WO2012075846A1 - 域划分时报文的广播方法及装置 - Google Patents

域划分时报文的广播方法及装置 Download PDF

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Publication number
WO2012075846A1
WO2012075846A1 PCT/CN2011/079837 CN2011079837W WO2012075846A1 WO 2012075846 A1 WO2012075846 A1 WO 2012075846A1 CN 2011079837 W CN2011079837 W CN 2011079837W WO 2012075846 A1 WO2012075846 A1 WO 2012075846A1
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Prior art keywords
entry information
forwarding entry
identifier
switching device
path
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PCT/CN2011/079837
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English (en)
French (fr)
Inventor
李小利
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP11847237.2A priority Critical patent/EP2651074A4/en
Priority to BR112013016555A priority patent/BR112013016555A2/pt
Publication of WO2012075846A1 publication Critical patent/WO2012075846A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations
    • H04L12/18Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1886Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with traffic restrictions for efficiency improvement, e.g. involving subnets or subdomains
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations
    • H04L12/18Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/1863Arrangements for providing special services to substations for broadcast or conference, e.g. multicast comprising mechanisms for improved reliability, e.g. status reports
    • H04L12/1877Measures taken prior to transmission

Definitions

  • TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and apparatus for broadcasting a message when a domain is divided.
  • VPLS Virtual Area Network (Local Area Network) service
  • L2VPN Layer 2 Virtual Private Network
  • MPLS Multi Protocol Label Switching
  • VPN Virtual Private Network
  • VPLS provides accessibility through MAC (Media Access Control) address learning: 1) Remote MAC address learning associated with PW (Pseudo Wire, virtual connection between two virtual exchange instances), through PW Go to the remote MAC address.
  • the PW is composed of a pair of unidirectional VC LSPs (Virtual Circuit Label Switch Paths). After learning the original unknown MAC address on the VC LSP in the inbound direction, the PW needs to use the MAC address with the MAC address.
  • the VC LSPs in the outbound direction form a mapping relationship. 2) Learn the local MAC address of the directly connected port of the user and learn the MAC address of the direct access through the AC (Attachment Circuit).
  • VPLS For the packets transmitted on the CE (Customer Edge), you need to learn the source MAC address of the packet to the corresponding port of the VSI (Virtual Switch Instance).
  • PE Provide Edge
  • the conditional restrictions for the VPLS MAC address learning are as follows: 1) For a packet whose destination MAC address is a non-broadcast address, if the PE has not learned the MAC address, the PE will broadcast the packet. 2) If the PE receives the broadcast packet from the local user, it will forward the broadcast packet to all other ports on the same VPLS and all other PEs in the same VPLS.
  • the Spoke-PE1 When the Spoke-PE1 does not learn the MAC address of the Spoke-PE2, the Spoke-PE1 sends a broadcast packet to the Hub through the pseudowire of the Hub-PE to the Spoke-PE1.
  • - PE core layer PE device
  • the broadcast traffic is sent to other ports except the local port in this example. If no other ports are found, the traffic is discarded. In this case, the Hub-PE is sent to the Spoke-PE2.
  • the pseudowire is the same as the pseudowire port in the inbound direction of the broadcast packet. Therefore, traffic is no longer forwarded from this port.
  • the network similar to that of Figures 1 and 2 also has Figure 3.
  • the AC (Attachment Circuit, the link between the CE and the PE) also has the same problem of discarding broadcast traffic.
  • PC_2 that has arrived through CE1 and PC_1 belongs to different VLAN access (with different VLAN TAG (tag) attributes) cannot be broadcast from the same port.
  • VLAN TAG (tag) attributes different VLAN TAG (tag) attributes
  • the present invention provides a broadcast scheme for a message when a domain is divided, which is a problem of packet blocking caused by domain division in the related art.
  • a method for broadcasting a message in a domain division manner including: a switching device sets an identifier for a path in a domain; and after receiving a packet from a path, the switching device uses a different identifier from the path. Path broadcast message.
  • the switching device sets the identifier for the path in the domain, including: the switching device generates the VPLS forwarding entry information of the virtual private local area network service corresponding to the path in the domain, and obtains the identifier corresponding to the VPLS forwarding entry information; the switching device determines that there is no VPLS forwarding in the forwarding table. Entry information; The switching device writes the VPLS forwarding entry information and identity to the forwarding table. Preferably, the switching device generates the VPLS forwarding entry information, and obtains the identifier corresponding to the VPLS forwarding entry information. The master processing unit of the switching device generates the VPLS forwarding entry information and obtains the identifier corresponding to the VPLS forwarding entry information.
  • the switching device generates the VPLS forwarding entry information
  • the identifier corresponding to the VPLS forwarding entry information includes: the main control processing unit of the switching device generates the VPLS forwarding entry information; and the main control processing unit sends the VPLS forwarding entry information to the line of the switching device. Card;
  • the line card obtains the identifier corresponding to the VPLS forwarding entry information.
  • the identifier corresponding to the VPLS forwarding entry information is: the virtual forwarding instance of the switching device identifies that the VFI ID management module determines whether the VPLS forwarding entry information has a corresponding identifier; if yes, the VFI ID management module sends the corresponding identifier to the exchange.
  • the main control processing unit or line card of the device if not, the VFI ID management module assigns a corresponding identifier to the VPLS forwarding entry information, and sends the corresponding identifier to the main control processing unit or line card of the switching device.
  • the switching device broadcasts the packet by using a path with a different identifier from the path.
  • the switching device searches for a path with a different identifier in a forwarding table in the forwarding table after receiving the packet.
  • the device broadcasts messages using paths with different identities.
  • a broadcast apparatus for a message during domain division comprising: a setting module configured to set an identifier for a path in a domain; a receiving module configured to receive a message from a path; a broadcast module, setting Broadcast a message to use a path with a different identity to this path.
  • the setting module includes: a generating submodule, configured to generate virtual private local area network service VPLS forwarding entry information corresponding to the path in the domain; and acquiring a submodule, configured to obtain an identifier corresponding to the VPLS forwarding entry information; Determining that there is no VPLS forwarding entry information in the forwarding table; the recording submodule is configured to write the VPLS forwarding entry information and the identifier into the forwarding table.
  • the generating submodule and the obtaining submodule are located in a main control processing unit of the switching device.
  • the obtaining submodule is located in the main control processing unit of the switching device, the obtaining submodule is located in the line card of the switching device, and the obtaining submodule is set to generate VPLS forwarding entry information; the main control processing unit is configured to send the VPLS forwarding entry information
  • the line card is set; the line card is set to obtain the identifier corresponding to the VPLS forwarding entry information.
  • the identifier is set in the path of the domain, and when the packet is received, the packet is broadcasted by using a path different from the path of the received packet, and the packet blocking caused by the domain division in the related art is solved. The problem, in turn, achieves the effect of normal broadcast messages.
  • FIG. 1 is a schematic diagram of an example of a PW networking according to the related art
  • FIG. 2 is a schematic diagram of another PW networking according to the related art
  • 3 is a schematic diagram of an AC networking according to the related art
  • FIG. 4 is a flowchart of a method for broadcasting a message when domain division according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for VFI ID allocation and synchronization according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a process of processing an AC-side broadcast packet according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a PW-side broadcast packet processing flow according to an embodiment of the present invention
  • FIG. 8 is a domain division time report according to an embodiment of the present invention
  • FIG. 9 is a structural block diagram of a setting module according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of a method for broadcasting a packet during domain division according to an embodiment of the present invention.
  • the method includes step S402. Go to step S404.
  • Step S402 The switching device sets an identifier for the path in the domain, where the identifier may be an identifier of an existing pseudowire or the like, or may be a newly set virtual forwarding instance identifier.
  • Step S404 After receiving the packet from a path, the switching device broadcasts the packet by using a path with a different identifier from the path. In this embodiment, an identifier is set for the path in the domain.
  • the switching device broadcasts the packet by using a path different from the path of the received packet, so that the inbound and outgoing attributes are the same. Can be broadcast.
  • the switching device can be a switch.
  • the setting of the identifier for the path in the domain may include: the switching device generates the VPLS forwarding entry information corresponding to the path in the domain, and obtains the identifier corresponding to the VPLS forwarding entry information; The device determines whether the VPLS forwarding entry information exists in the forwarding table. If not, the switching device writes the VPLS forwarding entry information and its corresponding identifier into the forwarding table.
  • the switching device generates the VPLS forwarding entry information, and obtains the identifier corresponding to the VPLS forwarding entry information, which may be implemented by: the master processing unit of the switching device generates the VPLS forwarding entry information and Obtaining an identifier corresponding to the VPLS forwarding entry information; or the main control processing unit of the switching device generates the VPLS forwarding entry information; then, sending the VPLS forwarding entry information to the line card of the switching device; and obtaining, by the line card, the VPLS forwarding entry information Logo.
  • the obtaining the identifier corresponding to the VPLS forwarding entry information may include: the virtual forwarding instance identifier of the switching device, the VFI ID management module determining whether the VPLS forwarding entry information has a corresponding identifier; if yes, The VFI ID management module sends the corresponding identifier to the master processing unit or line card of the switching device. If not, the VFI ID management module allocates a corresponding identifier for the VPLS forwarding entry information, and sends the corresponding identifier to the master of the switching device. Control the processing unit or line card.
  • the step S404 may include: after receiving the packet, the switching device searches for a path in the forwarding table that has a different identifier from a path; the broadcast device broadcasts the packet by using a path with a different identifier.
  • the second embodiment of the present invention provides a packet blocking decision management method, which is used to prevent normal broadcast traffic from being discarded by the current device when the same broadcast attribute and the egress attribute are provided, thereby blocking normal broadcast packets. Forward. This example sets the instance sequence identifier of the VPLS service instance on the AC side and the PW side to identify different access lines on the AC side and different pseudo lines on the PW side, and write the hardware forwarding table synchronously.
  • the data source and the data destination type AC or PW
  • the instance sequence identifier corresponding to the data source entry and the sequence identifier in the egress direction are discarded. Otherwise, the packet is forwarded according to normal traffic.
  • the instance sequence identifier is allocated based on the package information of the packet forwarding, and corresponds to the packet export encapsulation information. Different packet export encapsulation information is bound to different instance sequence identifiers.
  • the traffic discarding or forwarding is determined by comparing the sequence identifier of the ingress instance with the sequence identifier of the egress direction, which solves the problem that the VPLS and the different accesses of the port cannot communicate with each other.
  • the switch in this embodiment includes a plurality of main control processing units and line card boards.
  • the VPLS instance sequence identifier is simply referred to as the VFI ID (Virtual Switch Instance Identifier).
  • the implementation process of the embodiment is described by taking the implementation method of the distributed switch as an example. The implementation process includes the following steps: Step 1: The new VPLS forwarding entry information is generated on the master control, and the VFI ID allocation interface provided by the VFI ID management module is invoked.
  • Step 2 The VFI ID management module determines whether the VFI ID needs to be allocated. If there is no VFI ID corresponding to the forwarding entry, the VFI ID is assigned, otherwise no processing is performed. The VFI ID module establishes a forwarding entry associated with the VFI ID to ensure that different forwarding entries correspond to different VFI IDs.
  • Step 3 The master sends the forwarding entry synchronization information and the VFI ID to the line card driver. In step 4, the line card driver accepts the forwarding entry information and the VFI ID. Then judge whether the write driver is needed (write the information to the hardware forwarding table), and if so, complete the write drive process, otherwise go to step 5.
  • Step 5 The forwarding information and the VFI ID are synchronized, and the forwarding entry synchronization process is exited.
  • the release interface is called to reclaim the VFI ID.
  • the BP and VFI ID collections are consistent with the deletion of the forwarding entries.
  • the information about the forwarding entry generated by the master in the first step is as follows: The local instance generated by the VPLS instance and the protocol (for example, the LDP (Label Distribution Protocol)) is associated with the remote PW instance. The forwarding path.
  • the VFI ID module needs to maintain the VFI ID table in Step 2.
  • the VFI ID table is searched according to the forwarding entry keyword passed by the platform to determine whether the corresponding VFI ID value has been assigned to the entry.
  • the VFI will be found.
  • the ID is returned to the platform.
  • the platform does not send the VFI ID to the line card.
  • the line card After receiving the forwarding entry information, the line card checks the VFI ID table according to the keyword to obtain the VFI ID.
  • the step 4 card VFI ID module can select whether to maintain the VFI ID table as needed.
  • the line card driver in step 5 determines whether a write driver is required, and the write driver is determined to be synchronized according to the new forwarding entry on the master control and the forwarding entry triggered by the forwarding entry information update. In other cases, the write driver is not required.
  • the line card of the centralized switch and the main control are combined, and the same function is completed by the same control unit.
  • a method for performing traffic congestion decision management based on a global service instance sequence identifier is added on the basis of the existing domain segmentation processing broadcast packet mechanism, and the same characteristics of the entry attribute and the exit attribute are prevented. Normal broadcast traffic is dropped.
  • the present embodiment performs the traffic discarding or forwarding decision of the broadcast packet by synchronizing the instance serial number comparison and the more complete packet traffic blocking decision mechanism.
  • the problem of abnormally blocking broadcast packets caused by domain partitioning is solved on the basis of not changing the original domain partitioning mechanism to prevent the occurrence of broadcast storms, the hardware requirements are reduced, and the scalability of the VPLS network is improved.
  • FIG. 5 is a flowchart of a method for VFI ID allocation and synchronization according to an embodiment of the present invention. As shown in FIG. 5, the flow includes steps S502 to S516. Step S502: A new forwarding entry is generated on the master due to the configuration or the protocol. The master calls the VFI ID allocation release interface provided by the master VFI ID module. In step S504, the VFI ID module determines whether the VFI ID already exists. If yes, the process proceeds to step S506, and if no, the process proceeds to step S508.
  • Step S506 The VFI ID module searches the VFI ID table according to the forwarding entry information (the egress encapsulation attribute information corresponding to the forwarding path where the AC and the PW are located), and obtains the VFI ID that has been allocated by the forwarding entry.
  • Step S508 the VFI ID module allocates a VFI ID for the forwarding entry, adds an allocated record, and establishes a correspondence table between the forwarding entry encapsulation information and the VFI ID.
  • the master sends the forwarding entry synchronization information and the VFI ID to the line card.
  • Steps S512 to S514 after the line card accepts the information sent by the master control, it is determined whether the forwarding entry information is successfully written, if yes, then the process goes to step S516, the driver is not written, and the write drive is successfully returned; if not, if it is a new entry If it is added, the forwarding information and the VFI ID information are written into the VPLS forwarding table. If the old entry information changes, the VPLS forwarding table is updated. In step S516, the return is successful. Note that the switch that supports the active/standby switchover function (not only the main control board but also the standby board) also needs to maintain the mapping table between the forwarding entry encapsulation information and the VFI ID.
  • the forwarding entry identifies a certain situation (for example, if there is a PW pseudowire service with different PW IDs, such as a total of 16K and a fixed size), a fixed allocation mode may be selected (for example, selecting a 16K number as an instance identifier) A fixed mapping relationship is established with the PW ID.
  • the instance sequence identifier resource is not recycled.
  • FIG. 6 is a schematic diagram of a process of processing an AC-side broadcast message according to an embodiment of the present invention.
  • the process includes steps S602 to S616.
  • Step S602 the message enters the entry line card through the ingress port.
  • Step S604 the ingress chip performs packet parsing, and obtains in port AC attribute information (including VLAN TAG attribute information).
  • Step S606 Find a forwarding table, and obtain the port AC forwarding information and the VFI ID corresponding to the ingress port AC.
  • the searched information is sent to the switching processing unit (it may be determined whether the switching processing unit is on the master or the line card according to different implementation mechanisms of the switch).
  • step S608 the switching processing unit exchanges the VFI ID information and the outbound port forwarding attribute information corresponding to the port AC to the online card of the outbound port chip according to the outbound port AC forwarding information.
  • Step S610 The outbound port chip obtains the VFI ID and the package information corresponding to the port AC according to the outbound port forwarding information lookup forwarding table.
  • Step S612 the message blocking decision management module compares whether the VFI ID information corresponding to the ingress port AC and the VFI ID corresponding to the egress port are the same. If yes, proceed to step S614; otherwise, proceed to step S616. Step S614, discarding the traffic.
  • Step S616 completing packet encapsulation according to the encapsulation information, and finally completing packet forwarding.
  • FIG. 7 is a schematic diagram of a process of processing a PW side broadcast message according to an embodiment of the present invention.
  • the process includes steps S702 to S716.
  • Step S702 the message enters the entry line card through the ingress port.
  • Step S704 the ingress chip performs packet parsing, and acquires inbound port PW attribute information.
  • step S706 the forwarding table is searched, and the port PW forwarding attribute information and the VFI ID corresponding to the ingress port PW are obtained. And the obtained information is sent to the exchange processing unit (it may be determined whether the exchange processing unit is on the main control or the line card according to the implementation mechanism of the switch).
  • step S708 the switching processing unit exchanges the VFI ID information and the outbound port forwarding attribute information corresponding to the inbound port PW to the online card of the outbound port chip according to the outbound port PW forwarding attribute information.
  • Step S710 The outbound port chip searches the forwarding table according to the outbound port forwarding attribute information to obtain the VFI ID and the package information corresponding to the port PW.
  • Step S712 the message blocking decision management module compares whether the VFI ID information corresponding to the ingress port PW and the VFI ID information corresponding to the egress port are the same. If yes, go to step S714; otherwise, go to step S716. Step S714, discarding the traffic.
  • Step S716 the packet encapsulation is completed according to the encapsulation information, and finally, the PW side packet forwarding is completed.
  • the packet blocking decision management method in this embodiment can be applied to the L2VPN service and other distributed and centralized switches blocked by the domain segmentation, and the packet forwarding information is matched with the service instance sequence identifier, and combined.
  • the original packet broadcast decision mechanism can implement the packet broadcast described in this embodiment by comparing the inbound port instance sequence identifier with the outbound port instance sequence identifier to determine whether the packet is forwarded or discarded. On the basis of the embodiment, a corresponding transformation may be performed.
  • a globally unique instance identifier may be selected for the multi-line card, or a local unique identifier for the single-line card may be selected; the identifier may be customized, or the service attribute association may be taken.
  • the attribute identifier (such as PW ID, PW in label, etc.) is used as the instance identifier.
  • the completion of the traffic blocking decision can be at the ingress chip or at the egress chip.
  • Embodiment 4 This embodiment provides a broadcast apparatus for a message when the domain is divided, and the apparatus is used to implement the method described in the foregoing embodiment.
  • the device may be a switching device such as a switch.
  • FIG. 8 is a structural block diagram of a broadcast apparatus for a message when a domain is divided according to an embodiment of the present invention.
  • the apparatus includes: a setting module 82 configured to set an identifier for a path in a domain; and a receiving module 84 coupled to the setting The module 82 is configured to receive a message from a path; the broadcast module 86, coupled to the receiving module 84, is configured to use a path broadcast message having a different identity than the path.
  • FIG. 9 is a structural block diagram of a setting module according to an embodiment of the present invention. As shown in FIG.
  • the setting module 82 includes: a generating submodule 92, configured to generate a virtual private local area network service VPLS forwarding entry letter corresponding to a path in the domain.
  • the obtaining sub-module 94 is coupled to the generating sub-module 92, and configured to obtain an identifier corresponding to the VPLS forwarding entry information;
  • the determining sub-module 96 is coupled to the obtaining sub-module 94, and configured to determine that there is no VPLS forwarding entry information in the forwarding table;
  • the sub-module 98, coupled to the determining sub-module 96, is configured to write the VPLS forwarding entry information and identification to the forwarding table.
  • the generating sub-module 92 and the obtaining sub-module 94 are located in a master processing unit of the switching device.
  • the obtaining sub-module 94 is located in the main control processing unit of the switching device, the obtaining sub-module 94 is located in the line card of the switching device, and the obtaining sub-module 94 is configured to generate VPLS forwarding entry information.
  • the main control processing unit is configured to send the VPLS forwarding entry information to the line card; the line card is configured to obtain an identifier corresponding to the VPLS forwarding entry information.
  • the embodiment of the present invention implements a message blocking decision mechanism based on a service instance sequence, which eliminates the contradiction between the complex networking and the domain division scheme for preventing broadcast storms, and reduces the complexity of the message blocking decision mechanism.
  • the hardware cost is reduced.
  • the unified processing of board forwarding and cross-board forwarding improves the flexibility of chip forwarding.
  • the computing device may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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Description

域划分时报文的广播方法及装置 技术领域 本发明涉及通信领域, 具体而言, 涉及一种域划分时报文的广播方法及装置。 背景技术 随着城域网分组化改造的推进, 电信级以太网业务的不同实现技术在不断发展完 善, VPLS (虚拟专用 LAN (Local Area Network, 局域网)业务)技术也不例外。 VPLS 提供点到多点的 L2VPN (Layer 2 Virtual Private Network, 二层虚拟专用网)业务, 它 结合了以太网和 MPLS ( Multi protocol label Switching,多协议标志交换) VPN ( Virtual Private Network, 虚拟专用网) 的优点, 使得通过 MAN ( Metropolitan Area Network, 城域网)或 WAN (Wide Area Network, 广域网)连接的站点间的交互像是在一个 LAN 中通信。
VPLS通过 MAC (Media Access Control, 媒体接入控制)地址学习来提供可达性: 1 ) 与 PW (Pseudo Wire, 两个虚拟交换实例之间的虚拟连接) 关联的远程 MAC地址 学习,通过 PW学到远端 MAC地址。 PW是由一对单向的 VC LSP( Virtual Circuit Label Switch Path, 虚电路标签交换路径) 组成, 当在入方向的 VC LSP上学习到一个原来 未知的 MAC地址后, 需要 PW将此 MAC地址与出方向的 VC LSP形成映射关系。 2) 与用户直连端口的本地 MAC地址学习, 通过 AC (Attachment Circuit, 接入电路) 学 到直接接入的 MAC地址。 对于 CE (Customer Edge, 用户边缘设备) 上传送的报文, 需要将报文的源 MAC地址学习到 VSI (Virtual Switch Instance, 虚拟交换实例) 的对 应端口上。 在 VPLS中, 由 PE (Provider Edge, 服务商边缘设备) 进行 MAC地址学习。 与 此同时, VPLS MAC地址学习满足的条件限制包括: 1 )对于目的 MAC地址为非广播 地址的报文, 如果 PE还没有学习到该 MAC地址, 则 PE将广播该报文。 2) 如果 PE 收到本地用户发出的广播报文, 它将向同一 VPLS的所有其它端口以及同一 VPLS的 所有其他 PE转发广播报文。 由于采用 "广播"工作模式, 当网络规模较大时, 信息在传输过程中容易出现碰 撞、 堵塞, MAC学习限制的条件 2)对广播范围 (即广播域) 的限制有效地减少了广 播风暴对网络的影响。 但是, 与此同时, 这种域划分给实际组网应用也带来了一定的 缺陷, 例如, 如图 1和图 2所示, 在 PW侧, 针对 Hub-Spoke (轴辐式拓扑) 组网, Spoke-PEl (接入层 PE设备) 禾 P Spoke-PE2属于同一个 VSI, Spoke-PEl 没有学到 Spoke-PE2的 MAC时,通过 Hub-PE到 Spoke-PEl的伪线发送广播报文给 Hub-PE (核 心层 PE设备), Hub-PE完成复制后, 广播流量给本实例中除本端口以外的其他端口 (没有发现其他端口则丢弃), 此时, 由于 Hub-PE到 Spoke-PE2的伪线与广播报文入 方向的伪线端口相同, 因此, 流量不再从此端口进行转发。 与图 1和图 2类似的组网 还有图 3。 AC (Attachment Circuit, 接入链路, 即 CE与 PE之间的链路)侧也同样存 在此类似错误丢弃广播流量的问题。 如图 3所示, PC1 的广播流量到 PE后, 无法从 同一个端口再广播经 CE1到达和 PC_1属于不同 VLAN接入 (带不同的 VLAN TAG (标签) 属性) 的 PC_2。 目前, 在 VPLS中解决域划分带来的报文阻塞问题的方法包括: 改变外部网络拓 扑, 组网规避, 其缺陷是应用条件有限、 扩展性不好。 另外, 还可以引入更加高效、 智能的 MAC学习机制来解决, 例如, 基于源 AC和目的 AC—致性比较、源 PW和目 的 PW—致性比较来决策是否进行阻塞流量, 但是, 这些方式对硬件的要求比较高, 管理复杂度高。 发明内容 针对上述的相关技术中域划分时带来的报文阻塞的问题, 本发明提供了一种域划 分时报文的广播方案。 根据本发明的一个方面, 提供了一种域划分时报文的广播方法, 包括: 交换设备 为域内的路径设置标识; 交换设备从一条路径接收到报文后, 使用与这一条路径具有 不同标识的路径广播报文。 优选地, 交换设备为域内的路径设置标识包括: 交换设备生成域内的路径对应的 虚拟专用局域网业务的 VPLS转发条目信息,并获取 VPLS转发条目信息对应的标识; 交换设备确定转发表内没有 VPLS转发条目信息; 交换设备将 VPLS转发条目信息和 标识写入转发表。 优选地, 交换设备生成 VPLS转发条目信息, 并获取 VPLS转发条目信息对应的 标识包括: 交换设备的主控处理单元生成 VPLS转发条目信息并获取 VPLS转发条目 信息对应的标识。 优选地, 交换设备生成 VPLS转发条目信息, 并获取 VPLS转发条目信息对应的 标识包括:交换设备的主控处理单元生成 VPLS转发条目信息;主控处理单元将 VPLS 转发条目信息发送给交换设备的线卡; 线卡获取 VPLS转发条目信息对应的标识。 优选地, 获取 VPLS转发条目信息对应的标识包括: 交换设备的虚拟转发实例标 识 VFI ID管理模块判断 VPLS转发条目信息是否有对应的标识; 如果是, 则 VFI ID 管理模块将对应的标识发送给交换设备的主控处理单元或线卡; 如果否, 则 VFI ID管 理模块为 VPLS转发条目信息分配对应的标识, 并将对应的标识发送给交换设备的主 控处理单元或线卡。 优选地, 交换设备从一条路径接收到报文后, 使用与一条路径具有不同标识的路 径广播报文包括: 交换设备接收到报文后, 查找转发表中与一条路径具有不同标识的 路径; 广播设备使用具有不同标识的路径广播报文。 根据本发明的另一方面, 提供了一种域划分时报文的广播装置, 包括: 设置模块, 设置为为域内的路径设置标识; 接收模块, 设置为从一条路径接收报文; 广播模块, 设置为使用与这一条路径具有不同标识的路径广播报文。 优选地, 上述设置模块包括: 生成子模块, 设置为生成域内的路径对应的虚拟专 用局域网业务 VPLS转发条目信息; 获取子模块, 设置为获取 VPLS转发条目信息对 应的标识; 确定子模块, 设置为确定转发表内没有 VPLS转发条目信息; 记录子模块, 设置为将 VPLS转发条目信息和标识写入转发表。 优选地, 生成子模块和获取子模块位于交换设备的主控处理单元中。 优选地, 获取子模块位于交换设备的主控处理单元中, 获取子模块位于交换设备 的线卡中,获取子模块设置为生成 VPLS转发条目信息;主控处理单元设置为将 VPLS 转发条目信息发送给线卡; 线卡设置为获取 VPLS转发条目信息对应的标识。 通过本发明, 采用对域内的路径设置标识, 当接收到报文时, 使用与接收报文的 路径不同的路径进行广播该报文,解决了相关技术中域划分时带来的报文阻塞的问题, 进而达到了正常广播报文的效果。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部分, 本发 明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的不当限定。 在附图 中: 图 1是根据相关技术的一种 PW组网举例示意图; 图 2是根据相关技术的另一种 PW组网举例示意图; 图 3是根据相关技术的 AC组网举例示意图; 图 4是根据本发明实施例的域划分时报文的广播方法的流程图; 图 5是根据本发明实施例的 VFI ID分配和同步的方法流程图; 图 6是根据本发明实施例的 AC侧广播报文处理流程示意图; 图 7是根据本发明实施例的 PW侧广播报文处理流程示意图; 图 8是根据本发明实施例的域划分时报文的广播装置的结构框图; 图 9是根据本发明实施例的设置模块的结构框图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 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组合。 实施例一 本发明实施例提供了一种域划分时报文的广播方法, 图 4是根据本发明实施例的 域划分时报文的广播方法的流程图, 如图 4所示, 该方法包括步骤 S402至步骤 S404。 步骤 S402, 交换设备为域内的路径设置标识; 其中, 该标识可以为现有的伪线等 的标识, 也可以为新设置的虚拟转发实例标识。 步骤 S404, 交换设备从一条路径接收到报文后, 使用与这一条路径具有不同标识 的路径广播报文。 本实施例中, 对域内的路径设置了标识, 当接收到报文时, 交换设备使用与接收 报文的路径不同的路径进行广播该报文, 从而使得入口属性和出口属性相同的广播报 文能够被广播。 其中, 交换设备可以是交换机。 在本发明实施例的一个优选实现方式中, 交换设备为域内的路径设置标识可以包 括: 交换设备生成域内的路径对应的 VPLS转发条目信息, 并获取该 VPLS转发条目 信息对应的标识; 然后, 交换设备判断转发表内是否存在该 VPLS转发条目信息, 如 果不存在, 则交换设备将该 VPLS转发条目信息和其对应的标识写入转发表中。 在本发明实施例的另一个优选实现方式中, 交换设备生成 VPLS转发条目信息, 并获取 VPLS转发条目信息对应的标识可以通过以下方式实现: 交换设备的主控处理单元生成该 VPLS转发条目信息并获取 VPLS转发条目信息 对应的标识; 或者 交换设备的主控处理单元生成 VPLS转发条目信息; 然后, 将该 VPLS转发条目 信息发送给交换设备的线卡; 再由线卡获取 VPLS转发条目信息对应的标识。 在本发明实施例的又一个优选实现方式中, 获取 VPLS转发条目信息对应的标识 可以包括:交换设备的虚拟转发实例标识 VFI ID管理模块判断 VPLS转发条目信息是 否有对应的标识; 如果是, 则 VFI ID管理模块将对应的标识发送给交换设备的主控处 理单元或线卡; 如果否, 则 VFI ID管理模块为 VPLS转发条目信息分配对应的标识, 并将对应的标识发送给交换设备的主控处理单元或线卡。 优选地, 步骤 S404可以包括: 交换设备接收到报文后, 查找转发表中与一条路径 具有不同标识的路径; 广播设备使用具有不同标识的路径广播报文。 实施例二 本实施例提供了一种报文阻塞决策管理方法, 该方法用于防止正常的广播流量在 具备相同的入口属性和出口属性的情况下被当前设备丢弃, 从而阻塞正常的广播报文 转发。 本实施例设置 VPLS业务实例在 AC侧和 PW侧的实例序列标识, 用于标识 AC 侧的不同接入和 PW侧的不同伪线, 并同步写入硬件转发表。 在报文转发时, 区别数 据源和数据目的的类型 (AC或 PW)、 数据源入口所对应的实例序列标识与出口方向 的序列标识, 相同时丢弃报文, 否则, 按正常流量转发。 其中, 实例序列标识是基于报文转发的封装信息分配的, 与报文出口封装信息一 一对应。 不同的报文出口封装信息绑定不同的实例序列标识。 本实施例通过比较入口实例序列标识与出口方向的序列标识来决定流量丢弃或者 转发, 解决了 VPLS同端口不同接入间不能互通广播流量的问题。 并且, 通过设置实 例标识, 可以不改变原有广播机制, 同时还降低了以太网交换机 (包括分布式和集中 式) 复杂组网对硬件的性能要求, 既不增加硬件成本, 又提高了 VPLS网络结构的可 扩展性。 本实施例中的交换机包括主控处理单元和线卡板若干。 为方便描述, VPLS 实例 序列标识简称为 VFI ID (Virtual Switch Instance Identifier, 虚拟转发实例 ID)。 下面以 分布式交换机的实现方法为例对本实施例的实现过程进行说明, 该实现过程包括: 步骤 1,主控上生成新的 VPLS转发条目信息,调用 VFI ID管理模块提供的 VFI ID 分配接口。 步骤 2, VFI ID管理模块判断是否需要分配 VFI ID, 如果不存在对应该转发条目 的 VFI ID则分配 VFI ID, 否则不做处理。 VFI ID模块建立转发条目与 VFI ID关联, 保证不同的转发条目对应不同的 VFI ID。 步骤 3, 主控下发转发条目同步信息和 VFI ID给线卡驱动。 步骤 4, 线卡驱动接受转发条目信息和 VFI ID。 再判断是否需要写驱动 (将信息 写入硬件转发表), 如果是则完成写驱动过程, 否则转入步骤 5。 步骤 5, 转发信息和 VFI ID同步完成, 退出该转发条目同步过程。 另外, 主控删除转发条目信息时调用释放接口回收 VFI ID, BP , VFI ID回收与转 发条目删除一致。 其中, 步骤 1中主控上生成的转发条目信息主要包括: 主控上配置 VPLS实例、 协议(例如, LDP (Label Distribution Protocol, 标签分布协议))等产生的本地实例和 远端 PW实例所关联的转发路径。 其中, 步骤 2中 VFI ID模块需要维护 VFI ID表, 根据平台传下来的转发条目关 键字查找 VFI ID表, 判断该条目是否已经分配了对应的 VFI ID值, 如果已经分配, 则将找到的 VFI ID返回给平台。 另外, 也可以处理为平台不发送 VFI ID给线卡, 线 卡在接收到转发条目信息后根据关键字去查 VFI ID表获取 VFI ID。 其中, 步骤 4线卡 VFI ID模块可以根据需要选择是否维护 VFI ID表。 其中, 步骤 5中线卡驱动判断是否需要写驱动,判断依据为主控上新的转发条目、 转发条目信息更新触发的转发条目同步需要写驱动, 其他情况下不需要写驱动。 其中, 集中式交换机的线卡和主控合一, 由同一控制单元完成以上功能。 本发明实施例在现有域划分处理广播报文机制的基础上, 增加基于全局的业务实 例序列标识进行流量阻塞决策管理的方法, 防止具备入口属性和出口属性相同特性的 正常广播流量被丢弃。 与相关技术相比, 本实施例通过同步实例序列号比较和更加完 善的报文流量阻塞决策机制, 进行广播报文的流量丢弃或转发决策。 本实施例在不改 变原有域划分机制防止广播风暴出现的基础上, 解决了域划分带来的异常阻塞广播报 文的问题, 降低了对硬件的要求, 提高了 VPLS网络扩展性。 实施例三 下面结合附图对本发明实施例中的 VFI ID分配和同步处理方法对本发明实施例 的实现过程进行说明。 图 5是根据本发明实施例的 VFI ID分配和同步的方法流程图, 如图 5所示, 该流 程包括步骤 S502至步骤 S516。 步骤 S502, 主控上由于配置或者协议生成新的转发条目。 主控调用主控 VFI ID 模块提供的 VFI ID分配释放接口。 步骤 S504, VFI ID模块判断是否已存在 VFI ID, 如果是, 则进行步骤 S506, 否 贝 U, 进行步骤 S508。 步骤 S506, VFI ID模块根据转发条目信息 (AC和 PW所在转发路径对应的出口 封装属性信息) 去查 VFI ID表, 获得该转发条目已分配的 VFI ID。 步骤 S508, VFI ID模块为该转发条目分配 VFI ID, 并增加已分配记录, 建立转 发条目封装信息与 VFI ID的对应关系表。 步骤 S510, 主控下发转发条目同步信息和 VFI ID给线卡。 步骤 S512〜S514, 线卡接受主控下发的信息后, 判断该转发条目信息是否写驱动 成功, 如果是则转步骤 S516, 不写驱动, 并返回写驱动成功; 如果否, 如果是新条目 添加, 则将转发信息和 VFI ID信息写 VPLS转发表, 如果是旧条目信息变化, 则更新 VPLS转发表。 步骤 S516, 返回成功。 需要注意的是, 对于支持主备倒换功能的交换机 (不仅有主控板, 还有备用板), 备用板上也需要维护转发条目封装信息与 VFI ID的对应关系表。同步实例序列号以选 择依靠 VPLS 业务主控向备用板进行转发条目信息同步的同步机制或者其他同步机 制。 另外, 对于实例序列标识资源的回收处理, 在实例失效时, 也就是在协议或者配 置命令下发转发条目删除时进行回收。 另外, 对于业务量小, 转发条目标识一定的情况 (比如存在 PW ID 标识不同的 PW伪线业务, 如总共支持 16K, 大小固定), 可以选择固定分配方式 (如, 选择 16K 数字作为实例标识, 与 PW ID建立固定映射关系), 不回收实例序列标识资源。 图 6是根据本发明实施例的 AC侧广播报文处理流程示意图, 如图 6所示, 该流 程包括步骤 S602至步骤 S616。 步骤 S602, 报文通过入端口进入入口线卡。 步骤 S604, 入口芯片进行报文解析, 获取入端口 AC属性信息(包括 VLAN TAG 属性信息)。 步骤 S606, 查找转发表, 获取出端口 AC转发信息和入端口 AC对应的 VFI ID。 并将查找的信息发送给交换处理单元 (可以根据交换机实现机制不同来决定此交换处 理单元在主控还是线卡上)。 步骤 S608,交换处理单元根据出端口 AC转发信息将携带入端口 AC对应的 VFI ID 信息和出端口转发属性信息的报文交换至出端口芯片所在线卡。 步骤 S610, 出端口芯片根据出端口转发信息查找转发表获取出端口 AC 对应的 VFI ID和封装信息。 步骤 S612, 报文阻塞决策管理模块比较入端口 AC对应的 VFI ID信息与出端口 对应的 VFI ID是否相同, 如果是, 则进行步骤 S614, 否则, 进行步骤 S616。 步骤 S614, 丢弃流量。 步骤 S616, 根据封装信息完成报文封装, 最终完成报文转发。 图 7是根据本发明实施例的 PW侧广播报文处理流程示意图, 如图 7所示, 该流 程包括步骤 S702至步骤 S716。 步骤 S702, 报文通过入端口进入入口线卡。 步骤 S704, 入口芯片进行报文解析, 获取入端口 PW属性信息。 步骤 S706, 查找转发表, 获取出端口 PW转发属性信息和入端口 PW对应的 VFI ID。 并将获取的信息发送给交换处理单元 (可以根据交换机实现机制不同决定此交换 处理单元在主控还是线卡上)。 步骤 S708,交换处理单元根据出端口 PW转发属性信息将携带入端口 PW对应的 VFI ID信息和出端口转发属性信息的报文交换至出端口芯片所在线卡。 步骤 S710, 出端口芯片根据出端口转发属性信息查找转发表获取出端口 PW对应 的 VFI ID和封装信息。 步骤 S712, 报文阻塞决策管理模块, 比较入端口 PW对应的 VFI ID信息和出端 口对应的 VFI ID信息是否相同, 是则进行步骤 S714, 否则进行步骤 S716。 步骤 S714, 丢弃流量。 步骤 S716, 根据封装信息完成报文封装, 最终完成 PW侧报文转发。 本实施例所述的报文阻塞决策管理方法可以应用于 L2VPN业务以及其他由于域 划分产生的报文阻塞的分布式和集中式交换机, 只要将报文转发信息与业务实例序列 标识对应, 并结合原有报文广播决策机制, 通过比较入端口实例序列标识与出端口实 例序列标识, 来决策报文转发或丢弃, 即可实现本实施例所述的报文广播。 在本实施例的基础上还可以进行相应的变换, 例如, 可以针对多线卡选取全局唯 一的实例标识, 也可以选取针对单线卡的局部唯一标识; 可以自定义标识, 也可以取 业务属性关联的属性标示 (比如 PW ID、 PW入标签等) 作为实例标识。 进一步地, 完成流量阻塞决策可以在入口芯片, 也可以在出口芯片处。 实施例四 本实施例提供了一种域划分时报文的广播装置, 该装置用于实现上述实施例所述 的方法。 其中, 该装置可以为交换机等交换设备。 图 8是根据本发明实施例的域划分时报文的广播装置的结构框图, 如图 8所示, 该装置包括: 设置模块 82, 设置为为域内的路径设置标识; 接收模块 84, 耦合至设置 模块 82, 设置为从一条路径接收报文; 广播模块 86, 耦合至接收模块 84, 设置为使 用与这一条路径具有不同标识的路径广播报文。 图 9是根据本发明实施例的设置模块的结构框图,如图 9所示,设置模块 82包括: 生成子模块 92, 设置为生成域内的路径对应的虚拟专用局域网业务 VPLS转发条目信 息; 获取子模块 94, 耦合至生成子模块 92, 设置为获取 VPLS转发条目信息对应的标 识; 确定子模块 96, 耦合至获取子模块 94, 设置为确定转发表内没有 VPLS转发条目 信息; 记录子模块 98, 耦合至确定子模块 96, 设置为将 VPLS转发条目信息和标识写 入转发表。 在本发明实施例的另一个优选实例中, 生成子模块 92和获取子模块 94位于交换 设备的主控处理单元中。 在本发明实施例的又一个优选实例中,获取子模块 94位于交换设备的主控处理单 元中, 获取子模块 94位于交换设备的线卡中, 获取子模块 94设置为生成 VPLS转发 条目信息; 主控处理单元设置为将 VPLS转发条目信息发送给线卡; 线卡设置为获取 VPLS转发条目信息对应的标识。 综上所述, 本发明实施例实现了基于业务实例序列的报文阻塞决策机制, 消除了 复杂组网与防止广播风暴的域划分方案之间的矛盾, 降低了报文阻塞决策机制的复杂 度, 降低了硬件成本, 同时, 通过单板转发和跨板转发的统一处理, 提高了芯片转发 灵活度。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布在多个计算装置所 组成的网络上, 可选地, 它们可以用计算装置可执行的程序代码来实现, 从而, 可以 将它们存储在存储装置中由计算装置来执行, 并且在某些情况下, 可以以不同于此处 的顺序执行所示出或描述的步骤, 或者将它们分别制作成各个集成电路模块, 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。 这样, 本发明不限制于任 何特定的硬件和软件结合。 以上仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领域的技术人 员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内, 所作的任何 修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种域划分时报文的广播方法, 包括:
交换设备为域内的路径设置标识;
所述交换设备从一条路径接收到报文后, 使用与所述一条路径具有不同标 识的路径广播所述报文。
2. 根据权利要求 1的方法, 其中, 交换设备为域内的路径设置标识包括:
所述交换设备生成所述域内的路径对应的虚拟专用局域网业务 VPLS转发 条目信息, 并获取所述 VPLS转发条目信息对应的标识;
所述交换设备确定转发表内没有所述 VPLS转发条目信息; 所述交换设备将所述 VPLS转发条目信息和所述标识写入所述转发表。
3. 根据权利要求 2的方法, 其中, 所述交换设备生成 VPLS转发条目信息, 并获 取所述 VPLS转发条目信息对应的标识包括:
所述交换设备的主控处理单元生成所述 VPLS 转发条目信息并获取所述 VPLS转发条目信息对应的标识。
4. 根据权利要求 2的方法, 其中, 所述交换设备生成 VPLS转发条目信息, 并获 取所述 VPLS转发条目信息对应的标识包括:
所述交换设备的主控处理单元生成所述 VPLS转发条目信息; 所述主控处理单元将所述 VPLS 转发条目信息发送给所述交换设备的线 卡;
所述线卡获取所述 VPLS转发条目信息对应的标识。
5. 根据权利要求 2至 4中任一项的方法, 其中, 获取所述 VPLS转发条目信息对 应的标识包括:
所述交换设备的虚拟转发实例标识 VFI ID管理模块判断所述 VPLS转发条 目信息是否有对应的标识;
如果是,则所述 VFI ID管理模块将所述对应的标识发送给所述交换设备的 主控处理单元或线卡; 如果否,则所述 VFI ID管理模块为所述 VPLS转发条目信息分配对应的标 识, 并将所述对应的标识发送给所述交换设备的主控处理单元或线卡。 根据权利要求 2至 4中任一项的方法, 其中, 所述交换设备从一条路径接收到 报文后, 使用与所述一条路径具有不同标识的路径广播所述报文包括:
所述交换设备接收到所述报文后, 查找转发表中与所述一条路径具有不同 标识的路径;
广播设备使用所述具有不同标识的路径广播所述报文。 一种域划分时报文的广播装置, 包括:
设置模块, 设置为为域内的路径设置标识;
接收模块, 设置为从一条路径接收报文;
广播模块,设置为使用与所述一条路径具有不同标识的路径广播所述报文。 根据权利要求 7的装置, 其中, 所述设置模块包括: 生成子模块, 设置为生成所述域内的路径对应的虚拟专用局域网业务 VPLS转发条目信息;
获取子模块, 设置为获取所述 VPLS转发条目信息对应的标识; 确定子模块, 设置为确定转发表内没有所述 VPLS转发条目信息; 记录子模块, 设置为将所述 VPLS转发条目信息和所述标识写入所述转发 表。 根据权利要求 8的装置, 其中, 所述生成子模块和所述获取子模块位于所述交 换设备的主控处理单元中。 根据权利要求 8的装置, 其中, 所述获取子模块位于所述交换设备的主控处理 单元中, 所述获取子模块位于所述交换设备的线卡中,
所述获取子模块设置为生成所述 VPLS转发条目信息;
所述主控处理单元设置为将所述 VPLS转发条目信息发送给所述线卡; 所述线卡设置为获取所述 VPLS转发条目信息对应的标识。
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