WO2021013233A1 - Evpn报文转发方法、系统、存储介质和终端 - Google Patents
Evpn报文转发方法、系统、存储介质和终端 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
- H04L12/4645—Details on frame tagging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
- H04L12/4645—Details on frame tagging
- H04L12/465—Details on frame tagging wherein a single frame includes a plurality of VLAN tags
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/66—Layer 2 routing, e.g. in Ethernet based MAN's
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2212/00—Encapsulation of packets
Definitions
- the embodiments of the present application relate to, but are not limited to, the field of network communication technology, for example, relate to a method, system, storage medium, and terminal for forwarding Ethernet virtual private network (Ethernet VPN, EVPN) packets.
- Ethernet virtual private network Ethernet VPN, EVPN
- EVPN is a Layer 2 Virtual Private Network (Virtual Private Network, VPN) technology.
- the core convergence layer of the control plane of EVPN uses the MultiProtocol Border Gateway Protocol (MP-BGP) for media access control (Media Access Control, MAC) and routing information transmission, and forwarding entries does not depend on data plane learning carry out.
- MP-BGP MultiProtocol Border Gateway Protocol
- MAC Media Access Control
- EVPN introduces the concept of Ethernet Segment (ES).
- ES Ethernet Segment
- a customer-side edge device (CE) is connected to one or more network-side edge devices (Provider Edge, PE) through a set of Ethernet links
- PE network-side edge devices
- An ES is identified by a unique Ethernet Segment Identifier (ESI) in the EVPN network.
- ESI Ethernet Segment Identifier
- EVPN supports three types of packet encapsulation, namely Multi-Protocol Label Switching (MPLS) EVPN, Provider Backbone Bridge (PBB) EVPN, and Virtual Extensible LAN (Virtual Extensible LAN). Virtual eXtensible Local Area Network, VXLAN) EVPN.
- MPLS Multi-Protocol Label Switching
- PBB Provider Backbone Bridge
- VXLAN Virtual Extensible LAN
- VXLAN Virtual eXtensible Local Area Network
- EVPN introduces a multi-homing access method
- the multi-homing access method introduces redundant links, causing loops in the network.
- the network-side edge device PE1 receives a packet from the customer-side edge device CE1. After being forwarded by the network-side edge device PE1 and the network-side edge device PE2, it returns to CE1, thus forming a loop.
- the direct consequence is a broadcast storm.
- Request For Comments 7432 Request For Comments 7432, RFC7432
- non-DF non-designated Forwarder
- Unknown unicast, multicast (Broadcast, Unknown- unicast, Muticast, BUM) messages there is no restriction that non-DF cannot receive (or receive and forward) BUM messages from the ES side.
- This DF filtering rule can deal with the "duplicate packet filtering" situation, but it cannot solve the problem in the same ES. The situation of ringing.
- This application provides an EVPN message forwarding method, system, storage medium, and terminal, which can solve the problem of looping within the same ES in EVPN.
- This application provides a message forwarding method applied to EVPN in an Ethernet virtual private network, including:
- the message After receiving the message from the upstream device, if the message contains the Ethernet segment identifier ESI tag, read the ESI tag from the message, and obtain the Ethernet corresponding to the ESI tag according to the ESI tag Port of segment ES;
- the packet is discarded.
- This application also provides a message forwarding system applied to the Ethernet virtual private network EVPN, including:
- the label processing module is set to read the ESI label from the message and obtain the ESI label according to the ESI label if the message contains the ESI label of the Ethernet segment after receiving the message from the upstream device.
- the service processing module is set to read the outgoing port of the message
- the message processing module is configured to discard the message when the port of the Ethernet segment ES corresponding to the ESI label obtained according to the ESI label is the same as the outgoing port of the message.
- This application also provides a computer readable and writable storage medium that stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the aforementioned application to the Ethernet virtual private network EVPN is realized. Message forwarding method.
- This application also provides a message forwarding terminal applied to the Ethernet virtual private network EVPN, including:
- the memory is set to store computer executable instructions
- the processor is configured to execute the computer-executable instructions so as to implement the message forwarding method applied to the Ethernet virtual private network EVPN as described above.
- Fig. 1 is a schematic diagram of a loop within the same ES in EVPN in related technologies
- FIG. 2 is a flowchart of a method for forwarding messages applied to EVPN according to an embodiment of the application
- FIG. 3 is a schematic diagram of encapsulating an ESI label in a VXLAN EVPN message provided by an application embodiment
- FIG. 4 is a schematic diagram of the processing flow of the VXLAN EVPN loop chip provided by an embodiment of this application;
- FIG. 5 is a schematic diagram of the processing flow of the VXLAN EVPN lower loop chip provided by an embodiment of this application;
- Fig. 6 is a block diagram of a message forwarding system applied to EVPN provided by an embodiment of the application.
- the ESI label is introduced in MPLS EVPN.
- the ESI label is carried in the "Ethernet Auto-Discovery per Ethernet Segment (Ethernet AD per ES)" route.
- the corresponding ESI is learned from the label forwarding table corresponding to the ESI label.
- the ESI labeling scheme defined by RFC7432 will cause BUM messages to nest two layers of private network labels, that is, a label stack structure is formed. This is a common thing in MPLS encapsulation, but because VXLAN encapsulation does not define the VXLAN network identifier (VXLAN Network Identifier (VNI) label stack structure, the use of ESI labels in MPLS EVPN cannot be directly applied to VXLAN EVPN. For VXLAN EVPN, the problem of looping within the same ES needs to be solved.
- VNI VXLAN Network Identifier
- This application provides a message forwarding method applied to EVPN, which can be applied to VXLAN EVPN, as shown in Figure 2, the method includes:
- the upstream device may be a customer-side edge device CE and a network-side edge device PE; the message is a BUM message.
- the outgoing port of the message can be obtained by searching the MAC forwarding table.
- this application includes: after receiving a message from an upstream device, in the case that the message contains an ESI tag of the Ethernet segment identification, read the ESI tag from the message, and according to the ESI The tag obtains the port connected to the Ethernet segment ES corresponding to the ESI tag; reads the outgoing port of the message; the Ethernet segment ES port corresponding to the ESI tag obtained according to the ESI tag and the outgoing port of the message In the same situation, the message is discarded.
- This application can solve the problem of ring formation in the same ES in EVPN.
- the method when the upstream device includes the upstream user-side edge device CE, the method further includes: after receiving a packet from the upstream user-side edge device CE, after the access circuit is a non-designated transponder -In the case of DF, encapsulate the ESI tag in the received message.
- the AC is an independent link or circuit connecting CE and PE; the AC interface can be a physical interface or a logical interface; AC attributes include encapsulation type, maximum transmission unit (MTU), and interface of a specific link type parameter.
- encapsulating the ESI tag in the received message includes: adding an ESI tag field and an ESI tag value field to the header information of the received message; the ESI tag field It is used to mark whether an ESI tag is encapsulated in the header information.
- adding an ESI tag field and an ESI tag value field to the header information of the received message includes: adding more information in the reserved field of the header information of the message.
- One of the bits is used as the ESI tag field, and all or part of the bits in the Reserved field except for the one bit as the ESI tag field are reserved as the ESI tag value field; when the value of the ESI tag field is 0, it means The ESI tag is not encapsulated in the header information of the message; when the value of the ESI tag field is 1, it means that the content of the ESI tag value field is valid.
- Figure 3 shows a schematic diagram of encapsulating ESI tags in VXLAN EVPN packets.
- reading the ESI tag from the message includes: reading the header information of the message; according to the header
- the ESI tag field contained in the information determines whether the ESI tag is encapsulated in the header information, and in response to the determination result that the ESI tag is encapsulated in the header information, read from the ESI tag value field included in the header information Take the ESI tag value.
- the embodiment of the present application realizes the horizontal split of the EVPN access side, and solves the problem of looping within the same ES in the EVPN.
- the upstream device (PE1) and downstream device (PE2) need to be configured in this application example:
- MF.NHI0_Index next hop index in the descriptor
- EGR_NHI0_TABLE_MPLS outbound encapsulation next hop table
- MF.DVP destination virtual port in the descriptor
- EGR_NHI0.DVP outbound encapsulation next hop corresponding to the destination virtual port (multicast)
- Evlan_entry_vxlan vxlan outbound encapsulation hash table
- VNI virtual network identifier
- SD_TAG_ACTION service delimiter action
- EGR_DVP_ATTRIBUTE outbound destination virtual port attribute table
- DVP_ESI_INDEX destination virtual port ESI label index
- DVP_LEAF_INDEX destination virtual port LEAF label index
- EGR_ESI Outbound package ESI label
- EGR_SVP_ESI_INDEX_TABLE Outbound package ESI label index table
- EGR_LEAF_ENCAP_LABEL Outbound package leaf (LEAF) label.
- the ESI tag value is uniformly determined by the source virtual port and the destination virtual port, and the DVP index dvp_esi_ecap_index[28:24] of the encapsulated ESI tag is configured based on the destination virtual port (DVP).
- the ESI label encapsulation index of the destination virtual port is combined with the ESI label encapsulation index of the source virtual port to calculate the final index to find the ESI label value, that is, find svp_esi_encap_index[4:0] according to SVP, and find dvp_esi_ecap_index[28: 24]; Then use ⁇ svp_esi_encap_index, dvp_esi_ecap_index ⁇ as the index to find out ⁇ esi_label_vld[20:20], esi_label[19:0] ⁇ , and the BUM message sent from PE1 to PE2 carries this ESI label.
- MY_STATION_TCAM MY STATION TCAM table
- L3_TUNNEL_IP Layer 3 Internet Protocol (IP) tunnel hash (HASH) table
- mpls_entry_vxlan VXLAN attempt label entry
- SVP source virtual port
- VFI virtual forwarding instance
- L2_ENTRY L2 MAC Table
- Esi port ESI port
- svp network svp horizontal division network number
- dvp network dvp horizontal division network number.
- DF Configure the AC connecting CE1 to PE2 as DF.
- DF is responsible for forwarding BUM packets to ES.
- Non-DF cannot forward BUM packets to ES.
- SVP the SVP of the lower ring in the MPLS module
- mpls_entry_vxlan view KEY:VNI or VNI+SIP
- RESULT:SVP Configure the physical port number corresponding to the ESI label in the MPLS module, mpls_entry_mpls view, KEY: ESI, RESULT: ESI_SGLP.
- each ESI label corresponds to only one physical port number (including trunk port), and the port connected to CE1 in PE2 is the physical port number of the ESI label corresponding to PE2.
- the outgoing port corresponding to the next hop is the port connected to CE1 in PE2.
- VXLAN EVPN upper and lower loop message forwarding process
- BUM packets are sent from CE1 to PE1. Because AC is non-df, the packets received by PE1 and forwarded to PE2 are encapsulated with ESI labels.
- the message arrives at PE2, because CE1 accesses PE2's AC is DF, so it can receive and forward the BUM message.
- the ESI label in the message identifies that the port of the connected ES is the same as the outbound port of the message obtained through service forwarding. Packets are discarded to prevent the packets sent by CE1 from returning to CE1, and achieve VXLAN EVPN access side horizontal split.
- the embodiment of the present application also provides a message forwarding system applied to EVPN. As shown in FIG.
- the system includes: a label processing module 601, which is configured to include a message in the message after receiving a message from an upstream device
- a label processing module 601 which is configured to include a message in the message after receiving a message from an upstream device
- the upstream device may be a client-side edge
- the message is a BUM message
- the service processing module 602 is set to read the outgoing port of the message
- the message processing module 603 is set to obtain information based on the ESI tag If the port of the Ethernet segment ES corresponding to the ESI label is the same as the outgoing port of the packet, the packet is discarded.
- the upstream device includes the upstream user-side edge device CE; the label processing module 601 is further configured to receive a packet from the upstream user-side edge device CE, and the access circuit AC is a non-designated transponder.
- the ESI tag is encapsulated in the received message.
- the AC is an independent link or circuit connecting the CE and PE; the AC interface can be a physical interface or a logical interface; AC attributes include encapsulation type, maximum transmission unit MTU, and interface parameters of a specific link type.
- the tag processing module 601 is configured to encapsulate the ESI tag in the received message by adding an ESI tag to the header information of the received message Field, and an ESI tag value field; the ESI tag field is used to mark whether an ESI tag is encapsulated in the header information.
- the tag processing module 601 is configured to add an ESI tag field and an ESI tag value field to the header information of the received message in the following manner: One bit in the Reserved field of the information is reserved as the ESI flag field, and all or part of the bits in the Reserved field except the one bit as the ESI flag field are reserved as the ESI tag value field; the value in the ESI flag field is 0 In this case, it means that the ESI tag is not encapsulated in the header information of the message; when the value of the ESI tag field is 1, it means that the content of the ESI tag value field is valid.
- Figure 3 shows a schematic diagram of encapsulating ESI tags in VXLAN EVPN packets.
- the tag processing module 601 is configured to read the ESI tag from the message when the message contains the Ethernet segment identification ESI tag, including: reading the message Header information; judging whether the ESI tag is encapsulated in the header information according to the ESI tag field contained in the header information, and in response to the determination result that the ESI tag is encapsulated in the header information, from the header information Read the ESI tag value in the ESI tag value field contained in.
- the embodiment of the present application realizes the horizontal split of the EVPN access side, and solves the problem of looping within the same ES in the EVPN.
- the embodiment of the present application also provides a computer readable and writable storage medium.
- the medium stores computer-executable instructions.
- the computer-executable instructions When executed by a processor, the computer-executable The message forwarding method of private network EVPN.
- the embodiment of the application also provides a message forwarding terminal applied to the Ethernet virtual private network EVPN, including: a memory, configured to store computer executable instructions; a processor, configured to execute the computer executable instructions to achieve The message forwarding method applied to the Ethernet virtual private network EVPN as described in the previous embodiment.
- Such software may be distributed on a computer-readable medium, and the computer-readable medium may include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium).
- the term computer storage medium includes volatile and non-volatile memory implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Flexible, removable and non-removable media.
- Computer storage media include, but are not limited to, Random Access Memory (RAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), and flash memory Or other memory technologies, portable compact disk read-only memory (Compact Disc Read-Only Memory, CD-ROM), digital versatile disk (Digital Video Disc, DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic A storage device, or any other medium that can be used to store desired information and can be accessed by a computer.
- communication media usually contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as carrier waves or other transmission mechanisms, and may include any information delivery media .
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Abstract
Description
Claims (10)
- 一种应用于以太网虚拟专用网EVPN的报文转发方法,包括:从上游设备接收到报文后,在报文中包含以太网段标识ESI标签的情况下,从所述报文中读取ESI标签,并根据所述ESI标签获取所述ESI标签对应的以太网段ES的端口;读取所述报文的出端口;在根据所述ESI标签获取的所述ESI标签对应的以太网段ES的端口与所述报文的出端口相同的情况下,丢弃所述报文。
- 根据权利要求1所述的应用于EVPN的报文转发方法,其中,在所述上游设备包括上游用户侧边缘设备CE的情况下,还包括:从上游用户侧边缘设备CE接收到报文后,在接入电路AC是非指定转发器non-DF的情况下,在接收到的所述报文中封装ESI标签。
- 根据权利要求2所述的应用于EVPN的报文转发方法,其中,在接收到的所述报文中封装ESI标签,包括:在接收到的所述报文的头部信息中增加ESI标记字段,以及ESI标签值字段;所述ESI标记字段用于标记所述头部信息中是否封装有ESI标签。
- 根据权利要求3所述的应用于EVPN的报文转发方法,其中,在接收到的所述报文的头部信息中增加ESI标记字段,以及ESI标签值字段,包括:将所述报文的头部信息的保留Reserved字段中的多位中1位作为ESI标记字段,将所述Reserved字段中除作为ESI标记字段的1位以外的全部位或部分位作为ESI标签值字段;在所述ESI标记字段的值为0的情况下,表示所述报文的头部信息中未封装ESI标签;在所述ESI标记字段的值为1的情况下,表示所述ESI标签值字段内容有效。
- 根据权利要求1至4中任一项所述的应用于EVPN的报文转发方法,其中,在报文中包含以太网段标识ESI标签的情况下,从所述报文中读取ESI标签,包括:读取所述报文的头部信息;根据所述头部信息包含的ESI标记字段判断所述头部信息中是否封装有ESI标签,响应于所述头部信息中封装有ESI标签的判断结果,从所述头部信息中 包含的ESI标签值字段中读取ESI标签值。
- 一种应用于以太网虚拟专用网EVPN的报文转发系统,包括:标签处理模块,设置为从上游设备接收到报文后,在报文中包含以太网段标识ESI标签的情况下,从所述报文中读取ESI标签,并根据所述ESI标签获取所述ESI标签对应的以太网段ES的端口;业务处理模块,设置为读取所述报文的出端口;报文处理模块,设置为在根据所述ESI标签获取的所述ESI标签对应的以太网段ES的端口与所述报文的出端口相同的情况下,丢弃所述报文。
- 根据权利要求6所述的应用于EVPN的报文转发系统,其中,所述上游设备包括上游用户侧边缘设备CE;标签处理模块,还设置为从上游用户侧边缘设备CE接收到报文后,在接入电路AC是非指定转发器non-DF的情况下,在接收到的所述报文中封装ESI标签;所述标签处理模块,是设置为通过如下方式在接收到的所述报文中封装ESI标签:在接收到的所述报文的头部信息中增加ESI标记字段,以及ESI标签值字段;所述ESI标记字段用于标记所述头部信息中是否封装有ESI标签。
- 根据权利要求7所述的应用于EVPN的报文转发系统,其中,标签处理模块,设置为通过如下方式在接收到的所述报文的头部信息中增加ESI标记字段,以及ESI标签值字段:将所述报文的头部信息的保留Reserved字段中的1位作为ESI标记字段,将所述Reserved字段中除作为ESI标记字段的1位以外的全部位或部分位作为ESI标签值字段;在所述ESI标记字段的值为0的情况下,表示所述报文的头部信息中未封装ESI标签;在所述ESI标记字段的值为1的情况下,表示所述ESI标签值字段内容有效。
- 一种计算机可读写存储介质,存储有计算机可执行指令,所述计算机可执行指令被处理器执行时实现如权利要求1至5中任一项所述的应用于以太网虚拟专用网EVPN的报文转发方法。
- 一种应用于以太网虚拟专用网EVPN的报文转发终端,包括:存储器,设置为存储计算机可执行指令;处理器,设置为执行所述计算机可执行指令,以实现如权利要求1至5中任一项所述的应用于以太网虚拟专用网EVPN的报文转发方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US17/618,293 US20220368628A1 (en) | 2019-07-24 | 2020-07-24 | Evpn packet forwarding method, system, storage medium, and terminal |
KR1020217041598A KR20220007742A (ko) | 2019-07-24 | 2020-07-24 | Evpn 패킷 포워딩 방법, 시스템, 저장 매체 및 단말기 |
JP2021574895A JP2022537296A (ja) | 2019-07-24 | 2020-07-24 | Evpnメッセージ転送方法、システム、記憶媒体及び端末 |
EP20843511.5A EP3975486A4 (en) | 2019-07-24 | 2020-07-24 | EVPN PACKET FORWARDING METHOD, SYSTEM, STORAGE MEDIUM AND TERMINAL |
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CN201910671346.7A CN112311643B (zh) | 2019-07-24 | 2019-07-24 | 一种evpn报文转发方法、系统、存储介质和终端 |
CN201910671346.7 | 2019-07-24 |
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CN113765806A (zh) * | 2021-09-02 | 2021-12-07 | 烽火通信科技股份有限公司 | Mac地址学习方法、装置、设备及可读存储介质 |
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CN113992573B (zh) * | 2021-10-26 | 2023-03-31 | 新华三信息安全技术有限公司 | 一种转发bum流量的方法、装置、pe设备及存储介质 |
CN116827862A (zh) * | 2022-03-22 | 2023-09-29 | 中兴通讯股份有限公司 | 路由发布方法、装置、存储介质及电子装置 |
CN114679405B (zh) * | 2022-04-12 | 2023-07-25 | 烽火通信科技股份有限公司 | SRv6报文转发方法、存储介质、电子设备及装置 |
CN117640505A (zh) * | 2022-08-09 | 2024-03-01 | 中兴通讯股份有限公司 | 一种数据报文处理方法、装置、存储介质及电子装置 |
CN118573512A (zh) * | 2023-02-28 | 2024-08-30 | 中兴通讯股份有限公司 | 一种evpn的报文传输方法、装置、设备及介质 |
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