WO2017219859A1 - 跨域边缘设备、分层vpls网络及其广播流量的处理方法 - Google Patents

跨域边缘设备、分层vpls网络及其广播流量的处理方法 Download PDF

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Publication number
WO2017219859A1
WO2017219859A1 PCT/CN2017/087403 CN2017087403W WO2017219859A1 WO 2017219859 A1 WO2017219859 A1 WO 2017219859A1 CN 2017087403 W CN2017087403 W CN 2017087403W WO 2017219859 A1 WO2017219859 A1 WO 2017219859A1
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domain
vpls
pseudowire
edge device
broadcast traffic
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PCT/CN2017/087403
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English (en)
French (fr)
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吴学智
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • 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
    • H04L45/02—Topology update or discovery
    • H04L45/04—Interdomain routing, e.g. hierarchical routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/16—Arrangements for providing special services to substations
    • H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/185—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with management of multicast group membership
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • 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
    • H04L45/38—Flow based routing
    • 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
    • H04L45/68—Pseudowire emulation, e.g. IETF WG PWE3

Definitions

  • the present disclosure relates to the field of communications, for example, to a cross-domain edge device, a layered virtual private local area network service VPLS network, and a method for processing broadcast traffic thereof.
  • a Layered Virtual Private LAN Service (VPLS) (H-VPLS) solution is defined in RFC4762 (Virtual Private LAN Service (VPLS) Using Label Distribution Protocol (LDP) Signaling).
  • RFC4762 Virtual Private LAN Service
  • LDP Label Distribution Protocol
  • this figure shows a network diagram of a hierarchical VPLS based on RFC4762.
  • VPLS domains To connect two fully-connected VPLS domains (hereinafter referred to as VPLS domains), you need to pass VPLS domains on two border edge devices (Provider Edge, PE).
  • a pseudo-line (Pseudo Wire, PW) of the spoke type is established, and the pseudo-line of the access type is referred to as an access pseudo-line.
  • the PEs in the fully connected VPLS domain are connected by pseudowires.
  • the PE receives only one broadcast message.
  • only one central domain is restricted in the related VPLS scheme.
  • the two VPLS domains cannot overlap on one boundary PE, that is, cannot be implemented in the VPLS network.
  • Multiple horizontal VPLS domains are divided.
  • the present disclosure provides a method for processing a cross-domain edge device, a layered VPLS network, and a broadcast traffic thereof, which can avoid overlapping two VPLS domains that cannot be overlapped on one boundary PE when performing VPLS domain division in a VPLS network. phenomenon.
  • a method for processing broadcast traffic including:
  • the first VPLS domain and the second in the VPLS network of the layered virtual private LAN service configures the domain pseudowire with the first domain identifier in the first VPLS domain, and configures the edge device with the second domain identifier in the second VPLS domain.
  • the cross-domain edge device When the cross-domain edge device receives the broadcast traffic from the domain pseudowire containing the first domain identifier, the cross-domain edge device sends the broadcast traffic through the domain pseudowire without the first domain identifier;
  • the cross-domain edge device When the cross-domain edge device receives the broadcast traffic from the domain pseudowire containing the second domain identifier, the cross-domain edge device sends the broadcast traffic through the domain pseudowire without the second domain identifier.
  • the edge device connected to the cross-domain edge device is located in the first VPLS domain and the second VPLS domain at the same time, the edge device is configured to include the edge device A domain identifier and a domain pseudowire of the second domain identifier.
  • the method includes: when the first VPLS domain and the other edge devices in the second VPLS domain respectively configure a central pseudowire to the edge device connected thereto, and receive broadcast traffic through the central pseudowire, The broadcast traffic is not sent through the domain pseudowire and other central pseudowires.
  • the method further includes:
  • the cross-domain edge device When the cross-domain edge device receives the broadcast traffic through the access pseudowire, and sends the broadcast traffic through all other pseudowires except the access pseudowire, and the cross-domain edge device has an access circuit, The access circuit transmits the broadcast traffic; wherein
  • the hierarchical VPLS domain includes a third VPLS domain, and the third VPLS domain is connected to at least one of the cross-domain edge devices by using the access pseudowire.
  • the method further includes: when the cross-domain edge device receives broadcast traffic from a domain pseudowire, sending the broadcast traffic through the access pseudowire, and the cross-domain edge device has an access circuit Transmitting the broadcast traffic to the access circuit.
  • a cross-domain edge device that includes:
  • a configuration module configured to configure, in the first VPLS domain, a domain pseudowire with a first domain identifier for an edge device connected to the cross-domain edge device, and for connecting to the cross-domain edge device in a second VPLS domain
  • the edge device configures a domain pseudowire containing the second domain identifier
  • a forwarding control module configured to: when receiving broadcast traffic from a domain pseudowire containing the first domain identifier, send the broadcast traffic through a domain pseudowire that does not include the first domain identifier, and in the second domain identifier When the domain pseudowire receives the broadcast traffic, the broadcast traffic is sent through the domain pseudowire that does not include the second domain identifier;
  • the inter-domain edge device is located in the first VPLS domain and the second VPLS domain in the layered VPLS network at the same time.
  • the configuration module is further configured to: when the edge device connected to the cross-domain edge device is located in the first VPLS domain and the second VPLS domain, for other edges connected to the cross-domain edge device
  • the device configuration includes a domain pseudowire of the first domain identifier and a domain pseudowire including the second domain identifier.
  • the forwarding control module is further configured to: when the cross-domain edge device is connected to the third VPLS domain by using an access pseudowire, and receives broadcast traffic through the access pseudowire, All other pseudowires of the pseudowire transmit the broadcast traffic, and when the inter-edge edge device has an access circuit, send the broadcast traffic to the access circuit, wherein the layered VPLS domain includes the third VPLS area.
  • the forwarding control module is further configured to: when the broadcast traffic is received from a domain pseudowire, the broadcast traffic is sent by using the access pseudowire, and when the cross-domain edge device has an access circuit, The access circuit transmits the broadcast traffic.
  • a hierarchical VPLS network comprising a first VPLS domain and a second VPLS domain, wherein at least one cross-domain edge device is located in the first VPLS domain and the second VPLS domain at the same time;
  • the cross-domain edge device is configured to configure, in the first VPLS domain, a domain pseudowire with a first domain identifier for an edge device connected thereto, and configure, in a second VPLS domain, a second domain identifier for the edge device connected thereto Domain pseudowire;
  • the cross-domain edge device is further configured to: when receiving the broadcast traffic from the domain pseudowire containing the first domain identifier, send the broadcast traffic through the domain pseudowire without the first domain identifier, from the second domain identifier When receiving the broadcast traffic on the domain pseudowire, the inter-domain edge device sends the broadcast traffic through the domain pseudowire without the second domain identifier.
  • a computer readable storage medium storing computer executable instructions arranged to perform the method of any of the above.
  • the first VPLS domain and the second VPLS domain are divided in the hierarchical VPLS network, and the first VPLS domain and the second VPLS domain are overlapped on at least one inter-AS edge device, that is, the inter-domain edge device is located in the first VPLS domain. And the second VPLS domain.
  • the inter-domain edge device configures a domain pseudowire with the first domain identifier for the edge device connected thereto in the first VPLS domain, and configures the domain pseudo with the second domain identifier for the edge device connected thereto in the second VPLS domain.
  • the solution provided by the embodiment of the present invention may be configured to divide multiple VPLS domains that overlap on at least one border PE in the VPLS network, that is, to implement multiple horizontal VPLS domains in the VPLS network. You can optimize the deployment of the VPLS network, save the number of network devices, and reduce the cost of VPLS network deployment.
  • FIG. 1 is a schematic diagram of networking of a hierarchical VPLS service based on RFC4762;
  • FIG. 2 is a schematic flowchart of a method for processing broadcast traffic in a layered VPLS network according to the first embodiment
  • FIG. 3 is a schematic diagram of a cross-domain PE structure provided by a second embodiment
  • FIG. 4 is a schematic diagram of a cross-domain PE structure provided by a third embodiment
  • FIG. 5 is a schematic structural diagram of a layered VPLS network according to a fourth embodiment
  • FIG. 6 is a schematic structural diagram 1 of the layered VPLS network in FIG. 5;
  • FIG. 7 is a schematic flowchart of deploying a VPLS service in the networking environment of FIG. 6;
  • FIG. 8 is a schematic diagram of forwarding a broadcast message in FIG. 7;
  • FIG. 9 is a schematic structural diagram 2 of the layered VPLS network in FIG. 5;
  • FIG. 10 is a schematic diagram of forwarding a broadcast message in FIG. 9.
  • a method for processing broadcast traffic of a layered VPLS network includes the following steps.
  • step 210 the first VPLS domain and the second VPLS domain are divided in the hierarchical VPLS network, and the first VPLS domain and the second VPLS domain overlap on at least one cross-domain PE.
  • the inter-domain PE in this embodiment may be that the PE is located in at least two VPLS domains at the same time.
  • a cross-domain PE may be a PE that is shared by two VPLS domains or a PE that is shared by three or more VPLS domains.
  • a VPLS domain in this embodiment may be a fully connected VPLS domain, that is, a broadcast domain.
  • the inter-domain PE configures a domain PW with the first domain identifier for the PE connected to the inter-domain PE in the first VPLS domain, and configures the PE with the cross-domain edge device in the second VPLS domain.
  • the domain PW of the second domain identifier is the domain PW of the second domain identifier.
  • the PW is configured with the domain name of the PW in the VPLS domain, that is, the domain PW is configured in the inter-domain PE.
  • the first domain identifier of the inter-domain PE in the first VPLS domain is different from the second domain identifier of the inter-domain PE in the second VPLS domain.
  • the domain identifier of each VPLS domain in the inter-domain PE can be configured by the administrator and can be configured to take effect only on the configured device to control the forwarding of broadcast traffic and does not participate in edge-to-edge.
  • the inter-domain PEs in this embodiment may be located in two VPLS domains at the same time, or may be located in three or more VPLS domains at the same time.
  • a domain PW is in multiple VPLS domains, multiple domain identifiers can be configured for the domain PW.
  • step 230 when the inter-domain PE receives the broadcast traffic from the domain PW including the first domain identifier, the inter-domain PE sends the broadcast through the domain pseudowire without the first domain identifier.
  • the cross-domain edge device sends the broadcast traffic through the domain pseudowire without the second domain identifier when the cross-domain edge device receives the broadcast traffic from the domain pseudowire containing the second domain identifier.
  • the inter-domain PE sends the broadcast traffic through the domain pseudo-line without the first domain identifier, and may include sending broadcast traffic by using another domain PW whose domain identifier is different from the first domain identifier, and the domain identifier does not include the first domain identifier.
  • the other domain PW sends, for example, when each domain pseudowire of the two domain PWs is configured with multiple domain identifiers, and the domain identifiers included in the two domains have at least one same domain identifier, then the cross-domain PEs are from After the broadcast traffic received by a domain PW, the broadcast traffic is no longer forwarded to another domain PW. It is ensured that the device in each VPLS domain receives only one broadcast traffic, and multiple horizontal VPLS domains are allocated in the VPLS network.
  • each inter-domain PE configures a domain pseudowire with the first domain identifier and the The domain PW identified by the second domain.
  • the inter-domain edge device PE1 and the inter-domain edge device PE2 are located in the first VPLS domain and the second VPLS domain, and the domain identifier of the domain PW on the PE1 is configured as the first domain identifier and the second domain identifier, and the domain on the PE2.
  • the domain identifier of the PW is also configured as the first domain identifier and the second domain identifier.
  • a central PW (HUB PW) is configured for a PE that is connected to a PE other than the inter-AS PE in the first VPLS domain and the second VPLS domain, and the PE receives broadcast traffic through the central PW
  • the PE may not be sent to the domain PW and other central PWs, and the PE may send the broadcast traffic through all access pseudowires (spoke PWs) and access circuits (ACs).
  • the inter-domain PEs can be connected to the PEs in other VPLS domains by connecting the PWs.
  • the layered VPLS network may also be divided into a third VPLS domain, and the inter-domain PE is connected to one of the PEs of the third VPLS domain by connecting the PW.
  • the broadcast stream can be sent through all other PWs (including but not limited to the domain PW and the central PW), and when the inter-domain PE has the access circuit (AC), the The access circuit transmits the broadcast traffic.
  • the broadcast traffic when the inter-domain PE receives the broadcast traffic from the domain PW, the broadcast traffic is sent through the domain pseudowire without the first domain identifier and the pseudowire without the second domain identifier.
  • the connection PW sends the broadcast traffic direction
  • the inter-domain PE includes an access circuit (AC)
  • the broadcast traffic direction may also be sent through the access circuit.
  • the forwarding control of the broadcast traffic includes but is not limited to the following rules:
  • the PE can perform different forwarding processing according to the type of the PW.
  • the PW in this embodiment includes the following three types: a central PW, a connection PW, and a domain PW with a domain identifier.
  • a PW is a central PW
  • the PE can no longer forward broadcast packets received from the central PW to other central PWs and domain-named domains PW, but can send one broadcast message to all connected PWs and ACs.
  • the PE may send a broadcast message from the connected PW to all other PWs (including but not limited to the domain PW and the central PW) and the AC to send the broadcast message.
  • a PW is a domain PW with the domain ID1
  • the PE can no longer forward broadcast packets received from the domain PW to the domain PW and the central PW that contain the domain ID1, but can connect to the PW, AC, and others. Domain PW of domain ID ID1 is forwarded. If the PW of the two domain PWs is configured with multiple domain IDs, if the two domain PWs contain the same domain ID, the PE can not forward to another domain after receiving the broadcast packet from one of the domain PWs. The PW forwards the broadcast packet.
  • this embodiment provides a cross-domain PE, where the inter-domain PE can be located in the first VPLS domain and the second VPLS domain in the hierarchical VPLS network.
  • the inter-domain PE includes: a configuration module 31 and a forwarding control module 32.
  • the configuration module 31 is configured to configure, in the first VPLS domain, a domain PW with a first domain identifier for the PE connected to the inter-domain PE, and configure a second domain identifier for the PE connected to the inter-domain PE in the second VPLS domain. Domain pseudowire.
  • the configuration module 31 configures a domain identifier for the PW in the VPLS domain with the inter-domain PE, that is, configures a domain pseudowire.
  • the domain identifier in the first VPLS domain is different from the domain identifier in the second VPLS domain.
  • the cross-domain PE in this embodiment may be a PE that is located in at least two VPLS domains at the same time.
  • a VPLS domain in this embodiment may be a fully connected VPLS domain, that is, a broadcast domain.
  • the domain identifier of each domain PW on the inter-domain PE can be input by the administrator through the configuration module 31, and can be configured to take effect only on the configured device to control the forwarding of broadcast traffic.
  • the inter-domain PEs in this embodiment may be located in two VPLS domains at the same time, or may be located in three or more VPLS domains at the same time.
  • the configuration module 31 may configure multiple domain identifiers for the domain pseudowire.
  • the forwarding control module 32 is configured to: when receiving the broadcast traffic from the domain PW including the first domain identifier, send the broadcast traffic through the domain pseudowire without the first domain identifier, and in the domain from the second domain identifier When the pseudowire receives the broadcast traffic, the broadcast traffic is sent by the domain pseudowire that does not include the second domain identifier. For example, when each domain PW of the two domain PWs is configured with multiple domain identifiers, the two include If there is at least one of the same domain IDs in the domain ID, the inter-domain PE can not forward the broadcast traffic to the other domain PW after receiving the broadcast traffic from the PW. The PEs in each VPLS domain can only be received. To a broadcast traffic, multiple horizontal VPLS domains are partitioned in the VPLS network.
  • the configuration module 31 may be configured to configure the domain PW with the first domain identifier and the second domain for the other inter-domain PEs connected to the inter-domain PE when the multiple inter-domain edge devices are located in the first VPLS domain and the second VPLS domain. Domain ID of the domain PW.
  • the forwarding control module 32 may be further configured to send the broadcast through all other PWs (including but not limited to the domain PW and the central PW) when the inter-domain PE connects to the third VPLS domain through the connection PW and receives broadcast traffic through the connection PW. Flow, and when the inter-domain PE has an access circuit, the broadcast traffic can be sent to the access circuit.
  • PWs including but not limited to the domain PW and the central PW
  • the forwarding control module 32 may be further configured to send the broadcast traffic by connecting to the PW, and the cross-domain PE When there is an access circuit (AC), the broadcast traffic can also be sent to the access circuit.
  • AC access circuit
  • the modules or steps of the foregoing embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device.
  • the configuration module 31 and the forwarding control module 32 may be built in a processor of a cross-domain PE. Independently set up independently of the cross-domain PE processor, or distributed over a network of multiple computing devices.
  • the configuration module 31 and the forwarding control module 32 may be implemented by program code executable by the computing device, and the configuration module 31 and the forwarding control module 32 may be stored in a non-transitory storage medium (Read-Only) Memory, ROM) or random access memory (RAM), disk, optical disk, are executed by a computing device, and in some cases, may be performed in a different order than in the above embodiments.
  • the steps are described, or the modules of the above embodiments are separately fabricated into a plurality of integrated circuit modules, or a plurality of modules or steps in the above embodiments are fabricated into a single integrated circuit module.
  • the present embodiment provides a cross-domain edge device, which can be located in a first VPLS domain and a second VPLS domain in a hierarchical VPLS network, where the cross-domain edge device includes a processor 41 and a memory. 42.
  • the processor 41 is arranged to execute the modules in the memory 42, and the module performs the following process:
  • the cross-domain edge device sends the broadcast stream through a domain pseudowire that does not include the second domain identifier.
  • the embodiment provides a layered VPLS network, which includes a first VPLS domain (hereinafter referred to as domain A) and a second VPLS domain (hereinafter referred to as domain B), and at least one cross-domain edge device is located at the same time.
  • domain A first VPLS domain
  • domain B second VPLS domain
  • the inter-domain PE is configured to configure, in the broadcast domain A, the domain PW including the first domain identifier (hereinafter referred to as the domain ID (identification) A) for the PE connected thereto, and the PE configuration in the second VPLS domain for the PE configuration
  • the domain PW of the second domain identifier hereinafter referred to as domain ID B).
  • the inter-domain PE can also be set to receive broadcast traffic from the domain pseudowire containing the first domain identifier.
  • the domain pseudowire of the first domain identifier sends the broadcast traffic, and when the broadcast traffic is received from the domain pseudowire containing the second domain identifier, the cross-domain edge device sends the domain pseudowire without the second domain identifier.
  • the broadcast traffic The following describes the processing method of broadcast traffic by using several networking structures of the broadcast domain A and the broadcast domain B.
  • Figure 6 shows a schematic diagram of hierarchical networking of VPLS services in which two inter-domain PEs are located in two VPLS domains.
  • Domain A there are two VPLS domains, Domain A and Domain B.
  • PE1-AB is located in domain A at the same time.
  • domain B domain B.
  • step 710 in the domain A, the central PW is configured on other edge devices except PE1-AB.
  • the central PW is configured on other edge devices than PE1-AB.
  • a domain PW connected to other edge devices in domain A is configured, and for these domains PW, the domain ID is A.
  • a domain PW connected to other edge devices in domain B is configured, and for these domains PW, the domain ID is B.
  • the forwarding process for broadcast packets is as follows:
  • the PE may no longer forward the broadcast traffic received from the central PW to other central PWs and the domain-identified domain PW, but may send the broadcast traffic to all connected PWs and ACs;
  • the PE may send a broadcast packet received from the connected PW to all other PWs (including but not limited to the domain PW and the central PW) and the AC to transmit the broadcast traffic;
  • the PE can no longer forward broadcast packets received from the domain PW to the domain PW and the center PW that contain the same domain identifier ID1, but can connect to the PW, AC, and other If the domain PW of each domain PW is configured with multiple domain identifiers, if the two domain PWs contain the same domain identifier, the PE receives the broadcast from one of the domains PW. After the message, the broadcast traffic can be forwarded without going to another domain PW.
  • FIG. 8 is a schematic diagram of broadcast packet forwarding in a VPLS service hierarchical networking including an inter-domain PE in multiple VPLS domains.
  • FIG. 8 is a dotted line indicating a guest in domain A.
  • CE Customer Edge
  • the forwarding process of broadcast packets is as follows.
  • PE2-A receives the broadcast packet from CE1.
  • PE2-A detects that the broadcast packet is received from the AC.
  • the broadcast packet is sent to all PWs.
  • the broadcast packets are sent to PE3-A and PE1- respectively. AB.
  • PE3-A receives the broadcast packet from PE2-A.
  • PE3-A detects that the broadcast packet is received from the central PW and does not forward the broadcast packet to another central PW.
  • PE1-AB receives the broadcast packet sent by PE2-A.
  • PE1-AB detects that the broadcast packet has the domain ID attribute and the domain PW with ID is received.
  • a domain PW of A sends a broadcast packet, and PE1-AB sends a broadcast packet to the other two domain PWs with the domain ID attribute and the ID B. That is, PE1-AB sends the broadcast packet to PE2-B and PE3-B. .
  • PE2-B receives the broadcast packet sent by the PE1-AB.
  • the PE2-B detects that the broadcast packet is received from the central PW and does not forward the broadcast packet to another central PW.
  • PE3-B receives the broadcast packet from PE1-AB.
  • PE3-B detects that the broadcast packet is received from the central PW and does not forward broadcast packets to another central PW.
  • FIG. 9 is a schematic diagram of a VPLS service hierarchical non-protected networking including two inter-domain PEs in multiple VPLS domains.
  • FIG. 9 has two VPLS domains, domain A and domain B.
  • the central PW is configured on other edge devices except the edge devices PE1-AB and PE2-AB in the domain A and the domain B;
  • the center PW is configured on the edge device PE3-B except the edge devices PE1-AB and PE2-AB in the domain A and the domain B;
  • the domain PWs connected to other edge devices in the domain A are configured on the edge devices PE1-AB and PE2-AB in the domain A and the domain B, and the domain ID is A for the domain PWs;
  • the domain PWs connected to other edge devices in the domain B are configured, and the domain ID is B for these PWs.
  • the domain PWs connecting PE1-AB and PE2-AB are assigned domain IDs A and B.
  • FIG. 10 is a schematic diagram of broadcast packet forwarding in a VPLS service hierarchical networking including two inter-domain PEs in multiple VPLS domains.
  • the short-grained dotted line indicates a broadcast packet sent by a CE device CE1-A in domain A, the forwarding path in the VPLS network;
  • the long-grained dotted line indicates a CE device CE1- in domain B.
  • the forwarding process is as follows.
  • PE4-A After receiving the broadcast packet sent by the client-side edge device CE1-A, PE4-A finds that the packet is received from the AC and sends the broadcast packet to all PWs. The broadcast packet is sent to PE3-A and PE1-AB. ;
  • PE3-A After receiving the broadcast packet sent by PE4-A, PE3-A finds that the packet is received from the central PW and is not forwarded to another central PW.
  • the PE1-AB receives the broadcast packet from the PE4-A and finds that the packet is received from the domain PW with the domain ID attribute and the ID is A.
  • the broadcast is not sent to the domain PW with the domain ID attributes A and B.
  • a packet is sent to the domain PW whose domain ID is B, and is sent to PE3-B.
  • PE3-B After receiving the broadcast packet from the PE1-AB, PE3-B finds that the packet is received from the central PW and is not forwarded to another PW. The AC forwards the broadcast packet to CE1-B.
  • the forwarding path of broadcast packets sent by the CE1-B device is described as follows.
  • PE3-B After receiving the broadcast packet sent by the CE1-B device on the client-side edge device, PE3-B finds that the packet is received from the AC and sends the broadcast packet to all PWs. The broadcast packet is sent to PE1-AB and PE2 respectively. -AB.
  • the PE1-AB receives the broadcast packet sent by the PE3-B.
  • the packet is received from the PW with the domain ID attribute and the ID is B.
  • the broadcast packet is not sent to the domain PW whose domain ID attributes are A and B. If the broadcast packet is sent to the domain PW whose domain ID is A, it is sent to PE4-A.
  • the PE2-AB receives the broadcast packet from the PE3-B and finds that the packet is received from the domain PW with the domain ID attribute and the ID B.
  • the broadcast is not sent to the domain PW with the domain ID attributes A and B.
  • the packet is sent to the PE3-A in the domain PW whose domain ID is A.
  • PE3-A After receiving the broadcast packet from PE2-AB, PE3-A finds that the packet is received from the central PW and is not forwarded to another central PW.
  • PE4-A After receiving the broadcast packet from PE1-AB, PE4-A finds that the packet is received from the central PW and is forwarded to the other PW. The broadcast packet is forwarded to CE1-A through the AC.
  • This embodiment can support one or more inter-AS edge devices in different VPLS broadcast domains, optimize the deployment plan of the VPLS network, and save the number of network devices.
  • the embodiment further provides a computer readable storage medium storing computer executable instructions arranged to perform the method of any of the above embodiments.
  • a cross-domain edge device, a layered VPLS network, and a broadcast traffic processing method can ensure that a device in each VPLS domain receives only one broadcast traffic, and multiple VPLSs overlapping on at least one border PE can be divided in the VPLS network.
  • the domain implements the division of multiple horizontal VPLS domains in the VPLS network.

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Abstract

一种跨域边缘设备、分层VPLS网络及广播流量的处理方法，同时位于第一VPLS域和第二VPLS域的跨域边缘设备在第一VPLS域中对与其连接的边缘设备配置含第一域标识的域伪线，在第二VPLS域中针对与其连接的边缘设备配置含第二域标识的域伪线；所述跨域边缘设备从所述含第一域标识的域伪线上接收到广播流量时，所述跨域边缘设备通过不含第一域标识的域伪线发送所述广播流量；以及所述跨域边缘设备从所述含第二域标识的域伪线上接收到广播流量时，所述跨域边缘设备通过不含第二域标识的域伪线发送所述广播流量，分层虚拟专用局域网业务VPLS网络包括所述第一VPLS域和所述第二VPLS域。

Description

跨域边缘设备、分层VPLS网络及其广播流量的处理方法 技术领域
本公开涉及通信领域，例如涉及一种跨域边缘设备、分层虚拟专用局域网业务VPLS网络及其广播流量的处理方法。
背景技术
RFC4762(Virtual Private LAN Service(VPLS)Using Label Distribution Protocol(LDP)Signaling)中定义了一种分层虚拟专用局域网业务(Virtual Private LAN Service，VPLS)(H-VPLS)解决方案。参见图1，该图所示为基于RFC4762的层次化VPLS的网络示意图，要连接两个全连接的VPLS域(以下简称VPLS域)，需要通过VPLS域在两个边界边缘设备(Provider Edge，PE)之间建立接入(spoke)类型的伪线(Pseudo Wire，PW)，接入类型的伪线简称接入伪线。其中，全连接的VPLS域中，PE之间均通过伪线连接。
图1中，PE1-A、PE2-A、PE3-A构成一个VPLS域A(也即广播域A)，PE1-B、PE2-B、PE3-B构成一个VPLS域B(也即广播域B)，在VPLS域A和VPLS域B内，建立的都是中心(hub)类型的PW(简称中心伪线)，PE1-A和PE1-B是边界PE，他们之间建立一个接入类型的PW，连接VPLS域A和VPLS域B。从接入伪线收到的广播报文，可以往所有的中心伪线(hub PW)发送，但是从中心伪线收到的广播报文，不再往其他中心伪线广播，这样保证每个PE只收到一份广播报文。以上VPLS域划分方案中，限于相关的VPLS方案中只能有一个中心域的限制，进行VPLS域划分时，划分出的两个VPLS域不能在一个边界PE上重叠，也即不能实现在VPLS网络中划分多个水平VPLS域。
发明内容
本公开提供了一种跨域边缘设备、分层VPLS网络及其广播流量的处理方法，能够避免在VPLS网络中进行VPLS域划分时，划分出的两个VPLS域不能在一个边界PE上重叠的现象。
一种广播流量的处理方法，包括：
同时位于分层虚拟专用局域网业务VPLS网络中的第一VPLS域和第二 VPLS域的跨域边缘设备在第一VPLS域中对与其连接的边缘设备配置含第一域标识的域伪线，以及在第二VPLS域中对与其连接的边缘设备配置含第二域标识的域伪线；以及
所述跨域边缘设备从所述含第一域标识的域伪线上接收到广播流量时，所述跨域边缘设备通过不含第一域标识的域伪线发送所述广播流量；以及
所述跨域边缘设备从所述含第二域标识的域伪线上接收到广播流量时，所述跨域边缘设备通过不含第二域标识的域伪线发送所述广播流量。
可选的，当与所述跨域边缘设备连接的边缘设备同时位于所述第一VPLS域和所述第二VPLS域时，所述跨域边缘设备针对与其连接的边缘设备配置含所述第一域标识和所述第二域标识的域伪线。
可选的，所述方法包括，所述第一VPLS域和所述第二VPLS域中的其他边缘设备分别对与其连接的边缘设备配置中心伪线，且通过中心伪线收到广播流量时，不通过域伪线以及其他中心伪线发送该广播流量。
可选的，所述方法还包括：
所述跨域边缘设备通过接入伪线收到广播流量时，通过除该接入伪线的其他所有伪线发送所述广播流量，且该跨域边缘设备具有接入电路时，向所述接入电路发送所述广播流量；其中，
所述分层VPLS域包括第三VPLS域，以及所述第三VPLS域通过所述接入伪线与至少一个所述跨域边缘设备连接。
可选的，所述方法还包括，所述跨域边缘设备从一域伪线收到广播流量时，通过所述接入伪线发送该广播流量，且该跨域边缘设备具有接入电路时，向所述接入电路发送该广播流量。
一种跨域边缘设备，包括：
配置模块，设置为在第一VPLS域中针对与所述跨域边缘设备连接的边缘设备配置含第一域标识的域伪线，以及在第二VPLS域中针对与所述跨域边缘设备连接的边缘设备配置含第二域标识的域伪线；以及
转发控制模块，设置为在从含第一域标识的域伪线收到广播流量时，通过不含所述第一域标识的域伪线发送该广播流量，以及在从含第二域标识的域伪线收到广播流量时，通过不含所述第二域标识的域伪线发送该广播流量；其中，
所述跨域边缘设备同时位于分层VPLS网络中的所述第一VPLS域和所述第二VPLS域。
可选的，所述配置模块还设置为当与所述跨域边缘设备连接的边缘设备同时位于所述第一VPLS域和第二VPLS域时，针对与所述跨域边缘设备连接的其他边缘设备配置含所述第一域标识的域伪线和含所述第二域标识的域伪线。
可选的，所述转发控制模块还设置为在所述跨域边缘设备通过接入伪线与第三VPLS域连接、且通过该接入伪线收到广播流量时，通过除所述接入伪线的其他所有伪线发送该广播流量，且在该跨域边缘设备具有接入电路时，向所述接入电路发送该广播流量，其中，所述分层VPLS域包括所述第三VPLS域。
可选的，所述转发控制模块还设置为从一域伪线收到广播流量时，通过所述接入伪线发送该广播流量，且该跨域边缘设备具有接入电路时，向所述接入电路发送该广播流量。
一种分层VPLS网络，包含第一VPLS域和第二VPLS域，其中，至少在一个跨域边缘设备同时位于所述第一VPLS域和第二VPLS域；
所述跨域边缘设备设置为在第一VPLS域中针对与其连接的边缘设备配置含第一域标识的域伪线，在第二VPLS域中针对与其连接的边缘设备配置含第二域标识的域伪线；以及
所述跨域边缘设备还设置为从含第一域标识的域伪线收到广播流量时，通过不含第一域标识的域伪线发送该广播流量，从所述含第二域标识的域伪线上接收到广播流量时，所述跨域边缘设备通过不含第二域标识的域伪线发送所述广播流量。
一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令设置为执行上述任一项的方法。
在分层VPLS网络中划分第一VPLS域和第二VPLS域，划分的第一VPLS域和第二VPLS域至少在一个跨域边缘设备上重叠，也即跨域边缘设备同时位于第一VPLS域和第二VPLS域。其中，跨域边缘设备在第一VPLS域中针对与其连接的边缘设备配置含第一域标识的域伪线，在第二VPLS域中针对与其连接的边缘设备配置含第二域标识的域伪线，基于该伪线配置，跨域边缘设备从某一域伪线收到广播流量时，将该广播流量向域标识不包含该域伪线之域标识 的其他域伪线发送，从而保证每个VPLS域内的设备只收到一份广播流量。本发明实施例提供的方案可以在VPLS网络中划分出在至少一个边界PE上重叠的多个VPLS域，也即实现了在VPLS网络中划分多个水平VPLS域。可以优化VPLS网络的部署方案，节约网络设备数，降低VPLS网络部署的成本。
附图说明
图1为一种基于RFC4762的层次化VPLS业务的组网示意图；
图2为第一实施例提供的分层VPLS网络中广播流量的处理方法流程示意图；
图3为第二实施例提供的跨域PE结构示意图；
图4为第三实施例提供的跨域PE结构示意图；
图5为第四实施例提供的分层VPLS网络结构示意图；
图6为图5中分层VPLS网络的结构示意图一；
图7为图6中组网环境中部署VPLS业务的流程示意图；
图8为图7中广播报文转发示意图；
图9为图5中分层VPLS网络的结构示意图二；以及
图10为图9中广播报文转发示意图。
具体实施方式
下面将结合实施例中的附图，对实施例中的技术方案进行清楚、完整地描述，所描述的实施例只是一部分实施例，而不是全部的实施例。在不冲突的情况下，以下实施例以及实施例中的技术特征可以相互任意组合。
实施例一
参见图2，本实施例提供的分层VPLS网络的广播流量的处理方法包括以下步骤。
在步骤210中，在分层VPLS网络中划分第一VPLS域和第二VPLS域，第一VPLS域和第二VPLS域至少在一个跨域PE上重叠。
本实施例中的跨域PE可以是该PE同时位于至少两个VPLS域，本实施例中 的跨域PE可以是被2个VPLS域共占的PE，还可以是被3个或3个以上的VPLS域共占的PE。本实施例中的一个VPLS域可以是一个全连接的VPLS域，即一个广播域。
在步骤220中，跨域PE在第一VPLS域中针对与跨域PE连接的PE配置含第一域标识的域PW，在第二VPLS域中针对与跨域边缘设备连接的PE配置含第二域标识的域PW。
步骤220中，对于一个跨域PE，对与该跨域PE处于一个VPLS域中的PW配置域标识，也即在跨域PE内部配置含域标识的域PW。该跨域PE在第一VPLS域中的第一域标识与该跨域PE在第二VPLS域中的第二域标识不同。
本实施例中跨域PE中每个VPLS域中的域标识可以由管理员输入配置，且可配置为仅在被配置的设备上生效，以控制广播流量的转发，且不参与边缘到边缘的伪线仿真(Pseudo-Wire Emulation Edge to Edge，PWE3)协议协商。
本实施例中的跨域PE可以同时位于两个VPLS域，也可以同时位于三个或三个以上的VPLS域。当一个域PW在多个VPLS域时，可以为该域PW配置多个域标识。
在步骤230中，基于上述组网和配置，当跨域PE从所述含第一域标识的域PW收到广播流量时，跨域PE通过不含第一域标识的域伪线发送该广播流量，所述跨域边缘设备从所述含第二域标识的域伪线上接收到广播流量时，所述跨域边缘设备通过不含第二域标识的域伪线发送所述广播流量。例如，跨域PE通过不含第一域标识的域伪线发送该广播流量，可以包括通过域标识与第一域标识不同的其他域PW发送广播流量，以及通过域标识不包含第一域标识的其他域PW发送，例如：当两个域PW中的每一个域伪线配置有多个域标识时，二者包含的域标识中有至少一个相同的域标识时，则跨域PE从其中一个域PW收到的广播流量后，不再将广播流量往另外一个域PW转发。可以保证每个VPLS域中的设备只收到一份广播流量，实现在VPLS网络中划分多个水平VPLS域。
本实施例中，当第一VPLS域和第二VPLS域在至少两个跨域PE上重叠时，每个跨域PE针对与其连接的跨域PE配置含第一域标识的域伪线和含第二域标识的域PW。例如，跨域边缘设备PE1和跨域边缘设备PE2同时位于第一VPLS域和第二VPLS域，则PE1上的域PW的域标识配置为第一域标识和第二域标识，PE2上的域PW的域标识也配置为第一域标识和第二域标识。
在本实施例中，分别对与第一VPLS域和第二VPLS域中除跨域PE外的其他PE连接的PE配置中心PW(HUB PW)，且PE通过中心PW收到广播流量时，PE可以不向域PW以及其他中心PW发送该广播流量，PE可以通过所有接入伪线(spoke PW)和接入电路(Access Circuit，AC)发送该广播流量。
本实施例中，跨域PE除了同时位于多个VPLS域时，跨域PE还可以通过连接PW与其他VPLS域中的PE连接。例如，分层VPLS网络还可以被划分出第三VPLS域，跨域PE通过连接PW与第三VPLS域的其中一个PE连接。跨域PE通过连接PW收到广播流量时，可以通过其他所有PW(包括但不限于域PW和中心PW)发送该广播流，且该跨域PE具有接入电路(AC)时，还可以向接入电路发送该广播流量。
本实施例中，跨域PE从一域PW收到广播流量时，除通过不含第一域标识的域伪线和不含第二域标识的伪线发送该广播流量之外，还可以通过连接PW发送该广播流量向，且该跨域PE包括接入电路(AC)时，还可以通过接入电路发送该广播流量向。
综上，在本实施例中，广播流量的转发控制包括但不限于以下规则：
当一个PW收到一份广播报文(广播流量的一部分)时，PE可以根据该PW的类型，做不同的转发处理。通过上述配置，本实施例中的PW包括以下3种类型：中心PW，连接PW以及带有域标识的域PW。
如果一PW是中心PW，PE可以不再将从该中心PW接收的广播报文往其他中心PW以及有域标识的域PW转发，但是可以往所有连接PW和AC发送一份该广播报文。
如果一PW是连接PW，PE可以将从该连接PW接收的广播报文往所有的其他PW(包括但不限于域PW和中心PW)以及AC发送一份该广播报文。
如果一PW是有域标识ID1的域PW，PE可以不再将从该域PW接收的广播报文往包含域标识ID1的域PW和中心PW转发，但是可以往连接PW、AC以及其他不包含域标识ID1的域PW转发。当两个域PW中每个域PW配置有多个域标识时，如果两个域PW包含同一个域标识，则PE从其中一个域PW收到广播报文后，可以不再往另外一个域PW转发该广播报文。
实施例二
参见图3，本实施例提供了一种跨域PE，所述跨域PE可以同时位于分层VPLS网络中的第一VPLS域和第二VPLS域。所述跨域PE包括：配置模块31和转发控制模块32。
配置模块31设置为在第一VPLS域中针对与跨域PE连接的PE配置含第一域标识的域PW，在第二VPLS域中针对与跨域PE连接的PE配置含第二域标识的域伪线。配置模块31对与该跨域PE处于一个VPLS域中的PW配置域标识，也即配置域伪线。对于该跨域PE，第一VPLS域中的域标识与第二VPLS域中的域标识不同。
本实施例中的跨域PE可以是同时位于至少两个VPLS域中的PE。本实施例中的一个VPLS域可以是一个全连接的VPLS域，即一个广播域。本实施例中跨域PE上每个域PW的域标识可以由管理员通过配置模块31输入配置，且可配置为仅在被配置的设备上生效，以控制广播流量的转发。
本实施例中的跨域PE可以同时位于两个VPLS域，也可以同时位于三个或三个以上的VPLS域。当一个域PW位于多个VPLS域时，配置模块31可以为该域伪线配置多个域标识。
转发控制模块32设置为在从含第一域标识的域PW收到广播流量时，通过不含所述第一域标识的域伪线发送该广播流量，以及在从含第二域标识的域伪线收到广播流量时，通过不含所述第二域标识的域伪线发送该广播流量，例如：当两个域PW中的每个域PW配置有多个域标识时，二者包含的域标识中有至少一个相同的域标识的，则跨域PE从其中一个域PW收到广播流量后可以不再往另外一个域PW转发广播流量，可以保证每个VPLS域中的PE只收到一份广播流量，实现在VPLS网络中划分多个水平VPLS域。
配置模块31还可以设置为多个跨域边缘设备同时位于第一VPLS域和第二VPLS域时，针对与跨域PE连接的其他跨域PE配置含第一域标识的域PW和含第二域标识的域PW。
转发控制模块32还可以设置为在跨域PE通过连接PW与第三VPLS域连接、通过该连接PW收到广播流量时，通过其他所有PW(包括但不限于域PW和中心PW)发送该广播流，且在该跨域PE具有接入电路时，可以向接入电路发送该广播流量。
转发控制模块32还可以设置为通过连接PW发送该广播流量，且该跨域PE 具有接入电路(AC)时，还可以向接入电路发送该广播流量。
上述实施例的模块或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，例如上述配置模块31和转发控制模块32可以集中内置在跨域PE的处理器中，也可以独立于跨域PE的处理器之外单独设置，或者分布在多个计算装置所组成的网络上。可选地，配置模块31和转发控制模块32可以用计算装置可执行的程序代码来实现，可以将配置模块31和转发控制模块32可以存储在非暂态存储介质(只读存储器(Read-Only Memory，ROM)或随机存取存储器(Random Access Memory，RAM)、磁碟、光盘)中由计算装置来执行，并且在一些情况下，可以以不同于上述实施例中的顺序执行所示出或描述的步骤，或者将上述实施例的模块分别制作成多个集成电路模块，或者将上述实施例中的多个模块或步骤制作成单个集成电路模块来实现。
实施例三
请参见图4，本实施提供了一种跨域边缘设备，该跨域边缘设备可以同时位于分层VPLS网络中的第一VPLS域和第二VPLS域，跨域边缘设备包括处理器41和存储器42。处理器41设置为执行存储器42中的模块，模块执行以下过程：
在第一VPLS域中针对与跨域PE连接的PE配置含第一域标识的域伪线，在第二VPLS域中针对与跨域PE连接的边缘设备配置含第二域标识的域伪线；以及
在从含第一域标识的域伪线收到广播流量时，通过不含第一域标识的域伪线发送该广播流量，从所述含第二域标识的域伪线上接收到广播流量时，所述跨域边缘设备通过不含第二域标识的域伪线发送所述广播流。
实施例四
请参见图5，本实施例提供了一种分层VPLS网络，包含第一VPLS域(以下简称域A)和第二VPLS域(以下简称域B)，至少在一个跨域边缘设备同时位于第一VPLS域和第二VPLS域。
跨域PE设置为在广播域A中针对与其连接的PE配置含第一域标识(以下用域ID(identification)A表示)的域PW，在第二VPLS域中针对与其连接的PE配置含第二域标识(以下用域ID B表示)的域PW。
跨域PE还可以设置为从含第一域标识的域伪线收到广播流量时，通过不含 第一域标识的域伪线发送该广播流量，从所述含第二域标识的域伪线上接收到广播流量时，所述跨域边缘设备通过不含第二域标识的域伪线发送所述广播流量。下面通过广播域A和广播域B的几种组网结构，对广播流量的处理方法进行示例说明。
图6示出了一个跨域PE设备同时位于两个VPLS域中的VPLS业务层次化组网示意图。图6中有两个VPLS域，域A和域B。域A中有3个边缘设备：PE1-AB、PE2-A和PE3-A；域B中有3个边缘设备：PE1-AB、PE2-B和PE3-B；其中PE1-AB同时位于域A和域B。
在组网环境中部署VPLS业务的过程参见图7。
在步骤710，在域A中，除PE1-AB外的其他边缘设备上，配置中心PW。
在步骤720，在域B中，除PE1-AB外的其他边缘设备上，配置中心PW。
在步骤730，在PE1-AB上，配置和域A中其他边缘设备连接的域PW，且对于这些域PW指定域ID为A。
在步骤740，在PE1-AB上，配置和域B中其他边缘设备连接的域PW，且对于这些域PW指定域ID为B。
基于上述配置，对于广播报文的转发过程如下：
当一PW是中心PW，PE可以不再将从该中心PW接收的广播流量往其他中心PW以及有域标识的域PW转发，但是可以往所有连接PW和AC发送一份该广播流量；
当一PW是连接PW时，PE可以将从该连接PW接收的广播报文往所有的其他PW(包括但不限于域PW和中心PW)以及AC发送一份该广播流量；以及
当一PW是有域标识ID1的域PW时，PE可以不再将从该域PW接收的广播报文往包含相同域标识ID1的域PW和中心PW转发，但是可以往连接PW、AC以及其他不包含域标识ID1的域PW转发，当两个域PW中每个域PW配置有多个域标识时，如果两个域PW包含同一个域标识，则PE从其中一个域PW收到的广播报文后，可以不往另外一个域PW转发该广播流量。
图8在图6基础上示出了包括同时位于多个VPLS域中的一个跨域PE的VPLS业务层次化组网中广播报文转发示意图，图8中，虚线表示域A中一个客 户侧边缘设备(Customer Edge，CE)CE1发送的一份广播报文，在VPLS组网中，广播报文的转发过程如下。
PE2-A收到CE1发送的广播报文，PE2-A检测到广播报文是从AC上接收到的，将广播报文往所有PW发送，即将广播报文分别发往PE3-A和PE1-AB。
PE3-A收到PE2-A发送的广播报文，PE3-A检测到广播报文是从中心PW接收到的，不再往另外一个中心PW转发广播报文。
PE1-AB收到PE2-A发送的广播报文，PE1-AB检测到广播报文带有域ID属性且ID为A的域PW收到的，不再往另外一个有域ID属性且ID为A的域PW发送广播报文，PE1-AB只往另外两个有域ID属性且ID为B的域PW发送广播报文，即PE1-AB将广播报文发往PE2-B和PE3-B。
PE2-B收到PE1-AB发送的广播报文，PE2-B检测到广播报文是从中心PW接收到的，不再往另外一个中心PW转发广播报文；以及
PE3-B收到PE1-AB发送的广播报文，PE3-B检测到广播报文是从中心PW接收到，不再往另外一个中心PW转发广播报文。
图9为本实施例的包括位于多个VPLS域的两个跨域PE设备的VPLS业务层次化非保护型组网示意图，图9中有两个VPLS域，域A和域B。域A中有4个边缘设备：PE1-AB、PE2-AB、PE3-A和PE4-A；域B中有3个边缘设备：PE1-AB、PE2-AB和PE3-B；其中PE1-AB和PE2-AB是同时位于域A和域B中的跨域PE。
在组网环境中部署VPLS业务的过程如下：
在域A中，在除同时位于域A和域B中的边缘设备PE1-AB和PE2-AB外的其他边缘设备上，配置中心PW；
在域B中，在除同时位于域A和域B中的边缘设备PE1-AB和PE2-AB外的边缘设备PE3-B上，配置中心PW；
在同时位于域A和域B中的边缘设备PE1-AB和PE2-AB上，配置和域A中其他边缘设备连接的域PW，且对于这些域PW指定域ID为A；以及
在同时位于域A和域B中的边缘设备PE1-AB和PE2-AB上，配置和域B中其他边缘设备连接的域PW，且对于这些PW指定域ID为B。
连接PE1-AB和PE2-AB的域PW被指定了域ID为A和B。
图10在图9基础上示出了包括同时位于多个VPLS域中的两个跨域PE的VPLS业务层次化组网中广播报文转发示意图。图10中，短粒度的虚线指明了域A中一个CE设备CE1-A发送的一份广播报文，在VPLS组网中的转发路径；长粒度的虚线指明了域B中一个CE设备CE1-B发送的一份广播报文，在VPLS组网中的转发路径。转发过程如下。
PE4-A收到客户侧边缘设备CE1-A发送的广播报文，发现报文是从AC上接收到，将广播报文往所有PW发送，即将广播报文发往PE3-A以及PE1-AB；
PE3-A收到PE4-A发送的广播报文，发现报文是从中心PW接收到，不再往另外一个中心PW转发；
PE1-AB收到PE4-A发送的广播报文，发现报文是从带有域ID属性且ID为A的域PW收到的，不再往域ID属性为A和B的域PW发送广播报文，只往域ID属性为B的域PW发送广播报文，即发往PE3-B；以及
PE3-B收到PE1-AB设备发送的广播报文，发现报文是从中心PW接收到，不再往另外一个中心PW转发；通过AC将广播报文转发给CE1-B。
CE1-B设备发送的广播报文的转发路径说明如下。
PE3-B收到客户侧边缘设备CE1-B设备发送的广播报文，发现报文是从AC上接收到，将广播报文往所有PW发送，即将广播报文分别发往PE1-AB和PE2-AB。
PE1-AB收到PE3-B发送的广播报文，发现报文是从带有域ID属性且ID为B的PW收到的，不再往域ID属性为A和B的域PW发送广播报文，往域ID属性为A的域PW发送广播报文，即发往PE4-A。
PE2-AB收到PE3-B发送的广播报文，发现报文是从带有域ID属性且ID为B的域PW收到的，不再往域ID属性为A和B的域PW发送广播报文，往域ID属性为A的域PW发送广播报文，即发往PE3-A。
PE3-A收到PE2-AB发送的广播报文，发现报文是从中心PW接收到，不再往另外一个中心PW转发。
PE4-A收到PE1-AB发送的广播报文，发现报文是从中心PW接收到，不再往另外一个中心PW转发，通过AC将广播报文转发给CE1-A。
本实施例可以支持一个或多个跨域边缘设备位于不同的VPLS广播域，优化了VPLS网络的部署方案，节约网络设备数。
本实施例还提供了一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令设置为执行上述任一实施例中的方法。
工业实用性
跨域边缘设备、分层VPLS网络及广播流量的处理方法，能够保证每个VPLS域内的设备只收到一份广播流量，可以在VPLS网络中划分出在至少一个边界PE上重叠的多个VPLS域，实现了在VPLS网络中划分多个水平VPLS域。

Claims (11)

  1. 一种广播流量的处理方法，包括：
    同时位于分层虚拟专用局域网业务VPLS网络中的第一VPLS域和第二VPLS域的跨域边缘设备在第一VPLS域中对与其连接的边缘设备配置含第一域标识的域伪线，以及在第二VPLS域中对与其连接的边缘设备配置含第二域标识的域伪线；
    所述跨域边缘设备从所述含第一域标识的域伪线上接收到广播流量时，所述跨域边缘设备通过不含第一域标识的域伪线发送所述广播流量；以及
    所述跨域边缘设备从所述含第二域标识的域伪线上接收到广播流量时，所述跨域边缘设备通过不含第二域标识的域伪线发送所述广播流量。
  2. 如权利要求1所述的方法，其中，当与所述跨域边缘设备连接的边缘设备同时位于所述第一VPLS域和所述第二VPLS域时，所述跨域边缘设备针对与其连接的边缘设备配置含所述第一域标识和所述第二域标识的域伪线。
  3. 如权利要求1或2所述的方法，包括，所述第一VPLS域和所述第二VPLS域中的其他边缘设备分别对与其连接的边缘设备配置中心伪线，且通过中心伪线收到广播流量时，不通过域伪线以及其他中心伪线发送该广播流量。
  4. 如权利要求1或2所述的方法，还包括：
    所述跨域边缘设备通过接入伪线收到广播流量时，通过除该接入伪线的其他所有伪线发送所述广播流量，且该跨域边缘设备具有接入电路时，向所述接入电路发送所述广播流量；其中，
    所述分层VPLS域包括第三VPLS域，以及所述第三VPLS域通过所述接入伪线与至少一个所述跨域边缘设备连接。
  5. 如权利要求4所述的方法，还包括，所述跨域边缘设备从一域伪线收到广播流量时，通过所述接入伪线发送该广播流量，且该跨域边缘设备具有接入 电路时，向所述接入电路发送该广播流量。
  6. 一种跨域边缘设备，包括：
    配置模块，设置为在第一VPLS域中针对与所述跨域边缘设备连接的边缘设备配置含第一域标识的域伪线，以及在第二VPLS域中针对与所述跨域边缘设备连接的边缘设备配置含第二域标识的域伪线；以及
    转发控制模块，设置为在从含第一域标识的域伪线收到广播流量时，通过不含所述第一域标识的域伪线发送该广播流量，以及在从含第二域标识的域伪线收到广播流量时，通过不含所述第二域标识的域伪线发送该广播流量；其中，
    所述跨域边缘设备同时位于分层VPLS网络中的所述第一VPLS域和所述第二VPLS域。
  7. 如权利要求6所述的设备，其中，所述配置模块还设置为当与所述跨域边缘设备连接的边缘设备同时位于所述第一VPLS域和第二VPLS域时，针对与所述跨域边缘设备连接的其他边缘设备配置含所述第一域标识的域伪线和含所述第二域标识的域伪线。
  8. 如权利要求6或7所述的设备，其中，所述转发控制模块还设置为在所述跨域边缘设备通过接入伪线与第三VPLS域连接、且通过该接入伪线收到广播流量时，通过除所述接入伪线的其他所有伪线发送该广播流量，且在该跨域边缘设备具有接入电路时，向所述接入电路发送该广播流量，其中，所述分层VPLS域包括所述第三VPLS域。
  9. 如权利要求8所述的设备，其中，所述转发控制模块还设置为从一域伪线收到广播流量时，通过所述接入伪线发送该广播流量，且该跨域边缘设备具有接入电路时，向所述接入电路发送该广播流量。
  10. 一种分层VPLS网络，包含第一VPLS域和第二VPLS域，其中，至少 在一个跨域边缘设备同时位于所述第一VPLS域和第二VPLS域；
    所述跨域边缘设备设置为在第一VPLS域中针对与其连接的边缘设备配置含第一域标识的域伪线，在第二VPLS域中针对与其连接的边缘设备配置含第二域标识的域伪线；以及
    所述跨域边缘设备还设置为从含第一域标识的域伪线收到广播流量时，通过不含第一域标识的域伪线发送该广播流量，从所述含第二域标识的域伪线上接收到广播流量时，所述跨域边缘设备通过不含第二域标识的域伪线发送所述广播流量。
  11. 一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令设置为执行权利要求1-5中任一项的方法。
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