WO2017143717A1 - Procédé et dispositif de traitement d'informations de multidiffusion - Google Patents

Procédé et dispositif de traitement d'informations de multidiffusion Download PDF

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Publication number
WO2017143717A1
WO2017143717A1 PCT/CN2016/088601 CN2016088601W WO2017143717A1 WO 2017143717 A1 WO2017143717 A1 WO 2017143717A1 CN 2016088601 W CN2016088601 W CN 2016088601W WO 2017143717 A1 WO2017143717 A1 WO 2017143717A1
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bsl
information
bier
network
bfr
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PCT/CN2016/088601
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English (en)
Chinese (zh)
Inventor
王翠
张征
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中兴通讯股份有限公司
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Publication of WO2017143717A1 publication Critical patent/WO2017143717A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/16—Multipoint routing

Definitions

  • This document relates to but not limited to the field of multicast technology, and in particular relates to a multicast information processing method and apparatus.
  • the BIER (Bit Index Explicit Replication) technology is a multicast technology that has been studied in the IETF (The Internet Engineering Task Force) in the past two years.
  • the basic principle of the BIER is to assign a unique BFR-id (Bit-Forwarding Router Identifier) to the nodes in each BIER domain (for example, the BIER Forwarding Router (BFR)).
  • BFR-id Bit-Forwarding Router Identifier
  • BitSting corresponding to BFR-1 with BFR-id of 1 is 00001
  • BitSting corresponding to BFR-2 with BFR-id of 2 is 00010, and so on.
  • BFR-1 When a multicast packet arrives at BFR-1, BFR-1 is used as a BFIR (Bit-Forwarding Ingress Router) to determine which sub-domain sub-domain belongs to, and then decides in some way. Which BFERs (Bit-Forwarding Egress Routers) need this multicast traffic. For example, if BFR-2 and BFR-3 are required to obtain multicast traffic, then these BFR-2s that require this multicast traffic will be used.
  • the BFR-id corresponding to the BFR-3 is parsed into a Set Identifier (SI), and the bit positions (BitPosition) corresponding to the BFR-2 and the BFR-3 are combined into a bit string BitString, that is, 00110.
  • SI Set Identifier
  • BitString BitString
  • BFR-1 to BFR-80 belong to the same sub-domain.
  • the BRL of the BFR-1 configuration is 128, the BSL of the BFR-10 configuration is 128, the BRL of the BFR-20 configuration is 128, the BSL of the BFR-70 configuration is 64, and the BSL of the BFR-80 configuration is 64.
  • Step 101 The ingress node BFR-1 parses the BFR-id information of the BFR-10/BFR-20/BFR-70/BFR-80 according to the BSL 128 supported by itself, and obtains a 128-bit set of BitString, where BFR-10 The BitString corresponds to the 10th bit of the 128 bits, the BitString of the BFR-20 corresponds to the 20th bit of the 128 bits, and the BitString of the BFR-70 corresponds to the 70th of the 128 bits, BFR- The BitString of 80 corresponds to the 80th bit of the 128 bits, so the set of BitStrings of the destination BFRs corresponds to the 10th bit / the 20th bit / the 70th bit / the 80th bit of the 128 bits, and then according to the 128 bit BitString
  • the set, and the sub-domain information, the Set (set) identification information and the BSL-related information to find the BIFT table, find that the next hop of the message is BFR-30
  • Step 102 The intermediate node BFR-30 receives the BIER message, and forwards and copies the message to each destination node BFR10/BFR20/BFR70/BFR80 according to the BIFT table;
  • Step 103 The exit nodes BFR-10 and BFR-20 receive the BIER message. Since BFR-10 and BFR-20 support BSL 128, the sub-domain information in the BIER header can be correctly parsed, and the set identification information is related to the BSL. The information, and the 128-bit BitString information, find that the node is the destination node, and then decapsulate the BIER header, and further forward the multicast packet according to the multicast layer information;
  • Step 104 The exit nodes BFR-70 and BFR-80 receive the BIER message. Because BFR-70 and BFR-80 support BSL 64, the BSL information and the BitString information in the BIER header may not be correctly parsed, which may result in forwarding black holes.
  • the present invention provides a multicast information processing method and apparatus, which enables a bit-bit forwarding device in a network to use a consistent bit string length in a forwarding process, thereby avoiding a forwarding error.
  • the embodiment of the invention provides a multicast information processing method, which is applied to a decision device, and the method includes:
  • the BIER information includes bit length BSL information supported by each BIER forwarding device in the network.
  • the decision device includes: a centralized control device or a non-centralized control device;
  • the centralized control device includes: a designated BIER forwarding device, or a controller;
  • the decentralized control device includes: a non-designated BIER forwarding device.
  • the method further includes:
  • the bit index in the acquiring network displays the copied BIER information, including:
  • determining, according to the BIER information, a bit string length uniformly used in the network BSL including:
  • each BIER forwarding device in the network has an intersection, selecting the longest BSL in the intersection as the BSL uniformly used in the network;
  • the shortest BSL in the BSL supported by the BIER forwarding device is selected as the BSL uniformly used in the network.
  • the BIER information further includes information related to the BSL decision: priority information of the BSL.
  • determining, according to the BIER information, a bit string length BSL uniformly used in the network including:
  • the BSL set supported by each BIER forwarding device in the network has an intersection and the BIER information includes the priority information of the BSL, the BSL with the highest priority in the intersection is selected as the BSL uniformly used in the network.
  • the embodiment of the invention provides a multicast information processing device, which is applied to a decision device, and includes:
  • An information obtaining module configured to obtain a bit index in the network to display the copied BIER information
  • a decision module configured to determine a bit string length BSL uniformly used in the network according to the BIER information
  • the BIER information includes bit length BSL information supported by each BIER forwarding device in the network.
  • the decision device includes: a centralized control device or a non-centralized control device;
  • the centralized control device includes: a designated BIER forwarding device, or a controller;
  • the decentralized control device includes: a non-designated BIER forwarding device.
  • the determining module is further configured to: when the determining device is a centralized control device, after determining the bit length BSL uniformly used in the network according to the BIER information, further forwarding to each BIER in the network.
  • the device sends a notification message, where the notification message carries the determined BSL information uniformly used in the network.
  • the information obtaining module is configured to obtain the bit BIER information in the network by using the following manner:
  • the decision module is configured to determine, according to the BIER information, the bit string length BSL uniformly used in the network in the following manner:
  • each BIER forwarding device in the network has an intersection, selecting the longest BSL in the intersection as the BSL uniformly used in the network;
  • the shortest BSL in the BSL supported by the BIER forwarding device is selected as the BSL uniformly used in the network.
  • the BIER information further includes information related to the BSL decision: priority information of the BSL.
  • the decision module is configured to determine, according to the BIER information, the bit string length BSL uniformly used in the network in the following manner:
  • the BSL set supported by each BIER forwarding device in the network has an intersection and the BIER information includes the priority information of the BSL, the BSL with the highest priority in the intersection is selected as the BSL uniformly used in the network.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, which are implemented when executed by a processor.
  • the decision device displays the copied BIER information by acquiring the bit index in the network, and determines the uniformly used bits in the network according to the BIER information.
  • the string length BSL enables the bit-bit forwarding device in the network to use a consistent bit string length in the forwarding process, thereby avoiding forwarding errors.
  • FIG. 1 is a schematic diagram of a bit BFD display replication BIER technology architecture in the related art
  • FIG. 2 is a schematic diagram of multicast traffic forwarding in the related art
  • FIG. 3 is a flowchart of a method for processing multicast information according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a multicast information processing apparatus according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of determining a BSL by a designated BIER forwarding device according to an example 1 of the present invention.
  • FIG. 6 is a schematic diagram of determining a BSL by a designated BIER forwarding device in Example 2 of the present invention.
  • FIG. 7 is a schematic diagram of a controller determining a BSL according to Example 3 of the present invention.
  • Example 8 is a schematic diagram of determining a BSL by a non-designated BIER forwarding device in Example 4 of the present invention.
  • Figure 9 is a schematic diagram showing changes in BSL in Example 5 of the present invention.
  • Example 10 is a schematic diagram of determining a BSL rule in Example 6 of the present invention.
  • Example 11 is a schematic diagram of determining a BSL rule in Example 7 of the present invention.
  • Example 12 is a schematic diagram of determining a BSL rule in Example 8 of the present invention.
  • FIG. 13 is a schematic diagram of multicast traffic forwarding after determining a BSL in Example 9 of the present invention.
  • an embodiment of the present invention provides a multicast information processing method, which is applied to a decision device, and the method includes:
  • the BIER information includes: bit length BSL information supported by each BIER forwarding device in the network;
  • the BIER information may further include: information related to the BSL decision;
  • the information related to the BSL decision includes: priority information of the BSL;
  • the decision device includes: a centralized control device or a non-centralized control device;
  • the centralized control device includes: a designated BIER forwarding device, or a controller;
  • the decentralized control device includes: a non-designated BIER forwarding device.
  • the network includes: a multicast network
  • the method further includes:
  • the bit string length BSL uniformly used in the network may be directly determined according to the BIER information
  • the designated BIER forwarding device may be an entity BIER forwarding device or a virtual forwarding device.
  • the bit index in the acquiring network displays the copied BIER information, including:
  • determining, according to the BIER information, a bit string length BSL uniformly used in the network including:
  • each BIER forwarding device in the network has an intersection, selecting the longest BSL in the intersection as the BSL uniformly used in the network;
  • the shortest BSL in the BSL supported by the BIER forwarding device is selected as the BSL uniformly used in the network.
  • determining, according to the BIER information, a bit string length BSL uniformly used in the network including:
  • the BSL set supported by each BIER forwarding device in the network has an intersection and the BIER information includes the priority information of the BSL, the BSL with the highest priority in the intersection is selected as the The BSL used uniformly in the network.
  • an embodiment of the present invention provides a multicast information processing apparatus, which is applied to a decision device, and includes:
  • the information obtaining module 401 is configured to obtain a bit B index information in the network to display the copy BIER information;
  • the decision module 402 is configured to determine, according to the BIER information, a bit string length BSL uniformly used in the network;
  • the BIER information includes: bit length BSL information supported by each BIER forwarding device in the network;
  • the BIER information may further include: information related to the BSL decision;
  • the information related to the BSL decision includes: priority information of the BSL;
  • the decision device includes: a centralized control device or a non-centralized control device;
  • the centralized control device includes: a designated BIER forwarding device, or a controller;
  • the decentralized control device includes: a non-designated BIER forwarding device.
  • the network includes: a multicast network
  • the determining module 402 is further configured to: when the determining device is a centralized control device, after determining the bit length BSL uniformly used in the network according to the BIER information, and further to each BIER in the network.
  • the forwarding device sends a notification message, where the notification message carries the determined BSL information uniformly used in the network.
  • the information obtaining module 401 is configured to: obtain the BIER information by using the bit index in the network to receive the BIER information sent by the controller; or receive the BIER information advertised by each BIER forwarding device.
  • the determining module 402 is configured to determine, according to the BIER information, the bit string length BSL uniformly used in the network in the following manner:
  • each BIER forwarding device in the network has an intersection, selecting the longest BSL in the intersection as the BSL uniformly used in the network;
  • the shortest BSL in the BSL supported by the BIER forwarding device is selected as the BSL uniformly used in the network.
  • the determining module 402 is configured to determine, according to the BIER information, the bit string length BSL uniformly used in the network in the following manner:
  • the BSL set supported by each BIER forwarding device in the network has an intersection and the BIER information includes the priority information of the BSL, the BSL with the highest priority in the intersection is selected as the BSL uniformly used in the network.
  • the specified BIER forwarding router is used as the decision device to determine the BSL.
  • the specific steps are as follows:
  • Step 101 Designating a BIER forwarding router D-BFR to receive BIER information of other BFRs sent by the underlay routing protocol;
  • the BIER information includes sub-domain information and one or more supported BSL information, and may also include information related to the BSL decision;
  • Step 102 Specifying the BIER forwarding router D-BFR first determines which sub-domain it belongs to, and then determining the bit length BSL to be uniformly used in the multicast network according to the received BSL information belonging to the sub-domain;
  • Step 103 Specify the BIER forwarding router D-BFR to send the determined BSL information to other BFRs belonging to the sub-domain by using a message;
  • the specified BIER forwarding router is used as the decision device to determine the BSL.
  • the specific steps are as follows:
  • Step 101 Specify that the BIER forwarding router D-BFR receives the BIER information sent from the centralized controller.
  • the BIER information includes sub-domain information and one or more supported BSL information, and may also include information related to the BSL decision;
  • Step 102 Specify the BIER forwarding router D-BFR from the received BIER information, determine the bit string length BSL that needs to be uniformly used in the multicast network, and send the message to other BFRs belonging to the sub-domain by using a message;
  • the BSL is determined by the controller as a decision device.
  • the specific steps are as follows:
  • Step 301 The controller acquires BIER information.
  • the BIER information includes sub-domain information and one or more supported BSL information, and may also include information related to the BSL decision;
  • Step 302 The controller determines the sub-domain information, and then determines the bit length BSL that needs to be uniformly used in the multicast network according to the obtained BSL information that belongs to the sub-domain.
  • Step 303 The controller sends the determined BSL information to the BFR belonging to the sub-domain by using a message
  • the controller may obtain the BIER information through the southbound protocol (including the BGP-LS protocol), or send the BIER information (including the BSL information) through the southbound protocol (including BGP-LS or NETCONF or OF-CONFIG);
  • the BSL is determined by the non-designated BIER forwarding router as the decision device.
  • the specific steps are as follows:
  • Step 401 Each BFR receives BIER information of other BFRs sent by the underlay routing protocol.
  • the BIER information includes sub-domain information and one or more supported BSL information. It may also include information related to BSL decisions;
  • Step 402 Each BFR determines which sub-domain it belongs to, and then determines the BSL information to be used according to a certain rule according to the received BSL information that belongs to the sub-domain;
  • the BSL information to be used on each BFR in the domain can be quickly updated by the following steps:
  • Step 501 Specify the BIER forwarding router D-BFR or the controller as the decision device to obtain the BIER information that needs to be updated;
  • the BIER information includes sub-domain information and updated BSL Y information
  • Step 502 Specify the BIER Y information that the BIER forwarding router D-BFR or the controller sends to the BFR belonging to the sub-domain by using a message;
  • the designated BIER forwarding router D-BFR can send a message through an extension of the underlay routing protocol; the controller can send a message through an extension of the southbound protocol (including BGP-LS or NETCONF or OF-CONFIG);
  • the decision device After obtaining the BIER information, the decision device determines the sub-domain information included in the BIER information, and the supported one or more BSL information; and performs the obtained BSL information set belonging to the same sub-domain or the same Set. BSL is ok.
  • BFR-1/BFR-2/BFR-3/BFR-4 belong to the same sub-domain or the same Set.
  • BFR-1 is used as a decision device.
  • the BRL supported by BFR-1 includes 64, 128, 256
  • the BRL supported by BFR-2 includes 128, 256
  • the BRL supported by BFR-3 includes 128, 256, 512
  • the BRL supported by BFR-4 includes 128, 256, 1024.
  • the decision equipment determines the BSL, the specific steps are as follows:
  • Step 601 BFR-2/BFR-3/BFR-4 advertises sub-domain information and supported BSL information of each of them;
  • Step 602 BFR-1 performs BSL selection from the collected BSL information set, and finds The BRL information supported by BFR-1/BFR-2/BFR-3/BFR-4 has an intersection, that is, both support BSL 128 and 256; therefore, the largest BSL 256 in the intersection is determined as the BSL information to be used;
  • Step 603 BFR-1 carries BSL 256 information, and sends an allocation message to BFR-2/BFR-3/BFR-4;
  • Step 604 BFR-1/BFR-2/BFR-3/BFR-4 uses the determined BSL 256 as the BSL information to be used for BIER forwarding.
  • the decision device After obtaining the BIER information, the decision device determines the sub-domain information included in the BIER information, and the supported one or more BSL information; and performs the obtained BSL information set belonging to the same sub-domain or the same Set. BSL is ok.
  • BFR-1/BFR-2/BFR-3/BFR-4 belong to the same sub-domain or the same Set.
  • BFR-1 is used as a decision device.
  • the BRL supported by BFR-1 includes 256
  • the BRL supported by BFR-2 includes 128, 256
  • the BRL supported by BFR-3 includes 512
  • the BSL supported by BFR-4 includes 256, 1024.
  • the decision equipment determines the BSL, the specific steps are as follows:
  • Step 701 BFR-2/BFR-3/BFR-4 advertises sub-domain information and supported BSL information of each of them;
  • Step 702 BFR-1 performs BSL selection from the collected BSL information set, and finds that there is no intersection of BSL information supported by BFR-1/BFR-2/BFR-3/BFR-4, so it is determined that the smallest BSL 128 is needed. BSL information used;
  • Step 703 BFR-1 carries BSL 128 information, and sends an allocation message to BFR-2/BFR-3/BFR-4;
  • Step 704 BFR-1/BFR-2/BFR-3/BFR-4 uses the determined BSL 128 as the BSL information to be used for BIER forwarding.
  • the decision device can also flexibly change the BSL determination rule to determine the BSL using a BSL determination rule that is more efficient and more conducive to BIER forwarding.
  • the decision device After obtaining the BIER information, the decision device determines the sub-domain information included in the BIER information, and the supported one or more BSL information, and the information related to the BSL decision (BSL priority information); the acquired sub belongs to the same sub BSL determination is performed in the BSL information set of -domain or the same Set.
  • BFR-1/BFR-2/BFR-3/BFR-4 belong to the same sub-domain or the same Set.
  • BFR-1 is used as a decision device.
  • the BRL supported by BFR-1 includes 64, 128 [2], 256 [1]
  • the BRL supported by BFR-2 includes 128, 256
  • the BSL supported by BFR-3 includes 128, 256, 512
  • the BRL supported by BFR-4 includes 128, 256, 1024.
  • 128[2] represents a 128-bit BSL with a priority of 2
  • 256[1] represents a 256-bit BSL with a priority of 1; the higher the priority value, the higher the priority, and the BFR-supported BSL priority.
  • the default value is 0.
  • the decision equipment determines the BSL, the specific steps are as follows:
  • Step 801 BFR-2/BFR-3/BFR-4 advertises sub-domain information and supported BSL information, and information related to BSL decision (priority information of BSL);
  • Step 802 BFR-1 performs BSL selection from the collected BSL information set, and finds that BSL information supported by BFR-1/BFR-2/BFR-3/BFR-4 has an intersection, that is, both support BSL 128 and 256;
  • the BSL 128 is found to have a priority of 2, which is higher than the priority 1 of the BSL 256. Therefore, the highest priority 128 in the intersection is determined as the BSL information to be used;
  • Step 803 BFR-1 carries BSL 128 information, and sends an allocation message to BFR-2/BFR-3/BFR-4;
  • Step 804 BFR-1/BFR-2/BFR-3/BFR-4 uses the determined BSL 128 as the BSL information to be used for BIER forwarding.
  • BFR-1 to BFR-80 belong to the same sub-domain.
  • the BRL of the BFR-1 configuration is 128, the BSL of the BFR-10 configuration is 128, the BRL of the BFR-20 configuration is 128, the BSL of the BFR-70 configuration is 64, and the BSL of the BFR-80 configuration is 64.
  • Ingress node BFR-1 when multicast traffic reaches BFR-1, it is found BFR-10/BFR-20/BFR-70/BFR-80 need to receive this multicast traffic.
  • the BIER header is parsed and encapsulated according to the BSL 128, and the BIER message is forwarded according to the BSL 128, resulting in forwarding of the black hole.
  • FIG. 13 it is a schematic diagram of multicast traffic forwarding after determining a BSL according to an embodiment of the present invention.
  • the decision device determines that the BSL to be used in the domain is 64, and each BFRs knows that the BSL to be used in the domain is 64. Then, multicast traffic is forwarded.
  • the specific steps are as follows:
  • Step 901 The multicast traffic reaches the ingress device BFR-1, and it is found that the BFR-10/BFR-20/BFR-70/BFR-80 needs to receive the multicast traffic, so the ingress node BFR-1 is determined according to the determined BSL 64. To parse the BFR-id information of BFR-10/BFR-20/BFR-70/BFR-80, and obtain a set of 64-bit BitString, where the set of BFR-10 is 0, and the BitString corresponds to the 64-bit.
  • BitString 10bit is set, BFR-20's Set is 0, BitString is corresponding to the 20th bit of 64 bits, BFR-70's Set is 1, BitString is corresponding to the 6th bit of 64 bits, BFR-80 Set is 1, BitString corresponds to the 16th bit of 64 bits, so the destination BFRs corresponds to 2 Sets, the BitString set in the first Set is the 10th and 20th bits of the 64 bits, and the second The BitString collection in the Set is set to the 6th bit and the 16th bit.
  • the ingress node BFR-1 finds that the destination node needs to be divided into two sets, so two packets are copied, and Set 0 carries its corresponding set of BitString (the 10th bit and the 20th bit of the 64 bits are set), and the sub-domain information.
  • the Set identifier information and the BSL-related information are searched for the BIFT table, and the next hop of the packet is BFR-30, and then the updated 64-bit BitString set is encapsulated, and the sub-domain information, the Set identifier information, and the BSL-related information are encapsulated.
  • the information is sent to the BIER header, and then the multicast message carrying the BIER header is forwarded to BFR-30;
  • Set 1 carries its corresponding set of BitString (the 6th bit and the 16th bit of the 64 bits are set), and sub- The domain information, the Set identification information, and the BSL-related information are searched for the BIFT table, and the next hop of the packet is also BFR-30, and then the updated 64-bit BitString set, and the sub-domain information, the Set identification information, and The BSL related information is sent to the BIER header, and then the multicast message carrying the BIER header is forwarded to the BFR-30;
  • Step 902 The intermediate node BFR-30 receives the BIER message, forwards and copies the BIER message whose Set is 0 according to the BIFT table to each destination node BFR10/BFR20, and forwards and copies the Set. Is a BIER message of 1 to each destination node BFR70 and BFR80;
  • Step 903 The exit nodes BFR-10 and BFR20 receive the BIER message. Since BFR-10 and BFR-20 support BSL 64, the sub-domain information, the Set identification information and the BSL related information in the BIER header can be correctly parsed. And the 64-bit BitString information, and find that the node is the destination node, so the BIER header is decapsulated, and the multicast packet is further forwarded according to the multicast layer information;
  • Step 904 The exit nodes BFR-70 and BFR-80 receive the BIER message. Because BFR-70 and BFR-80 support BSL 64, the sub-domain information in the BIER header can also be correctly parsed.
  • the Set identification information is related to the BSL. The information, as well as the 64-bit BitString information, finds that the node is the destination node, and then decapsulates the BIER header and further forwards the multicast packet according to the multicast layer information.
  • an embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions, which are implemented when executed by a processor.
  • the decision device displays the copied BIER information by acquiring the bit index in the network, and determining the bit length BSL uniformly used in the network according to the BIER information, so that the network can be made
  • the bit-forwarding device in use uses a consistent bit string length during the forwarding process to avoid forwarding errors.
  • each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. Instructions to achieve their corresponding functions. This application is not limited to any specific combination of hardware and software.
  • the decision device displays the copied BIER information by acquiring the bit index in the network, and determines the bit length BSL uniformly used in the network according to the BIER information, so that the bit forwarding device in the network can be enabled. Use a consistent bit string length during the forwarding process to avoid forwarding errors.

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Abstract

L'invention concerne un procédé de traitement d'informations de multidiffusion appliqué à un dispositif de prise de décision. Le procédé consiste : à obtenir des informations de réplication explicite d'indice de bit (BIER) dans un réseau ; et à déterminer une longueur de chaîne de bits (BSL) utilisée de manière uniforme dans le réseau conformément aux informations BIER.
PCT/CN2016/088601 2016-02-23 2016-07-05 Procédé et dispositif de traitement d'informations de multidiffusion WO2017143717A1 (fr)

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CN109756425B (zh) * 2017-11-07 2022-01-18 中国电信股份有限公司 组播转发方法、装置以及bfr
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