WO2016188502A1 - 一种bier网络中流量工程信息通告的方法和装置 - Google Patents

一种bier网络中流量工程信息通告的方法和装置 Download PDF

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Publication number
WO2016188502A1
WO2016188502A1 PCT/CN2016/086605 CN2016086605W WO2016188502A1 WO 2016188502 A1 WO2016188502 A1 WO 2016188502A1 CN 2016086605 W CN2016086605 W CN 2016086605W WO 2016188502 A1 WO2016188502 A1 WO 2016188502A1
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bier
traffic engineering
information
sub
network
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PCT/CN2016/086605
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English (en)
French (fr)
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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 WO2016188502A1 publication Critical patent/WO2016188502A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/14Routing performance; Theoretical aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00Routing or path finding of packets in data switching networks
    • H04L45/16Multipoint routing

Definitions

  • This application relates to, but is not limited to, the field of network communication technology.
  • IP (Internet Protocol) 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.
  • the current multicast technology is generally based on the Protocol Independent Multicast (PIM) protocol (PIM-SM (Protocol Independent Multicast-Sparse Mode) and PIM-DM (Protocol Independent Multicast-Sparse). Mode, protocol-independent multicast-sparse mode), MSDP (Multicast Source Discovery Protocol), etc.
  • PIM Protocol Independent Multicast
  • Mode protocol-independent multicast-sparse mode
  • MSDP Multicast Source Discovery Protocol
  • the multicast tree uses the network plane logic as a tree to implement point-to-multipoint data forwarding and loop avoidance for multicast forwarding.
  • the intermediate nodes of the multicast routing protocol with the distribution tree as the core need to be complicated to maintain.
  • BIER technology Bit Indexed Explicit Replication
  • BIER domain A multicast forwarding domain consisting of BFR
  • BFIR Bit-Forwarding Ingress Router
  • BFER Bit-Forwarding egress Router
  • the multicast data is encapsulated by the BFIR into the BIER domain, and is forwarded in the BIER domain depending on the header of the BIER, and the BIER domain is exited via one or more BFER devices, and the BIER domain is received and forwarded in the BIER domain.
  • a BFR can be either a BFIR role or a BFER role, depending on the encapsulation and decapsulation messages.
  • the BFER of each edge is assigned a globally unique bit position (bit position) in the entire BIER sub-domain, and each BFER uses its own bit position using the IGP (Interior Gateway Protocol).
  • the gateway protocol is flooded in the BIER domain. All bit positions form a bit string (bit string).
  • bit string The transmission and routing of data packets in the BIER domain depends on the bit string.
  • the BIER carries the bit string carried in the BIER packet header based on the Bit Forwarding Table. 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.
  • the related art proposes a BIER packet forwarding process in the BIER domain.
  • BFR1 is ingress BFR
  • BFR5, BFR6 and BFR7 are both egress BFR
  • the bit positions of three BFRs are 0001, 0010, 0100, respectively.
  • Egress BFR advertises it 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.
  • 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 Bit string of the packet as 0101 based on the previously saved mapping relationship.
  • the packet is encapsulated into a BIER packet.
  • the Bit string 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. Then, the Bit string is ANDed with the F-BM of the matched entry, and 0101 is obtained.
  • BFR2 refills the BIER message with 0101 as the Bit string in the BIER Header, and forwards the message to BFR3, which is received by BFR3.
  • BFR3 look up its own bit index forwarding table.
  • BFR3 has two matching records, which represent the next hop of the message and forward it to BFR4 and BFR6.
  • BFR3 will match the value of the Bit string with the entry.
  • the F-BM does the operation and the result is 0001.
  • the value of the Bit string and the result of the F-BM operation are 0100, then the BFR3 forwards the BIER message from the two interfaces to the BFR4.
  • BFR6 its The value of the Bit string of the BIER Header in BFR4 is 0001, and the value of the Bit string of the BIER Header forwarded to BFR6 is 0100.
  • the value of the bit string 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 technology uses a bit indexing method to convert the traditional multicast forwarding mode that needs to construct a multicast distribution tree into a bit string similar to unicast forwarding, so the BIER technology can be conveniently implemented.
  • the present application provides a method and device for traffic engineering information notification in a BIER network.
  • a bit index display method for copying traffic engineering information notifications in a BIER network including:
  • the information of the BIER is flooded in the BIER network, so that the router that receives the information of the BIER calculates the traffic engineering path according to the carried traffic engineering parameters.
  • the traffic engineering parameter information includes one or more of the following: management group information, maximum link bandwidth, maximum reserved link bandwidth, traffic engineering cost, and unreserved bandwidth, where the management group information includes the following one or Multiple: sub-domain ID sub-domain ID, bit forwarding router identifier BFR-ID, bit forwarding router prefix BFR-Prefix, link coloring, resource level.
  • the format of the constructed traffic engineering parameters includes the parameter type, the byte length, and the maximum link bandwidth.
  • the format of the constructed traffic engineering parameters includes the parameter type, the byte length, and the maximum reserved bandwidth.
  • the method is applied to a bit forwarding router BFR.
  • a bit index display method for copying traffic engineering information notifications in a BIER network including:
  • the traffic engineering path includes a bit string forwarding path based on traffic engineering.
  • Receiving the information of the flooded BIER in the BIER network including: receiving the link state protocol data unit LSP message flooded in the BIER network or BIER info sub-tlv in the link state advertisement LSA message;
  • Calculating the traffic engineering path according to the traffic engineering parameter carried by the information of the BIER including: calculating the traffic engineering path according to the shortest path algorithm based on the constraint, according to the received traffic engineering parameter carried by the BIERinfo sub-tlv.
  • the method is applied to a bit forwarding router BFR.
  • the building module is configured to: construct a traffic engineering parameter according to the configured traffic parameter value;
  • Inserting a module setting: filling the traffic engineering parameters into the BIER information
  • the flooding module is configured to: flood the information of the BIER in the BIER network, so that the router that receives the information of the BIER calculates the traffic engineering path according to the carried traffic engineering parameter.
  • the building module constructs traffic engineering parameters according to the configured traffic parameter values, including:
  • the format of the constructed traffic engineering parameters includes the parameter type, the byte length, and the maximum link bandwidth.
  • the format of the constructed traffic engineering parameters includes the parameter type, the byte length, and the maximum reserved bandwidth.
  • the flooding module floods the BIER information in the BIER network, including: using the internal gateway protocol IGP, and advertising the BIER info sub-tlv to the LSA message through the link state protocol data unit LSP packet or the link state. Flooding in the BIER network.
  • the traffic engineering parameter information includes one or more of the following: management group information, maximum link bandwidth, maximum reserved link bandwidth, traffic engineering cost, and unreserved bandwidth, where the management group information includes the following one or Multiple: sub-domain ID sub-domain ID, bit forwarding router identifier BFR-ID, bit forwarding router prefix BFR-Prefix, link coloring, resource level.
  • a bit index display device for copying traffic engineering information notifications in a BIER network including:
  • the receiving module is configured to: receive information of the flooded BIER in the BIER network;
  • the path module is configured to: calculate a flow according to the traffic engineering parameter carried by the information of the BIER Volume engineering path.
  • the receiving module receives the information of the flooded BIER in the BIER network, including: receiving the link state protocol data unit LSP message flooded in the BIER network or the BIER info sub-tlv in the link state advertisement LSA message;
  • the path module calculates the traffic engineering path according to the traffic engineering parameter carried by the information of the BIER, including: calculating the traffic engineering based on the received traffic engineering parameter carried by the BIER info sub-tlv and the shortest path algorithm based on the constraint condition path.
  • the method and device for advertising traffic engineering information in a BIER network extend the traffic engineering parameter information of the IGI protocol carrying the BIER network, and the BFR router calculates the bit string forwarding path based on the traffic engineering according to the traffic engineering parameter information.
  • the calculation function of the path of the traffic engineering in the BIER network can be realized, and the notification method of the traffic engineering parameter can also be used for the services and requirements of the policy routing, the specified path calculation, and the like in the BIER network.
  • FIG. 1 is a network diagram of the BIER technology
  • FIG. 3 is a flowchart of a method for advertising traffic engineering information in a BIER network according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for reporting traffic engineering information in another BIER network according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of an apparatus for advertising traffic engineering information in a BIER network according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of an apparatus for reporting traffic engineering information in another BIER network according to an embodiment of the present invention.
  • Figure 7 is a schematic diagram of the structure of the ISIS BIER info sub tlv;
  • FIG. 8 is a schematic structural diagram of an OSPF BIER sub-tlv
  • FIG. 9 is a schematic structural diagram of a BIER Maximum Link Bandwidth sub sub-tlv according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of an ISIS protocol traffic engineering parameter notification according to an embodiment of the present invention.
  • FIG. 11 is a flow chart of an ISIS traffic engineering parameter notification according to an embodiment of the present invention.
  • an embodiment of the present invention provides a method for advertising traffic information information in a BIER network, which is applied to the BFR, and includes:
  • the BIER information may be in a Sub-TLV (subtype-length-value) format, which is referred to as BIER info sub-tlv.
  • the BIER info sub-tlv includes one or more of the following: a management group Information, maximum link bandwidth, maximum reserved link bandwidth, traffic engineering cost, unreserved bandwidth.
  • the management group information includes one or more of the following: a sub-domain identifier sub-domain ID, a bit forwarding router identifier BFR-ID, a bit forwarding router prefix BFR-Prefix, a link coloring, and a resource level.
  • the extended IS-IS protocol adds a sub sub-TLV for carrying BIER traffic engineering parameters, and the sub sub-TLV is called ISIS bier traffic engineering sub sub-TLV, carried by IS-IS BIER info sub-tlv:
  • the ISIS bier traffic engineering sub sub-TLV includes one or more of the following: an administrative group information, a maximum link bandwidth, and a maximum reserved link bandwidth (Maximum Reservable). Link bandwidth), traffic engineering metric, Unreserved bandwidth.
  • the extended OSPF protocol adds an OSPF bier traffic engineering sub sub-TLV for carrying BIER traffic engineering parameters, and the sub sub-tlv is used by OSPF.
  • BIER sub-tlv carries:
  • the OSPF bier traffic engineering sub sub-TLV includes one or more of the following: an administrative group information, a maximum link bandwidth, and a maximum reserved link bandwidth (Maximum Reservable link). Bandwidth), traffic engineering metric, unreserved bandwidth, etc.
  • Step S101 includes:
  • the format of the constructed traffic engineering parameters includes the parameter type, the byte length, and the maximum link bandwidth.
  • the format of the constructed traffic engineering parameters includes the parameter type, the byte length, and the maximum reserved bandwidth.
  • flooding the BIER info sub-tlv in the BIER network includes: flooding the BIER info sub-tlv with the internal gateway protocol IGP in the BIER network, optionally, the BIER info The sub-tlv floods the BIER network through the link state protocol data unit LSP message or the link state advertisement LSA message.
  • an embodiment of the present invention provides a method for advertising traffic information information in a BIER network, which can be applied to a BFR, including:
  • the BIER info sub-tlv can be carried in the link state protocol data unit LSP message or the link state advertisement LSA message.
  • the traffic engineering path may include a traffic engineering based bit string forwarding path.
  • step S202 includes:
  • the traffic engineering path is calculated based on the shortest path algorithm of the constraint condition according to the traffic engineering parameter carried in the BIER info sub-tlv in the received link state protocol data unit LSP message or the link state advertisement LSA message.
  • an embodiment of the present invention provides a device for advertising traffic engineering information in a BIER network, which can be set in the BFR, and includes:
  • the building module is configured to: construct a traffic engineering parameter according to the configured traffic parameter value;
  • Inserting a module setting: filling the traffic engineering parameter into a bit index to display the copied information (hereinafter, BIER info sub-tlv is taken as an example);
  • the flooding module is configured to: flood the BIER info sub-tlv in-place index display replication BIER network, so that the router receiving the BIER info sub-tlv calculates the traffic engineering path according to the carried traffic engineering parameter.
  • the building module constructs traffic engineering parameters according to the configured traffic parameter values, including:
  • the format of the constructed traffic engineering parameters includes the parameter type, the byte length, and the maximum link bandwidth.
  • the format of the constructed traffic engineering parameters includes the parameter type, the byte length, and the maximum reserved bandwidth.
  • the flooding module floods the BIER info sub-tlv in the BIER network, including: flooding the BIER info sub-tlv in the BIER network by using an internal gateway protocol IGP.
  • the BIER info sub-tlv is flooded in the BIER network by using a link state protocol data unit LSP packet or a link state advertisement LSA message.
  • the traffic engineering parameter information includes one or more of the following: management group information, maximum link bandwidth, maximum reserved link bandwidth, traffic engineering cost, and unreserved bandwidth, where the management group information
  • the method includes one or more of the following: a sub-domain identifier sub-domain ID, a bit forwarding router identifier BFR-ID, a bit forwarding router prefix BFR-Prefix, a link coloring, and a resource level.
  • the embodiment of the present invention further provides a device for advertising traffic engineering information in a BIER network, which can be set in the BFR, and includes:
  • the receiving module is configured to: receive a bit index of the flooding in the BIER network, and display the copied information, such as BIER info sub-tlv;
  • the path module is configured to: calculate a traffic engineering path according to the traffic engineering parameter carried by the BIER info sub-tlv.
  • the receiving module receives the information of the flooded BIER in the BIER network, including: receiving the link state protocol data unit LSP message flooded in the BIER network or BIER info in the link state advertisement LSA message Sub-tlv; calculating, by the path module, the traffic engineering path according to the traffic engineering parameter carried by the BIER info sub-tlv, including: according to the received traffic engineering parameter carried by the BIER info sub-tlv, and based on the shortest constraint condition
  • the path algorithm calculates the traffic engineering path.
  • the ISIS protocol uses the ISIS protocol as the control plane protocol to construct the forwarding infrastructure of the BIER
  • the ISIS protocol advertises the sub-domain ID and the BFR identifier (BFR-ID) through the ISIS BIER Info sub-tlv shown in Figure 7.
  • the necessary information such as the BFR prefix (BFR-Prefix), BIER info sub-tlv is carried by TLV 235/TLV 237, and TLV 135/TLV 236.
  • ISIS uses this information to construct a BIER bit index forwarding information table based on the shortest path tree algorithm. These parameters can only be used to build the basic shortest path based forwarding information table. When BIER needs to support traffic engineering, other additional parameter information is needed to construct a constraint-based forwarding information table.
  • the number information includes an Administrative Group, a maximum link bandwidth, a Maximum Reservable link bandwidth, a traffic engineering metric, an Unreserved bandwidth, and the like. .
  • This embodiment proposes a format definition of the traffic engineering parameter information, as shown in FIG. 9 is a format diagram of a maximum link bandwidth sub sub-tlv, in which FIG. 9:
  • the type field is set to: indicating the type of the sub sub-tlv, indicating that the sub sub-tlv is the traffic engineering parameter of the maximum link bandwidth parameter, 8 bits;
  • the Length field indicates the total length of the sub sub-tlv, 16 bits
  • the Maximum Link Bandwidth field is the value of the maximum link bandwidth. The specific value needs to be allocated by IANA in bytes per second and 32 bits.
  • the Maximum link bandwidth sub sub-tlv is padded to the ISIS BIER info sub-tlv and advertised in the network when the router floods the LSP.
  • traffic engineering parameter information such as management group, maximum reserved link bandwidth, traffic engineering cost and other parameter information format definitions are similar to those in Figure 9, with different type values to represent different parameter information, these traffic engineering parameters
  • the sub sub-tlv of the information is filled into the ISIS BIER info sub-tlv.
  • the existing OSPF protocol advertises the sub-domain ID, BFR-ID, BFR-Prefix, etc. through the OSPF BIER sub-tlv shown in Figure 8.
  • Information, BIER sub-tlv is carried by the Extended Prefix TLV.
  • OSPF uses this information to construct a BIER bit index forwarding information table based on the shortest path tree algorithm. These parameters can only be used to build the basic shortest path based forwarding information table.
  • the traffic engineering parameter information includes an Administrative Group, a maximum link bandwidth, a Maximum Reservable link bandwidth, a traffic engineering metric, and an unreserved bandwidth. Bandwidth) and so on.
  • the format definition of the traffic engineering parameter information carried in the OSPF protocol is similar to the format defined in Embodiment 1.
  • the format map of the Maximum Link Bandwidth sub sub-tlv is also shown in FIG. 9, and the description and function of the field are also The same, no longer elaborated here.
  • This embodiment details the flow of traffic engineering parameters in the IGP network, as shown in Figures 10 and 11.
  • BFR1 constructs a traffic engineering parameter sub sub-tlv according to the configured traffic parameter value. If the maximum link bandwidth parameter needs to be advertised, the BIER Maximum Link Bandwidth sub sub-tlv is constructed according to the format shown in Figure 9. When the bandwidth is left, the BIER Maximum Reservable link bandwidth sub sub-tlv is constructed. The sub sub-tlv of other parameter information is similarly constructed. BFR1 fills the constructed traffic engineering parameter information sub sub-tlv into BIER info sub-tlv. BFR1 floods the BIER network with the filled BIER info sub-tlv through the LSP;
  • the BFR2 router in the BIER network receives the LSP packet advertised by the BFR1, and constructs a traffic engineering path based on the constraint-based shortest path algorithm (CSPF) according to the parameter information carried in the LSP.
  • CSPF constraint-based shortest path algorithm
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.
  • the device/function module/functional unit in the above embodiment can be implemented by using a general-purpose computing device. Now, they can be concentrated on a single computing device or distributed over a network of multiple computing devices.
  • the device/function module/functional unit in the above embodiment When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the scheme of the embodiment of the present invention extends the traffic engineering parameter information of the BIER network carried by the IGP protocol, and the BFR router calculates the bit string forwarding path based on the traffic engineering according to the traffic engineering parameter information, and can implement the path of the traffic engineering in the BIER network.
  • the calculation function of the traffic engineering parameter can also be used for services and requirements such as policy routing and path calculation in the BIER network.

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Abstract

本申请提出一种BIER网络中流量工程信息通告的方法和装置,涉及网络通信技术领域,包括:根据配置的流量参数值构建流量工程参数;将所述流量工程参数填充到位索引显示复制的信息BIERinfo sub-tlv中;将所述BIER info sub-tlv在位索引显示复制BIER网络中泛洪,使得接收到所述BIER info sub-tlv的路由器根据携带的流量工程参数计算流量工程路径。扩展IGP协议携带BIER网络的流量工程参数信息,BFR路由器根据流量工程参数信息计算基于流量工程的比特串转发路径,可以实现BIER网络中流量工程的路径的计算功能。

Description

一种BIER网络中流量工程信息通告的方法和装置 技术领域
本申请涉及但不限于网络通信技术领域。
背景技术
IP(Internet Protocol,网络互连协议)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。现在的组播技术一般采用PIM(Protocol Independent Multicast,协议无关组播)协议(包括PIM-SM(Protocol Independent Multicast-Sparse Mode,协议无关组播-稀疏模式)、PIM-DM(Protocol Independent Multicast-Sparse Mode,协议无关组播-稀疏模式))、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技术(Bit Indexed Explicit Replication,位索引显示复制),该技术提出了一种新的不需要构建组播分发树的的组播技术架构,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BIER domain,在BIER域的边缘,对用户的组播数据进行BIER封装的设备称为BFIR(Bit-Forwarding ingress Router,位转发入口路由器),解封装BIER数据报文的边缘BFR设备称为BFER(Bit-Forwarding egress Router,位转发出口路由器),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 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,给每台边缘的BFER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)在BIER domain域中泛洪,所有的bit position组成一个比特串bit string(位串),数据报文在BIER域中的传递和路由依赖于bit string。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bit string基于Bit Forwarding Table(位转发表)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。
相关技术提出了在BIER域中BIER报文转发的流程,如图2所示,假定BFR1为ingress BFR,BFR5、BFR6及BFR7都为egress BFR,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 domain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Bit string的值为0101,将用户的组播报文封装为BIER报文,其中BIER Header中的Bit string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Bit string跟该匹配的条目项的F-BM做与操作,得到0101,BFR2以0101作为BIER Header中的Bit string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Bit string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,Bit string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Bit string的值为0001,而转发到BFR6的BIER Header的Bit string的值为0100。对于到达BFR6的报文,发现bit string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。
从以上的BIER转发原理可以看出,BIER技术采用位索引的方式,将传统的需要构建组播分发树的组播转发方式转化为位串类似于单播转发的方式,因此BIER技术可以方便实现传统单播路由的一些功能,如单播的流量工程,快速重路由等,但现有的BIER技术只能实现基本的位串转发功能,而对于像流量工程、快速重路由等扩展的业务支持,还没有解决方案。
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。
本申请为了解决现有BIER网络中流量工程参数、路径和信息通告的问题,提供一种BIER网络中流量工程信息通告的方法和装置。
一种位索引显示复制BIER网络中流量工程信息通告的方法,包括:
根据配置的流量参数值构建流量工程参数;
将所述流量工程参数填充到BIER的信息中;
将所述BIER的信息在BIER网络中泛洪,使得接收到所述BIER的信息的路由器根据携带的流量工程参数计算流量工程路径。
可选地,
所述流量工程参数信息包括以下一项或者多项:管理组信息、最大链路带宽、最大预留链路带宽、流量工程花费、未保留带宽,其中,所述管理组信息包括以下一项或者多项:子域标识sub-domain ID、比特转发路由器标识BFR-ID、比特转发路由器前缀BFR-Prefix、链路着色、资源等级。
可选地,
根据配置的流量参数值构建流量工程参数,包括:
当通告最大链路带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大链路带宽;
当通告最大预留带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大预留带宽。
可选地,
将所述BIER的信息在BIER网络中泛洪,包括:使用内部网关协议IGP,将BIER info sub-tlv通过链路状态协议数据单元LSP报文或者链路状态通告LSA报文在BIER网络中泛洪。
可选地,
所述方法应用于比特转发路由器BFR。
一种位索引显示复制BIER网络中流量工程信息通告的方法,其中包括:
接收BIER网络中泛洪的BIER的信息;
根据所述BIER的信息携带的流量工程参数计算流量工程路径。
可选地,
所述流量工程路径包括基于流量工程的比特串转发路径。
可选地,
接收BIER网络中泛洪的BIER的信息,包括:接收BIER网络中泛洪的链路状态协议数据单元LSP报文或者链路状态通告LSA报文中的BIER info sub-tlv;
根据所述BIER的信息携带的流量工程参数计算流量工程路径,包括:根据接收到的所述BIERinfo sub-tlv携带的流量工程参数,基于约束条件的最短路径算法计算出流量工程路径。
可选地,
所述方法应用于比特转发路由器BFR。
一种位索引显示复制BIER网络中流量工程信息通告的装置,位于比特转发路由器BFR,其中:包括:
构建模块,设置为:根据配置的流量参数值构建流量工程参数;
插入模块,设置为:将所述流量工程参数填充到BIER的信息中;
泛洪模块,设置为:将所述BIER的信息在BIER网络中泛洪,使得接收到所述BIER的信息的路由器根据携带的流量工程参数计算流量工程路径。
可选地,
所述构建模块根据配置的流量参数值构建流量工程参数,包括:
当通告最大链路带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大链路带宽;
当通告最大预留带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大预留带宽。
可选地,
所述泛洪模块将所述BIER的信息在BIER网络中泛洪,包括:使用内部网关协议IGP,将BIER info sub-tlv通过链路状态协议数据单元LSP报文或者链路状态通告LSA报文在BIER网络中泛洪。
可选地,
所述流量工程参数信息包括以下一项或者多项:管理组信息、最大链路带宽、最大预留链路带宽、流量工程花费、未保留带宽,其中,所述管理组信息包括以下一项或者多项:子域标识sub-domain ID、比特转发路由器标识BFR-ID、比特转发路由器前缀BFR-Prefix、链路着色、资源等级。
一种位索引显示复制BIER网络中流量工程信息通告的装置,其中,包括:
接收模块,设置为:接收BIER网络中泛洪的BIER的信息;
路径模块,设置为:根据所述BIER的信息携带的流量工程参数计算流 量工程路径。
可选地,
所述接收模块接收BIER网络中泛洪的BIER的信息,包括:接收BIER网络中泛洪的链路状态协议数据单元LSP报文或者链路状态通告LSA报文中的BIER info sub-tlv;
所述路径模块根据所述BIER的信息携带的流量工程参数计算流量工程路径,包括:根据接收到的所述BIER info sub-tlv携带的流量工程参数,基于约束条件的最短路径算法计算出流量工程路径。
本发明实施例在BIER网络中通告流量工程信息的方法和装置,扩展了IGP协议携带BIER网络的流量工程参数信息,BFR路由器根据流量工程参数信息计算基于流量工程的比特串(bit string)转发路径,可以实现BIER网络中流量工程的路径的计算功能,该流量工程参数的通告方法也可以用于BIER网络中策略路由、指定路径计算等业务和需求。
本发明实施例的其它特征和优点将在随后的说明书中阐述,并且,部分地从说明书中变得显而易见,或者通过实施本发明实施例而了解。本发明实施例的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
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BIER技术组网图;
图2是BIER技术转发过程图;
图3是本发明实施例的一种BIER网络中流量工程信息通告的方法的流程图;
图4是本发明实施例的另一种BIER网络中流量工程信息通告的方法的流程图;
图5是本发明实施例的一种BIER网络中流量工程信息通告的装置的结构示意图;
图6是本发明实施例的另一种BIER网络中流量工程信息通告的装置的结构示意图;
图7是ISIS BIER info sub tlv结构示意图;
图8是OSPF BIER sub-tlv结构示意图;
图9是本发明实施例的BIER Maximum Link Bandwidth sub sub-tlv的结构示意图;
图10是本发明实施例的ISIS协议流量工程参数通告示意图;
图11是本发明实施例的ISIS流量工程参数通告流程图。
本发明的较佳实施方式
下面结合附图对本发明的实施方式进行描述。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各种方式可以相互组合。
如图3所示,本发明实施例提供一种BIER网络中流量工程信息通告的方法,应用于BFR,包括:
S101、根据配置的流量参数值构建流量工程参数;
S102、将所述流量工程参数填充到位索引显示复制的信息;
本实施例中,BIER的信息可采用Sub-TLV(子类型-长度-值)格式,文中称为BIER info sub-tlv。
S103、将所述BIER info sub-tlv在位索引显示复制BIER网络中泛洪,使得接收到所述BIER info sub-tlv的路由器根据携带的流量工程参数计算流量工程路径。
其中,当所述BIER网络支持的内部网关协议IGP为中间系统到中间系统IS-IS协议或者开放式最短路径优先OSPF协议时,所述BIER info sub-tlv包括以下一项或者多项:管理组信息、最大链路带宽、最大预留链路带宽、流量工程花费、未保留带宽。其中,所述管理组信息包括以下一项或者多项:子域标识sub-domain ID、比特转发路由器标识BFR-ID、比特转发路由器前缀BFR-Prefix、链路着色、资源等级。
当所述BIER网络支持的内部网关协议IGP为中间系统到中间系统IS-IS协议时,扩展IS-IS协议新增sub sub-TLV用于携带BIER的流量工程参数,该sub sub-TLV称为ISIS bier traffic engineering sub sub-TLV,由IS-IS BIER info sub-tlv携带:
可选的,所述ISIS bier traffic engineering sub sub-TLV包括以下的一项或多项:管理组(Administrative Group)信息,最大链路带宽(Maximum link bandwidth),最大预留链路带宽(Maximum Reservable link bandwidth),流量工程花费(traffic engineering metric),未保留带宽(Unreserved bandwidth)。
当所述BIER网络支持的内部网关协议IGP为开放式最短路径优先OSPF协议时,扩展OSPF协议新增OSPF bier traffic engineering sub sub-TLV用于携带BIER的流量工程参数,该sub sub-tlv由OSPF BIER sub-tlv携带:
可选的,所述OSPF bier traffic engineering sub sub-TLV包括以下一项或多项:管理组(Administrative Group)信息,最大链路带宽(Maximum link bandwidth),最大预留链路带宽(Maximum Reservable link bandwidth),流量工程花费(traffic engineering metric),未保留带宽(Unreserved bandwidth)等。
步骤S101包括:
当通告最大链路带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大链路带宽;
当通告最大预留带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大预留带宽。
在步骤S103中,将所述BIER info sub-tlv在BIER网络中泛洪包括:将所述BIER info sub-tlv使用内部网关协议IGP在BIER网络中泛洪,可选的,将所述BIER info sub-tlv通过链路状态协议数据单元LSP报文或者链路状态通告LSA报文在BIER网络中泛洪。
如图4所示,本发明实施例提供一种BIER网络中流量工程信息通告的方法,可应用于BFR,包括:
S201、接收BIER网络中泛洪的位索引显示复制的信息如BIER info  sub-tlv;
BIER info sub-tlv可以携带在链路状态协议数据单元LSP报文或者链路状态通告LSA报文中。
S202、根据所述BIER info sub-tlv携带的流量工程参数计算流量工程路径。
所述流量工程路径可以包括基于流量工程的比特串转发路径。
本实施例中,步骤S202包括:
根据接收到的链路状态协议数据单元LSP报文或者链路状态通告LSA报文中所述BIER info sub-tlv携带的流量工程参数,基于约束条件的最短路径算法计算出流量工程路径。
如图5所示,本发明实施例提供一种BIER网络中流量工程信息通告的装置,可设置在BFR中,包括:
构建模块,设置为:根据配置的流量参数值构建流量工程参数;
插入模块,设置为:将所述流量工程参数填充到位索引显示复制的信息(下文以BIER info sub-tlv为示例)中;
泛洪模块,设置为:将所述BIER info sub-tlv在位索引显示复制BIER网络中泛洪,使得接收到所述BIER info sub-tlv的路由器根据携带的流量工程参数计算流量工程路径。
本实施例中,所述构建模块根据配置的流量参数值构建流量工程参数,包括:
当通告最大链路带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大链路带宽;
当通告最大预留带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大预留带宽。
本实施例中,所述泛洪模块将所述BIER info sub-tlv在BIER网络中泛洪,包括:使用内部网关协议IGP将所述BIER info sub-tlv在BIER网络中泛洪。 可选的,将所述BIER info sub-tlv通过链路状态协议数据单元LSP报文或者链路状态通告LSA报文在BIER网络中泛洪。
本实施例中,所述流量工程参数信息包括以下一项或者多项:管理组信息、最大链路带宽、最大预留链路带宽、流量工程花费、未保留带宽,其中,所述管理组信息包括以下一项或者多项:子域标识sub-domain ID、比特转发路由器标识BFR-ID、比特转发路由器前缀BFR-Prefix、链路着色、资源等级。
如图6所示,本发明实施例还提供一种BIER网络中流量工程信息通告的装置,可设置在BFR中,包括:
接收模块,设置为:接收BIER网络中泛洪的位索引显示复制的信息如BIER info sub-tlv;
路径模块,设置为:根据所述BIER info sub-tlv携带的流量工程参数计算流量工程路径。
本实施例中,所述接收模块接收BIER网络中泛洪的BIER的信息,包括:接收BIER网络中泛洪的链路状态协议数据单元LSP报文或者链路状态通告LSA报文中的BIER info sub-tlv;所述路径模块根据所述BIER info sub-tlv携带的流量工程参数计算流量工程路径包括:根据接收到的所述BIER info sub-tlv携带的流量工程参数,并基于约束条件的最短路径算法计算出流量工程路径。
实施例1
使用ISIS协议通告流量工程信息
BIER协议如果使用ISIS协议作为控制面协议构建BIER的转发基础架构,ISIS协议通过图7所示的ISIS BIER Info sub-tlv通告子域标识(sub-domain ID),BFR标识(BFR-ID),BFR前缀(BFR-Prefix)等必备的信息,BIER info sub-tlv由TLV 235/TLV 237,以及TLV 135/TLV 236携带。ISIS使用这些信息基于最短路径树算法构建BIER的位索引转发信息表。这些参数只能用于构建基础的基于最短路径的转发信息表,当BIER需要支持流量工程时,需要其他的额外的参数信息构建基于约束条件的转发信息表。这些流量工程参 数信息包括管理组(Administrative Group),最大链路带宽(Maximum link bandwidth),最大预留链路带宽(Maximum Reservable link bandwidth),流量工程花费(traffic engineering metric),未保留带宽(Unreserved bandwidth)等。
本实施例提出了这些流量工程参数信息的格式定义,如图9所示为最大链路带宽(Maximum link bandwidth)sub sub-tlv的格式图,图9中:
type字段,设置为:指示该sub sub-tlv的类型,表示本sub sub-tlv为最大链路带宽参数的流量工程参数,8bits;
Length字段表示sub sub-tlv的总长度,16bits;
Maximum Link Bandwidth字段为最大链路带宽的取值,具体取值需要由IANA分配,单位为字节/每秒,32bits。
Maximum link bandwidth sub sub-tlv填充到ISIS BIER info sub-tlv,在路由器泛洪LSP时在网络中通告。
其他的流量工程参数信息,比如管理组,最大预留链路带宽,流量工程花费等参数信息的格式定义跟图9中类似,通过不同的type取值以表示不同的参数信息,这些流量工程参数信息的sub sub-tlv都填充到ISIS BIER info sub-tlv中。
实施例2
使用OSPF协议通告流量工程信息
BIER协议如果使用OSPF协议作为控制面协议构建BIER的转发基础架构,现有的OSPF协议通过图8所示的OSPF BIER sub-tlv通告sub-domain ID,BFR-ID,BFR-Prefix等必备的信息,BIER sub-tlv由Extended Prefix TLV携带。OSPF使用这些信息基于最短路径树算法构建BIER的位索引转发信息表。这些参数只能用于构建基础的基于最短路径的转发信息表,当BIER需要支持流量工程时,需要其他的额外的参数信息构建基于约束条件的转发信息表。这些流量工程参数信息包括管理组(Administrative Group),最大链路带宽(Maximum link bandwidth),最大预留链路带宽(Maximum Reservable link bandwidth),流量工程花费(traffic engineering metric),未保留带宽(Unreserved  bandwidth)等。
基于OSPF协议携带的流量工程参数信息的格式定义跟实施例1中定义的格式类似,如定义的Maximum Link Bandwidth sub sub-tlv的格式图的也如图9所示,字段的描述和功能也都一样,在此不再做详细的阐述。
实施例3
本实施例详细阐述流量工程参数在IGP网络的通告流程,如图10和11所示。
(301)BFR1根据配置的流量参数值构建流量工程参数sub sub-tlv,如需要通告最大链路带宽参数时,按照图9所示格式构建BIER Maximum Link Bandwidth sub sub-tlv,如果需要通告最大预留带宽时,构建BIER Maximum Reservable link bandwidth sub sub-tlv,其他的参数信息的sub sub-tlv构建类似,BFR1将构造好的流量工程参数信息sub sub-tlv填充到BIER info sub-tlv中。BFR1将填充好的BIER info sub-tlv通过LSP在BIER网络中泛洪;
(302)BIER网络中的BFR2路由器收到了BFR1通告的LSP报文,并根据LSP中携带的参数信息,构建基于约束的最短路径算法(CSPF)计算流量工程路径。
对于使用OSPF协议通告流量工程参数的流程,跟ISIS协议通告流程比较类似,再次不再做阐述。
本领域普通技术人员可以理解上述实施例的全部或部分步骤可以使用计算机程序流程来实现,所述计算机程序可以存储于一计算机可读存储介质中,所述计算机程序在相应的硬件平台上(如系统、设备、装置、器件等)执行,在执行时,包括方法实施例的步骤之一或其组合。
可选地,上述实施例的全部或部分步骤也可以使用集成电路来实现,这些步骤可以被分别制作成一个个集成电路模块,或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。
上述实施例中的装置/功能模块/功能单元可以采用通用的计算装置来实 现,它们可以集中在单个的计算装置上,也可以分布在多个计算装置所组成的网络上。
上述实施例中的装置/功能模块/功能单元以软件功能模块的形式实现并作为独立的产品销售或使用时,可以存储在一个计算机可读取存储介质中。上述提到的计算机可读取存储介质可以是只读存储器,磁盘或光盘等。
工业实用性
通过本发明实施例的方案,扩展IGP协议携带BIER网络的流量工程参数信息,BFR路由器根据流量工程参数信息计算基于流量工程的比特串(bit string)转发路径,可以实现BIER网络中流量工程的路径的计算功能,该流量工程参数的通告方法也可以用于BIER网络中策略路由、指定路径计算等业务和需求。

Claims (15)

  1. 一种位索引显示复制BIER网络中流量工程信息通告的方法,包括:
    根据配置的流量参数值构建流量工程参数;
    将所述流量工程参数填充到BIER的信息中;
    将所述BIER的信息在BIER网络中泛洪,使得接收到所述BIER的信息的路由器根据携带的流量工程参数计算流量工程路径。
  2. 如权利要求1所述的方法,其中:所述流量工程参数信息包括以下一项或者多项:管理组信息、最大链路带宽、最大预留链路带宽、流量工程花费、未保留带宽,其中,所述管理组信息包括以下一项或者多项:子域标识sub-domain ID、比特转发路由器标识BFR-ID、比特转发路由器前缀BFR-Prefix、链路着色、资源等级。
  3. 如权利要求2所述的方法,其中:根据配置的流量参数值构建流量工程参数,包括:
    当通告最大链路带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大链路带宽;
    当通告最大预留带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大预留带宽。
  4. 如权利要求1所述的方法,其中:将所述BIER的信息在BIER网络中泛洪,包括:
    使用内部网关协议IGP,将BIER info sub-tlv通过链路状态协议数据单元LSP报文或者链路状态通告LSA报文在BIER网络中泛洪。
  5. 如权利要求1所述的方法,其中:
    所述方法应用于比特转发路由器BFR,所述BIER的信息为BIER info sub-tlv。
  6. 一种位索引显示复制BIER网络中流量工程信息通告的方法,其中包括:
    接收BIER网络中泛洪的BIER的信息;
    根据所述BIER的信息携带的流量工程参数计算流量工程路径。
  7. 如权利要求6所述的方法,其中:所述流量工程路径包括基于流量工程的比特串转发路径。
  8. 如权利要求6所述的方法,其中:
    接收BIER网络中泛洪的BIER的信息,包括:接收BIER网络中泛洪的链路状态协议数据单元LSP报文或者链路状态通告LSA报文中的BIER info sub-tlv;
    根据所述BIER的信息携带的流量工程参数计算流量工程路径,包括:根据接收到的所述BIERinfo sub-tlv携带的流量工程参数,基于约束条件的最短路径算法计算出流量工程路径。
  9. 如权利要求6所述的方法,其中:
    所述方法应用于比特转发路由器BFR,所述BIER的信息为BIER info sub-tlv。
  10. 一种位索引显示复制BIER网络中流量工程信息通告的装置,位于比特转发路由器BFR,其中:包括:
    构建模块,设置为:根据配置的流量参数值构建流量工程参数;
    插入模块,设置为:将所述流量工程参数填充到BIER的信息中;
    泛洪模块,设置为:将所述BIER的信息在BIER网络中泛洪,使得接收到所述BIER的信息的路由器根据携带的流量工程参数计算流量工程路径。
  11. 如权利要求10所述的装置,其中:所述构建模块根据配置的流量参数值构建流量工程参数,包括:
    当通告最大链路带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大链路带宽;
    当通告最大预留带宽时,构建的流量工程参数的格式包括参数类型、字节长度和最大预留带宽。
  12. 如权利要求10所述的装置,其中:所述泛洪模块将所述BIER的信息在BIER网络中泛洪,包括:
    使用内部网关协议IGP,将BIER info sub-tlv通过链路状态协议数据单元LSP报文或者链路状态通告LSA报文在BIER网络中泛洪。
  13. 如权利要求10所述的装置,其中:所述流量工程参数信息包括以下一项或者多项:管理组信息、最大链路带宽、最大预留链路带宽、流量工程花费、未保留带宽,其中,所述管理组信息包括以下一项或者多项:子域标识sub-domain ID、比特转发路由器标识BFR-ID、比特转发路由器前缀BFR-Prefix、链路着色、资源等级。
  14. 一种位索引显示复制BIER网络中流量工程信息通告的装置,其中,包括:
    接收模块,设置为:接收BIER网络中泛洪的BIER的信息;
    路径模块,设置为:根据所述BIER的信息携带的流量工程参数计算流量工程路径。
  15. 如权利要求14所述的装置,其中:
    所述接收模块接收BIER网络中泛洪的BIER的信息,包括:接收BIER网络中泛洪的链路状态协议数据单元LSP报文或者链路状态通告LSA报文中的BIER info sub-tlv;
    所述路径模块根据所述BIER的信息携带的流量工程参数计算流量工程路径,包括:根据接收到的所述BIER info sub-tlv携带的流量工程参数,基于约束条件的最短路径算法计算出流量工程路径。
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