WO2012130109A1 - Procédé et système de transfert de service - Google Patents

Procédé et système de transfert de service Download PDF

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Publication number
WO2012130109A1
WO2012130109A1 PCT/CN2012/072977 CN2012072977W WO2012130109A1 WO 2012130109 A1 WO2012130109 A1 WO 2012130109A1 CN 2012072977 W CN2012072977 W CN 2012072977W WO 2012130109 A1 WO2012130109 A1 WO 2012130109A1
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WO
WIPO (PCT)
Prior art keywords
service
olt
ethernet
identifier
onu
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PCT/CN2012/072977
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English (en)
Chinese (zh)
Inventor
张奎
臧美燕
袁立权
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中兴通讯股份有限公司
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Publication of WO2012130109A1 publication Critical patent/WO2012130109A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0071—Provisions for the electrical-optical layer interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0077—Labelling aspects, e.g. multiprotocol label switching [MPLS], G-MPLS, MPAS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects

Definitions

  • the present invention relates to the field of communications, and in particular to a service forwarding method and system.
  • the Metro Ethernet Forum defines an Ethernet-based line service (E-Line), and an Ethernet-based LAN service (Ethernet LAN Service, referred to as E).
  • E-LAN Ethernet-based Ethernet Tree Service
  • E-Tree Ethernet-based Ethernet Tree Service
  • the E-line, E-LAN, and E-TREE services are established based on the User Network Interface (UNI). Each interface corresponds to the logical port of the corresponding physical port or physical port. Currently, it is in passive light.
  • the network (Passive Optical Network, PON for short) system as shown in Figure 5, the demand for implementing these service models is increasing.
  • the UNI interface is the physical port of the connected user of the ONU, which can be an Ethernet interface or The logical port of the Ethernet interface.
  • the ONU needs to support the models of these services.
  • the functions of the ONUs are more complicated and difficult to implement.
  • the ONU in the PON system supports a variety of E-LINE, E-LAN, and E-TREE service models, a large number of configurations are required, and the configuration management process is relatively cumbersome.
  • a service forwarding method including:
  • the ONU maps the received service to the logical channel of the PON through the Ethernet identifier and/or the UNI port identifier of the ONU, where the PON logical channel is a logical channel connecting the ONU and its corresponding OLT; the optical line terminal OLT
  • the mapping between the PON logical channel and the label protocol forwarding (MPLS) instance is established by the logical UNI port; the OLT forwards the service mapped to the PON logical channel through the MPLS instance; wherein the OLT is an optical access system Central office equipment, optical line termination in PON network, in DPoE (Docsis Provisioning of EPON, GPRS-based passive optical network)
  • the OLT in the network is a DPoE system.
  • the ONU maps the received service to the logical channel of the PON through the Ethernet identifier and/or the port identifier of the UNI of the ONU, including one of the following: the received service is multiple services, and multiple services and multiple services One-to-one correspondence of the Ethernet identifiers, mapping multiple services corresponding to multiple Ethernet identifiers to one P0N logical channel; receiving the service as multiple services, and multiple services corresponding to one Ethernet identifier, corresponding to one Ethernet identifier The multiple services are mapped to a P0N logical channel; each service in the received service corresponds to an Ethernet identifier or a port identifier of the NU of the ONU, and an Ethernet identifier corresponding to each service or a corresponding service of each service The port identifier of the UNI maps each service to its corresponding P0N logical channel.
  • the mapping between the logical channel and the MPLS instance is established by using the logical UNI port on the OLT.
  • the mapping between the Ethernet identifier and the P0N logical channel corresponding to the service and the Ethernet corresponding to the service are established by the logical UNI interface.
  • a VC is established between the UNI port of the ONU and the logical UNI port of the OLT to implement the mapping configuration of the ONU and the OLT.
  • the attributes of the VC include: the identifier of the UNI port of the 0NU, the identifier of the logical U port of the 0LT, and the VC.
  • the intermediate associated variables of the virtual connection include: an Ethernet identity and/or an identification of a PON logical channel.
  • the P0N logical channel is a logical link identification path (LLID) in the EP0N system
  • the P0N logical channel is a port (GEM P0RT) of the GP0N encapsulation method in the GP0N system.
  • the identifier of the UNI port of the 0NU includes: physical attributes of the UNI port of the 0NU, and the physical attributes include: a media access control MAC address and/or an Ethernet identifier.
  • the identifier of the logical UNI port of the 0LT includes: physical attributes of the logical UNI port of the 0LT, and the physical attributes include: a media access control MAC address and/or an Ethernet identifier.
  • the Ethernet identifier comprises: a virtual local area network VLAN or a VLAN + service type C0S.
  • the logical UNI port is a reference point, and the reference point is located at the connection between the access function module and the aggregation function module on the OLT, and the convergence function module refers to a functional module that implements MPLS aggregation and forwarding.
  • a service forwarding system comprising: an optical line terminal (0LT) and an optical network unit (0NU), the 0NU including a mapping module, configured to identify the received service by Ethernet and/or The port identifier of the user network interface UI of the ONU of the optical network unit is mapped to the logical channel of the PON of the passive optical network, where the PON logical channel is a logical channel connecting the ONU and its corresponding OLT;
  • the OLT includes: establishing a module and forwarding The module, the foregoing establishing module, is configured to establish a mapping relationship between the PON logical channel and the label protocol forwarding MPLS instance by using the logical UNI port; the forwarding module is configured to forward the service mapped to the PON logical channel by using the MPLS instance;
  • the OLT is a central office device of the optical
  • the mapping module is configured to map the received service to the logical channel of the passive optical network PON through the Ethernet identifier and/or the port identifier of the optical network unit ONU in one of the following manners:
  • the service, and the multiple services correspond to multiple Ethernet identifiers, and map multiple services corresponding to multiple Ethernet identifiers to one PON logical channel;
  • the received service is multiple services, and multiple services correspond to one Ethernet
  • the network identifier maps multiple services corresponding to one Ethernet identifier to one PON logical channel.
  • Each service in the received service corresponds to the Ethernet identifier or the port identifier of the UNI of the ONU, and the Ethernet corresponding to each service.
  • the port identifier of the UNI or the corresponding UNI of each service maps each service to its corresponding PON logical channel.
  • the first establishing module is configured to establish a mapping relationship between the Ethernet identifier corresponding to the service and the P0N logical channel and the mapping relationship between the Ethernet identifier corresponding to the service and the MPLS instance by using the logical UNI interface on the OLT.
  • the system further includes: a second establishing module, configured to establish a virtual connection between the UNI port of the ONU and the logical UNI port of the OLT to implement a mapping configuration of the ONU and the OLT, and the attributes of the VC include: The identity of the port, the identity of the logical II port of the 0LT, and the intermediate associated variable of the VC.
  • the received service is mapped to the logical channel of the passive optical network P0N through the Ethernet identifier and/or the port identifier of the user network interface UNI of the optical network unit ONU, wherein the PON logical channel is connected to the ONU.
  • the optical line terminal OLT establishes a mapping relationship between the PON logical channel and the label protocol to forward the MPLS instance through the logical UNI port; the OLT performs the service mapped to the PON logical channel through the MPLS instance. Forwarding, which solves the problem that the PON system ONU in the related art needs a large number of configurations in order to support multiple service models, and the configuration management process is relatively cumbersome, thereby achieving the effect of reducing the complexity and cost of the ONU.
  • FIG. 1 is a schematic diagram of an E-LINE service type according to the related art
  • FIG. 2 is a schematic diagram of an E-LAN service type according to the related art
  • FIG. 3 is a schematic diagram of an E-TREE service type according to the related art
  • 4 is a schematic diagram of an end-to-end service model implemented by an MPLS method according to the related art
  • FIG. 5 is a schematic diagram of a topology structure of a DPoE system according to the related art
  • FIG. 6 is a flowchart of a service forwarding method according to an embodiment of the present invention
  • 7 is an ELINE: EPL per SF multiple LLID according to an embodiment of the present invention
  • FIG. 8 is an ELINE: EVPL service implementation map (per EVC per SF multiple LLID) according to an embodiment of the present invention
  • 9 is an ELAN: EP-LAN service implementation map (per EVC per SF multiple LLID) according to an embodiment of the present invention
  • FIG. 10 is an ELAN: EVP-LAN service implementation map (per EVC per SF multiple according to an embodiment of the present invention) LLID);
  • FIG. 11 is an E-Tree: EP-Tree service implementation map (per EVC per SF multiple LLID) according to an embodiment of the present invention
  • FIG. 12 is an E-Tree: EVP-Tree service implementation according to an embodiment of the present invention
  • Mapping FIG. 13 is a schematic diagram of a service model after the OLT abstracts a logical UNI according to an embodiment of the present invention
  • FIG. 14 is a schematic diagram of an ELAN: EVP-LAN service implementation mapping according to an embodiment of the present invention ( Multiple EVC per SF per LLID)
  • 15 is a structural block diagram of a service forwarding system according to an embodiment of the present invention
  • FIG. 16 is a block diagram showing a preferred structure of a service forwarding system according to an embodiment of the present invention.
  • BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
  • FIG. 6 is a flowchart of a service forwarding method according to an embodiment of the present invention. As shown in FIG. 6, the method includes the following steps S602 to S606.
  • Step S602 The ONU maps the received service to the logical channel of the passive optical network PON through the Ethernet identifier and/or the port identifier of the user network interface UNI of the optical network unit (ONU), where the PON logical channel is connected to the ONU. And the logical channel between its corresponding OLT.
  • Step S604 The optical line terminal (OLT) establishes a mapping relationship between the PON logical channel and the label protocol to forward the MPLS instance by using the logical UNI port on the OLT.
  • the OLT is the central office device of the optical access system, and the optical circuit is the optical line in the PON network.
  • the terminal is a DPoE system in the DPoE network.
  • Step S606 The OLT forwards the service mapped to the PON logical channel through the MPLS instance.
  • the ONU maps the received service to the PON logical channel, and then the OLT forwards the service mapped to the PON logical channel through the MPLS by establishing a mapping relationship between the PON logical channel and the MPLS instance, and overcomes the related technology in the PON.
  • the system ONU needs a large number of configurations, so that the configuration management process is relatively cumbersome, thereby achieving the effect of reducing the complexity and cost of the ONU.
  • the ONU maps the received service to the logical channel of the PON through the Ethernet identifier and/or the port identifier of the UNI of the ONU, including one of the following: the received service is multiple services, and multiple services and multiple services One-to-one correspondence of the Ethernet identifiers, mapping multiple services corresponding to multiple Ethernet identifiers to one PON logical channel; receiving the service as multiple services, and multiple services corresponding to one Ethernet identifier, corresponding to one Ethernet identifier The multiple services are mapped to a PON logical channel; each service in the received service corresponds to the Ethernet identifier or the port identifier of the UNI of the ONU, and the Ethernet identifier corresponding to each service or the UNI corresponding to each service The port identifier maps each service to its corresponding PON logical channel.
  • the diversity of the ONU mapping the received traffic to the PON logical channel is achieved.
  • the OLT establishes a mapping relationship between the PON logical channel and the MPLS instance by using the logical UNI port on the OLT.
  • the OLT establishes a mapping relationship between the Ethernet identifier and the PON logical channel corresponding to the service and the Ethernet corresponding to the service through the logical UNI interface on the OLT.
  • the mapping between the PON logical channel and the MPLS instance is implemented by establishing two mapping relationships.
  • a virtual connection VC is established between the UNI port of the ONU and the logical UNI port of the OLT to implement the mapping configuration of the ONU and the OLT.
  • the attributes of the VC include: the identifier of the UNI port of the ONU, the identifier of the logical UNI port of the OLT, and The intermediate associated variable of VC.
  • the VC is set up on the OLT and the ONU, and the corresponding configuration is implemented, which reduces the complexity of the mapping configuration on both sides of the ONU and the OLT.
  • the intermediate associated variables of the virtual connection include: an identity of the Ethernet identity and/or a logical channel of the PON.
  • the use of existing parameters reduces the complexity of mapping between the ONU and the OLT.
  • the PON logical channel is a logical link identification path (LLID) in the EPON system, and the PON logical channel is a GPON-based encapsulation method port (GEM PORT) in the GPON system.
  • the flexibility of the service forwarding method is achieved.
  • the identifier of the UNI port of the ONU includes: a physical attribute of the UNI port of the ONU and an Ethernet identifier, and physical attributes include: a media access control MAC address.
  • the use of existing parameters reduces the complexity of mapping between the ONU and the OLT.
  • the identifier of the logical UNI port of the OLT includes: a physical attribute of the logical UNI port of the OLT and/or an Ethernet identifier, and the physical attributes include: a media access control MAC address.
  • the use of existing parameters reduces the complexity of mapping between the ONU and the OLT.
  • the Ethernet identifier comprises: a virtual local area network VLAN or a VLAN + service type COS.
  • the logical UNI port is a reference point, and the reference point is located at a connection between the access function module and the aggregation function module on the OLT, and the convergence function module refers to a function module for implementing MPLS aggregation and forwarding.
  • the models of the service include: Ethernet-based line service (E_Line), Ethernet-based LAN service (E_LAN), and Ethernet-based tree service (E_TREE).
  • Embodiment 1 This embodiment provides a service implementation method. The embodiment combines the foregoing embodiment and a preferred implementation manner thereof. The method includes the following steps: Step 1: Configure the logical UNI interface on the OLT and configure the service type. E-LINE, E-LAN, and E-TREEo Step 2: Establish a mapping relationship between the logical UNI interface of the OLT and the service bearer channel between the OLT and the ONU. Step 3: The ONU establishes a mapping relationship between the UNI interface on the user side and the UNI logical interface on the OLT. Preferably, the above logical UNI interface may use a VLAN or a MAC address as an identifier. a logic
  • the UNI interface can include one VLAN or MAC address, and can also include multiple VLANs or multiple MAC addresses.
  • the service bearer channel between the OLT/ONU includes: a GEM technology GEM PORT, an EPON technology LLID, or a VLAN+LLID, a VLAN+GEMPORT.
  • the specific mapping manner is as follows: Step 1: The CE is connected to the Ethernet port of the ONU user side, and specifies the Ethernet service mode to be carried. Port transparent transmission or port VLAN multiplexing).
  • Step 2 Configure an L2VPN instance on the OLT (configure according to the specific E-Line/E-LAN/E-Tree service type.
  • Step 3 The connection between the Ethernet port U on the ONU user side and the logical UNI port on the OLT side is configured and managed through an abstract virtual connection, and the specific mapping is performed.
  • Step 3 includes the following steps 3.1 and 3.2: Step 3.1: On the ONU The service to be carried, the local service processing is configured, and the mapping between the port/port VLAN to the service bearer path (VLAN, and/or LLID, and/or GEM Prot) between the ONU and the OLT is completed.
  • Step 3.2 Configure the mapping between the specified service bearer path (VLAN, LLID, and/or GEM Prot) between the ONU and the OLT to the internal VLAN path (native vlan path, which can be single-layer or double-layer vlan tag).
  • the internal VLAN path is associated with the specified MPLS L2VPN instance.
  • the establishment of the entire abstract virtual connection is completed, and the virtual connection is associated with the corresponding L2VPN service forwarding instance.
  • Step 4 The peer PE completes the corresponding L2VPN configuration. If the peer end is also a PON system, the establishment manner is the same as the above step 2-step 3. It should be noted that, through the above steps, the corresponding Ethernet service opening between the CEs is completed.
  • the foregoing step 3 can be configured for an abstract virtual connection (VC).
  • the configuration is as follows: Step a: Specify the identifier of the UNI port in the VC. One of them is the UNI port identifier of the ONU (which can be a VLAN or a MAC address), and the other is a logical UNI identifier on the OLT (which can be identified by a VLAN). Corresponding to the port/port VLAN in step 3.1 above and the internal VLAN path in step 3.2. Step b: Specify the intermediate association attribute in the VC, which can be a VLAN or a PON link identifier, such as LLID or GEMPORT.
  • step b is equivalent to completing the mapping between the port/port VLAN of the ONU and the service bearer path between the ONU and the OLT in step 3.1 and the service between the ONU and the OLT in step 3.2. Mapping of bearer paths and internal VLAN paths.
  • Step c Configure the association between the VC identifier and the L2VPN instance. In this embodiment, the configuration of the above three steps is simpler and easier to maintain on the management layer, and does not require complicated configuration of mapping each part of the connection.
  • an abstract virtual connection (VC)
  • a logical UNI port is configured on the OLT user side
  • a virtual connection is formed between the logical U interface and the U port on the ONU side
  • an L2VPN instance is created on the OLT.
  • the connection of the end PE, the mapping between the virtual connection and the L2VPN is established at the same time, and finally the end-to-end service connection is implemented.
  • the end-to-end service connection of the entire system level can be configured and managed more efficiently from the overall perspective.
  • the OLT acts as the PE, and the peer PE passes the static configuration or protocol, such as the Multi-Protocol Lable Switch (MPLS) label distribution protocol.
  • MPLS Multi-Protocol Lable Switch
  • LDP Label Distribution Protocol
  • the ONU and the OLT use an internal virtual mechanism to implement the data path between the bearer service and the L2VPN instance.
  • FIG. 7 is an ELINE: EPL service implementation map (per EVC per SF according to an embodiment of the present invention. Multiple LLID)
  • EPL Ethernet Private Line
  • P2P point-to-point
  • Step 1 Create a virtual connection VC between the UNI1 and the logical UNI port on the OLT.
  • the ID of the UNI port on both sides of the VC1 is the port ID of the UNI1 and native vlanl.
  • VC1 is of the P2P type.
  • Step 2 Configure the intermediate association attribute of VC1 as tls vlanl. For EPON, share the link LLID1.
  • Step 3 Configure a virtual private line instance (vlll) on the OLT.
  • Step 4 Configure VC1 and vlll associations.
  • Step 5 Configure Layer 3 interfaces and routes (dynamic or static routes) on the OLT, enable label distribution protocol learning, and establish LSPs.
  • Step 6 Configure the PW on the OLT, specify the peer as PE2, and associate it with vlll.
  • Step 7 The peer PE completes the corresponding L2VPN configuration. If the peer end is also a PON system, refer to steps 1 to 6 above for the establishment mode. It should be noted that the tls vlan in FIG.
  • steps 1 and 2 are equivalent to configuring the mapping relationship between UNI1 and tls vlanl on the ONU and mapping the tls vlanl to native vlanl on the OLT (specifying the conversion of tls vlanl to native vlanl);
  • Step 4 is equivalent to The native vlan1 is associated with the vlll.
  • Step 1 The UNI1 of the ONU receives the data flow from the CE (Customer Edge).
  • Step 2 According to the mapping relationship, the TLs vlanl is added to the service path between the ONU and the OLT, and sent to the OLT.
  • Step 3 After receiving the data, the OLT converts tls vlanl to native vlanl (native vlanl tag) according to the configured mapping rule and sends it to the vll instance.
  • Step 4 The vlll instance on the OLT receives the native vlan l data stream, extracts the payload, finds the corresponding PW, and completes the PW/LSP encapsulation and sends it to the peer PE2.
  • Step 5 The data stream is sent to the PE2 through the LSP.
  • Embodiment 3 This embodiment provides a service implementation method. This embodiment combines the above embodiments and preferred embodiments thereof.
  • FIG. 8 is an ELINE: EVPL service implementation map (per EVC per SF according to an embodiment of the present invention). Multiple LLID), as shown in FIG.
  • this embodiment describes an EVPL (Ethernet Virtual Private Line) service, which implements P2P service transmission on vlan1 to UNI3 on UNI1 and P2P service transmission on vlan2 to UNI4 on UNI1, and the method includes The following steps are performed: Step 1: Create two VC connections between UNI1 on the ONU and the logical UNI port on the OLT, namely VC1 and P2.
  • the two UM port identifiers of VC1 are vlanl and native vlanl, respectively.
  • the two UNI port identifiers of VC2 are vlan2 and native vlan2.
  • VC1 and VC2 are of the P2P type.
  • Step 2 Configure the intermediate association attributes of VC1 and VC2 as pon vlanl and pon vlan2 respectively.
  • VC1 and VC2 share LLID 1.
  • Step 3 Configure virtual private line instances vlll and vll2 on the OLT.
  • Step 4 Configure VC1 and vlll associations, and configure VC2 and vll2 associations.
  • Step 5 Configure Layer 3 interfaces and routes (dynamic or static routes) on the OLT, enable label distribution protocol learning, and establish LSPs.
  • Step 6 Configure PW1 on the OLT, specify the peer as PE2, and associate it with vlll.
  • Configure PW2 on the OLT specify the peer as PE3, and associate it with vll2.
  • Step 7 The peer PE2 and PE3 complete the corresponding L2VPN configuration. If the peer end is also a PON system, refer to steps 1 to 6 above for the establishment mode. It should be noted that the tls vlan in FIG. 8 can be replaced by an LLID or a GEM port. It should be noted that Steps 1 and 2 are equivalent to completing the following two configurations:
  • mapping between vlanl and pon vlanl on UNI1 is configured on the ONU. When data is forwarded, vlanl is not used as the payload and is stripped.
  • mapping between vlan2 and pon vlan2 on UNI1 is configured on the ONU. When data is forwarded, vlan2 is not used. The payload is stripped).
  • Step 4 is equivalent to configuring the native vlan1 association to vlll on the OLT; and configuring native vlan2 to lj vll2 on the OLT.
  • the data flow forwarding process includes the following steps: Step 1: The data stream received on the UNI1 of the ONU.
  • Step 2 If the data packet carries the vlan tag as vlanl, according to the mapping relationship, the vlanl is stripped and pon vlanl is added and sent to the OLT. If the data packet carries the vlan tag as vlan2, according to the mapping relationship, after vlan2 is stripped, pon vlan2 is added and sent to the OLT. Step 3: After receiving the pon vlanl data from the ONU, the OLT converts the pon vlanl to the native vlanl (native vlanl tag) and sends it to the vlll instance according to the configured mapping rule.
  • the configured mapping rule converts pon vlan2 to native vlan2 (marked native vlanl tag) and sends it to the vll2 instance.
  • Step 4 The vlll instance on the OLT receives the native vlan 1 data stream, extracts the payload, finds the corresponding PW1, and sends the PW/LSP encapsulation to the peer PE2.
  • the vll2 instance on the OLT receives the native vlan 2 data stream. After the PW/LSP is encapsulated, it is sent to the peer PE3.
  • Step 5 The data stream is sent to the PE2 through the LSP.
  • Embodiment 4 This embodiment provides a service implementation method. This embodiment combines the foregoing embodiments and preferred embodiments thereof.
  • FIG. 9 is an ELAN: EP-LAN service implementation map (per EVC per SF multiple according to an embodiment of the present invention). LLID), as shown in FIG.
  • this embodiment describes an EP-LAN (Ethernet Private LAN) service, which implements a port-level multipoint-to-multipoint (UNIP, UNI2, UNI3, and UNI4).
  • the method includes the following steps: Step 1: Create two VC connections between the UNI1, UNI2 and the logical UNI port of the OLT on the ONU, respectively VC1 and P2.
  • the two UNI ports of VCl are the port ID of UNI1 and native vlanl.
  • the two UNI port IDs of VC2 are the port ID of UNI2 and native vlan2.
  • VCl and VC2 are P2P types.
  • Step 2 Configure the intermediate association attributes of VC1 and VC2 as tls vlanl and tls vlan2, respectively.
  • Step 3 Configure the virtual switch instance vsil on the OLT.
  • Step 4 Configure VC1 and VC2 to be vsil associations.
  • Step 5 Configure Layer 3 interfaces and routes (dynamic or static routes) on the OLT, enable label distribution protocol learning, and establish LSPs.
  • Step 6 Configure PW1 on the OLT, specify the peer as PE2, and associate it with vsil.
  • Configure PW2 on the OLT specify the peer as PE3, and associate it with vsil.
  • Step 7 The peer PE2 and PE3 complete the corresponding L2VPN configuration. If the peer end is also a PON system, refer to steps 1 to 6 above for the establishment mode.
  • the tls vlan in Figure 9 can be replaced by LLID or GEM port.
  • Steps 1 and 2 are equivalent to completing the following two configurations:
  • mapping between UNI1 and tls vlan1 is configured on the ONU.
  • mapping between UNI2 and tls vlan2 is configured on the ONU.
  • Step 4 is equivalent to completing the following configuration: Configuring native vlanl to associate to vsil on the OLT; configuring native vlan2 to lj vsil on the OLT.
  • Step 1 The data stream received on the UNI1 of the ONU.
  • Step 2 According to the mapping relationship, the TLs vlanl is added to the service path between the ONU and the OLT, and sent to the OLT.
  • Step 3 After receiving the data, the OLT converts tls vlanl to native vlanl (native vlanl tag) according to the configured mapping rule and sends it to the vsil instance.
  • Step 4 The vsil instance on the OLT receives the native vlan 1 data stream, extracts the payload, and searches the vsi forwarding table according to the destination MAC address. If the corresponding egress is obtained, such as PW1, the PW/LSP is encapsulated and sent to the peer PE2.
  • Step 5 The PW1 data stream is sent to the PE2 through the LSP. After receiving the packet, the PE2 decapsulates the PW label and finds the corresponding vsi instance. After the PW/LSP is encapsulated, the payload is removed and forwarded according to the MAC. Export (such as UNI3). The UNI port is used as an example here. The other UNI ports receive data in the same way as above.
  • Embodiment 5 This embodiment provides a service implementation method. This embodiment combines the above embodiments and preferred embodiments thereof. FIG.
  • EVP-LAN service implementation map (per EVC) according to an embodiment of the present invention.
  • EVC EVP-LAN service implementation map
  • this embodiment describes an EVP-LAN (Ethernet Virtual Private LAN) service, which implements MP2MP service transmission from vlan1 to vlanX on UNI1 and vlanY on UNI4, and vlan2 to I on UNI1.
  • the MP2MP service of the vlanZ is transmitted on the I4.
  • the method includes the following steps: Step 1: Create two VC connections between the UNI1 on the ONU and the logical UNI port on the OLT side, respectively VC1 and P2.
  • the two UM port identifiers of VC1 are vlanl and native vlanl, respectively.
  • the two UNI port identifiers of VC2 are vlan2 and native vlan2.
  • VC 1 and P VC2 are of the P2P type.
  • Step 2 Configure the intermediate association attributes of VC1 and VC2 as pon vlanl and pon vlan2.
  • Step 3 Configure virtual private line instances vsil and vsi2 on the OLT.
  • Step 4 Configure VC1 and VC2 to be associated with vsil and vsi2 respectively.
  • VC1 and VC2 share LLID1.
  • Step 5 Configure Layer 3 interfaces and routes (dynamic or static routes) on the OLT, enable label distribution protocol learning, and establish LSPs.
  • Step 6 Configure PW1 on the OLT, specify the peer as PE2, and associate it with vsil.
  • Configure PW2 on the OLT and specify the peer as PE3 and associate it with vsil.
  • Configure PW3 on the OLT specify the peer as PE3, and associate it with vsi2.
  • Step 7 The peer PE2 and PE3 complete the corresponding L2VPN configuration. If the peer end is also a PON system, the establishment manner is the same as steps 1 to 6 above. It should be noted that Steps 1 and 2 are equivalent to completing the following two configurations:
  • mapping between vlanl and pon vlanl on UNI1 is configured on the ONU. When data is forwarded, vlanl is not used as the payload and is stripped.
  • mapping between vlan2 and pon vlan2 on UNI1 is configured on the ONU. When data is forwarded, vlan2 is not used. The payload is stripped).
  • Step 4 is equivalent to completing the following configuration: Configure native vlanl to associate to vsil on the OLT; configure native vlan2 to lj vsi2 on the OLT.
  • the data stream forwarding process includes the following steps: Step 1: The data stream received on the UNI1 of the ONU.
  • Step 2 If the data packet carries the vlan tag as vlanl, according to the mapping relationship, the vlanl is stripped and pon vlanl is added and sent to the OLT. If the data packet carries the vlan tag as vlan2, according to the mapping relationship, after vlan2 is stripped, pon vlan2 is added and sent to the OLT. It should be noted that the subsequent process of the data stream forwarding process after step 2 is the same as that in the fourth embodiment.
  • Embodiment 6 This embodiment provides a service implementation method. This embodiment combines the foregoing embodiments and preferred embodiments thereof.
  • FIG. 11 is an E-Tree: EP-Tree service implementation map according to an embodiment of the present invention.
  • this embodiment describes an EP-Tree (Ethernet Private Tree) service.
  • the port-level root multi-point service transmission between UNI 1, UNI2, and UNI3 is implemented.
  • UNI3 is root, UNI1, and UNI2 are leaves.
  • the method includes the following steps: Step 1: Create UNI1 and UNI2 on the ONU and logical UNI port on the OLT side.
  • the two UNI port identifiers of VCl are the port identifier (MAC address) of UNI1 and the native vlanl.
  • the two UNI port identifiers of VC2 are the port identifier of UNI2 and native vlan2.
  • VCl and P VC2 are of the P2P type.
  • Step 2 Configure the intermediate association attributes of VC1 and VC2 as tls vlanl and tls vlan2 respectively.
  • Step 3 Configure the virtual switch instance vsil on the OLT.
  • Step 4 Configure VCl and VC2 to be associated with vsil respectively, and specify the attributes of each VC as leaf.
  • Step 5 Configure Layer 3 interfaces and routes (dynamic or static routes) on the OLT, enable label distribution protocol learning, and establish LSPs.
  • Step 6 Configure PW1 on the OLT, specify the peer as PE2, and associate it with vsil. Specify the attribute root.
  • Step 7 The peer PE2 and PE3 complete the corresponding L2VPN configuration. If the peer end is also a PON system, refer to steps 1 to 6 above for the establishment mode. It should be noted that the tls vlan in FIG. 11 can be replaced by an LLID or a GEM port. It should be noted that Steps 1 and 2 are equivalent to completing the following two configurations:
  • mapping between UNI1 and tls vlan1 is configured on the ONU.
  • the mapping between UNI2 and tls vlan2 is configured on the ONU.
  • Step 4 is equivalent to completion
  • the following configuration On the OLT, configure native vlanl to associate with vsil and specify the attribute leaf. On the OLT, configure native vlan2 to associate with vsil and specify the attribute leaf.
  • FIG. 12 is an E-Tree: EVP-Tree service implementation map according to an embodiment of the present invention. Per EVC per SF multiple LLID), as shown in FIG.
  • this embodiment describes an EVP-Tree (Ethernet Virtual Private Tree) service, which implements rooted multi-point service transmission of vlanX on vlanl, vlan2 to UNI3 on UNIL, where UNI3 is used.
  • the vlanX is root.
  • the method includes the following steps: Step 1: Create two VC connections between the UNI1 on the ONU and the logical UNI port on the OLT, namely VC1 and P2.
  • the two UM port identifiers of VC1 are vlanl and native vlanl, respectively.
  • the two UNI port identifiers of VC2 are vlan2 and native vlan2.
  • VC1 and VC2 are of the P2P type.
  • Step 2 Configure the intermediate association attributes of VC1 and VC2 as pon vlanl and pon vlan2.
  • Step 3 Configure the virtual private line instance vsil on the OLT.
  • Step 4 Configure VC1 and VC2 to be associated with vsil respectively. Specify VC1 and VC2 attributes as leaf.VCl and VC2 share I ID1.
  • Step 5 Configure Layer 3 interfaces and routes on the OLT. Dynamic or static routing), enable label distribution protocol learning and establish LSPs.
  • Step 6 Configure PW1 on the OLT, specify the peer as PE2, and associate it with vsil.
  • Step 7 The peer PE2 completes the corresponding L2VPN configuration.
  • Steps 1 to 6 are equivalent to completing the following configurations:
  • mapping between vlanl and pon vlanl on UNI1 is configured on the ONU. When data is forwarded, vlanl is not used as the payload and is stripped.
  • mapping between vlan2 and pon vlan2 on UNI1 is configured on the ONU. When data is forwarded, vlan2 is not used. The payload is stripped).
  • Step 4 is equivalent to completing the following configuration: Configure native vlanl to associate to vsil on the OLT, and specify the attribute leaf. On the OLT, configure native vlan2 to associate with vsil and specify the attribute leaf.
  • the entire data path is opened. The data forwarding process is the same as the fifth embodiment except that the data cannot be forwarded between the leaf circuits in the vsi.
  • Embodiment 8 This embodiment provides a service implementation method. This embodiment combines the foregoing embodiments and preferred embodiments thereof.
  • EVP-LAN Ethernet Virtual Private LAN
  • Step 1 Create three VC connections between UNI1 on the ONU and the logical UNI port on the OLT, namely VC1 and VC2 and VC3.
  • the two UM port identifiers of VC1 are vlanl and native vlanl.
  • the two UNI port identifiers of VC2 are vlan2 and native vlan2 respectively.
  • the two UNI port identifiers of VC3 are vlan3 and native vlan2.
  • VCl and VC2 and VC3 are both P2P.
  • VC1 performs service transmission through LLID1
  • VC2 and VC3 perform service transmission through LLID2.
  • the values of vlan2, vlan3, and pon vlan2, native vlan2 are the same. It should be noted that, by the configuration of steps 1 and 2, the same service from the UNI port (identified by the same vlan) is entered into the same SF for processing, and then carried by the PON link channel.
  • Step 3 Configure virtual private line instances vsil and vsi2 on the OLT.
  • Step 4 Configure VC1 and vsil association, VC2, P, VC, and P vsi2.
  • Step 5 Configure Layer 3 interfaces and routes (dynamic or static routes) on the OLT, enable label distribution protocol learning, and establish LSPs.
  • Step 6 Configure PW1 on the OLT, specify the peer as PE2, and associate it with vsil.
  • Configure PW2 on the OLT and specify the peer as PE3 and associate it with vsil.
  • Configure PW3 on the OLT specify the peer as PE3, and associate it with vsi2.
  • Step 7 The peer PE2 and PE3 complete the corresponding L2VPN configuration.
  • the peer end is also a PON system, refer to steps 1 to 6 above for the establishment mode. It should be noted that the above method is also applicable to the DPoE network shown in FIG. 5.
  • the OLT shown in the foregoing embodiment may be a DPOE System or an OLT in the DPoE System.
  • the corresponding ONU side does not perform aggregation, and one service (EVC) from the ONU side corresponds to one service flow (SF: service flow), and multiple service flows correspond to one PON link identifier. , such as LLID (differentiated by VL AN).
  • FIG. 15 is a structural block diagram of a service forwarding system according to an embodiment of the present invention.
  • the system includes: an OLT 2 and an ONU 4, wherein the OLT 2 includes: an establishing module 22 And the forwarding module 24, the ONU 4 includes: a mapping module 42, which is described in detail below:
  • the ONU 4 includes: a mapping module 42 configured to map the received service to the logical channel of the PON through the Ethernet identifier and/or the UNI port identifier of the ONU, where the PON logical channel is connected to the ONU and its corresponding OLT.
  • the OLT 2 includes: a first establishing module 22, configured to establish a mapping relationship between the PON logical channel and the label protocol forwarding MPLS instance by using the logical UNI port thereon; the forwarding module 24 is connected to the mapping module 42 and configured to map the mapping module 42
  • the service to the PON logical channel is forwarded by the MPLS instance.
  • the OLT is the central office device of the optical access system, the optical line terminal in the PON network, and the DPoE system in the DPoE network.
  • the mapping module 42 is configured to map the received service to the logical channel of the PON through the Ethernet identifier and/or the port identifier of the ONU in one of the following ways: the received service is multiple services, and multiple services One-to-one correspondence with multiple Ethernet identifiers, mapping multiple services corresponding to multiple Ethernet identifiers to one P0N logical channel; receiving the service as multiple services, and multiple services corresponding to one Ethernet identifier, one Ethernet Each service corresponding to the network identifier is mapped to a P0N logical channel; each service in the received service corresponds to an Ethernet identifier or a port identifier of the NU of the ONU, and an Ethernet identifier corresponding to each service or each The port identifier of the UNI corresponding to the service maps each service to its corresponding PON logical channel.
  • the establishing module is configured to establish a mapping relationship between the Ethernet identifier corresponding to the service and the P0N logical channel and the mapping relationship between the Ethernet identifier corresponding to the service and the MPLS instance by using the logical UNI interface on the OLT.
  • FIG. 16 is a block diagram of a preferred structure of a service forwarding system according to an embodiment of the present invention. As shown in FIG. 16, the system further includes: a configuration module 162. The foregoing structure is described in detail. The system further includes: a configuration module 162. Set up to establish a virtual connection between the UNI port of the ONU and the logical II port of the OLT. The VC is used to implement the mapping between the ONU and the OLT.
  • the attributes of the VC include: the identifier of the UNI port of the ONU, the identifier of the logical UNI port of the OLT, and the VC. Intermediate associated variable.
  • the foregoing embodiment provides a service forwarding method and system, and the ONU maps the received service to the PON logical channel, and then the OLT maps the mapping between the PON logical channel and the MPLS instance to the PON logical channel.
  • the service is forwarded through MPLS, which overcomes the problem that the PON system ONU needs a large number of configurations in order to support multiple service models, and the configuration management process is relatively cumbersome, thereby achieving the effect of reducing the complexity and cost of the ONU.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device so that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is 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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  • Computer Networks & Wireless Communication (AREA)
  • Small-Scale Networks (AREA)

Abstract

La présente invention se rapporte à un procédé et à un système de transfert de service. Le procédé selon l'invention comprend les étapes suivantes : une ONU mappe un service reçu par rapport au canal logique d'un PON au moyen d'un ID Ethernet et/ou d'un ID de port UNI d'une interface réseau utilisateur de l'ONU, le canal logique du PON étant un canal logique qui connecte l'ONU à son OLT correspondante; l'OLT établit des relations de mappage entre le canal logique du PON et une instance MPLS via le port logique UNI qu'elle comporte; et l'OLT transfère le service mappé sur le canal logique du PON via l'instance MPLS. La mise en œuvre de la présente invention permet de réduire la complexité d'une ONU et de réaliser des économies de coûts.
PCT/CN2012/072977 2011-03-25 2012-03-23 Procédé et système de transfert de service WO2012130109A1 (fr)

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