CN102282805B - Method for service protection and access device - Google Patents
Method for service protection and access device Download PDFInfo
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- CN102282805B CN102282805B CN201180000697.7A CN201180000697A CN102282805B CN 102282805 B CN102282805 B CN 102282805B CN 201180000697 A CN201180000697 A CN 201180000697A CN 102282805 B CN102282805 B CN 102282805B
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/16—Multipoint routing
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Abstract
A method for service protection and an access device are provided. The method includes: the continuity fault detection of service level is performed at a service path between an access node and aggregation node, and a maintenance end point for performing the continuity fault detection of service level is configured at the access node and aggregation node; when the access node detects the continuity fault detection of service level, a standby physical link of a main physical link is activated, so that the standby Label Switching Path (LSP) and standby pseudo wire of the standby physical link are available; the service with fault is switched from the main pseudo wire carrying the service to the standby pseudo wire, wherein the main pseudo wire is the pseudo wire carried by the main LSP at the main physical link, and the standby pseudo wire is the pseudo wire carried by the standby LSP at the standby physical link. By using the method, the service protection process is simplified, and the protection methods of various services such as unicast, multicast and so on are integrated.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of service protecting method and access device.
Background technology
MPLS (Multi-Protocol Label Switching, multiprotocol label switching) technology is a kind of grouping tranmission techniques based on label exchange, and it can support multiple business, and good letter flow process capability is provided, and the flexibility of network design.MPLS mainly contains the mode of two kinds of carrying ether business: a kind of is point-to-point Ethernet private line service, another kind is multi-multipoint Ethernet virtual private LAN service, they correspond respectively to VPWS (Virtual Private Wire Service, virtual private line service) and VPLS (Virtual Private LAN Service, virtual privately owned LAN business) technology.
Under VPWS, traffic packets is PW (Pseudowire on the Ingress node of MPLS network adds, pseudo-line) label and LSP (Label Switching Path, label switched path), after tunnel label, in MPLS network, in the mode of label exchange, be sent to the Egress node of MPLS network.Wherein every pseudo-line is corresponding to a unique PW label value, and a plurality of pseudo-line can be multiplexed in a lsp tunnel and transmits, to improve the autgmentability of network.In business, pass through in pseudo-line transport process, only has entry PE (Provider Edge, supplier edge device) and outlet PE node need to process PW label and carry out Business Processing, and intermediate node only carries out the exchange of LSP label, does not need PW label to process.Between every pair of adjacent node in this path, for example, by physical link layer (Ethernet link layer), carry LSP.VPWS is generally used for the transmission of unicast service.
Under VPLS, MPLS network by emulation Ethernet broadcast domain between PE node to a plurality of customer rs sites of geographically disperseing are linked together.A VPLS example is comprised of a plurality of PE, between PE, by pseudo-line (pseudo-line is equally also carried on LSP), be connected to each other, and by pseudo-line, carry out the transmission of business, the PE pseudo-line of initiating and terminate, and in portion's transponder, according to the MAC Address of ether traffic frame, forward within it.Owing to need to not copying each multicastapackets at source node, so that VPLS transmits for multicast service is higher with respect to VPWS bandwidth efficiency, also so more for multicast service.
Packet network for list/multicast multi-service fusion of the above two kinds of technology of comprehensive employing; when carrying out service protection; need to adopt respectively different protection mechanisms to clean culture and multicast service; and also to carry out sectionalised protection for multicast service; related guard method is more loaded down with trivial details; and limitation is larger, for the protection mechanism of clean culture and multicast service also disunity.
Summary of the invention
The embodiment of the present invention provides a kind of service protecting method and access device, can simplify service protection process, and unifies the guard method under the multiple business such as clean culture and multicast.
In order to solve the problems of the technologies described above, the technical scheme of the embodiment of the present invention is as follows:
A service protecting method, comprising:
On the service path between access node and aggregation node, move service level continuity failure and detect, on described access node and described aggregation node, dispose and can carry out the maintaining end point that described service level continuity failure detects;
When described access node detects the continuity failure of service level, activate the spare physical link of primary physical link, so that the standby label switching path LSP path on described spare physical link and standby pseudo-line can be used;
The business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business, wherein, described primary pseudo-line is the pseudo-line that carry in the primary LSP path on described primary physical link, and described standby pseudo-line is the pseudo-line that carry in the standby LSP path on described spare physical link.
An access device, comprising:
Detecting unit, for and aggregation node between service path on move service level continuity failure and detect, on described access device and described aggregation node, dispose and can carry out the maintaining end point that described service level continuity failure detects;
Activate unit, for when the continuity failure of service level being detected, activate the spare physical link of primary physical link, so that the standby LSP path on described spare physical link and standby pseudo-line can be used;
Switch unit, for the business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business, wherein, described primary pseudo-line is the pseudo-line that carry in the primary LSP path on described primary physical link, and described standby pseudo-line is the pseudo-line that carry in the standby LSP path on described spare physical link.
The embodiment of the present invention is by list/multicast service, access node and aggregation node place configuring maintenance end points at service path, the continuity failure that carries out service level between maintaining end point detects, thereby ignored different layers in this path, the difference of the intersegmental MPLS OAM of Different L SP mechanism, as long as service level continuity failure detected, no matter be clean culture or multicast service, by access node, carry out the activation to spare physical link, so that the standby pseudo-line of the standby LSP path of spare physical link bearer and the carrying of standby LSP path can be used, and the pseudo-line of the business of this business of carrying is switched on the standby pseudo-line in standby LSP path by the primary pseudo-line on primary LSP path, thereby realize the service protection under MPLS multi-service access system.The method has not only been simplified service protection process greatly, and the guard method of having unified clean culture and multicast service.In addition; the method does not need to depend on intermediate node and carries out service protection; can protect multiple services various faults scene; guaranteed the independence of access device; reduced the difficulty of service access configuration; not needing provides different protection mechanisms to clean culture and multicast respectively, thereby disposes more simple.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the application scenarios schematic diagram of unicast service in prior art;
Fig. 2 is the application scenarios schematic diagram of multicast service in prior art;
Fig. 3 is the schematic diagram that multicast service breaks down;
Fig. 4 is a kind of service protecting method flow chart of the embodiment of the present invention;
Fig. 5 is the switch protecting schematic diagram in embodiment illustrated in fig. 4;
Fig. 6 is the another kind of service protecting method flow chart of the embodiment of the present invention;
Fig. 7 is the application scenarios schematic diagram in embodiment illustrated in fig. 6;
Fig. 8 is the switch protecting schematic diagram in middle homology chummage situation embodiment illustrated in fig. 6;
Fig. 9 is the another kind of service protecting method flow chart of the embodiment of the present invention;
Figure 10 is the application scenarios schematic diagram in embodiment illustrated in fig. 9;
Figure 11 is the structural representation between another kind of access node and aggregation node in the embodiment of the present invention;
Figure 12 is the structural representation of a kind of access device of the embodiment of the present invention;
Figure 13 is the structural representation of the another kind of access device of the embodiment of the present invention;
Figure 14 is the structural representation of a kind of MPLS multi-service access system of the embodiment of the present invention.
Embodiment
In order to make those skilled in the art can further understand feature of the present invention and technology contents, refer to following about detailed description of the present invention and accompanying drawing, accompanying drawing only provide with reference to and explanation, be not used for limiting the present invention.
In prior art, based on VPWS and two kinds of technology of VPLS, can there are two kinds of typical architecture in MPLS Access Network.As shown in Figure 1, for access node (Access Node, AN) AN1 provides the scene of unicast service by VPWS technology, as resident family's broadband access network business transmits to a PW on the LSP path of aggregation node (Aggregation Nodes, AGS) AGS2 by access node AN1.Further, in order to improve the reliability of business, access node AN1 is connected respectively to two node AGS1 and AGS3 by primary and backup two physical links, thereby between access node AN1 and aggregation node AGS2, can set up the LSP path of two physical separation, as the primary LSP path through AN1-AGS1-AGS2, and the standby LSP path of process AN1-AGS3-AGS2, because this is main, standby LSP path is homology chummage, so can share the pseudo-line of same, also be that above-mentioned AN1 both can be carried by main LSP path to the pseudo-line of the business between AGS2, also can be carried by standby LSP path, certainly for the homology situation of chummage not, in LSP path separately, carry different pseudo-lines.Wherein, homology chummage represents to import same aggregation node by same access node herein, and homology not chummage represents to import different aggregation nodes by same access node.Main LSP path is carried to another one or more snippets physical link AGS2 by primary physical link and the AGS1 of AN1-AGS1, and standby LSP path is carried to another one or more snippets physical link AGS2 by spare physical link and the AGS3 of AN1-AGS3.When primary physical link breaks down, obviously the LSP path of its carrying there will be fault, now needs to start the switching in LSP path or also will carry out the switching of the pseudo-line in each LSP path, to guarantee the normal operation of business.
As shown in Figure 2, for access node AN2 provides the scene of multicast service by VPLS technology.In order to improve the reliability of business, similarly, access node AN2 is connected respectively to two node AGS4 and AGS6 by two primary and backup physical links, thereby, between access node AN2 and aggregation node AGS5, also there is the service path of two physical separation, as the main path through AN2-AGS4-AGS5, and the backup path of process AN2-AGS6-AGS5, but, in multicast service, first the descending ether multicast service grouping that BRAS2 provides is carried out pseudo-line encapsulation and carries by LSP2 at AGS5, then by VPLS network, multicastapackets is sent to AGS4, AGS4 receives and decapsulation obtains after Ether frame at its virtual switch instance (Virtual Switch Instance, VSI) in transponder module, according to MAC Address, down forward, finally by LSP1, arrive AN2, so main path and backup path all comprise two sections of LSP paths, for example main path comprises LSP1 and LSP2 path, backup path comprises LSP3 and LSP4 path.On each section of LSP path, carry each self-corresponding pseudo-line, access node AN2 transmits to the pseudo-line of each section of LSP path carrying in main path of the business between aggregation node AGS5, each section of LSP path carried by each section of physical layer link of its correspondence, and for example LSP1 path is carried by the physical layer link of AN1-AGS4.Wherein, in multicast service, the AN2-AGS6 physical layer link in the AN2-AGS4 physical layer link in carrying LSP1 path and carrying LSP3 path can not activate in running order simultaneously, otherwise will there is loopback, be that descending multicastapackets enters after AN2 from the LSP1 path of AGS4-AN2 link, multicast forwarding due to AN2, so may return to again VPLS network from the LSP3 path of another AN2-AGS6 link, and continue to arrive same AGS equipment through VPLS network, cause occurring path loopback.Therefore, for multicast service, conventionally only has primary physical link in state of activation, when it breaks down, obviously the LSP1 of its carrying there will be fault, now, can the agreement (for example Ethernet is across frame LAG agreement 802.1AX) based on physical layer activates the spare physical link section of this section of primary physical link, start LSP1 and switch to the switching of the LSP3 of this spare physical link section carrying and the pseudo-line of corresponding LSP section, to guarantee the normal operation of business.
When providing the multiple business such as above-mentioned clean culture, multicast by same MPLS network, in order to guarantee normally carrying out of business, in above two kinds of scenes between AN and AGS and need to move respectively different MPLS OAM (Operation Administration and Maintenance between AGS equipment, OAM) mechanism detects in corresponding LSP path and LSP route segment whether have fault, such as the LSP path between the LSP path between the AN1-AGS2 in Fig. 1, AN2-AGS4 in Fig. 2, the LSP path between AGS4-AGS5 etc.Because AGS4 is as VPLS fringe node, LSP carry out transmitted frame by ether destination address need to terminate, make the MPLS OAM of the intersegmental operation of Different L SP completely independent, if a certain section of LSP breaks down, the end points of other LSP section conventionally cannot perception, for example, in Fig. 3, when break down in the LSP2 path between AGS4-AGS5, if rely on the words of LSP path layer OAM, AN2 just cannot perception fault, so, when carrying out service protection, for clean culture and multicast service, can only protect respectively, and multicast service also needs to carry out segmentation LSP protection, and sectionalised protection also relate in the middle of topic between synchronous between the device node of dual homed, so protection action is very complicated.So sectionalised protection method of the prior art operating process is loaded down with trivial details, limitation is large, and for the protection mechanism disunity of clean culture and multicast service.
Based on this, packet network for list/multicast multi-service fusion of the above two kinds of technology of comprehensive employing, the embodiment of the present invention provides a kind of service protecting method and access device, by in list/multicast service, access node and aggregation node place configuring maintenance end points at service path, the continuity failure that carries out service level between maintaining end point detects, thereby without different layers in this path, the intersegmental deployment of Different L SP corresponding MPLS OAM mechanism and physical layer OAM, as long as service level continuity failure detected, no matter be clean culture or multicast service, by access node, carry out the activation to spare physical link, so that the standby pseudo-line of the standby LSP path of spare physical link bearer and the carrying of standby LSP path can be used, and the pseudo-line of the business of this business of carrying is switched on the standby pseudo-line in standby LSP path by the primary pseudo-line on primary LSP path, thereby realize the service protection under MPLS multi-service access system.The method has not only been simplified service protection process greatly, and the guard method of having unified clean culture and multicast service.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described.
Referring to Fig. 4, it is a kind of service protecting method flow chart of the embodiment of the present invention.
In the present embodiment, the business transmitting between access node and aggregation node can be that unicast service can be also multicast service.Wherein, access node can be Digital Subscriber Line Access Multiplexer (Digital Subscriber Line Access Multiplexer when copper wire access, DSLAM), when light accesses, can be optical fiber cable termination equipment (Optical Line Terminal, or adopt the access device of the support MPLS of other access technologies or multiple access technology combination OLT); Aggregation node can be the business router of a kind of MPLS of support, for example Quidway NE40 full-service router.
Before breaking down, this business is carried by the primary physical link between access node and aggregation node, and concrete is that the primary pseudo-line carrying by primary LSP path on primary physical link carries this business.For the ease of follow-up service protection, switch; in physical link between access node and aggregation node, also there is the spare physical link of primary physical link; on spare physical link, also carry corresponding standby LSP path and standby pseudo-line (as previously mentioned; when homology chummage, standby pseudo-line and primary pseudo-line can be identical).
In the present embodiment, on access node and aggregation node, dispose respectively maintaining end point (Maintenance End Point, MEP), for example, on the access node AN1 shown in Fig. 1 and aggregation node AGS2, or configuring maintenance end points on the access node AN2 shown in Fig. 2 and aggregation node AGS5, this maintaining end point can send, the OAM message such as reception and the continuous property fault detection message of the business of processing cascade and reverse fault notice, wherein, the service level continuity failure detect-message of take is example, in its pseudo-line between access node and aggregation node, transmit, the business of moving between access node and aggregation node can be Ethernet service, Y.1731 or the service level continuity failure detection protocol of 802.1ag OAM between two maintaining end points, can enable as.Two maintaining end points can be specifically the functional modules being built in respectively in access node and aggregation node, also can be separately positioned on access node and aggregation node outside and coupled, concrete mode will not enumerate, as long as can realize the service level continuity failure of carrying out on main path by two maintaining end points, detects.Wherein, service level continuity failure detect for Ethernet service be meet Y.1731, the protocol specification of any employing Ethernet header encapsulation of 802.1ag or other similar OAM(Operation Administration Maintenance)s, the path layer OAM carrying out in the different sections in LSP path in prior art is MPLS/PW OAM, for example two-way converting detects (Bidirectional Forwarding Detection, what BFD), they adopted is MPLS header encapsulation.In addition, for unicast service, conventionally adopt the point-to-point business OAM (unicast mac address that in descending OAM message, source address is aggregation node, destination address is the unicast mac address of access node), for multicast service, conventionally adopt the OAM (unicast mac address that in descending OAM message, source address is aggregation node, destination address is multicast mac address) of point-to-multipoint.In configuration, complete after above-mentioned maintaining end point, the service protecting method under this MPLS multi-service access system can comprise the following steps:
In this step, can to the maintaining end point MEP of access node, periodically send service level continuity failure detect-message (Continuity Check Message by the maintaining end point MEP from aggregation node, CCM), then the CCM message etc. that whether access node MEP receives the other side according to (such as 3.5 times to the above-mentioned cycle) in the given time verifies whether the operation of a certain business breaks down, if there is traffic failure, show to carry certain section of physical link of this business as the primary physical link of access node dual homed between access node and aggregation node, or other physical links on path, or certain node on path may break down.This service level continuity failure detects:
Access node sends service level continuity failure detect-message to aggregation node;
If receive the service level continuity failure detection response message that aggregation node returns in Preset Time, show that service operation is normal, if otherwise in Preset Time, do not receive the service level continuity failure detection response message that aggregation node sends, show that this business exists fault by aggregation node to the down direction access node; If receive the reverse fault Indication message that aggregation node sends, show that this business exists fault by access node to the up direction aggregation node.
After spare physical link activation, standby LSP path on it and standby pseudo-line get final product normal transmit traffic data frame, access node can switch to this fault business on corresponding standby pseudo-line by the primary pseudo-line that carries this business, afterwards, this business transmits by the standby pseudo-line of standby LSP carrying on spare physical link.Access node can also be further after finishing service switches, close primary physical link (it can be to the closing of physical port, or is only in logic all business data frame that receive on this link to be abandoned, and repeats no more later).
A kind of specific implementation block diagram that this protection is switched as shown in Figure 5.In figure; the OAM messages such as business OAM resume module service level continuity failure detect-message; when service level continuity failure being detected; its trigger protection is switched decision-making module; activate spare physical link (can simultaneously close primary physical link) on the one hand, on the other hand traffic frame itself is switched on the standby pseudo-line in standby LSP path in spare physical link.
The embodiment of the present invention is by list/multicast service, access node and aggregation node place configuring maintenance end points at service path, the continuity failure that carries out service level between maintaining end point detects, thereby without different layers in this path, the intersegmental deployment of Different L SP corresponding MPLS OAM mechanism and physical layer OAM, as long as service level continuity failure detected, no matter be clean culture or multicast service, by access node, carry out the activation to spare physical link, so that the standby pseudo-line of the standby LSP path of spare physical link bearer and the carrying of standby LSP path can be used, and the pseudo-line of the business of this business of carrying is switched on the standby pseudo-line in standby LSP path by the primary pseudo-line on primary LSP path, thereby realize the service protection under MPLS multi-service access system.The method has not only been simplified service protection process greatly, and the guard method of having unified clean culture and multicast service.In addition; the method does not need to depend on intermediate node and carries out service protection; can protect multiple services various faults scene; guaranteed the independence of access device; reduced the difficulty of service access configuration; not needing provides different protection mechanisms to clean culture and multicast respectively, thereby disposes more simple.
Referring to Fig. 6, it is the another kind of service protecting method flow chart of the embodiment of the present invention.
The present embodiment be take VPWS carrying unicast service and is described as example.As shown in Figure 7, between access node AN3 and aggregation node AGS7, there is primary physical link AN3-AGS8 and spare physical link AN3-AGS9.Wherein, primary physical link AN3-AGS8 is in activating operating state, and its business is carried by the primary pseudo-line PW8 on primary LSP path between AN3-AGS7, and spare physical link AN3-AGS9 is before business breaks down, in unactivated state, business letter flow cannot be used.
Y.1731 or the service level continuity failure detection protocol of 802.1ag OAM configuring maintenance end points MEP1 on access node AN3, configuring maintenance end points MEP2 on aggregation node AGS7, can enable between MEP1, MEP2 as.
This service protecting method can comprise the following steps:
MEP2 on AGS7 sends service level continuity failure detect-message (CCM) to the MEP1 (being down direction) on AN3, this detect-message transmits by pseudo-line PW8, the source address of message is the unicast mac address of AGS7, the unicast mac address that destination address is AN3.
Meanwhile, AN3 also can send service level continuity failure detect-message, the unicast mac address that the source address of message is AN1, the unicast mac address that destination address is AGS7 to AGS7 (being up direction).
If access node AN3 also sends CCM message to aggregation node AGS7, when up direction breaks down, AGS7 cannot receive the CCM message that AN3 sends within a certain period of time, now, AGS7 can send reverse fault indication (for example specific bit position in CCM message) to AN3 by the CCM message of down direction, if so AN3 receives the CCM with reverse fault indication that AGS7 sends in Preset Time, show that this business up direction exists fault.If AN3 receives the CCM message that AGS7 sends in Preset Time, and there is no reverse fault indication, show that this service operation is normal, at the equal normal operation of up-downlink direction of service path yet.For example, if AN3 does not receive any CCM message that AGS7 sends in Preset Time (3.5 CCM cycles), illustrate that this business certainly exists fault (likely also simultaneously having fault on up direction) at down direction.
This service level continuity failure detects different from the fault detect of path layer, it is without dispose different fault detection mechanisms between different layers on path, only for the service operation situation between access node and aggregation node, detect, its service level continuity failure detect-message transmits on the pseudo-line of service path, as long as there is traffic failure, AN3 all can perception, and then can judge that the physical link of this business of carrying or LSP path or intermediate node break down.
Step 402 in this activation and previous embodiment is similar, repeats no more herein.After activating reserve link AN3-AGS9, the standby LSP path on this reserve link is in upstate, and because the physical layer link between AGS9 and aggregation node AGS7 activates all the time, the LSP path of its carrying is all the time in upstate.
At access node, activate after spare physical link AN3-AGS9, can only the above-mentioned business breaking down be switched on the standby pseudo-line of standby LSP carrying in spare physical link, also can continue to carry out following steps, all business on the primary physical link of this fault business of carrying are all switched on its standby pseudo-line.
In the present embodiment, switching for the ease of all business on follow-up primary physical link, access node AN3 can the primary physical link of model on the business concordance list of all business, as shown in the table, so that when follow-up switching, can all business be switched on its standby pseudo-line one by one according to this business concordance list.
Business concordance list can adopt following form: (i, Service (i), PW (i)), wherein i is the index value of a positive integer, Service (i) and PW (i) represent respectively i business and its corresponding standby pseudo-line, or (i, Service (i), PW
main(i), PW
standby(i)), PW wherein
mainand PW (i)
standby(i) represent respectively i the corresponding primary pseudo-line of business and standby pseudo-line.Other may mode for example adopt chained list, hash or other data structures to represent that business concordance list is all possible, will not enumerate at this.
This step of setting up business concordance list can be pre-configured by management, or when the access of new business Dynamic Establishing, or just set up setting up backup path, be not construed as limiting herein.
After spare physical link activation, the all standby pseudo-line carrying on this spare physical link is in upstate, in this step, except fault business being switched to by the primary pseudo-line that carries this business the standby pseudo-line of its correspondence, other business on primary physical link can also be switched to each self-corresponding standby pseudo-line by the primary pseudo-line that carries each business.Concrete, can, according to the business of listing in business concordance list, one by one it be switched on its standby pseudo-line by the primary pseudo-line on primary physical link.
If do not perform step 604,605, and only the business breaking down is switched to standby pseudo-line by its primary pseudo-line, because primary physical link breaks down, other business on this primary physical link also there will be fault when operation, therefore, in corresponding business, repeat, after the step of above-mentioned steps 601～603, can be switched to too on standby pseudo-line corresponding to this business.
In the present embodiment, as shown in Figure 7, because this unicast service is homology chummage scene, also be after access node AN3 accesses by primary physical link and spare physical link, business is same aggregation node (for example AGS7) in MPLS network final outlet, its primary pseudo-line PW8 and standby pseudo-line PW9 are actual is the pseudo-line of same, this fault service switch process is specially: the primary pseudo-line of this business of carrying is switched to the standby LSP on spare physical link by the primary LSP on primary physical link, as shown in Figure 8, the OAM messages such as business OAM resume module service level continuity failure detect-message, when business continuance fault being detected, its trigger protection is switched decision-making module, activate on the one hand the primary physical link of spare physical link/close, directly the pseudo-line of business is switched on the other hand in spare physical link on standby LSP path.A kind of available physical link mode of closing is that all business data frame that receive on this link are abandoned.
When unicast service is that homology is not during chummage, also be that primary physical link and spare physical link all come from access node AN3, but business is different aggregation nodes in MPLS network final outlet, primary pseudo-line PW8 is different from standby pseudo-line PW9, the handoff procedure of each business that it is concrete also as shown in Figure 5, identical with handoff procedure in abovementioned steps 403.
The embodiment of the present invention is by list/multicast service; access node and aggregation node place configuring maintenance end points; the continuity failure that carries out service level between maintaining end point detects; thereby without dispose corresponding MPLS OAM and physical layer OAM between different path layers; as long as corresponding traffic failure detected; just by access node, initiatively activate spare physical link; and all business are switched to the standby pseudo-line of its correspondence by its primary pseudo-line, thereby realize the service protection under MPLS multi-service access system.The method has not only been simplified service protection process greatly, and the guard method of having unified clean culture and multicast service.
Referring to Fig. 9, it is the another kind of service protecting method flow chart of the embodiment of the present invention.
The present embodiment be take VPLS bearing multicast service and is described as example.As shown in figure 10, between access node AN4 and aggregation node AGS10, there is physical layer link AN4-AGS11-AGS10, and physical layer link AN4-AGS12-AGS10.Wherein, primary physical link AN4-AGS11 is in activating operating state, and its business is carried successively by pseudo-line PW41, the PW10 of multistage LSP path carrying between AN4 to AGS10, and spare physical link AN4-AGS12 is before business breaks down, in unactivated state, cannot use.
Y.1731 or the continuity failure detection protocol of 802.1ag OAM configuring maintenance end points MEP3 on access node AN4, configuring maintenance end points MEP4 on aggregation node AGS10, can enable between MEP3, MEP4 as.
This service protecting method can comprise the following steps:
MEP4 on AGS10 sends service level continuity failure detect-message to the MEP3 on AN4, and this detect-message transmits in pseudo-line PW41, PW10.The source address of message is the unicast mac address of AGS10, and destination address is multicast mac address.
For example, if access node MEP3 does not receive the CCM message that MEP4 sends within 3.5 cycles, determine and have traffic failure, can further determine that primary physical link exists other physical link on fault or its primary LSP path or intermediate node etc. to have fault.
AN4 activates spare physical link AN4-AGS12, and because AGS12 is (they are in same VPLS network) opened all the time to data path between AGS10, therefore, the standby LSP path on it and standby pseudo-line are in upstate.
A kind of available physical link mode of closing is that all business data frame that receive on this link are abandoned.
Step 902,903 and previous embodiment in step 602,603 similar, repeat no more herein.
When access node activates after spare physical link, according to the existing mechanism of VPLS, AGS10 can also further send MAC flush message in each end points of VPLS, thereby makes each end points re-start MAC address learning, accelerates the convergence process of VPLS business.
For multicast service, AN4 also can select to carry out igmp proxy function, on spare physical link, act on behalf of client and initiatively send IGMP group request, and between the multicast router of its direct neighbor, set up, safeguard multicast member relation, thereby make multicast service available on spare physical link.This IGMP message specifically can send by the standby pseudo-line carrying on the corresponding spare physical link of this multicast service.In another embodiment, if there is no standby pseudo-line, this IGMP message can directly send on spare physical link.
Access node is set up the business concordance list of all business on primary physical link, and according to business concordance list, all business on primary physical link is switched on corresponding standby pseudo-line.Now, because this multicast service is sent to AN4 by the pseudo-line PW42 on standby LSP path in the spare physical link between AN4-AGS12, so AN4 can receive the descending multicast service that AGS10 sends on standby pseudo-line.Wherein, the handoff procedure of each business also as shown in Figure 5, identical with the handoff procedure in abovementioned steps 403.
The embodiment of the present invention is by multicast service; access node and aggregation node place configuring maintenance end points; between maintaining end point, carry out the detection of service level continuity failure; thereby without dispose MPLS OAM and physical layer OAM between different path layers; as long as traffic failure detected; just by access node, carry out the activation to spare physical link, and all business are switched to corresponding standby pseudo-line by its primary pseudo-line, thereby realize the service protection under MPLS multi-service access system.The method has not only been simplified service protection process greatly, and the guard method of having unified clean culture and multicast service.
In the above-described embodiments, BRAS (Broadband Remote Access Server, Broadband Remote Access Server) is the convergence device AGS7/AGS10 that single-point is connected to MPLS network uplink edge.In another embodiment of the present invention, BRAS can also be linked into two different convergence devices by dual homed, as shown in figure 11.
At access node, business is switched to after standby pseudo-line, also can carry out above-mentioned service level continuity failure for the service path after switching detects, if business breaks down, can also continue to carry out according to above-described embodiment method the business switching of another standby pseudo-line.
Be more than the description for the inventive method embodiment, to realizing device and the system of said method, be introduced below.
Referring to Figure 12, it is the structural representation of a kind of access device of the embodiment of the present invention.
This access device is applied in MPLS multi-service access system, disposes and can carry out the maintaining end point that service level continuity failure detects on this access device, and this access device can comprise:
Detecting unit 1201, for and aggregation node between service path on move service level continuity failure and detect.On aggregation node, also dispose and can carry out the maintaining end point that service level continuity failure detects.Activate unit 1202, for when the continuity failure of service level being detected, activate the spare physical link of primary physical link, so that the standby LSP path on spare physical link and standby pseudo-line can be used.
Detecting unit 1201 is by sending service level continuity failure detect-message between the maintaining end point at access node and the maintaining end point of aggregation node, according to CCM message that whether receives in the given time the other side etc., verify whether there is traffic failure, and then can judge whether this business of carrying between access node and aggregation node breaks down.When the business of detecting breaks down, activate unit 1202 and abandon using primary physical link, activate spare physical link, after spare physical link activation, by switch unit 1203, this business of primary pseudo-line carrying on primary physical link is switched to the standby pseudo-line on spare physical link, afterwards, this business is carried by standby pseudo-line.
The embodiment of the present invention has realized the service protection under MPLS multi-service access system by said units; greatly simplified service protection process; the guard method of having unified clean culture and multicast service; guaranteed the independence of access device; reduced the difficulty of service access; not needing provides different protection mechanisms to clean culture and multicast respectively, thereby disposes more simple.
Referring to Figure 13, it is the structural representation of the another kind of access device of the embodiment of the present invention.
This access device can comprise detecting unit 1301, activates unit 1302 and switch unit 1303, wherein, detecting unit 1301, activate unit 1302 respectively with previous embodiment in detecting unit 1201, to activate unit 1202 similar, repeat no more herein.
In the present embodiment, Y.1731 detecting unit 1301 specifically for enabling or the service level continuity failure of 802.1ag OAM detects between access device and aggregation node.
Switch unit 1303 can comprise again:
Create subelement 13031, for setting up the business concordance list of all business on primary physical link.
Switch subelement 13032, for each business on primary physical link being switched to corresponding standby pseudo-line by the primary pseudo-line that carries respectively each business according to business concordance list.
When this business is unicast service and homology chummage, primary pseudo-line and standby pseudo-line are same pseudo-line, so switch unit specifically can be for being directly switch into the standby LSP on described spare physical link by the primary pseudo-line of the described business of carrying by the primary LSP on described primary physical link.
In another embodiment, for multicast service, this access device can also comprise request transmitting unit, for before the business breaking down is switched to standby pseudo-line by the primary pseudo-line that carries this business, by standby pseudo-line, on spare physical link, send Internet Group Management Protocol IGMP group request message.
In another embodiment, this access device can further include closing unit, for described the business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business after, close described primary physical link.
The embodiment of the present invention has realized the service protection under MPLS multi-service access system by said units; greatly simplified service protection process; the guard method of having unified clean culture and multicast service; guaranteed the independence of access device; reduced the difficulty of service access; not needing provides different protection mechanisms to clean culture and multicast respectively, thereby disposes more simple.
Referring to Figure 14, it is the structural representation of a kind of MPLS multi-service access system of the embodiment of the present invention.
This system can comprise access device 1401 and convergence device 1402.
Wherein, access device 1401, for and convergence device 1402 between service path on move service level continuity failure and detect, on described access device, dispose and can carry out the maintaining end point that described service level continuity failure detects; When the continuity failure of service level being detected, activate the spare physical link of primary physical link, so that the standby LSP path on described spare physical link and standby pseudo-line can be used; The business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business, wherein, described primary pseudo-line is the pseudo-line that carry in the primary LSP path on described primary physical link, and described standby pseudo-line is the pseudo-line that carry in the standby LSP path on described spare physical link.
This system has been simplified service protection process greatly; the guard method of having unified clean culture and multicast service, has guaranteed the independence of access device, has reduced the difficulty of service access; not needing provides different protection mechanisms to clean culture and multicast respectively, thereby disposes more simple.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (10)
1. a service protecting method, is characterized in that, comprising:
On the service path between access node and aggregation node, move service level continuity failure and detect, on described access node and described aggregation node, dispose and can carry out the maintaining end point that described service level continuity failure detects;
When described access node detects the continuity failure of service level, described access node activates the spare physical link of primary physical link, so that the standby label switching path LSP path on described spare physical link and standby pseudo-line can be used; Described primary physical link is connected between described access node and described aggregation node;
The business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business, wherein, described primary pseudo-line is the pseudo-line that carry in the primary LSP path on described primary physical link, and described standby pseudo-line is the pseudo-line that carry in the standby LSP path on described spare physical link.
2. method according to claim 1, is characterized in that, described the business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business, comprising:
Described access node is set up the business concordance list of all business on described primary physical link;
According to described business concordance list, each business on described primary physical link is switched to corresponding standby pseudo-line by the primary pseudo-line that carries respectively each business.
3. method according to claim 1, is characterized in that, when described business is multicast service, described the business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business before, also comprise:
Described access node sends Internet Group Management Protocol IGMP request message by described standby pseudo-line on described spare physical link.
4. method according to claim 1, it is characterized in that, when described business is unicast service and homology chummage, described primary pseudo-line and described standby pseudo-line are same pseudo-line, described the business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business, is specially:
The primary pseudo-line of the described business of carrying is switched to the standby LSP path on described spare physical link by the primary LSP path on described primary physical link.
5. according to the method described in any one in claim 1 to 4, it is characterized in that, also comprise:
Described the business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business after, close described primary physical link.
6. an access device, is characterized in that, comprising:
Detecting unit, for and aggregation node between service path on move service level continuity failure and detect, on described access device and described aggregation node, dispose and can carry out the maintaining end point that described service level continuity failure detects;
Activate unit, for when the continuity failure of service level being detected, activate the spare physical link of primary physical link, so that the standby LSP path on described spare physical link and standby pseudo-line can be used; Described primary physical link is connected between described access device and described aggregation node;
Switch unit, for the business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business, wherein, described primary pseudo-line is the pseudo-line that carry in the primary LSP path on described primary physical link, and described standby pseudo-line is the pseudo-line that carry in the standby LSP path on described spare physical link.
7. access device according to claim 6, is characterized in that, described switch unit comprises:
Create subelement, for setting up the business concordance list of all business on described primary physical link;
Switch subelement, for each business on described primary physical link being switched to corresponding standby pseudo-line by the primary pseudo-line that carries respectively each business according to described business concordance list.
8. access device according to claim 6, is characterized in that, also comprises:
Request transmitting unit, for when described business is multicast service, before the business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business, by described standby pseudo-line, on described spare physical link, send IGMP group request message.
9. access device according to claim 6, is characterized in that,
Described switch unit, when being unicast service and homology chummage when described business, described primary pseudo-line and described standby pseudo-line are same pseudo-line, the primary pseudo-line of the described business of carrying are switched to the standby LSP path on described spare physical link by the primary LSP path on described primary physical link.
10. according to the access device described in any one in claim 6 to 9, it is characterized in that, also comprise:
Closing unit, for described the business breaking down is switched to described standby pseudo-line by the primary pseudo-line that carries described business after, close described primary physical link.
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| PCT/CN2011/074683 WO2011144088A2 (en) | 2011-05-26 | 2011-05-26 | Method for service protection and access device |
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| CN102447569B (en) * | 2011-12-29 | 2015-06-03 | 中兴通讯股份有限公司 | Protection method for point-to-multipoint multicast service and network equipment |
| CN104426691B (en) * | 2013-08-26 | 2018-02-13 | 华为技术有限公司 | Fault handling method, aggregation gateway and wireless side gateway |
| CN103916270B (en) * | 2014-03-21 | 2017-06-13 | 烽火通信科技股份有限公司 | The system for realizing Link State Pass Through function based on PTN, method and device |
| CN106452813B (en) * | 2015-08-10 | 2020-05-29 | 中兴通讯股份有限公司 | Method, device and system for packet transport network hybrid configuration dual-homing protection switching |
| CN109495320B (en) * | 2018-12-24 | 2021-12-24 | 新华三技术有限公司 | Data message transmission method and device |
| JP2023541706A (en) * | 2020-09-21 | 2023-10-03 | 華為技術有限公司 | Methods, devices, and systems for performing service path discovery |
| CN113472642B (en) * | 2021-06-10 | 2023-06-13 | 新华三信息安全技术有限公司 | Protection switching method and device |
| CN115208714A (en) * | 2022-05-23 | 2022-10-18 | 浪潮通信技术有限公司 | Network link determining method, device, system, electronic equipment and storage medium |
| CN116232985A (en) * | 2022-12-23 | 2023-06-06 | 中国联合网络通信集团有限公司 | Route planning method, device and storage medium |
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| CN1964249A (en) * | 2006-10-20 | 2007-05-16 | 华为技术有限公司 | A method and device to realize punch-through of point-to-multipoint network link status |
| CN102035681A (en) * | 2010-12-17 | 2011-04-27 | 中兴通讯股份有限公司 | Link protection method and system for virtual private network |
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