, and Address proxy replacement, etc., such as NAT-PT conversion of IPV4 and IPV6 addresses, content exchange of information such as HTTP, HTTPS, FTP, EMAIL, etc.
  • the IPV4 address in the 4 ⁇ text is replaced by the fast 4 ⁇ text processing mechanism, and the IPV6 header address is encapsulated.
  • the effect is sent to www.aaa.com.
  • Requests can be sent to a specified set of servers, and requests sent to www.zzz.com are sent to a different set of servers instead of sending all HTTP traffic to a group of servers.
  • This provides a more explicit load balancing and allows virtual hosts to be implemented compared to a TCP/UDP (Transmission Control Protocol, User Data Protocol, User Datagram Protocol) port.
  • Network switching can also send specified Uniform Resource Locators (URLs), file types, Uniform Resource Identifiers (URIs), Cookies, etc.
  • URLs Uniform Resource Locators
  • URIs Uniform Resource Identifiers
  • the /products request can be sent to the product server, and the www.aaa.com/technical request can be sent to the designated server that handles the technical content.
  • Increased server throughput speeds up response time and improves user experience quality.
  • the content-processed message faces two choices on the outgoing node (such as the foreground server PTN (Packet Transport Network) device of the content server): 1. It will be summarized locally to the AC side. 2. The service pseudowire label is popped up and summarized and the MPLS-TP forwarding is continued.
  • PTN Packet Transport Network
  • the method of summarizing locally to the AC side The last hop pops up the virtual label and forwards it to the AC.
  • the method of forwarding to the PW side is as follows: The virtual label of the server group is popped up, and the actual forwarding label is added to continue the PW forwarding of the MPLS-TP.
  • the packet is forwarded to another PW.
  • the specific method is as follows: Bind the PW or related Pseudo-line to the VPN instance of the device.
  • the packets of the service Pseudo-wire of a VPN instance are all aggregated to the PW or related Pseudowire. .
  • the advantages are: load balancing is supported in the MPLS-TP protocol environment, fast packet encapsulation is performed by the pseudo layer layer, and the forwarding mode of the pseudo layer layer is not changed, and the PHP forwarded by MPLS-TP (PHP (Personal Hop Hopping)) It refers to the penultimate hop label eject function of MPLS.
  • PHP Personal Hop Hopping
  • MPLS-TP PHP is not supported by default.
  • the penultimate hop does not pop up to support the exchange and identification of the virtual label of the server group service. Therefore, MPLS The -TP technology has good supportability for the solution of the present invention.
  • the default off, fast forwarding of the label, support for multiple dynamic and static label allocation modes, etc. realizes the combination of the business process and the directional forwarding of the service text, and
  • the last hop implements the combination of label forwarding and the original load balancing technology.
  • the PW forwarding mode can be continued after the service pseudo-line label is popped up, so that the content exchange can be performed on the PW trunk without the need for SR or SR+ routers.
  • the end of the business has adapted to the trend of flattening network equipment in the future, and it also provides great flexibility for existing network deployment.
  • the foregoing describes the method for forwarding the application service packet using the MPLS technology from the perspective of a single forwarding node, and may also be described in the direction along the forwarding path. As shown in FIG. 3, the following steps are included:
  • the ingress PE receives the packet, inserts a label of the pseudowire corresponding to the packet, and forwards the packet.
  • the intermediate node receives the packet and forwards the packet, and the transit node of the penultimate hop exchanges the original label in the packet to the virtual label of the server group corresponding to the original label, where different server groups are different.
  • Server group virtual label
  • the egress PE receives the packet and ejects the label in the received packet.
  • the packet is forwarded according to the server group information corresponding to the virtual label of the server group.
  • FIG. 4 it is a specific implementation step of the present invention, which mainly implements a pseudo-line pair service bearer in a 1:1 manner, and uses LDP or a static label allocation manner to allocate a server group virtual label for a pseudo-line, from the same
  • the packets from the AC are based on the same pseudowire, and the service-based pseudo-line traffic separation is performed.
  • the service or content server group corresponding to the packet is selected to select the target server, and the MPLS-TP technology supports content exchange and load sharing. In this way, content exchange and load sharing technologies can be better implemented in the bearer network field, reducing response time, improving user friendliness and network operational capability:
  • Step 401 Create a service pseudo-line, and assign a label according to the tunnel label assignment type (static, LDP, RSVP), and the last hop is a virtual label of the server group service;
  • the tunnel label assignment type static, LDP, RSVP
  • the PW template can specify the service type carried by the pseudowire.
  • the label allocation mode static, LDP (Label Distribution Protocol)
  • the VCID range of the pseudowire used to carry the service will be controlled.
  • the PW label generated by this VC is the server group service virtual label.
  • Step 402 Enable a related custom service switch in the L2VPN service instance, and in the L2VPN Bind the service pseudowire under the service instance;
  • the packet parsing and identifying service is used as a customized service, and the related customized service switch is enabled in the L2VPN service instance, and the service pseudowire is bound to the L2VPN (L2VPN virtual private network L2 VPN) service instance and the outer tunnel. After the binding succeeds, the service takes effect.
  • the packets that belong to this instance are processed as packets that need to be parsed and forwarded. After the packet is parsed, the packet is sent to the MPLS-TP forwarding process. .
  • Step 403 The ingress node parses the service packet, and if it is identified as the corresponding service pseudowire, enters the MPLS-TP content exchange forwarding process, and performs the normal packet forwarding process if the service pseudowire is not correspondingly enabled;
  • the ingress node needs to determine whether the service corresponding to the packet is bound to the service pseudowire according to the service information in the received packet, and whether the service switch is enabled when the service pseudowire is bound; the service pseudowire or the binding service pseudowire is not bound. If the service switch is not enabled, the normal MPLS tunnel is processed and forwarded, that is, the normal pseudowire is forwarded in the L2VPN instance. If the service pseudowire is bound and the service switch is enabled, the service information is selected according to the service information. The service pseudowire determines the next hop label.
  • the packet enters the MPLS-TP content exchange forwarding process, including the ingress node insertion label and the intermediate node exchange label.
  • Step 404 The intermediate node of the penultimate hop does not pop up the label, and performs virtual label exchange.
  • Step 405 The last hop (ie, Egress PE) determines whether the label of the last hop is in the service virtual label space, if the last hop label If the information is not in the virtual label space, the server group label information table is not queried, and the normal packet forwarding process is performed.
  • Step 406 The egress PE queries the server group label information table, and if the label corresponding information is not found, the normal forwarding process is also performed. If the query obtains the server group information corresponding to the virtual label, step 407 is performed;
  • the egress PE When the egress PE receives different virtual labels of server groups, it maps different labels to different server groups.
  • Step 407 According to the server load balancing policy, the balanced scheduling acquires the MAC address information of the server, and sends the information related to the packet to the target server according to the MAC address.
  • Step 408 If the content exchanged message is terminated locally according to the content processed, the service will be popped up. After the pseudo-label is added to the AC, the PW-side forwarding of the MPLS-TP is continued.
  • the packet parsing and identifying service is used as a customized service, and the switch of the related customized service is enabled in the L2VPN service instance, and the service pseudowire is bound to the L2VPN service instance and the outer tunnel.
  • the service is valid.
  • the packets that belong to this instance are processed as packets that need to be parsed and forwarded. After the packet is parsed, the packet is sent to the MPLS-TP forwarding process. In the penultimate hop, the label does not pop up, but the last hop label is assigned, that is, the server group virtual label of the service is allocated from the service load balancing label space.
  • the present invention also provides a forwarding node that utilizes MPLS technology, and the forwarding node includes:
  • a message receiving module configured to receive a message
  • the packet forwarding module is configured to forward the processed packet, and when the forwarding node is an outgoing node, the packet forwarding is performed according to the server group information corresponding to the virtual label of the server group.
  • the forwarding node further includes a service pseudowire creation module, which is configured to allocate labels, create service pseudowires, and bind different service pseudowires to different service types.
  • the forwarding node further includes a text parsing and identifying module and a normal processing and forwarding module.
  • the packet parsing and identifying module is configured to: when the forwarding node is an ingress node, parse the received packet according to the received packet.
  • the service information in the message determines whether the service corresponding to the packet is bound to the service pseudowire, and whether the service switch is enabled when the service pseudowire is bound; and if the service corresponding to the packet is determined to be bound to the service pseudowire and the service switch is enabled When possible, the service pseudowire is selected according to the service information, and the next hop label is determined;
  • the normal processing forwarding module is configured to not bind the service pseudowire or the service corresponding to the packet When the service pseudowire is bound but the service switch is not enabled, the packet is processed and forwarded by the common MPLS tunnel.
  • the method further includes:
  • the information table caching module is configured to save a correspondence between the virtual label of the server group and the server group information, where the server group information includes a MAC address of the server;
  • An information table query module configured to query server group information according to a server group virtual tag in the packet
  • the load balancing module is configured to balance the server group information that is queried according to the load balancing policy, and obtain the MAC address of the server.
  • the present invention provides a method for implementing an application service packet forwarding by using the MPLS technology, and integrating the content application service into the PTN bearer network to implement the introduction of the service into the PTN bearer network, thereby constructing a PTN bearer network that can be operated and managed.
  • the invention can support the load sharing of the server group through the reasonable transformation of the pseudowire technology, and adopts the technology of combining label distribution and pseudowire technology, does not use the address replacement scheme such as VIP, improves the forwarding efficiency, and makes the content forwarding and load sharing process organic. Combine.
  • the invention implements the bearer of the pseudo-line pair service in a 1:1 manner, realizes the fast directional forwarding of the application service, and allocates the virtual label of the server group for the pseudo-line by using the LDP or the static label allocation manner, thereby realizing the pseudo-line quantity separation based on the service.
  • This patent uses load balancing technology to provide NAT-PT services.
  • On the Layer 2 switch it will communicate with the NAT-PT server group through a dedicated encryption channel, providing address translation services and customizable Layer 4 and above content exchange, custom HTTP.
  • the content exchange of application services such as HTTPS, EMAIL, and FTP, and the application layer forwarding capability is enhanced by using MPLS-TP technology.
  • the networking environment suitable for the present invention is a typical or atypical networking of a PTN that uses MPLS-TP technology.
  • the server group (server group) can be deployed after the RNC of the aggregation ring or after the aggregation node on the access ring. , you can also deploy a server group after access nodes of the access ring.
  • the present invention selects different server groups by performing load sharing countermeasures based on the internal information of the packet header.
  • the penultimate hop does not pop up, but is exchanged for the server group virtual label. On the last hop, the virtual label is popped up to query the corresponding server group information, and then according to the server group load sharing strategy: Round Robin, random selection, Weight Round Robin Select the target server.
  • the egress node directs the message or information to the server group dedicated connection port, performs load balancing countermeasures according to the internal information of the packet header, and optimizes the WEB service for special functions such as image service, SSL conversation, and database transaction service.
  • the present invention utilizes the existing MPLS technology for switching forwarding, which can improve the switching capability of the application layer service, especially in the directional forwarding, and can take advantage of the MPLS-TP technology label forwarding, through the MPLS-TP.
  • the pseudowire technology enables fast directional forwarding of application services.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention porte sur un procédé de retransmission de paquets de services d'application au moyen de la commutation par étiquette multi-protocole (MPLS ) et un nœud de retransmission de celui-ci, le procédé comprenant : la réception d'un paquet par un nœud de retransmission ; l'exécution par, le nœud de retransmission d'un traitement MPLS sur le paquet reçu où lorsque le nœud de retransmission est un nœud intermédiaire de l'antépénultième saut, l'étiquette originale dans le paquet est remplacée par une étiquette virtuelle de groupe de serveurs correspondant à l'étiquette originale et lorsque le nœud de retransmission est un nœud de sortie (PE de sortie), l'étiquette virtuelle de groupe de serveurs est rejetée du paquet, les différentes étiquettes virtuelles de groupe de serveurs correspondant à des informations différentes de groupe de serveurs ; et la retransmission par le nœud de retransmission du paquet traité, lorsque le nœud de retransmission est le nœud de sortie, la retransmission du paquet selon les informations de groupe de serveurs correspondant à l'étiquette virtuelle de groupe de serveurs. La présente invention permet de mettre en œuvre une retransmission directionnelle et rapide de contenus à échanger.
PCT/CN2011/078903 2011-02-09 2011-08-25 Procédé de retransmission de paquets de services d'application au moyen de mpls et nœud de retransmission de celui-ci Ceased WO2012106950A1 (fr)

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