WO2016198016A2 - 一种bier控制信息的传输方法、装置和系统 - Google Patents

一种bier控制信息的传输方法、装置和系统 Download PDF

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WO2016198016A2
WO2016198016A2 PCT/CN2016/086905 CN2016086905W WO2016198016A2 WO 2016198016 A2 WO2016198016 A2 WO 2016198016A2 CN 2016086905 W CN2016086905 W CN 2016086905W WO 2016198016 A2 WO2016198016 A2 WO 2016198016A2
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bier
control information
information
packet
data packet
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PCT/CN2016/086905
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English (en)
French (fr)
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WO2016198016A3 (zh
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廖婷
胡方伟
张征
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中兴通讯股份有限公司
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Publication of WO2016198016A2 publication Critical patent/WO2016198016A2/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast

Definitions

  • Embodiments of the present invention relate to, but are not limited to, network communication technologies, and in particular, to a BIER (Bit Indexed Explicit Replication) technology in the field of multicast, a method, an apparatus, and a system for transmitting control information.
  • BIER Bit Indexed Explicit Replication
  • IP multicast technology enables efficient data transmission from point to point in IP networks. It can effectively save network bandwidth and reduce network load, so it has a wide range of applications in real-time data transmission, multimedia conferencing, data copying, IPTV (interactive network TV), games and simulation.
  • Multicast technology generally uses PIM (Protocol Independent Multicast) protocol (including Protocol Independent Multicast-Sparse Mode (PIM-SM) and Protocol Independent Multicast-Dense Mode (PIM-DM)), MSDP (Multicast Source).
  • PIM Protocol Independent Multicast
  • PIM-SM Protocol Independent Multicast-Sparse Mode
  • PIM-DM Protocol Independent Multicast-Dense Mode
  • MSDP Multicast Source
  • Implementation of the Discovery Protocol Multicast Source Discovery Protocol
  • a common feature of these multicast protocols is the need to construct a control plane multicast tree. The multicast tree is used to logically arrange the network planes into a tree to implement groups.
  • BIER Bit Indexed Explicit Replication
  • BFR Bit-Forwarding Router
  • BFER Bit-Forwarding egress
  • the multicast data is encapsulated into the BIER domain by BFIR, and is forwarded in the BIER domain depending on the header of the BIER, and via one or Multiple BFER devices leave the BIER domain.
  • the device that receives and forwards the BIER message is called the transit BFR of the BIER message.
  • a BFR can be either a BFIR role or a BFER role, depending on the encapsulation and decapsulation messages.
  • each BFR (the intermediate forwarding node may or may not be assigned) is assigned a globally unique bit position (bit position) in the entire BIER sub-domain.
  • Each BFER will have its own bit.
  • the position is flooded in the BIER domain using the IGP (Interior Gateway Protocol) protocol. All bit positions form a bitstring.
  • the transmission and routing of data packets in the BIER domain depends on the bitstring.
  • other BFRs receive the header containing the BIER, they are forwarded based on the Bit Forwarding Table (bit forwarding table or bit index forwarding table) according to the bit string carried in the BIER header. This principle of forwarding based on the BIER bit will change the forwarding based on the construction of the multicast distribution tree to the unicast lookup and forwarding using the bit identifier, which greatly reduces the forwarding cost of the network.
  • FIG. 2 depicts the BIER forwarding process.
  • BFR1 is ingress BFR or BFIR
  • BFR5, BFR6, and BFR7 are both egress BFR or BFER.
  • the bit positions of the three BFRs are 0001, 0010, and 0100, respectively.
  • Egress BFR advertises its own in the BIER domain through the IGP protocol (such as the IS-IS (Intermediate System to Intermediate System) protocol or the OSPF (Open Shortest Path First) protocol).
  • IGP protocol such as the IS-IS (Intermediate System to Intermediate System) protocol or the OSPF (Open Shortest Path First) protocol.
  • Bit position BFR1 receives the BFR5, BFR6 and BFR7 bit position notifications, and saves this information in the local bit index forwarding table.
  • BFR1 When BFR1 receives a multicast packet and assumes that the multicast packet needs to be transmitted to BFR5 and BFR6, BFR1 calculates the value of the Bitstring of the packet as 0101 based on the mapping relationship saved in advance.
  • the packet is encapsulated as a BIER packet.
  • the Bitstring in the BIER Header is padded with 0101 and forwarded to BFR2.
  • BFR2 After receiving the packet, BFR2 searches for the entry in the previously stored bit index forwarding table. According to the entry, the packet needs to be forwarded to BFR3, and then the packet needs to be forwarded to BFR3.
  • the Bitstring is paired with the F-BM (Forwarding Bit Mask) of the matching entry to obtain 0101.
  • F-BM Forwarding Bit Mask
  • BFR2 refills the BIER message with 0101 as the Bitstring in the BIER Header, and forwards the message.
  • BFR3 finds its own bit index forwarding table after receiving the message.
  • BFR3 has 2 matching records, which respectively represent the next hop of the packet to BFR4 and BFR6.
  • BFR3 will be Bitstring.
  • the value of the operation is compared with the F-BM in the entry, and the result is 0001.
  • the value of the Bitstring and the result of the F-BM operation are 0100.
  • BFR3 forwards the BIER message from the two interfaces to BFR4 and BFR6 respectively, wherein the BIER header of BFR4 has a value of 0001, and the value of the Bitstring of the BIER Header forwarded to BFR6 is 0100.
  • the value of the bitstring is the same as the bit position that it advertises. It indicates that it is the destination of the packet and decapsulates the BIER packet.
  • the packet forwarding is forwarded to the BFR5, and the BIER packet is decapsulated by the BFR5.
  • the multicast packet is transmitted in the BIER domain, and the multicast packet is The BFR1 node of the ingress is forwarded to the receiving nodes BFR4 and BFR6 of the multicast.
  • the BIER control message is advertised by the extended IGP or BGP (Border Gateway Protocol).
  • IGP Extended IGP
  • BGP Border Gateway Protocol
  • the IGP protocol floods the message to all nodes of the BFR in the entire BIER domain.
  • the corresponding channel is established between the border nodes.
  • IGP protocol or BIER it needs to be extended accordingly.
  • the embodiment of the invention provides a method, a device and a system for transmitting BIER control information, which can easily and efficiently transmit control information and avoid flooding of control information.
  • the bit forwarding ingress router BFIR constructs a BIER data packet, and the packet header carries indication information for indicating that the BIER data packet carries control information, and the control information is carried in the packet body.
  • the method further includes: the BFIR carrying a bit string bitstring of a bit forwarding egress router BFER that needs to receive the BIER data packet in a packet header; and, after constructing the BIER data packet, the method The BFIR sends the BIER data packet to a lower node in the BIER domain.
  • the method further includes: directly receiving the BFER of the BIER data packet according to the indication information carried in the packet header for indicating the carrying control information of the BIER data packet, and directly decapsulating The control information in the loaded message body is sent to the control plane.
  • control information includes one of the following: the multicast group information that the BFIR joins, the revoked multicast group information, and the information that is added to the multicast virtual private network VPN.
  • the indication information is identified by a protocol proto field value in a BIER header.
  • the embodiment of the present invention further provides a bit forwarding ingress router BFIR, configured to send a bit index based explicit copy BIER control information, where the BFIR includes a first constructing module and a second constructing module, where:
  • the first constructing module is configured to: when the BIER data packet is configured, carry the indication information used to indicate the carrying control information of the BIER data packet in the packet header;
  • the second constructing module is configured to carry the control information in the packet body when constructing the BIER data packet.
  • control information includes one of the following: the multicast group information that the BFIR joins, the revoked multicast group information, and the information that is added to the multicast virtual private network VPN.
  • the first constructing module carries, in the packet header, the indication information for indicating that the BIER data packet carries the control information, where the first constructing module is in the protocol proto field of the packet header. And carrying the indication information for indicating that the BIER data packet carries control information.
  • the embodiment of the present invention further provides a bit forwarding egress router BFER, configured to receive an explicit index BIER control information based on a bit index, where the BFER includes a receiving module and a decapsulation module, where:
  • the receiving module is configured to receive a BIER data packet, and determine whether the packet header carries indication information for indicating that the BIER data packet carries control information.
  • the decapsulation module is configured to directly decapsulate the control information sent in the packet body when the receiving module determines that the packet header carries the indication information for indicating the BIER data packet carrying control information. surface.
  • control information includes one of the following: the multicast group information that the BFIR joins, the revoked multicast group information, and the information that is added to the multicast virtual private network VPN.
  • the embodiment of the invention further provides a transmission system of BIER control information, comprising the above-mentioned bit forwarding ingress router BFIR and a bit forwarding egress router BFER.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions for implementing the above method.
  • the multicast-related access information is only perceived by the border node, and is transparently transmitted to the intermediate forwarding node, which saves the time and mechanism for processing the memory occupation of the intermediate forwarding node, and at the same time, due to the control information. Sharing only between boundary nodes avoids information leakage on unrelated nodes.
  • FIG. 1 is a network diagram of a BIER technology in the related art
  • FIG. 2 is a diagram of a BIER technology forwarding process in the related art
  • FIG. 3 is a schematic diagram of a BIER header in the related art
  • Figure 4 is a flow chart of the embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a BFIR according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic structural diagram of a BFER according to Embodiment 2 of the present invention.
  • Figure 7 is a schematic diagram of a control plane message format.
  • the release of the BIER control message in the related art is performed by using extended IGP or BGP.
  • the IGP protocol floods the message to all nodes of the BFR of the entire BIER domain.
  • control messages such as which multicast group addresses are connected to the boundary, or Which VPN (Virtual Private Network)-related information is added to the boundary, and the information that only needs to be exchanged between the border nodes is unnecessary for the intermediate forwarding node, and the flooding in the related art
  • VPN Virtual Private Network
  • This embodiment provides a method for transmitting BIER control information, as shown in FIG. 4, including the following steps:
  • Step 401 When constructing a BIER data packet, the BFIR carries indication information for indicating that the BIER data packet carries control information in the packet header.
  • Step 402 When constructing a BIER data packet, the BFIR carries the control information in the packet body.
  • the BFIR when constructing a BIER data packet, the BFIR further carries a bit string of the BFER that needs to receive the BIER data packet in the packet header, and constructs a BIER data packet after the step 402. After completion, the BFIR sends the BIER data packet to a lower node in the BIER domain.
  • the BFER that receives the BIER data packet directly decapsulates the control information sent to the control plane of the packet body according to the indication information carried in the packet header for indicating the carrying control information of the BIER data packet.
  • the control plane refers to a plane for controlling and managing data packets.
  • the foregoing control information includes, but is not limited to, one of the following: the multicast group information that the BFIR joins, the revoked multicast group information, and the information that is added to the multicast virtual private network VPN.
  • the indication information is carried in a protocol proto (protocol) field.
  • Figure 3 shows the packet header encapsulation of the BIER data packet (the packet encapsulated by the packet header is abbreviated as BIER packet).
  • the packet type (4 bit length proto) carried in the current BIER encapsulation has a total of 6 types. , including two types of MPLS packets, IPv4 (Internet Protocol version 4) messages, IPv6 (Internet Protocol version 6) messages, BIER OAM (Operation Administration and Maintenance, operations, Manage and maintain) messages and Ethernet messages.
  • IPv4 Internet Protocol version 4
  • IPv6 Internet Protocol version 6
  • BIER OAM Operaation Administration and Maintenance, operations, Manage and maintain
  • the BIER packet carries a control plane packet, and the control plane packet carries control information that needs to be advertised to the peer end, such as multicast group information that the border nodes need to interact with each other, or multicast vpn-related information. Wait.
  • the multicast-related access information is only perceived by the border node, and is transparently transmitted to the intermediate forwarding node, which saves the time and mechanism for processing the memory occupation of the intermediate forwarding node, and at the same time, because the control information is only at the boundary node. Sharing between, avoiding information leakage on unrelated nodes.
  • the BFIR includes a first configuration module 501 and a second configuration module 502, where:
  • the first constructing module 501 is configured to: when the BIER data packet is configured, carry the indication information for indicating the carrying control information of the BIER data packet in the packet header;
  • the second constructing module 502 is configured to carry the control information in the packet body when constructing the BIER data packet.
  • the first constructing module 501 in the packet header, carries indication information for indicating that the BIER data packet carries control information, including:
  • the first constructing module 501 carries the indication information for indicating the current BIER data packet carrying control information in the protocol proto field of the packet header.
  • the embodiment further provides a BFER for receiving BIER control information.
  • the BFER includes a receiving module 601 and a decapsulation module 602, where:
  • the receiving module 601 is configured to receive a BIER data packet, and determine whether the packet header carries indication information for indicating that the BIER data packet carries control information.
  • the decapsulation module 602 is configured to directly decapsulate the control information sent in the packet body when the receiving module determines that the packet header carries the indication information for indicating the BIER data packet carrying control information. Control surface.
  • the above BFIR and BFER can together form a transmission system of BIER control information.
  • the above device is a device corresponding to the transmission method of the BIER control information in the first embodiment. All the implementation manners in the foregoing method embodiments are applicable to the embodiment of the device, and the same technical effects can be achieved.
  • This example is an example of encapsulating and transmitting a packet carrying control information in a BIER data packet format when the border node needs to communicate with each other.
  • the border node BFIR1 of Figure 1 has a multicast group that is added locally.
  • the source node obtains the bit string of the border node that needs to communicate according to the user configuration or the control plane information delivered or distributed by the controller. For example, the node to be received is BFER1 and BFER2, the bits mapped by these two nodes will be set in the bitstring.
  • the BFIR1 is extended according to the control plane message format shown in FIG. 7 or a similar format.
  • the type value in the format of FIG. 7 is used to indicate that this is a locally joined multicast group information packet, and the format is locally added.
  • the multicast group information is carried in the BIER packet header as shown in FIG. 3, and the value of the proto field in FIG. 3 is set to a newly defined value, for example, 7 to indicate that the control plane packet is carried later. Need to send information on the control surface.
  • the BTER1 and the BFER2 which are the bit mapping nodes in the bitstring, parse the bit string and include the self-set message, parse the message, and determine the control plane message according to the value of the proto field.
  • the control plane is sent to the control plane to parse the control plane packet. If the type value of the control plane packet format is 1 (this type is only an example, the type can also be preset to other values), indicating that the multicast group joins the information, thereby controlling Obtain information about the join status of the multicast group of the corresponding remote node.
  • BFER1 and BFER2 After acquiring the multicast group information added to BFIR1, BFER1 and BFER2 generate an information mapping table of the corresponding multicast group export to BFIR1.
  • This example is to pass the BIER data packet format when a new multicast group is added or canceled.
  • the installed control information issues a new multicast group condition to the remote end.
  • the format of the control plane packet to which the multicast group joins can be the same as that of the control plane packet in the example 1.
  • the remote end updates the local multicast information mapping table according to the received control information.
  • a new control plane message type can be issued, or the message format similar to that in Figure 7 used in Example 1 can be used and passed.
  • the proto field in the header of Figure 3BIER indicates that a BIER message is a control plane message.
  • the remote end determines that the BIER message is carried according to the setting of the proto field. Controlling the packet, parsing the control plane packet, determining the control message as the revoked multicast group information, and deleting the information mapping table of the corresponding multicast group entry according to the type value in the packet.
  • the entry For the normal maintenance of the multicast group entry information of the remote node, when the corresponding multicast group traffic is received and sent, the entry will be maintained continuously. When the traffic of the multicast group is not received for a period of time or When the aging time of the entry is reached, the entry is cleared.
  • the MIER control information is encapsulated and carried in the BIER data packet format.
  • the border node BFIR1 has a multicast VPN that is added locally, and the bit string of the border node that needs to communicate is obtained according to the user configuration, the centralized or distributed control plane of the controller, and the nodes that need to be received are BFER1 and BFER2. , the bits mapped by these two nodes will be set in the bitstring.
  • the BFIR1 carries the MVPN information in the control plane packet format or the similar format as shown in FIG. 7, and carries the information about the multicast group-related VPN-related messages, such as the RD, the leaf route, and the source route, in the BIER data packet, where The value of the proto field in the BIER header is defined as a new value, such as 7, which is used to indicate that the subsequent carrying message is a control plane message.
  • the BTER1 and BFER2 which are the bit mapping nodes in the bitstring, parse the bit string and include the self-set message, parse the message, and read the proto field to 7 to directly parse the message body.
  • Control surface message send it to the control surface, control surface to resolve the control
  • the type value is 10 (here, for example, the type can also be preset to other values) to represent the multicast VPN related information, so that the control plane obtains the information of the corresponding multicast VPN.
  • BFER1 and BFER2 When acquiring the multicast VPN information added to BFIR1, BFER1 and BFER2 generate an information mapping table of the corresponding multicast group exit to BFIR1.
  • 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. / instruction to achieve its corresponding function.
  • Embodiments of the invention are not limited to any specific form of combination of hardware and software.
  • the multicast-related access information is only perceived by the border node, and is transparently transmitted to the intermediate forwarding node, which saves the time and mechanism for processing the memory occupation of the intermediate forwarding node, and at the same time, due to the control information. Sharing only between boundary nodes avoids information leakage on unrelated nodes.

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Abstract

本发明实施例公开了一种BIER控制信息的传输方法、装置和系统。所述方法包括：比特转发入口路由器BFIR构造BIER数据报文，在报文头中携带用于指示本BIER数据报文携带控制信息的指示信息，在报文体中携带所述控制信息。所述系统包括比特转发入口路由器BFIR和比特转发出口路由器BFER。所述BFIR包括第一构造模块和第二构造模块。所述BFER包括接收模块和解封装模块。

Description

一种BIER控制信息的传输方法、装置和系统 技术领域
本发明实施例涉及但不限于网络通信技术，尤其涉及组播领域的BIER(Bit Indexed Explicit Replication，基于位索引的显式复制)技术中，一种控制信息的传输方法、装置和系统。
背景技术
IP组播技术实现了IP网络中点到多点的高效数据传送。能够有效地节约网络带宽、降低网络负载，所以在实时数据传送、多媒体会议、数据拷贝、IPTV(交互式网络电视)、游戏和仿真等诸多方面都有广泛的应用。组播技术一般采用PIM(Protocol Independent Multicast，协议无关组播)协议(包括协议无关组播－稀疏模式(PIM-SM)和协议无关组播－密集模式(PIM-DM))、MSDP(Multicast Source Discovery Protocol，组播源发现协议)等实现，这些组播协议的一个共同的特点是需要构建一种控制平面组播树，利用这种组播树将网络平面逻辑排列为树状，以实现组播转发的点到多点数据转发和环路避免等，这种以构建分发树为核心的组播路由协议的中间节点都需要维护复杂的组播转发信息的状态，随着网络的规模越来越大，组播数据流量与日俱增的情况下，这种组播技术面临越来越大的成本和运维方面的挑战。
为此，业界提出了一种新的用于构建组播转发路径的技术，称为BIER(Bit Indexed Explicit Replication，基于位索引的显式复制)技术，该技术提出了一种新的不需要构建组播分发树的组播技术架构，如图1所示，支持BIER技术的路由器称为BFR(Bit-Forwarding Router，比特转发路由器)，由BFR组成的一个组播转发域称为BFR domain，在BIER域的边缘，对用户的组播数据进行BFIR封装的设备称为BFIR(Bit-Forwarding ingress Router，比特转发入口路由器)，解封装BIER数据报文的边缘BFR设备称为BFER(Bit-Forwarding egress Router，比特转发出口路由器)，组播数据由BFIR封装进入BIER域，在BIER域中依赖于BIER的头部进行转发，而经由一个或 者多个BFER设备离开BIER域，BIER域中，接收并转发BIER报文的设备称为该BIER报文的transit(转发)BFR。一个BFR根据封装和解封装报文的不同可以既是BFIR角色，又可以是BFER角色。
在BIER域中，给每台BFR(中间转发节点可以分配也可以不分配)分配一个在整个BIER sub-domain(子域)中全局唯一的bit position(比特位置)，每台BFER将自己的bit position使用IGP(Interior Gateway Protocol，内部网关协议)协议在BIER域中泛洪，所有的bit position组成一个bitstring(比特串)，数据报文在BIER域中的传递和路由依赖于bitstring。当其他的BFR收到了包含有BIER的报文头时，根据BIER报文头中携带的bitstring，基于Bit Forwarding Table(比特转发表或称位索引转发表)进行转发。这种基于BIER bit位进行转发的原理将以前需要基于构建组播分发树的转发改为使用位标识进行单播查找转发的方式转发组播，大大减少网络的转发成本。
图2描述了BIER转发的过程，BFR1为ingress BFR即BFIR，BFR5、BFR6及BFR7都为egress BFR即BFER，三个BFR的bit position分别为0001，0010，0100。Egress BFR事先通过IGP协议(如IS-IS(Intermediate system to intermediate system，中间系统到中间系统)协议，或者OSPF(Open Shortest Path First，开放式最短路径优先)协议)在BIER域中通告其自身的bit position，BFR1收到了BFR5、BFR6和BFR7的bit position的通告后，在本地的位索引转发表中保存这些信息。当BFR1收到了组播报文，假定该组播报文需要传输到BFR5和BFR6，则BFR1根据事先保存的映射关系，计算得出该报文的Bitstring的值为0101，将用户的组播报文封装为BIER报文，其中BIER Header中的Bitstring填充0101并转发到BFR2，BFR2收到报文后，查找事先保存的位索引转发表中的条目，根据条目，报文需要转发到BFR3，然后将Bitstring跟该匹配的条目项的F-BM(Forwarding Bit Mask，转发比特掩码表)做与操作，得到0101，BFR2以0101作为BIER Header中的Bitstring重新填充BIER报文，并将报文转发到BFR3，BFR3收到了该报文后，查找自己的位索引转发表，BFR3有2个条匹配记录，分别代表报文下一跳转发到BFR4和BFR6，对于第一个条目，BFR3将Bitstring的值跟条目中的F-BM做与操作，得到结果为0001，第二个条目中，Bitstring的值跟F-BM做与操作的结果为0100， 则BFR3将报文分别从2个接口转发BIER报文到BFR4和BFR6，其中BFR4的BIER Header的Bitstring的值为0001，而转发到BFR6的BIER Header的Bitstring的值为0100。对于到达BFR6的报文，发现bitstring的值跟自己通告的bit position一样，表示自己为该报文的目的地，解封装BIER报文。而到达报文到达BFR4时，依次前述的转发原理，将报文转发到BFR5，由BFR5解封装BIER报文，至此，完成了组播报文在BIER域中的传输，将组播报文由入口的BFR1节点转发到组播的接收节点BFR4和BFR6。
相关技术中的BIER控制消息的发布是通过扩展的IGP或BGP(Border Gateway Protocol，边界网关协议)来进行发布的，如IGP协议会将消息洪泛至整个BIER域的BFR的所有节点，且要在边界节点间建立相应的通道，对于IGP协议来讲或BIER来讲，需要相应扩展。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供了一种BIER控制信息的传输方法、装置和系统，能够简单高效的传输控制信息，避免控制信息的洪泛。
本发明实施例提供的一种基于位索引的显式复制BIER控制信息的传输方法，包括：
比特转发入口路由器BFIR构造BIER数据报文，在报文头中携带用于指示本BIER数据报文携带控制信息的指示信息，在报文体中携带所述控制信息。
可选地，所述方法还包括：所述BFIR在报文头中携带需要接收所述BIER数据报文的比特转发出口路由器BFER的比特串bitstring；以及，构造BIER数据报文完成后，所述BFIR向所在BIER域的下级节点发送所述BIER数据报文。
可选地，所述方法还包括：收到所述BIER数据报文的BFER根据报文头中携带的用于指示本BIER数据报文携带控制信息的指示信息，直接解封 装出报文体中的控制信息上送控制面。
可选地，其中，所述控制信息包括以下之一：所述BFIR加入的组播组信息，撤销的组播组信息，加入组播虚拟专用网络VPN的信息。
可选地，其中，所述指示信息通过BIER报文头中的协议proto字段值来标识。
本发明实施例还提供了一种比特转发入口路由器BFIR，设置为发送基于位索引的显式复制BIER控制信息，所述BFIR包括第一构造模块和第二构造模块，其中：
所述第一构造模块，设置为在构造BIER数据报文时，在报文头中携带用于指示本BIER数据报文携带控制信息的指示信息；
所述第二构造模块，设置为在构造BIER数据报文时，在报文体中携带所述控制信息。
可选地，其中，所述控制信息包括以下之一：所述BFIR加入的组播组信息，撤销的组播组信息，加入组播虚拟专用网络VPN的信息。
可选地，其中，所述第一构造模块在报文头中携带用于指示本BIER数据报文携带控制信息的指示信息，包括：所述第一构造模块在报文头的协议proto字段中携带所述用于指示本BIER数据报文携带控制信息的指示信息。
本发明实施例还提供了一种比特转发出口路由器BFER，设置为接收基于位索引的显式复制BIER控制信息，所述BFER包括接收模块和解封装模块，其中：
所述接收模块，设置为接收BIER数据报文，判断所述报文头中是否携带用于指示本BIER数据报文携带控制信息的指示信息；
所述解封装模块，设置为在所述接收模块判断所述报文头中携带用于指示本BIER数据报文携带控制信息的指示信息时，直接解封装出报文体中的控制信息上送控制面。
可选地，其中，所述控制信息包括以下之一：所述BFIR加入的组播组信息，撤销的组播组信息，加入组播虚拟专用网络VPN的信息。
本发明实施例还提供了一种BIER控制信息的传输系统，包括上述比特转发入口路由器BFIR以及比特转发出口路由器BFER。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令用于实现上述方法。
采用本发明实施例所述方案，组播相关的接入信息只在边界节点感知，对于中间转发节点是透明传输的，节约了中间转发节点的内存占用处理的时间和机制，同时，由于控制信息只在边界节点间的共享，避免了在不相关节点上的信息泄漏。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1是相关技术中BIER技术组网图；
图2是相关技术中BIER技术转发过程图；
图3是相关技术中BIER报文头示意图；
图4是本发明实施例一流程图；
图5为本发明实施例二BFIR结构示意图；
图6为本发明实施例二BFER结构示意图；
图7是一种控制面报文格式示意图。
本发明的实施方式
如背景技术中所述，相关技术中的BIER控制消息的发布是通过扩展的IGP或BGP来进行发布的，如IGP协议会将消息洪泛至整个BIER域的BFR的所有节点。而对于某些控制消息来讲，如边界有哪些组播组地址接入，或 者边界加入的是哪些VPN(Virtual Private Network，虚拟专用网络)相关的信息，这些仅需在边界节点间交互的信息对于中间转发节点来讲是没有必要学习到的，而相关技术中的洪泛机制，并不能解决这一点。
下文中将结合附图对本发明实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行。并且，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
实施例一
本实施例提供一种BIER控制信息的传输方法，如图4所示，包括以下步骤：
步骤401，BFIR构造BIER数据报文时，在报文头中携带用于指示本BIER数据报文携带控制信息的指示信息；
步骤402，BFIR构造BIER数据报文时，在报文体中携带所述控制信息。
可选地，在上述步骤401中，BFIR构造BIER数据报文时，还在报文头中携带需要接收所述BIER数据报文的BFER的bitstring，在上述步骤402之后，在构造BIER数据报文完成后，所述BFIR向所在BIER域的下级节点发送所述BIER数据报文。收到所述BIER数据报文的BFER根据报文头中携带的用于指示本BIER数据报文携带控制信息的指示信息，直接解封装出报文体中的控制信息上送控制面。所述控制面是指对数据报文进行控制管理的平面。
上述控制信息包括但不限于以下之一：所述BFIR加入的组播组信息，撤销的组播组信息，加入组播虚拟专用网络VPN的信息。
可选地，所述指示信息通过协议proto(protocol，协议)字段携带。图3所示为BIER数据报文的报文头封装(携带该报文头封装的报文简称为BIER报文)，当前BIER封装后携带的报文类型(4bits长度的proto)总共有6种，包括两种MPLS报文、IPv4(互联网协议第四版)报文、IPv6(互联网协议第六版)报文、BIER OAM(Operation Administration and Maintenance，操作、 管理和维护)报文及以太报文。在本实施例中，将图3中proto字段值定义为新值，例如7(此处仅为举例，除此之外，也可以是其他值)，来表示后续携带的是控制信息，并在BIER报文头后面携带控制面报文，该控制面报文中携带了需要通告到对端的控制信息，如边界节点间需要互相交互的自身加入的组播组信息，或者组播vpn相关的信息等。
通过本实施例，组播相关的接入信息只在边界节点感知，对于中间转发节点是透明传输的，节约了中间转发节点的内存占用处理的时间和机制，同时，由于控制信息只在边界节点间的共享，避免了在不相关节点上的信息泄漏。
实施例二
本实施例提供一种用于发送BIER控制信息的BFIR，如图5所示，所述BFIR包括第一构造模块501和第二构造模块502，其中：
所述第一构造模块501，设置为在构造BIER数据报文时，在报文头中携带用于指示本BIER数据报文携带控制信息的指示信息；
所述第二构造模块502，设置为在构造BIER数据报文时，在报文体中携带所述控制信息。
其中，所述第一构造模块501在报文头中携带用于指示本BIER数据报文携带控制信息的指示信息，包括：
所述第一构造模块501在报文头的协议proto字段中携带所述用于指示本BIER数据报文携带控制信息的指示信息。
本实施例还提供一种用于接收BIER控制信息的BFER，如图6所示，所述BFER包括接收模块601和解封装模块602，其中：
所述接收模块601，设置为接收BIER数据报文，判断所述报文头中是否携带用于指示本BIER数据报文携带控制信息的指示信息；
所述解封装模块602，设置为在所述接收模块判断所述报文头中携带用于指示本BIER数据报文携带控制信息的指示信息时，直接解封装出报文体中的控制信息上送控制面。
上述BFIR以及BFER可共同组成一种BIER控制信息的传输系统。
需要说明的是，上述装置是与实施例一中BIER控制信息的传输方法对应的装置，上述方法实施例中所有实现方式均适用于本装置的实施例中，也能达到相同的技术效果。
下面通过应用实施例来进行说明。
应用示例1
本示例为当边界节点上需要互相通讯其所在节点接入的组播组信息时，在BIER数据报文格式中封装携带控制信息的报文并发送的示例。
如图1的边界节点BFIR1在本地有加入的组播组，源节点根据用户配置或控制器集中下发或分布式的控制面信息获取到需要通信的边界节点的bitstring，例如需要接收的节点为BFER1和BFER2，则这两个节点映射的bit会在bitstring中置位。
BFIR1按如图7所示的控制面报文格式或者类似的格式扩展，图7格式中的type值用于表明这是一个本地加入的组播组信息的报文，将该格式即本地加入的组播组信息携带在如图3所示的BIER报文头后面，并将图3中proto字段值设置为一个新定义的值，例如7，用于表示后续携带的是控制面报文也即需要上送控制面的信息。
所述bitstring中置位bit映射的节点即BFER1和BFER2接收到该BIER报文后，解析bitstring中包含自身置位消息后，解析该报文，根据proto字段的值确定解析出控制面报文，上送控制面，解析控制面报文，如果控制面报文格式中type值为1(此处仅为举例，该type也可以预置为其他值)则表示组播组加入信息，由此控制面获取到相应远端节点的组播组加入情况的信息。
BFER1和BFER2在获取到BFIR1上加入的组播组信息后，生成相应组播组出口至BFIR1的信息映射表。
应用示例2
本示例为当有新的组播组加入或取消时，通过BIER数据报文格式中封 装的控制信息发布新的组播组情况给远端。
有组播组加入的控制面报文格式可以和示例1中的控制面报文一致，远端根据接收的控制信息更新本地的组播信息映射表。
当有组播组取消时，若认为有需要及时通知远端节点，则可发布一个新的控制面报文类型，或采用示例1中用到的类似图7中的报文格式，并通过对图3BIER报文头中proto字段的置位来表明BIER报文中通告的是一个控制面报文，远端收到BIER报文后根据其中的proto字段的置位确定本BIER报文中携带了控制面报文，解析出该控制面报文，根据报文中的type值确定该控制消息为撤销的组播组信息，删除相应组播组条目的信息映射表。
对于远端节点的组播组表项信息的正常维护，在有相应的组播组流量的接收及发送时，表项会持续维护，当有一段时间的该组播组的流量未被接收或发送时，待表项老化时间到，清除该表项。
应用示例3
本示例为当边界节点上需要互相通讯本地MVPN(组播VPN)相关控制信息时，如RT信息或RD信息或MVPN下的路由消息，在BIER数据报文格式中封装携带MVPN控制信息。
如图1的边界节点BFIR1在本地有加入的组播VPN，根据用户配置、控制器集中下发或分布式的控制面获取到需要通信的边界节点的bitstring，如需要接收的节点为BFER1和BFER2，则这两节点映射的bit会在bitstring中置位。
BFIR1按如图7所示的控制面报文格式或者类似的格式携带MVPN信息，将本地加入的组播组VPN相关消息如RD、叶子路由，源路由等信息携带在BIER数据报文中，其中BIER报文头中的proto字段值定义为新值，如7，用于表示后续携带的是控制面报文。
所述bitstring中置位bit映射的节点即BFER1和BFER2接收到该BIER报文后，解析bitstring中包含自身置位消息后，解析该报文，读到proto字段为7则直接解析报文体中的控制面报文，将其上送控制面，控制面解析该控 制面报文读报文格式中type值为10(此处仅为举例，该type也可以预置为其他值)表示组播VPN相关信息，由此控制面获取相应组播VPN的信息。
BFER1和BFER2在获取到BFIR1上加入的组播VPN信息时，生成相应组播组出口至BFIR1的信息映射表。
本领域的普通技术人员应当理解，可以对本发明实施例的技术方案进行修改或者等同替换，而不脱离本申请技术方案的精神和范围，均应涵盖在本申请的权利要求范围当中。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件(例如处理器)完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的各模块/单元可以采用硬件的形式实现，例如通过集成电路来实现其相应功能，也可以采用软件功能模块的形式实现，例如通过处理器执行存储于存储器中的程序/指令来实现其相应功能。本发明实施例不限制于任何特定形式的硬件和软件的结合。
工业实用性
采用本发明实施例所述方案，组播相关的接入信息只在边界节点感知，对于中间转发节点是透明传输的，节约了中间转发节点的内存占用处理的时间和机制，同时，由于控制信息只在边界节点间的共享，避免了在不相关节点上的信息泄漏。

Claims (11)

  1. 一种基于位索引的显式复制BIER控制信息的传输方法，包括：
    比特转发入口路由器BFIR构造BIER数据报文，在报文头中携带用于指示本BIER数据报文携带控制信息的指示信息，在报文体中携带所述控制信息。
  2. 根据权利要求1所述的方法，所述方法还包括：
    所述BFIR在报文头中携带需要接收所述BIER数据报文的比特转发出口路由器BFER的比特串bitstring；以及
    构造BIER数据报文完成后，所述BFIR向所在BIER域的下级节点发送所述BIER数据报文。
  3. 根据权利要求2所述的方法，所述方法还包括：
    收到所述BIER数据报文的BFER根据报文头中携带的用于指示本BIER数据报文携带控制信息的指示信息，直接解封装出报文体中的控制信息上送控制面。
  4. 根据权利要求1-3中任一项所述的方法，其中，
    所述控制信息包括以下之一：所述BFIR加入的组播组信息，撤销的组播组信息，加入组播虚拟专用网络VPN的信息。
  5. 根据权利要求1-3中任一项所述的方法，其中，
    所述指示信息通过BIER报文头中的协议proto字段值来标识。
  6. 一种比特转发入口路由器BFIR，设置为发送基于位索引的显式复制BIER控制信息，所述BFIR包括第一构造模块和第二构造模块，其中：
    所述第一构造模块，设置为在构造BIER数据报文时，在报文头中携带用于指示本BIER数据报文携带控制信息的指示信息；
    所述第二构造模块，设置为在构造BIER数据报文时，在报文体中携带所述控制信息。
  7. 根据权利要求6所述的BFIR，其中，
    所述控制信息包括以下之一：所述BFIR加入的组播组信息，撤销的组播组信息，加入组播虚拟专用网络VPN的信息。
  8. 根据权利要求6所述的BFIR，其中，所述第一构造模块在报文头中携带用于指示本BIER数据报文携带控制信息的指示信息，包括：
    所述第一构造模块在报文头的协议proto字段中携带所述用于指示本BIER数据报文携带控制信息的指示信息。
  9. 一种比特转发出口路由器BFER，设置为接收基于位索引的显式复制BIER控制信息，所述BFER包括接收模块和解封装模块，其中：
    所述接收模块，设置为接收BIER数据报文，判断所述报文头中是否携带用于指示本BIER数据报文携带控制信息的指示信息；
    所述解封装模块，设置为在所述接收模块判断所述报文头中携带用于指示本BIER数据报文携带控制信息的指示信息时，直接解封装出报文体中的控制信息上送控制面。
  10. 根据权利要求9所述的BFER，其中，
    所述控制信息包括以下之一：所述BFIR加入的组播组信息，撤销的组播组信息，加入组播虚拟专用网络VPN的信息。
  11. 一种BIER控制信息的传输系统，包括如权利要求6-8中任一项所述的比特转发入口路由器BFIR以及如权利要求9-10中任一项所述的比特转发出口路由器BFER。
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