CN114339494B - Method and device for accessing Vlan aggregation service into MPLS in PON - Google Patents
Method and device for accessing Vlan aggregation service into MPLS in PON Download PDFInfo
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Abstract
The invention discloses a method and a device for accessing Vlan-aggregate (Supervlan) business into MPLS in PON, and relates to the technical field of optical fiber access. The method comprises the following steps: when the service is accessed, the OLT maps at least one AC of the combination of the SubVlan and the PON port for each SuperVlan, and the service of the SuperVlan is accessed into one L2VPN in at least one AC mode; when service forwarding is carried out, the OLT establishes a VSI for each Supervlan service accessed to the L2 VPN; and (3) taking the different subvlan+PON port combinations as different ACs to be accessed into the VSI, and processing the two-layer forwarding logic between the ACs and the VCs through the VSI. The invention can simplify the super vlan service access model, so that the user configuration is simpler and more convenient, and the super vlan service is forwarded through one L2VPN as a whole, thereby saving the tunnel label resource of the MPLS network and meeting the actual application requirements.
Description
Technical Field
The invention relates to the technical field of optical fiber access, in particular to a method and a device for accessing Vlan-aggregate (Supervlan) business into MPLS in PON.
Background
PON (Passive Optical Network ) technology is a point-to-multipoint optical fiber access technology. A PON network is typically composed of an OLT (Optical Line Terminal, cable termination device) on the office side, ONUs (Optical Network Unit, cable network elements) on the user side, and ODNs (Optical Distribution Network, cable distribution network). The optical fiber access mode based on the PON technology realizes a plurality of advantages of high speed, large capacity, high security and the like, and is a mainstream technology for the development of access networks nowadays. Current mainstream PON network technologies include EPON (Ethernet PON), and GPON (Gigabit-Capable PON, gigabit passive optical network).
MPLS (Multi-protocol Label Switching, multiprotocol label switching) two-Layer private networks offer MPLS-based L2VPN (Layer 2Virtual Private Network, two-Layer virtual private network) services. It has mainly two modes: one is VPWS (Virtual Private Wire Service, virtual private line service) that provides point-to-point virtual private two-layer lines as services to customers; another is VPLS (Virtual Private LAN Service ) that provides point-to-multipoint virtual private LANs (Local Area Network ) to clients as services.
SuperVlan (Super Virtual LAN, super Virtual local area network, also called Vlan-aggregate) is a Vlan (Virtual LAN) aggregation technique. The principle is that a super vlan comprises a plurality of Sub Virtual LANs (subvirtual local area networks), each Sub vlan is a broadcast domain, and two layers of isolation can be realized between different Sub vlans. The SuperVlan can optimize IP (Internet Protocol, internetworking protocol) address management, and can distribute the IP of one network segment to different SubVlan, so that the SuperVlan has wide application in PON network construction.
At present, in the PON network, two-layer service access MPLS tunnel network mainly adopts Vlan-based L2VPN, and in practical application, there are many scenarios in which the service is divided by SuperVlan. If access of such a SuperVlan traffic into the L2VPN network is to be achieved, a configuration operation for accessing the L2VPN needs to be performed separately for each of the SubVlan under the SuperVlan. Thus, the super vlan service access model is complex, the configuration is complex, and a large amount of MPLS label resources are occupied when a plurality of L2 VPNs are started.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, and provides a method and a device for accessing Vlan aggregation (Supervlan) business into MPLS in PON, which not only can simplify a Supervlan business access model and simplify user configuration, but also can save tunnel label resources of an MPLS network by forwarding the whole Supervlan business through an L2VPN, thereby meeting the actual application requirements.
In order to achieve the above object, the present invention provides a method for accessing Vlan-aggregate traffic to MPLS in PON, the method comprising:
when the service is accessed, the OLT maps at least one AC of the combination of the SubVlan and the PON port for each SuperVlan, and the service of the SuperVlan is accessed into one L2VPN in at least one AC mode;
when service forwarding is carried out, the OLT establishes a VSI for each Supervlan service accessed to the L2 VPN; and (3) taking the different subvlan+PON port combinations as different ACs to be accessed into the VSI, and processing the two-layer forwarding logic between the ACs and the VCs through the VSI.
On the basis of the technical scheme, the OLT maps at least one AC access link of the combination of the SubVlan and the PON port for each SuperVlan, and accesses the service of the SuperVlan into one L2VPN in at least one AC mode, and the method specifically comprises the following operations:
the OLT receives different types of services belonging to the same Supervlan from the ONU equipment through different logic channels; the OLT maps each logic channel into a service flow of a subvlan+PON port, each service flow has an AC matched with the combination of the subvlan+PON port, and the service flow corresponding to the logic channel is accessed into the L2VPN through the AC.
On the basis of the technical scheme, the method further comprises the following steps: when the Supervlan traffic changes, the change of the Supervlan traffic is adapted by adding and deleting corresponding ACs.
On the basis of the technical scheme, the SuperVlan business changes, including a new SuperVlan operation, a SuperVlan addition SubVlan operation, a SubVlan addition PON port operation, a SuperVlan deletion SubVlan operation, a SubVlan deletion PON port operation and a SuperVlan deletion operation;
the adaptation of the Supervlan traffic by adding and deleting corresponding ACs specifically comprises the following operations:
when a new super vlan is built, traversing all the sub vlan under the super vlan and all the binding PON ports of each sub vlan, adding an AC matched with each sub vlan + PON port combination, and binding the AC to an accessed L2 VPN;
when the SuperVlan is increased by the SubVlan operation, traversing all the bound PON ports of the increased SubVlan, adding an AC matched with the increased subvlan+PON port combination, and binding the AC to the accessed L2 VPN;
when the SubVlan increases the PON port operation, adding an AC matched with the combination of the SubVlan and the PON port, and binding the AC into the accessed L2 VPN;
when the SubVlan is deleted, traversing all the bound PON ports of the SubVlan, and unbinding the AC of the subvlan+PON port combination corresponding to the SubVlan from the L2 VPN;
when the SubVlan deletes the PON port operation, unbinding the AC of the subvlan+PON port combination corresponding to the PON port from the L2 VPN;
when deleting the SuperVlan, directly deleting the L2VPN corresponding to the SuperVlan.
Based on the technical scheme, when service forwarding is performed in the VPWS scene, the method specifically comprises the following operations: the OLT establishes a VSI for each Supervlan service accessed to the L2 VPN;
when uplink service forwarding is performed, the OLT matches the service flow received from the ONU with the AC of the corresponding subvlan+PON port combination, and accesses the AC into the VSI; marking an MPLS label according to a label packaging rule through a VSI, and then carrying and transmitting the label by a VC;
when downlink service forwarding is performed, the OLT strips off MPLS labels from messages received from the VC, and performs two-layer forwarding according to corresponding two-layer forwarding logic through the VSI processing of the internal two-layer message header.
Based on the technical scheme, when service forwarding is performed in the VPLS scene, the method specifically comprises the following operations: the OLT establishes a VSI for each Supervlan service accessed to the L2 VPN;
when uplink service forwarding is performed, the OLT matches the service flow received from the ONU with the AC of the corresponding subvlan+PON port combination, and accesses the AC into the VSI; the service flow accessed by the AC is delivered to different VCs for bearing by a VSI processing two-layer forwarding logic, and then MPLS labels are marked according to label packaging rules and forwarded through different VC links;
when downlink service forwarding is performed, the OLT strips off MPLS labels from messages received from different VCs, and performs two-layer forwarding according to corresponding two-layer forwarding logic by processing internal two-layer message headers through the VSI.
On the basis of the technical scheme, when the service forwarding is performed, the method further comprises the following operations: the OLT processes the SubVlan Tag as a User-Tag when passing through the VC, so that the SubVlan Tag is transmitted through the L2VPN network.
On the basis of the technical scheme, if the VC is a Raw type VC, the OLT processes the SubVlan Tag as a User-Tag when passing through the VC, so that the SubVlan Tag transparently transmits the L2VPN network, and the method specifically comprises the following operations:
when uplink service forwarding is performed, after the OLT matches the service flow received from the ONU with the AC corresponding to the combination of the SubVlan and the PON port, the SubVlan Tag is regarded as a User-Tag to be reserved in the double-layer MPLS Tag, and the User-Tag is transmitted to the opposite terminal through the VC;
when the downlink service forwarding is performed, the OLT strips off the MPLS label from the service flow coming out of the VC and performs two-layer forwarding by using the SubVlan label.
On the basis of the technical scheme, if the VC is a Tagged type VC, the OLT processes the SubVlan Tag as a User-Tag when passing through the VC, so that the SubVlan Tag is transmitted through the L2VPN network, and the method specifically comprises the following operations:
when uplink service forwarding is performed, after the OLT matches the service flow received from the ONU with the AC corresponding to the combination of the SubVlan and the PON port, the SubVlan Tag is regarded as User-Tag; then according to the standard Tagged type VC processing no Service-Tag message mode, adding a layer of Service-Tag with Vlan1 outside the SubVlan Tag, packaging the double-layer Vlan in the MPLS Tag, and transmitting to the opposite terminal through the VC;
when downlink service forwarding is performed, the OLT strips off MPLS labels from the service flows coming out of the VC; and stripping the Service-Tag with the Vlan at the outer layer of 1, and carrying out two-layer forwarding by using the SubVlan Tag at the inner layer.
The invention also provides a device for accessing Vlan-aggregate (Supervlan) business in the PON to the MPLS, which comprises an OLT, wherein an access module and a forwarding module are arranged in the OLT;
the access module is configured to: when service access is performed, mapping at least one AC of a combination of a SubVlan and a PON port for each Supervlan, and accessing the service of the Supervlan into an L2VPN in a mode of at least one AC;
the forwarding module is configured to: when service forwarding is carried out, a VSI is established for each Supervlan service accessed to the L2 VPN; and (3) taking the different subvlan+PON port combinations as different ACs to be accessed into the VSI, and processing the two-layer forwarding logic between the ACs and the VCs through the VSI.
The invention has the beneficial effects that:
(1) In the invention, when the service is accessed, the super vlan service is mapped into a plurality of ACs for access, each AC is matched with the combination of the sub vlan and the PON port, so that not only can the forwarding requirements of different sub vlan as different two-layer forwarding domains be met, but also each super vlan service can be integrally accessed into one L2VPN without creating one L2VPN for each sub vlan under the super vlan for access, thereby achieving the purposes of simple access model and convenient configuration. In addition, the Supervlan service is forwarded through one L2VPN as a whole, so that the tunnel label resource of the MPLS network can be saved, and the actual application requirement can be met.
(2) In the invention, when service forwarding is carried out, a VSI is established for each Supervlan service accessed to the L2VPN to process corresponding two-layer forwarding logic. The invention adopts the VSI of the general L2VPN to process the two-layer forwarding logic between the AC and the VC, so that special modification of drive and hardware is not needed, and the scheme is more flexible and applicable in realization.
(3) In the invention, in order to meet the changing requirement of the Supervlan service, the corresponding AC is added and deleted to adapt to the change of the Supervlan service, so that the change in the aspect of forwarding logic is not needed, and the L2VPN channel is not needed to be renegotiated, thereby being flexible and applicable and meeting the actual application requirement.
(4) In the invention, in the process of service forwarding, a mechanism of transmitting the SubVlan tag through the L2VPN network is realized, the problem that the SubVlan tag cannot be transmitted to the opposite end of the L2VPN in the prior art is solved, and the practical application requirement is met.
Drawings
Fig. 1 is a flowchart of a method for accessing Vlan-aggregate traffic to MPLS in PON according to an embodiment of the present invention;
fig. 2 is a schematic diagram of service access in an embodiment of the present invention;
fig. 3 is a schematic diagram of service forwarding in a VPWS scenario according to an embodiment of the present invention;
fig. 4 is a schematic diagram of service forwarding in a VPLS scenario according to an embodiment of the present invention;
fig. 5 is a schematic diagram of implementing a SubVlan tag transparent transmission L2VPN network when VC is of a Raw type in the embodiment of the present invention;
fig. 6 is a schematic diagram of implementing a SubVlan tag transparent L2VPN network when VC is a Tagged type in an embodiment of the present invention.
Detailed Description
Aiming at the prior art that the existing L2VPN network model does not support the access of Vlan aggregation (Supervlan) service, to achieve similar effects, an L2VPN needs to be built for each Supervlan under the Supervlan for access and forwarding, so that the problems that the Supervlan service access model is complex and complex in configuration exist, and a large amount of MPLS label resources are occupied when a plurality of L2 VPNs are started. The invention aims to provide a method and a device for accessing Vlan aggregate service into MPLS in PON, which not only realize the integral access of Supervlan service, simplify the model of Supervlan service access, but also simplify the user configuration; and each Supervlan service is forwarded through one L2VPN as a whole, so that the tunnel label resource of the MPLS network can be effectively saved, and the actual application requirement is met.
The main design thought is as follows: when the service is accessed, the OLT maps at least one AC (Attachment Circuit, access link) of the combination of the SubVlan and the PON port for each SuperVlan, and the service of the SuperVlan is accessed into one L2VPN in at least one AC mode; when forwarding the service, the OLT establishes a VSI (Virtual Switch Instance, virtual switching instance) for each Supervlan service accessed to the L2 VPN; and (3) different subvlan+PON port combinations are used as different ACs to be accessed into the VSI, and two-layer forwarding logic between the ACs and the VCs (Virtual circuits) is processed through the VSI.
In the scheme, when the service is accessed, the super vlan service is mapped into a plurality of ACs to be accessed, each AC is matched with the combination of the sub vlan and the PON port, so that the forwarding requirements of different sub vlan for different two-layer forwarding domains can be met, each super vlan service can be integrally accessed into one L2VPN, and one L2VPN is not required to be established for each sub vlan under the super vlan to access, thereby realizing the integral access of the super vlan service, simplifying the model of the super vlan service access, and enabling the user configuration to be simpler and more convenient. And each Supervlan service is forwarded through one L2VPN as a whole, so that the tunnel label resources of the MPLS network can be effectively saved, and the actual application requirements are met.
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
However, it should be noted that: the examples to be presented below are only a few specific examples and are not intended to limit the embodiments of the present invention to the following specific steps, values, conditions, data, sequences, etc. Those skilled in the art can, upon reading the present specification, make and use the concepts of the invention to construct further embodiments not mentioned in the specification.
Example 1
Referring to fig. 1, the present embodiment provides a method for accessing Vlan-aggregate services to MPLS in PON, which specifically includes the following steps:
and A, when the service is accessed, the OLT maps at least one AC combined with a sub vlan + PON port (physical port accessed by the OLT) for each super vlan, and the service of the super vlan is accessed into one L2VPN in at least one AC mode.
It can be understood that, in order to realize the overall access of the super vlan service, simplify the model of the super vlan service access, so that the user configuration is simpler and more convenient, when the service access is performed, the embodiment maps the super vlan service into a plurality of AC accesses, each AC matches the combination of the sub vlan and the PON port, not only can the forwarding requirements that different sub vlan are different two-layer forwarding domains be met, but also each super vlan service can be integrally accessed into one L2VPN (i.e. one super vlan corresponds to one L2 VPN), and each sub vlan under the super vlan does not need to be created with one L2VPN for access, thereby achieving the purposes of simple access model and convenient configuration. In addition, the matching combination and the access mode adopt an access mode based on a Vlan in the general L2VPN technology, so that special modification of a driver and hardware is not needed, and the actual application requirement is met.
For example, referring to fig. 2, a schematic diagram of the present embodiment when performing service access is shown. In the figure, L2VPN: for the two-layer VPN service based on MPLS label switching, two-layer connection can be established between different sites to transfer the two-layer data of the user. And (3) an OLT: and PE (Provider Edge) equipment serving as an L2VPN (virtual private network) finishes mapping and forwarding of service messages from a private network to a public network tunnel and from the public network tunnel to the private network, is connected with an ONU serving as a CE (Customer Edge), and transmits service data from the L2VPN to an ONU side through a PON network. An ONU: and packaging different two-layer Vlan tags of different service data of the user, and transmitting the different two-layer Vlan tags to the OLT side through the PON network. AC: for accessing the link, in this embodiment, the OLT divides the service of the ONU by the SuperVlan, and then the AC accesses the L2VPN in a specific matching manner of the supervlan+pon port under the SuperVlan. Logic channel: refers to a traffic bearer path of a PON network, such as GemPort (G-PON Encapsulation Mode Port, GPON service virtual port) in a GPON or a logical link identification path in an EPON. IFPON: is a PON network interface.
On this basis, as an optional implementation manner, in step a of this embodiment, the OLT maps, for each SuperVlan, at least one AC of the combination of the SubVlan and the PON port, and accesses the service of the SuperVlan to one L2VPN in at least one AC mode, which specifically includes the following operations:
(1) The OLT receives different types of services belonging to the same Supervlan from the ONU equipment through different logic channels;
(2) The OLT maps each logic channel into a service flow of a subvlan+PON port, each service flow has an AC matched with the combination of the subvlan+PON port, and the service flow corresponding to the logic channel is accessed into the L2VPN through the AC.
Further, in practical applications, there may be a case where the SuperVlan traffic is changed, for example, an operation of modifying the SubVlan or PON port may be performed. Since the super vlan is aggregated by a plurality of sub vlan, one super vlan service accesses the L2VPN, that is, the set of all sub vlan+pon ports under the super vlan, and accesses the L2VPN by a plurality of corresponding ACs, when the super vlan service changes, the AC accessing the L2VPN also changes. In order to meet the changing requirement of the Supervlan service, the corresponding ACs are added and deleted to adapt to the change of the Supervlan service, so that the change in forwarding logic is not needed, and the L2VPN channel is not needed to be renegotiated, so that the method is flexible and applicable, and the practical application requirement is met.
Specifically, as an optional implementation manner, the variation of the SuperVlan traffic in this embodiment includes: newly-built SuperVlan operation, superVlan-added SubVlan operation, subVlan-added PON-port operation, superVlan-deleted SubVlan operation, subVlan-deleted PON-port operation, and delete SuperVlan operation.
On the basis, in this embodiment, the corresponding AC is added and deleted to adapt to the change of the SuperVlan service, which specifically includes the following operations:
(1) When a super vlan is newly built, traversing all the SubVlan under the super vlan and all the binding PON ports of each SubVlan, adding an AC matched with each subvlan+PON port combination, and binding the AC to an accessed L2VPN. For example, assuming that there are two SubVlan (SubVlan 1, subVlan 2) under the SuperVlan, each SubVlan is bound with two PON ports (PON port 1, PON port 2), then there are four groups of subvlan+pon port combinations: subVlan1+pon port 1, subVlan1+pon port 2, subVlan2+pon port 1, subVlan2+pon port 2; then four more ACs are needed to match the four sets of SubVlan + PON port combinations described above.
(2) When the SuperVlan is increased by the SubVlan operation, traversing all the binding PON ports of the increased SubVlan, adding an AC matched with the increased subvlan+PON port combination, and binding the AC to the accessed L2VPN.
(3) When the SubVlan increases PON port operation, add AC matched with the subvlan+PON port combination, and bind to the accessed L2VPN.
(4) When the SubVlan is deleted, all the bound PON ports of the SubVlan are traversed, and the AC of the subvlan+PON port combination corresponding to the SubVlan is unbinding from the L2VPN. It will be appreciated that in actual operation, if the SuperVlan is not bound to any SubVlan after deleting the SubVlan, the L2VPN corresponding to the SuperVlan is deleted directly.
(5) When a SubVlan deletes a PON port operation, an AC of a subvlan+pon port combination corresponding to the PON port is unbinding from the L2VPN. It can also be understood that if the SuperVlan where the PON port is deleted is not bound to any PON port, the L2VPN corresponding to the SuperVlan is deleted directly.
(6) When deleting the SuperVlan, directly deleting the L2VPN corresponding to the SuperVlan.
Step B, when the service forwarding is carried out, the OLT establishes a VSI for each Supervlan service accessed to the L2 VPN; and (3) taking the different subvlan+PON port combinations as different ACs to be accessed into the VSI, and processing the two-layer forwarding logic between the ACs and the VCs through the VSI. It can be understood that, in this embodiment, the VSI is a virtual ethernet bridge functional entity on the PE, and can perform two-layer forwarding according to the MAC and VLAN tags; the VC is a bidirectional virtual link between two PE (namely OLT) and can carry out MPLS encapsulation on the AC accessed service and send the MPLS encapsulated service to the opposite PE (namely OLT).
It can be understood that, when the access is performed before, the OLT will access each subvlan+pon port under the SuperVlan as an AC to the L2VPN. In order to realize forwarding logic when forwarding the service, the embodiment establishes a VSI for each SuperVlan service accessing the L2VPN to process the corresponding two-layer forwarding logic, thereby realizing forwarding of the service. The VSI is a virtual ethernet bridge functional entity on the PE, and can perform two-layer forwarding according to the MAC and the VLAN TAG, and isolate the two-layer forwarding of the L2VPN from other forwarding domains on the OLT device. In addition, because the VSI used in the embodiment is used for processing the two-layer forwarding logic between the Vlan-accessed AC and the MPLS-accessed VC, the VSI forwarding module of the universal L2VPN can be directly adopted in practical application, and no special modification is required for the driver and hardware, so that the scheme is more flexible and applicable in implementation.
Further, since the L2VPN based on MPLS includes a VPWS scenario (providing a point-to-point virtual private two-layer line) and a VPLS scenario (providing a point-to-multipoint virtual private LAN), for better understanding of the forwarding manner of this embodiment, a specific flow when forwarding traffic will be described below for the two scenarios.
Specifically, service forwarding is performed in a VPWS scenario, including the following operations:
(1) The OLT establishes a VSI for each SuperVlan traffic that accesses the L2VPN.
(2) When uplink service forwarding is performed, the OLT matches the service flow received from the ONU with the AC of the corresponding subvlan+PON port combination, and accesses the AC into the VSI; marking MPLS labels according to label packaging rules through VSI, and then transmitting by a VC carrier. For example, as shown in fig. 3, assume that in the current VPWS scenario, the SuperVlan includes two SubVlan1 and SubVlan2, and the OLT establishes a VSI for the SuperVlan. Then, when forwarding the upstream traffic, the OLT matches the traffic received from the ONU with an AC corresponding to the subvlan+pon port combination (e.g., AC1 matching SubVlan1+pon port or AC2 matching SubVlan2+pon port in fig. 3); then accessing the matched AC (such as AC1 or AC2 in FIG. 3) into the VSI; finally, marking MPLS labels according to label packaging rules through VSI, and then transmitting the label to the opposite end through a VC carrier.
(3) When downlink service forwarding is performed, the OLT strips off MPLS labels from messages received from the VC, and performs two-layer forwarding according to corresponding two-layer forwarding logic through the VSI processing of the internal two-layer message header.
Still more particularly, traffic forwarding in a VPLS scenario includes the following operations:
(1) The OLT establishes a VSI for each SuperVlan traffic that accesses the L2VPN.
(2) When uplink service forwarding is performed, the OLT matches the service flow received from the ONU with the AC of the corresponding subvlan+PON port combination, and accesses the AC into the VSI; and delivering the service flow accessed by the AC to different VCs for bearing by a VSI processing two-layer forwarding logic, marking an MPLS label according to a label packaging rule, and forwarding through different VC links. For example, as shown in fig. 4, it is assumed that 5 ONUs are suspended below PON port 1 and PON port 2 to which the OLT accesses in the current VPLS scenario, where the SubVlan includes three subvlans (a plurality of subvlans may be configured on a plurality of PON ports, three subvlans are exemplified in this figure), and the OLT establishes a VSI for the SubVlan. Then, when forwarding the upstream traffic, the OLT matches the traffic received from the ONU with an AC corresponding to the subvlan+pon port combination (e.g., AC1 matching SubVlan1+pon port 1 or AC2 matching SubVlan2+pon port 1 or AC3 matching SubVlan2+pon port 2 or other in fig. 4); then accessing the matched AC (such as AC1, AC2, AC3 or AC4 in FIG. 4) into the VSI; finally, the service flow accessed by the AC (such as AC1, AC2, AC3 or AC4 in fig. 4) is delivered to different VCs (such as VC1 or VC2 in fig. 4) to be carried by a VSI processing two-layer forwarding logic, and then MPLS labels are marked according to label packaging rules and forwarded through different VC links. It will be appreciated that, in general, PON network applications require two-layer isolation to be opened between PON ports, so in practical applications, forwarding isolation is opened by default between ACs to prevent forwarding between PON ports.
(3) When downlink service forwarding is performed, the OLT strips off MPLS labels from messages received from different VCs, and performs two-layer forwarding according to corresponding two-layer forwarding logic by processing internal two-layer message headers through the VSI.
Further, it can be understood that the combination of AC matching subvlan+pon port in this embodiment adopts a Vlan access method of the generic L2VPN technology. In the general L2VPN forwarding flow, the AC accesses the L2VPN in a Vlan manner, and the corresponding Vlan Tag is regarded as a Service-Tag (Service Vlan Tag, vlan Tag of differentiated services in the message when the L2VPN is forwarded). When passing through the taged type of VC, the Service-Tag is stripped off when the VC is discharged; when passing through the Raw type VC, the Service-Tag can be stripped off when entering the VC. This would result in the SubVlan tag not being able to be transferred to the L2VPN peer. However, in the super vlan traffic, two-layer broadcast domains are often distinguished based on the SubVlan tag, and therefore, there is a need to save the SubVlan tag to the receiving side of the L2VPN network in practical use. In order to realize transparent transmission of SubVlan tags to the L2VPN network, thereby meeting the practical application requirements, as a preferred implementation manner, the step B of this embodiment further includes the following operations: the OLT processes the SubVlan Tag as a User-Tag (the User Vlan Tag, when the L2VPN is forwarded, the Vlan Tag from the User in the message) when passing through the VC, so that the SubVlan Tag is transmitted through the L2VPN network.
Specifically, as shown in fig. 5, if the VC is a Raw type VC, the OLT processes the SubVlan Tag as a User-Tag when passing through the VC, so that the SubVlan Tag transparently transmits the L2VPN network, and specifically includes the following operations:
when uplink service forwarding is performed, after the OLT matches the service flow received from the ONU with the AC corresponding to the combination of the SubVlan and the PON port, the SubVlan Tag is regarded as a User-Tag to be reserved in the double-layer MPLS Tag, and the User-Tag is transmitted to the opposite terminal through the VC; for example, as shown in fig. 5, when the OLT1 performs uplink Service forwarding, after the OLT1 matches the received Service flow with the AC of the corresponding subvlan+pon port combination, the AC accesses the L2VPN in a Vlan manner, the corresponding Vlan Tag is regarded as a Service-Tag, and the Service-Tag is stripped when passing through the Raw type VC, and then enters the VC; at this time, in order to realize the transmission of the SubVlan Tag through the L2VPN network, the OLT1 may consider the SubVlan Tag as a User-Tag to be reserved in the dual-layer MPLS Tag, that is, as shown in fig. 5, the frame format includes: L2-Header, tunnelLabel, VC Label, L2-Header, subVlan, IP-Header, and Data, wherein the SubVlan Tag is considered to be User-Tag reserved; finally, the video is transmitted to the opposite terminal OLT2 through the VC.
When downlink service forwarding is performed, the OLT strips off MPLS labels from the service flows coming out of the VC and performs two-layer forwarding by using SubVlan labels; for example, as shown in FIG. 5, when the OLT2 performs downstream forwarding, the OLT2 strips off the MPLS labels from the traffic streams (frame formats including L2-Header, tunnelLabel, VC Label, L2-Header, subVlan, IP-Header and Data), and the frame formats from which the MPLS labels are stripped include: L2-Header, subVlan, IP-Header and Data; the OLT2 will then forward the SubVlan tag in the frame format in two layers.
More specifically, as shown in fig. 6, if the VC is a triggered type VC, the OLT processes the SubVlan Tag as a User-Tag when passing through the VC, so that the SubVlan Tag transparently transmits the L2VPN network, and specifically includes the following operations:
when uplink service forwarding is performed, after the OLT matches the service flow received from the ONU with the AC corresponding to the combination of the SubVlan and the PON port, the SubVlan Tag is regarded as User-Tag; then according to the standard Tagged type VC processing no Service-Tag message mode, adding a layer of Service-Tag with Vlan1 outside the SubVlan Tag, packaging the double-layer Vlan in the MPLS Tag, and transmitting to the opposite terminal through the VC; for example, as shown in fig. 6, when the OLT3 performs uplink service forwarding, after the OLT3 matches the traffic stream received from the ONU with the AC of the corresponding subvlan+pon port combination (the frame format includes L2-Header, subVlan, IP-Header and Data), the SubVlan Tag is regarded as the User-Tag because the SubVlan is the Vlan Tag carried in the received traffic stream; according to the standard taged type VC processing non-Service-Tag message mode, adding a layer of Service-Tag with Vlan1 outside the SubVlan Tag, and forming a frame format comprising: L2-Header, tunnelLabel, VC Label, L2-Header, vlan1, subVlan, IP-Header and Data; the OLT3 is then passed to the opposite end through the VC.
When downlink service forwarding is performed, the OLT strips off MPLS labels from the service flows coming out of the VC; stripping the Service-Tag with the outer Vlan of 1, and carrying out two-layer forwarding by using the SubVlan Tag of the inner layer; for example, as shown in FIG. 6, when the OLT4 performs downlink traffic forwarding, the OLT4 strips off MPLS labels and Service-tags with an outer Vlan of 1 from traffic streams (frame formats including L2-Header, tunnelLabel, VC Label, L2-Header, vlan1, subVlan, IP-Header and Data), and the stripped frame formats include: L2-Header, subVlan, IP-Header and Data; the OLT4 will then forward the SubVlan tag in the frame format in two layers.
Example two
Based on the same inventive concept, the embodiment of the invention also provides a device for accessing Vlan-aggregate (SuperVlan) business into MPLS in PON, which comprises an OLT, wherein an access module and a forwarding module are arranged in the OLT.
Wherein, the access module is used for: when the service is accessed, mapping at least one AC of the combination of the SubVlan and the PON port for each SuperVlan, and accessing the service of the SuperVlan into one L2VPN in at least one AC mode.
A forwarding module, configured to: when service forwarding is carried out, a VSI is established for each Supervlan service accessed to the L2 VPN; and (3) taking the different subvlan+PON port combinations as different ACs to be accessed into the VSI, and processing the two-layer forwarding logic between the ACs and the VCs through the VSI.
It can be understood that by adopting the device of the embodiment, not only the model of the access of the Supervlan service can be simplified, so that the user configuration is simpler and more convenient, but also the Supervlan service is forwarded wholly through one L2VPN, so that the tunnel label resource of the MPLS network can be saved, and the actual application requirement can be met.
It should be noted that, various modifications and embodiments of the foregoing method embodiment are equally applicable to the apparatus of this embodiment, and those skilled in the art will be aware of the implementation method of the apparatus of this embodiment through the foregoing detailed description of the method, so they will not be described in detail herein for brevity.
Note that: the particular embodiments described above are illustrative only and not restrictive, and those skilled in the art may combine and combine steps and means from the various embodiments described above separately to achieve the benefits of the present invention in accordance with the concepts of the present invention, such combined and combined embodiments also being encompassed by the present invention, such combination and combination not being described in detail herein.
The advantages, effects, etc. mentioned in the embodiments of the present invention are merely examples, and are not to be construed as necessarily limiting the various embodiments of the present invention. In addition, the foregoing specific details of the embodiments of the invention have been disclosed for purposes of illustration and understanding only, and are not intended to be limiting, since the embodiments of the invention must not be practiced with the specific details.
The block diagrams of the devices, apparatuses, devices, systems according to the embodiments of the present invention are merely illustrative examples, and are not intended to require or imply that connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used in embodiments of the present invention refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used in embodiments of the present invention refers to, and is used interchangeably with, the phrase "such as, but not limited to.
The step flow diagrams in the embodiments of the invention and the method descriptions above are merely illustrative examples and are not intended to require or imply that the steps of the various embodiments must be performed in the order presented. The order of steps in the above embodiments may be performed in any order, as will be appreciated by those skilled in the art. Words such as "thereafter," "then," "next," and the like are not intended to limit the order of the steps; these words are simply used to guide the reader through the description of these methods. Furthermore, any reference to an element in the singular, for example, using the articles "a," "an," or "the," is not to be construed as limiting the element to the singular.
In addition, the steps and means in the various embodiments of the present invention are not limited to practice in a certain embodiment, and indeed, the relevant partial steps and partial means in the various embodiments herein may be combined according to the concept of the present invention to contemplate new embodiments, which are also included in the scope of the present invention.
The operations of embodiments of the present invention may be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and/or software components and/or modules including, but not limited to, circuitry or a processor of the hardware.
The method of an embodiment of the invention includes one or more acts for implementing the method described above. The methods and/or acts may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of acts is specified, the order and/or use of specific acts may be modified without departing from the scope of the claims.
The functions of the embodiments of the present invention may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored as one or more instructions on a tangible computer-readable medium. A storage media may be any available tangible media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other tangible medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. As used herein, discs (disks) and disks include Compact Disks (CDs), laser disks, optical disks, DVDs (Digital Versatile Disc, digital versatile disks), floppy disks, and blu-ray disks where disks reproduce data magnetically, while disks reproduce data optically with lasers.
Thus, the computer program product may perform the operations presented herein. For example, such a computer program product may be a computer-readable tangible medium having instructions tangibly stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein. The computer program product may comprise packaged material.
Other examples and implementations are within the scope and spirit of embodiments of the invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired or any combination of these. Features that implement the functions may also be physically located at various locations including being distributed such that portions of the functions are implemented at different physical locations.
Various changes, substitutions, and alterations to the techniques described herein may be made by those skilled in the art without departing from the teachings as defined by the appended claims. Furthermore, the scope of the claims of the present disclosure is not limited to the particular aspects of the process, machine, manufacture, composition of matter, means, methods and acts described above. The processes, machines, manufacture, compositions of matter, means, methods, or acts, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein may be utilized. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or acts.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the invention to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof. And what is not described in detail in this specification is prior art known to those skilled in the art.
Claims (10)
1. A method for Vlan-aggregate traffic in a PON to access MPLS, the method comprising the steps of:
when the service is accessed, the OLT maps at least one AC of the combination of the SubVlan and the PON port for each SuperVlan, and the service of the SuperVlan is accessed into one L2VPN in at least one AC mode;
when service forwarding is carried out, the OLT establishes a VSI for each Supervlan service accessed to the L2 VPN; and (3) taking the different subvlan+PON port combinations as different ACs to be accessed into the VSI, and processing the two-layer forwarding logic between the ACs and the VCs through the VSI.
2. The method for accessing Vlan-aggregate traffic to MPLS in PON according to claim 1, wherein the OLT maps at least one AC access link of a combination of a SubVlan and PON port for each SuperVlan, and accesses the traffic of the SuperVlan to an L2VPN in at least one AC manner, specifically comprising the following operations:
the OLT receives different types of services belonging to the same Supervlan from the ONU equipment through different logic channels;
the OLT maps each logic channel into a service flow of a subvlan+PON port, each service flow has an AC matched with the combination of the subvlan+PON port, and the service flow corresponding to the logic channel is accessed into the L2VPN through the AC.
3. The method for Vlan-aggregate traffic to access MPLS in a PON as claimed in claim 1, further comprising the steps of:
when the Supervlan traffic changes, the change of the Supervlan traffic is adapted by adding and deleting corresponding ACs.
4. A method for Vlan-aggregate traffic access MPLS in PON as claimed in claim 3, wherein: the super vlan business changes, including a new super vlan operation, a super vlan adding sub vlan operation, a sub vlan adding PON port operation, a super vlan deleting sub vlan operation, a sub vlan deleting PON port operation and a deleting super vlan operation;
the adaptation of the Supervlan traffic by adding and deleting corresponding ACs specifically comprises the following operations:
when a new super vlan is built, traversing all the sub vlan under the super vlan and all the binding PON ports of each sub vlan, adding an AC matched with each sub vlan + PON port combination, and binding the AC to an accessed L2 VPN;
when the SuperVlan is increased by the SubVlan operation, traversing all the bound PON ports of the increased SubVlan, adding an AC matched with the increased subvlan+PON port combination, and binding the AC to the accessed L2 VPN;
when the SubVlan increases the PON port operation, adding an AC matched with the combination of the SubVlan and the PON port, and binding the AC into the accessed L2 VPN;
when the SubVlan is deleted, traversing all the bound PON ports of the SubVlan, and unbinding the AC of the subvlan+PON port combination corresponding to the SubVlan from the L2 VPN;
when the SubVlan deletes the PON port operation, unbinding the AC of the subvlan+PON port combination corresponding to the PON port from the L2 VPN;
when deleting the SuperVlan, directly deleting the L2VPN corresponding to the SuperVlan.
5. The method for Vlan-aggregate traffic to access MPLS in PON according to claim 1, wherein when traffic forwarding is performed in a VPWS scenario, the method specifically comprises the following operations:
the OLT establishes a VSI for each Supervlan service accessed to the L2 VPN;
when uplink service forwarding is performed, the OLT matches the service flow received from the ONU with the AC of the corresponding subvlan+PON port combination, and accesses the AC into the VSI; marking an MPLS label according to a label packaging rule through a VSI, and then carrying and transmitting the label by a VC;
when downlink service forwarding is performed, the OLT strips off MPLS labels from messages received from the VC, and performs two-layer forwarding according to corresponding two-layer forwarding logic through the VSI processing of the internal two-layer message header.
6. The method for Vlan-aggregate traffic to access MPLS in PON of claim 1, wherein when traffic forwarding is performed in a VPLS scenario, the method specifically comprises the following operations:
the OLT establishes a VSI for each Supervlan service accessed to the L2 VPN;
when uplink service forwarding is performed, the OLT matches the service flow received from the ONU with the AC of the corresponding subvlan+PON port combination, and accesses the AC into the VSI; the service flow accessed by the AC is delivered to different VCs for bearing by a VSI processing two-layer forwarding logic, and then MPLS labels are marked according to label packaging rules and forwarded through different VC links;
when downlink service forwarding is performed, the OLT strips off MPLS labels from messages received from different VCs, and performs two-layer forwarding according to corresponding two-layer forwarding logic by processing internal two-layer message headers through the VSI.
7. The method for Vlan-aggregate traffic to access MPLS in a PON of claim 1, further comprising, when forwarding traffic, the operations of:
the OLT processes the SubVlan Tag as a User-Tag when passing through the VC, so that the SubVlan Tag is transmitted through the L2VPN network.
8. The method for accessing Vlan-aggregate traffic to MPLS in PON of claim 7, wherein if the VC is a Raw-type VC, the OLT processes a SubVlan Tag as a User-Tag when passing through the VC, so that the SubVlan Tag transparently passes through the L2VPN network, specifically comprising the following operations:
when uplink service forwarding is performed, after the OLT matches the service flow received from the ONU with the AC corresponding to the combination of the SubVlan and the PON port, the SubVlan Tag is regarded as a User-Tag to be reserved in the double-layer MPLS Tag, and the User-Tag is transmitted to the opposite terminal through the VC;
when the downlink service forwarding is performed, the OLT strips off the MPLS label from the service flow coming out of the VC and performs two-layer forwarding by using the SubVlan label.
9. The method for accessing Vlan-aggregate traffic to MPLS in PON of claim 7, wherein if the VC is a triggered type VC, the OLT processes the SubVlan Tag as a User-Tag when passing through the VC, so that the SubVlan Tag transparently passes through the L2VPN network, specifically comprising the following operations:
when uplink service forwarding is performed, after the OLT matches the service flow received from the ONU with the AC corresponding to the combination of the SubVlan and the PON port, the SubVlan Tag is regarded as User-Tag; then according to the standard Tagged type VC processing no Service-Tag message mode, adding a layer of Service-Tag with Vlan1 outside the SubVlan Tag, packaging the double-layer Vlan in the MPLS Tag, and transmitting to the opposite terminal through the VC;
when downlink service forwarding is performed, the OLT strips off MPLS labels from the service flows coming out of the VC; and stripping the Service-Tag with the Vlan at the outer layer of 1, and carrying out two-layer forwarding by using the SubVlan Tag at the inner layer.
10. An apparatus for Vlan-aggregate traffic access MPLS in PON based on a method according to any one of claims 1-9, wherein: the device comprises an OLT, wherein an access module and a forwarding module are arranged in the OLT;
the access module is configured to: when service access is performed, mapping at least one AC of a combination of a SubVlan and a PON port for each Supervlan, and accessing the service of the Supervlan into an L2VPN in a mode of at least one AC;
the forwarding module is configured to: when service forwarding is carried out, a VSI is established for each Supervlan service accessed to the L2 VPN; and (3) taking the different subvlan+PON port combinations as different ACs to be accessed into the VSI, and processing the two-layer forwarding logic between the ACs and the VCs through the VSI.
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