CN106452813B - Method, device and system for packet transport network hybrid configuration dual-homing protection switching - Google Patents

Method, device and system for packet transport network hybrid configuration dual-homing protection switching Download PDF

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CN106452813B
CN106452813B CN201510486106.1A CN201510486106A CN106452813B CN 106452813 B CN106452813 B CN 106452813B CN 201510486106 A CN201510486106 A CN 201510486106A CN 106452813 B CN106452813 B CN 106452813B
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CN106452813A (en
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张雷
钱玉多
程兵旺
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ZTE Corp
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ZTE Corp
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract

The invention provides a method, a device and a system for dual-homing protection switching of mixed configuration of a packet transport network; the method comprises the following steps: and comparing the consistency of the main and standby information of the network side cross-frame pseudo wire MC-PW protection group on the home node with the main and standby information of the access link side cross-frame linear multiplexing segment MC-LMSP protection group or the main and standby cross-frame link MC-LAG aggregation group to obtain a comparison result, and managing the dual-homing protection bridging or switching according to the comparison result.

Description

Method, device and system for packet transport network hybrid configuration dual-homing protection switching
Technical Field
The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for dual-homing protection switching in a packet transport network.
Background
With the rapid spread of 3G networks in China, a Packet Transport Network (PTN) technology is in progress, operators represented by china mobile rapidly deploy the largest global PTN Network in metropolitan area networks and provincial backbone networks, newly built 2G/3G/4G services (base stations) are mostly borne on the PTN Network, and the original 2G services (base stations) are also gradually migrated from SDH (Synchronous Digital Hierarchy) networks to PTN networks.
In a metropolitan area PTN network, linear protection has an inherent defect that a core ground node PE (Provider Edge, core layer operator carrying network Edge device) fails (for example, the core ground PE device fails) and service is fully blocked, so telecommunications operators represented by china mobile have proposed a requirement for PTN dual-homing protection.
The PTN equipment of each manufacturer generally supports the cooperation of linear protection and access link protection in the PTN network to realize a dual-homing protection mechanism, which is strongly pulled by the needs of operators.
Fig. 1 is a schematic diagram of a dual homing protection network in a PTN in the prior art.
As shown in fig. 1, linear protection in the PTN network is completed by combining a working PW or a protection PW and a DNI-PW (Dual-Node-interconnection Pseudo wire) with a PW protection group on an access layer operator carrier edge device, by using a Multi-Chassis Pseudo wire (Multi-Chassis Pseudo wire) on a main core landing point (main home Node) PE-a and a PE-B.
For the case that the access link is an SDH link, the access link Protection is completed by matching the MC-LMSP (Multi-sessions linear multiplexing Section Protection) on the host and standby core landing points (host and standby home nodes) PE-a and PE-B with the LMSP (linear multiplexing Section Protection) on the CE (client Edge, bearer network client Edge device).
For the case that the access Link is an ethernet Link, the access Link protection is completed by matching a master/slave MC-LAG Aggregation Group (Multi-sessions Link Aggregation Group) on the master/slave core anchor point (master/slave home node) PE-a and PE-B with a master/slave LAG Aggregation Group (Link Aggregation Group) on the CE.
The main and standby state synchronization and data synchronization of The network side MC-PW protection group and The access link side MC-LMSP/main and standby MC-LAG protection group on The main and standby core ground points (main and standby home nodes) PE-A and PE-B are realized by a cross-rack communication Protocol (ICCP) defined by an IETF (Internet engineering Task Force, International Internet engineering Task Force) working group manuscript 'Interch-communication Protocol for L2VPN PE reduce'.
In engineering application, an operator needs to reduce the influence of faults in a PTN network or access link faults on network services, and requires that a main core floor point (main home node) of a part of services (base stations) such as PE-1-PE-N is PE-A, and a standby core floor point (standby home node) is PE-B; the main core landing point (main home node) of another part of services (base stations) such as PE- (N +1) -PE-2N is PE-B, and the standby core landing point (standby home node) is PE-A; therefore, once a fault in the PTN network or a fault of an access link occurs, the influence of the whole network service cannot occur, and the network fluctuation scale is greatly reduced. In addition, in some operators with a low engineering operation and maintenance level, a main core landing point (main home node) of a part of services (base stations) caused by mis-configuration is PE-a, and a standby core landing point (standby home node) is PE-B; the case occurs where the primary core landing point (primary home node) of the other part of the traffic (base station) is PE-B and the backup core landing point (backup home node) is PE-a.
Based on this, the telecommunications industry has developed the application requirement of dual homing protection for PTN hybrid configurations. Fig. 2 is a schematic diagram of a PTN hybrid configuration dual homing protection network.
As shown in fig. 2, for PTN dual homing protection, the primary and secondary attributes of the core ground node are determined by the primary and secondary attributes of the MC-PW protection group on the network side; the main and standby attributes of the MC-LMSP/main and standby MC-LAG protection group on the core landing node access side are determined by the main and standby attributes of the LMSP/main and standby LAG on the CE.
PTN dual homing protection for non-hybrid configurations: the main and standby attributes of all service (base station) core landing nodes are consistent with the main and standby attributes of the network side MC-PW protection group and the access link side MC-MSP/main and standby MC-LAG protection group.
PTN dual homing protection for hybrid configurations: because a part of MC-PW protection group main and standby core grounding points (main and standby home nodes) are PE-A (main) and PE-B (standby) respectively; the main and standby core landing points (main and standby home nodes) of the other part of MC-PW protection group are respectively PE-B (main) and PE-A (standby); the main and standby attributes of a part of service (base station) core landing points (home nodes) are consistent with the main and standby attributes of the MC-MSP/main and standby MC-LAG protection group, and the main and standby attributes of the other part of service (base station) core landing points (home nodes) are inconsistent with the main and standby attributes of the MC-MSP/main and standby MC-LAG protection group and are just opposite.
Particularly, for the case of using the load sharing LAG/load sharing MC-LAG for access link side protection, it is only necessary to keep the primary/secondary attributes of the core landing node consistent with the primary/secondary attributes of the MC-PW protection group on the network side, and there is no problem that the primary/secondary attributes of the core landing node (home node) are inconsistent with the primary/secondary attributes of the access link side protection. For the case of 4G service bearer, the problem that the primary and secondary protection attributes of the core floorpoint (home node), i.e., the two-Layer and three-Layer bridging points, are inconsistent with the L3VPN (Layer 3virtual private Network) does not exist.
By search and analysis, no solution for the above-mentioned PTN hybrid configuration dual homing protection application requirement exists in the telecommunications industry at present.
Disclosure of Invention
The invention aims to provide a method, a device and a system for dual homing protection of PTN hybrid configuration, so as to solve the protection requirement of dual homing service hybrid configuration application in PTN engineering deployment.
In order to solve the technical problems, the invention provides the following technical scheme:
a method for dual homing protection of hybrid configuration of a packet transport network comprises the following steps:
comparing the master and slave information of the network side cross-frame pseudo wire MC-PW protection group on the home node with the master and slave information of the access link side cross-frame linear multiplexing segment MC-LMSP protection group or the master and slave cross-frame link MC-LAG aggregation group to obtain a comparison result;
and managing the dual-homing protection bridging or switching according to the comparison result.
Wherein, according to the comparison result, managing the dual-homing protection bridging or switching comprises:
if the comparison result is consistent, directly entering a bridging flow or a switching flow;
and if the comparison result is inconsistent, negating the decision result of the access link side MC-LMSP protection group or the main/standby MC-LAG protection group, and entering a bridging flow or a switching flow according to the negated result.
According to the comparison result, negating the decision result of the access link side MC-LMSP protection group or the main/standby MC-LAG protection group comprises the following steps:
when the access link is a Synchronous Digital Hierarchy (SDH) link, the protection group connected with the CE is an MC-LMSP protection group, and if the decision result of the MC-LMSP protection group is that the service is in a working unit, the result obtained after negating the decision result is that the service is in a protection unit; if the decision result of the MC-LMSP protection group is that the service is in the protection unit, the result obtained by negating the decision result is that the service is in the working unit;
when the access link is an Ethernet link, the protection group connected with the CE is a main and standby MC-LAG aggregation group, if the aggregation state decision result of the main and standby MC-LAG is that the main link aggregation state and the standby link aggregation state are respectively started and stopped, the result after negating the decision result is that the main link aggregation state and the standby link aggregation state are respectively stopped and started; and if the aggregation state decision result of the main and standby MC-LAGs is that the aggregation state of the main link and the aggregation state of the standby link are respectively stop and start, the result obtained after negating the decision result is that the aggregation state of the main link and the aggregation state of the standby link are respectively start and stop.
Wherein the entering the bridging procedure comprises:
and managing the bridging relation among the network side PW, the double-node interconnection pseudowire DNI-PW and the access link.
An apparatus of PTN hybrid configuration dual homing protection, comprising:
the comparison module is used for comparing the consistency of the main and standby information of the MC-PW protection group on the network side of the home node with the main and standby information of the MC-LMSP protection group on the access link side or the MC-LAG aggregation group of the main and standby cross-frame links to obtain a comparison result;
and the management module is used for managing the dual-homing protection bridging or switching according to the comparison result.
Wherein the management module is specifically configured to:
if the comparison result is consistent, directly entering a bridging flow or a switching flow;
and if the comparison result is inconsistent, negating the decision result of the access link side MC-LMSP protection group or the main/standby MC-LAG protection group, and entering a bridging flow or a switching flow according to the negated result.
Wherein, the said management module negating the decision result of the protection group connected with CE includes:
when the access link is an SDH link, the protection group connected with the CE is an MC-LMSP protection group, if the decision result of the MC-LMSP protection group is that the service is in the working unit, the result obtained after negating the decision result is that the service is in the protection unit; if the decision result of the MC-LMSP protection group is that the service is in the protection unit, the result obtained by negating the decision result is that the service is in the working unit;
when the access link is an Ethernet link, the protection group connected with the CE is a main and standby MC-LAG aggregation group, if the aggregation state decision result of the main and standby MC-LAG is that the main link aggregation state and the standby link aggregation state are respectively started and stopped, the result after negating the decision result is that the main link aggregation state and the standby link aggregation state are respectively stopped and started; and if the aggregation state decision result of the main and standby MC-LAGs is that the aggregation state of the main link and the aggregation state of the standby link are respectively stop and start, the result obtained after negating the decision result is that the aggregation state of the main link and the aggregation state of the standby link are respectively start and stop.
Wherein the management module is specifically configured to:
and managing the bridging relation among the PW, the DNI-PW and the access link at the network side.
A system for PTN hybrid configuration dual homing protection switching, comprising:
the edge device of the access layer operator carrying network is used for monitoring the alarm states of the working link and the protection link, carrying out switching operation on the link according to the alarm information and updating the switching state of the PW protection group;
an edge device of a core layer operator bearer network, comprising any one of the above-described apparatus;
the edge device at the client side of the bearer network is used for monitoring the alarm states of the working link and the protection link or the alarm states of the working multiplexing section and the protection multiplexing section at the access link side, performing the LMSP or main/standby LAG protection group switching action according to the alarm and protocol states and updating the LMSP or main/standby LAG protection group switching state.
According to the embodiment provided by the invention, the comparison result is obtained by comparing the master/slave information of the MC-PW protection group at the network side on the attribution node with the master/slave information of the MC-LMSP protection group or the master/slave MC-LAG aggregation group connected with the CE at the access link side, and the bridging or switching of the dual-homing protection is managed according to the comparison result, so that the protection requirement of the dual-homing service mixed configuration application in the PTN engineering deployment is realized.
Drawings
Fig. 1 is a schematic diagram of a PTN dual homing protection network in the prior art;
fig. 2 is a schematic diagram of a PTN hybrid configuration dual homing protection network;
FIG. 3 is a flow chart of a method of hybrid configuration dual homing protection provided by the present invention;
fig. 4 is a schematic diagram of a service path when PTN hybrid configuration dual-homing protection provided in the first embodiment of the present invention has no fault;
fig. 5 is a schematic diagram of a service path of a PTN hybrid configuration dual-homing protection network side failure (one) according to a second embodiment of the present invention
Fig. 6 is a schematic diagram of a service path of a PTN hybrid configuration dual-homing protection network side failure (two) according to a third embodiment of the present invention
Fig. 7 is a schematic diagram of a service path with a failure (one) on the side of a PTN hybrid configuration dual-homing protection access link according to a fourth embodiment of the present invention
Fig. 8 is a schematic diagram of an atypical application service path with PTN hybrid configuration dual homing protection according to a fifth embodiment of the present invention
Fig. 9 is a schematic diagram of a service path when a PTN hybrid configuration dual-homing protection dry-less application scenario provided by a sixth embodiment of the present invention has no fault;
fig. 10 is a block diagram of a device for dual homing protection in a PTN hybrid configuration provided by the present invention;
fig. 11 is a structural diagram of a system for PTN hybrid configuration dual homing protection provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Fig. 3 is a flowchart of a method for PTN hybrid configuration dual homing protection provided by the present invention. The method shown in fig. 3 comprises:
step 301, comparing the master/slave information of the MC-PW protection group at the home node side with the master/slave information of the MC-LMSP protection group or the master/slave MC-LAG aggregation group connected with the CE at the access link side to obtain a comparison result;
step 302, according to the comparison result, managing the dual homing protection bridging or switching.
The method obtains a comparison result by comparing the master/slave information of the MC-PW protection group at the home node side with the master/slave information of the MC-LMSP protection group or the master/slave MC-LAG aggregation group at the access link side connected with the CE, and manages the bridging or switching of the dual-home protection according to the comparison result, thereby realizing the protection requirement of the dual-home service mixed configuration application in the PTN engineering deployment.
The method provided by the present invention is further illustrated below:
the main and standby attributes of the MC-PW protection group are determined according to the following principle: an MC-PW protection group consisting of the working PW and the DNI-PW is a main group, and an MC-PW protection group consisting of the protection PW and the DNI-PW is a standby group.
The main and standby attributes of the protection link connected with the CE at the access link side are determined according to the following principle:
the link between the MC-LMSP/main/standby MC-LAG and the CE is LMSP/MC-LMSP or the MC-LMSP/main/standby MC-LAG protection attribute of a core landing point (home node) of a main/standby LAG/main/standby MC-LAG working link is taken as a main;
the link between the CE and the link is LMSP/MC-LMSP or MC-LMSP/MC-LAG protection attribute of a core landing point (home node) of the main/standby LAG protection link is standby.
Wherein, according to the comparison result, managing the dual-homing protection bridging or switching comprises:
if the comparison result is consistent, directly entering a bridging flow or a switching flow;
and if the comparison result is inconsistent, negating the decision result of the MC-LMSP protection group or the main/standby MC-LAG aggregation group, and entering a bridging flow or a switching flow according to the negated result.
Specifically, if the comparison result is consistent, the PTN dual homing protection is represented as a non-hybrid configuration; and if the comparison result is inconsistent, indicating the PTN double-homing protection of the mixed configuration.
For PTN dual homing protection of non-hybrid configuration, the dual homing protection management is carried out according to the comparison result, and the operation accuracy is improved.
The negating of the decision result of the MC-LMSP protection group or the active/standby MC-LAG aggregation group connected with the CE includes:
when the access link is an SDH link, the protection group connected with the CE is a main MC-LMSP protection group, if the decision result of the MC-LMSP protection group is that the service is in the working unit, the result after negating the decision result is that the service is in the protection unit; if the decision result of the MC-LMSP protection group is that the service is in the protection unit, the result obtained by negating the decision result is that the service is in the working unit;
when the access link is an Ethernet link, the protection group connected with the CE is a master/slave MC-LAG aggregation group, if the aggregation state decision result of the master/slave cross-rack link aggregation group MC-LAG is that the aggregation state of the master link and the aggregation state of the slave link are respectively started and stopped, the result after negating the decision result is that the aggregation state of the master link and the aggregation state of the slave link are respectively stopped and started; and if the aggregation state decision result of the main and standby MC-LAGs is that the aggregation state of the main link and the aggregation state of the standby link are respectively stop and start, the result obtained after negating the decision result is that the aggregation state of the main link and the aggregation state of the standby link are respectively start and stop.
Wherein the entering the bridging procedure comprises: and managing the bridging relation among the network side PW, the double-node interconnection pseudowire DNI-PW and the access link.
The above process is further illustrated by the following examples:
the first embodiment is as follows: no fault condition:
firstly, determining whether the master/slave attributes of a core landing point (home node) are consistent with the master/slave attributes of an access link side;
secondly, if the comparison results are consistent, directly entering the original bridging process; and if not, negating the decision result of the access side MC-LMSP/main/standby MC-LAG protection, and entering the original bridging flow according to the negation result to complete bridging to realize normal forwarding of the service flow.
Fig. 4 is a schematic diagram of a service path when the PTN hybrid configuration dual-homing protection of the present invention has no failure.
For the services of 'PE-1-PE-N', the core floorstand point (home node) main/standby attribute is consistent with the main/standby attribute of the access link side, and the services directly enter the original bridging process, and normal forwarding of service flow can be realized after bridging is completed; the service path is 'Access stratum operator carrying net edge device (PE-1-PE-N)' core layer operator carrying net edge device (PE-A) 'carrying net customer edge device (CE)'.
For the services of 'PE- (N +1) -PE-2N', the core floorstand point (home node) main/standby attribute is inconsistent with the main/standby attribute of the access link side, the decision result of access side MC-LMSP/main/standby MC-LAG protection needs to be negated, and the original bridging process is entered according to the negation result, so that normal forwarding of service flow can be realized only after bridging is completed; the service path is ' access stratum operator load network edge equipment (PE- (N +1) -PE-2N) ' core layer operator load network edge equipment (PE-B) ' core layer operator load network edge equipment (PE-A) ' load network customer edge equipment (CE) '.
It should be noted that, if the method of the present invention is not used, the services "PE- (N +1) -PE-2N" cannot be forwarded normally.
Example two: PTN network side failure (one) case:
firstly, determining whether the master/slave attributes of a core landing point (home node) are consistent with the master/slave attributes of an access link side;
step two, if the comparison result is consistent, directly entering the original switching process; and if the two types of the data are not consistent, negating the decision result of the access side MC-LMSP/main/standby MC-LAG protection, and entering the original switching flow according to the negation result to realize the end-to-end protection of the service flow.
Fig. 5 is a schematic diagram of a service path after switching is completed when a PTN hybrid configuration dual-homing protection network side fails (one).
The 'network side failure (one)' means that a link between 'access layer operator load network edge equipment (PE-1 to PE-2N)' and 'core layer operator load network edge equipment (PE-A)' has a failure.
For the services of 'PE-1-PE-N', the MC-PW protection group is switched due to a network side fault (I), and the original switching process is directly entered because the main/standby attributes of the core floorpoint (home node) are consistent with the main/standby attributes of the access link side, so that the end-to-end protection of the services can be realized by completing the switching. The service path is ' access stratum operator load network edge equipment (PE-1-PE-N) ' core layer operator load network edge equipment (PE-B) ' core layer operator load network edge equipment (PE-A) ' load network customer edge equipment (CE) '.
For the service of "PE- (N +1) -PE-2N", the network side failure (one) has no influence on it, which is also one of the advantages of the operators mentioned in the background section of the present application in selecting the hybrid configuration dual-homing protection.
It should be noted that, if the method of the present invention is not used, the services "PE- (N +1) -PE-2N" cannot be forwarded normally.
Example three: PTN network side failure (two) case:
firstly, determining whether the master/slave attributes of a core landing point (home node) are consistent with the master/slave attributes of an access link side;
step two, if the comparison result is consistent, directly entering the original switching process; and if the two types of the data are not consistent, negating the decision result of the access side MC-LMSP/main/standby MC-LAG protection, and entering the original switching flow according to the negation result to realize the end-to-end protection of the service flow.
Fig. 6 is a schematic diagram of a service path after switching is completed when a PTN hybrid configuration dual-homing protection network side fails (two).
The 'network side failure (two)' means that a link between 'access layer operator load network edge equipment (PE-1 to PE-2N)' and 'core layer operator load network edge equipment (PE-B)' fails.
For the services of 'PE-1 to PE-2N', the network side fault (II) has no influence on the services, which is also one of the advantages of the operators in the background part of the invention in selecting the hybrid configuration dual homing protection.
For the services of 'PE- (N +1) -PE-2N', the MC-PW protection group is switched due to a fault (II), the decision result of access side MC-LMSP/main/standby MC-LAG protection needs to be negated because the main/standby attribute of the core floorpoint (home node) is inconsistent with the main/standby attribute of the access link side, and then the switching process is entered according to the negated result, so that the switching is completed to realize the end-to-end protection of the services. The service path is 'access stratum operator carrying network edge equipment (PE- (N +1) -PE-2N)' core layer operator carrying network edge equipment (PE-A) 'carrying network customer edge equipment (CE)'.
It should be noted that, if the method of the present invention is not used, the normal forwarding and the forwarding after the protection switching cannot be realized for the service of "PE- (N +1) -PE-2N".
Example four: access link side failure (one) case:
firstly, determining whether the master/slave attributes of a core landing point (home node) are consistent with the master/slave attributes of an access link side;
step three, if the comparison result is consistent, directly entering the original switching process; and if the two types of the data are not consistent, negating the decision result of the access side MC-LMSP/main/standby MC-LAG protection, and entering the original switching flow according to the negation result to realize the end-to-end protection of the service flow.
Fig. 7 is a schematic diagram of a service path after switching is completed when a PTN hybrid configuration dual-homing protection access link side fails (one) according to the present invention.
The 'access side failure (one)' means that the working link of LMSP/MC-LMSP or main/standby LAG/MC-LAG between the edge device (home node) of the core layer operator load-bearing network and CE is failed.
For the services of 'PE-1 to PE-N', when the access side fails (one), the MC-LMSP/MC-LAG needs to check back the corresponding MC-PW protection group, the MC-PW protection group determines that the main/standby attribute of the core landing point (home node) is consistent with the main/standby attribute of the access link side, and the MC-PW protection group directly enters the original switching process to complete the switching so as to realize the end-to-end protection of the services. The service path is ' access stratum operator load network edge equipment (PE-1-PE-N) ' core layer operator load network edge equipment (PE-A) ' core layer operator load network edge equipment (PE-B) ' load network customer edge equipment (CE) '.
For the services of 'PE- (N +1) -PE-2N', when the access side fails (one), the MC-LMSP/MC-LAG is required to check back the corresponding MC-PW protection group, the MC-PW protection group determines that the main/standby attribute of the core landing point (home node) is inconsistent with the main/standby attribute of the access link side, the MC-LMSP/main/standby MC-LAG protection decision result is required to be negated, and then the switching flow is entered according to the negation result to complete the switching to realize the end-to-end protection of the services. The service path is 'access stratum operator carrying network edge equipment (PE- (N +1) -PE-2N)' core layer operator carrying network edge equipment (PE-B) 'carrying network customer edge equipment (CE)'.
It should be noted that, if the method of the present invention is not used, the normal forwarding and the forwarding after the protection switching cannot be realized for the service of "PE- (N +1) -PE-2N".
Example five: atypical application of PTN mixed configuration dual-homing protection
Firstly, determining whether the main/standby attributes of core landing points (home nodes) (different services coming from the same site) are consistent with the main/standby attributes of an access link side;
step three, if the comparison result is consistent, directly entering the original switching process; and if the two types of the data are not consistent, negating the decision result of the access side MC-LMSP/main/standby MC-LAG protection, and entering the original switching flow according to the negation result to realize the end-to-end protection of the service flow.
Fig. 8 is a schematic diagram of PTN hybrid configuration dual homing protection, an atypical application traffic path.
The "PTN hybrid configuration dual homing protection an atypical application" mainly refers to a plurality of services (fig. 8 only uses two services for a representative schematic illustration), which are accessed from the same "access stratum operator bearer network edge device", and the services are in hybrid configuration, that is, the main and standby core landing points (main and standby home nodes) of a part of services are PE-a (main) and PE-B (standby), respectively, and the main and standby core landing points (main and standby home nodes) of another part of services are PE-B (main) and PE-a (standby), respectively.
The service types of multiple services accessed from the same "access stratum operator carrier network edge device" may be the same, such as all TDM circuit emulation services or all ethernet services, or may be different, such as a part of TDM circuit emulation services and a part of ethernet services.
It should be noted that, if the method of the present invention is not used, the service configured in a mixed manner on the same "access stratum operator edge device" cannot implement normal forwarding and forwarding after protection switching.
Example six: the PTN mixed configuration dual-homing protection dry-saving application scene has no fault condition:
in the example, the provincial trunk network and the metropolitan area network are butted by adopting MC-LMSP/main and standby MC-LAG. The main and standby attributes of the core landing point (home node) access link side of the metropolitan area network A or the metropolitan area network B are determined by the main and standby attributes of MC-LMSP/main and standby MC-LAG which are butted by the metropolitan area network and the province-backbone network, the working link is the main, and the protection link is the standby.
Step one, a metropolitan area network A or a metropolitan area network B respectively determines whether the master/slave attributes of a core floor point (home node) are consistent with the master/slave attributes of an access link side;
secondly, if the comparison results are consistent, directly entering the original bridging process; and if not, negating the decision result of the access side MC-LMSP/main/standby MC-LAG protection, and entering the original bridging flow according to the negation result to complete bridging to realize normal forwarding of the service flow.
Fig. 9 is a schematic diagram of a service path when the PTN hybrid configuration dual-homing protection dry-save application scenario of the present invention has no failure.
For the services of 'PE-1-PE-N', the core floorstand point (home node) main/standby attribute is consistent with the main/standby attribute of the access link side, and the services directly enter the original bridging process, and normal forwarding of service flow can be realized after bridging is completed; the service path is ' metropolitan area network A access layer operator carrying network edge equipment (PE-1-PE-N) ' metropolitan area network A core layer operator carrying network edge equipment (PE-A) ' provincial trunk operator carrying network edge equipment PE-C1 ' provincial trunk operator carrying network edge equipment PE-D1 ' metropolitan area network B core layer operator carrying network edge equipment (PE-A) ' metropolitan area network B access layer operator carrying network edge equipment (PE-1-PE-N) '.
For the services of 'PE- (N +1) -PE-2N', the core floorstand point (home node) main/standby attribute is inconsistent with the main/standby attribute of the access link side, the decision result of access side MC-LMSP/main/standby MC-LAG protection needs to be negated, and the original bridging process is entered according to the negation result, so that normal forwarding of service flow can be realized only after bridging is completed; the service path is ' metropolitan area network A access layer operator carrying network edge equipment (PE- (N +1) -PE-2N) ' metropolitan area network A core layer operator carrying network edge equipment (PE-B) ' metropolitan area network A core layer operator carrying network edge equipment (PE-A) ' provincial trunk operator carrying network edge equipment PE-C1 ' provincial trunk operator carrying network edge equipment PE-D1 ' metropolitan area network B core layer operator carrying network edge equipment (PE-A) ' metropolitan area network B core layer operator carrying network edge equipment (PE-B) ' metropolitan area network B access layer operator carrying network edge equipment (PE- (N +1) -PE-2N ').
It should be noted that, if the method of the present invention is not used, the normal forwarding across the backhaul network cannot be implemented for the service of "PE- (N +1) -PE-2N".
Fig. 10 is a structural diagram of a device for PTN hybrid configuration dual homing protection provided by the present invention. The apparatus shown in fig. 10 comprises:
a comparison module 1001, configured to compare master/slave information of an MC-PW protection group on a network side of a home node with master/slave information of an MC-LMSP protection group or a master/slave MC-LAG aggregation group on an access link side, to obtain a comparison result;
a management module 1002, configured to manage dual-homing protection bridging or switching according to the comparison result.
The management module 1002 is specifically configured to:
if the comparison result is consistent, directly entering a bridging flow or a switching flow;
and if the comparison result is inconsistent, negating the decision result of the access link side MC-LMSP protection group or the main/standby MC-LAG protection group, and entering a bridging flow or a switching flow according to the negated result.
Wherein, the negating of the decision result of the protection group connected with the CE by the management module 1002 includes:
when the access link is an SDH link, the protection group connected with the CE is an MC-LMSP protection group, if the decision result of the MC-LMSP protection group is that the service is in the working unit, the result obtained after negating the decision result is that the service is in the protection unit; if the decision result of the MC-LMSP link is that the service is in the protection unit, the result obtained after negating the decision result is that the service is in the working unit;
when the access link is an Ethernet link, the protection group connected with the CE is a main and standby MC-LAG aggregation group, if the aggregation state decision result of the main and standby MC-LAG is that the main link aggregation state and the standby link aggregation state are respectively started and stopped, the result after negating the decision result is that the main link aggregation state and the standby link aggregation state are respectively stopped and started; and if the aggregation state decision result of the main and standby MC-LAGs is that the aggregation state of the main link and the aggregation state of the standby link are respectively stop and start, the result obtained after negating the decision result is that the aggregation state of the main link and the aggregation state of the standby link are respectively start and stop.
The management module 1002 is specifically configured to: and managing the bridging relation among the PW, the DNI-PW and the access link at the network side.
The device provided by the invention obtains a comparison result by comparing the master/slave information of the MC-PW protection group at the home node side with the master/slave information of the MC-LMSP protection group or the master/slave MC-LAG aggregation group connected with the CE at the access link side, and manages the bridging or switching of the dual-home protection according to the comparison result, thereby realizing the protection requirement of the dual-home service mixed configuration application in the PTN engineering deployment.
Fig. 11 is a structural diagram of a system for PTN hybrid configuration dual homing protection provided by the present invention. The system shown in fig. 11 includes:
the edge device of the access layer operator carrying network is used for monitoring the alarm states of the working link and the protection link, carrying out switching operation on the link according to the alarm information and updating the switching state of the PW protection group;
an edge device of a core layer operator bearer network, comprising any one of the above-described apparatus;
the edge device at the client side of the bearer network is used for monitoring the alarm states of the working link and the protection link or the alarm states of the working multiplexing section and the protection multiplexing section at the access link side, performing the LMSP or main/standby LAG protection group switching action according to the alarm and protocol states and updating the LMSP or main/standby LAG protection group switching state.
The system provided by the present invention is further described below:
edge equipment (PE-1-PE-N/PE- (N +1) -PE-2N) of the access layer operator bearer network: the method is used for monitoring alarm states of a working link and a Protection link, operating, managing and maintaining the alarm states of a working PW and a Protection PW OAM (Operation Administration and maintenance), monitoring or changing a protocol state of a PW-APS (PW Automatic Protection Switching) according to a network management command, and performing PW Protection group Switching action and updating the PW Protection group Switching state according to the alarm and the protocol state.
Edge equipment (home node PE-A/PE-B) of a core layer operator bearer network is used for (1) monitoring alarm states of a working link and a Protection link at a network side, alarm states of a working PW and a Protection PW OAM, monitoring or changing a PW-APS protocol/MC-PW-APS (Multi-sessions Pseudo wire Automatic Protection Switching protocol) protocol state, performing MC-PW Protection group Switching action according to the alarm and the protocol state and updating the MC-PW Protection group Switching state; (2) monitoring an access link side working link and Protection link alarm state, a working multiplexing Section and Protection multiplexing Section OAM alarm state, monitoring or changing an MC-LMSP-APS (Multi-sessions Linear multiplex Section Protection Automatic Protection Switching protocol) protocol/main/standby MC-LAG Protection state according to a network management command, carrying out MC-LMSP/main/standby MC-LAG Protection group Switching action according to the alarm and the protocol state and updating the MC-LMSP/MC-LAG Protection group Switching state; (3) state synchronization and data synchronization between redundant main/standby core floorpoints (main/standby home nodes) PE-A and PE-B are realized through an ICCP protocol; (4) comparing whether the main and standby attributes of the core landing PE are consistent with the main and standby attributes of the MC-LMSP/main and standby MC-LAG or not; (5) and establishing or changing a three-point bridge (the three-point bridge refers to a bridging relation among a PW (working PW or protection PW), a DNI-PW and an access link) on the two core grounding points (home nodes) according to a decision result to realize normal forwarding of the service flow.
Edge device (CE) at customer side of carrier network monitors alarm state of working link and protection link or OAM alarm state of working multiplexing section and protection multiplexing section at access link side, monitors or changes LMSP-APS protocol/main/standby MC-LAG protection state according to network management command, carries out LMSP/main/standby LAG protection group switching action according to alarm and protocol state and updates LMSP/main/standby LAG protection group switching state.
The system provided by the invention obtains a comparison result by comparing the master/slave information of the MC-PW protection group at the home node side with the master/slave information of the MC-LMSP protection group or the master/slave MC-LAG aggregation group at the access link side connected with the CE, and manages the bridging or switching of the dual-home protection according to the comparison result, thereby realizing the protection requirement of the dual-home service mixed configuration application in the PTN engineering deployment.
It will be understood by those of ordinary skill in the art that all or part of the steps of the above embodiments may be implemented using a computer program flow, which may be stored in a computer readable storage medium and executed on a corresponding hardware platform (e.g., system, apparatus, device, etc.), and when executed, includes one or a combination of the steps of the method embodiments.
Alternatively, all or part of the steps of the above embodiments may be implemented by using an integrated circuit, and the steps may be respectively manufactured as an integrated circuit module, or a plurality of the blocks or steps may be manufactured as a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The devices/functional modules/functional units in the above embodiments may be implemented by general-purpose computing devices, and they may be centralized on a single computing device or distributed on a network formed by a plurality of computing devices.
Each device/function module/function unit in the above embodiments may be implemented in the form of a software function module and may be stored in a computer-readable storage medium when being sold or used as a separate product. The computer readable storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. A method for dual homing protection of hybrid configuration of a Packet Transport Network (PTN) is characterized by comprising the following steps:
comparing the master and slave information of the network side cross-frame pseudo wire MC-PW protection group on the home node with the master and slave information of the access link side cross-frame linear multiplexing segment MC-LMSP protection group or the master and slave cross-frame link MC-LAG aggregation group to obtain a comparison result;
according to the comparison result, managing the dual-homing protection bridging or switching;
wherein, according to the comparison result, managing the dual-homing protection bridging or switching comprises:
if the comparison result is consistent, directly entering a bridging flow or a switching flow;
and if the comparison result is inconsistent, negating the decision result of the access link side MC-LMSP protection group or the main/standby MC-LAG aggregation group, and entering a bridging flow or a switching flow according to the negated result.
2. The method of claim 1, wherein negating the decision result of the access link side MC-LMSP protection group or the active/standby MC-LAG aggregation group according to the comparison result comprises:
when the access link is a Synchronous Digital Hierarchy (SDH) link, the protection group connected with the CE is an MC-LMSP protection group, and if the decision result of the MC-LMSP protection group is that the service is in a working unit, the result obtained after negating the decision result is that the service is in a protection unit; if the decision result of the MC-LMSP protection group is that the service is in the protection unit, the result obtained by negating the decision result is that the service is in the working unit;
when the access link is an Ethernet link, the protection group connected with the CE is a main and standby MC-LAG aggregation group, if the aggregation state decision result of the main and standby MC-LAG is that the main link aggregation state and the standby link aggregation state are respectively started and stopped, the result after negating the decision result is that the main link aggregation state and the standby link aggregation state are respectively stopped and started; and if the aggregation state decision result of the main and standby MC-LAGs is that the aggregation state of the main link and the aggregation state of the standby link are respectively stop and start, the result obtained after negating the decision result is that the aggregation state of the main link and the aggregation state of the standby link are respectively start and stop.
3. The method of claim 1, wherein the entering the bridging procedure comprises:
and managing the bridging relation among the network side PW, the double-node interconnection pseudowire DNI-PW and the access link.
4. An apparatus for PTN hybrid configuration dual homing protection, comprising:
the comparison module is used for comparing the consistency of the main and standby information of the MC-PW protection group on the network side of the home node with the main and standby information of the MC-LMSP protection group on the access link side or the MC-LAG aggregation group of the main and standby cross-frame links to obtain a comparison result;
the management module is used for managing the dual-homing protection bridging or switching according to the comparison result;
the management module is specifically configured to:
if the comparison result is consistent, directly entering a bridging flow or a switching flow;
and if the comparison result is inconsistent, negating the decision result of the access link side MC-LMSP protection group or the main/standby MC-LAG aggregation group, and entering a bridging flow or a switching flow according to the negated result.
5. The apparatus of claim 4, wherein the management module negating the decision result of the protection group associated with the CE comprises:
when the access link is an SDH link, the protection group connected with the CE is an MC-LMSP protection group, if the decision result of the MC-LMSP protection group is that the service is in the working unit, the result obtained after negating the decision result is that the service is in the protection unit; if the decision result of the MC-LMSP protection group is that the service is in the protection unit, the result obtained by negating the decision result is that the service is in the working unit;
when the access link is an Ethernet link, the protection group connected with the CE is a main and standby MC-LAG aggregation group, if the aggregation state decision result of the main and standby MC-LAG is that the main link aggregation state and the standby link aggregation state are respectively started and stopped, the result after negating the decision result is that the main link aggregation state and the standby link aggregation state are respectively stopped and started; and if the aggregation state decision result of the main and standby MC-LAGs is that the aggregation state of the main link and the aggregation state of the standby link are respectively stop and start, the result obtained after negating the decision result is that the aggregation state of the main link and the aggregation state of the standby link are respectively start and stop.
6. The apparatus of claim 4, wherein the management module is specifically configured to:
and managing the bridging relation among the PW, the DNI-PW and the access link at the network side.
7. A PTN hybrid configuration dual-homing protection switching system is characterized by comprising:
the edge device of the access layer operator carrying network is used for monitoring the alarm states of the working link and the protection link, carrying out switching operation on the link according to the alarm information and updating the switching state of the PW protection group;
an edge device of a core layer operator bearer network comprising the apparatus of any of claims 4 to 6;
the edge device at the client side of the bearer network is used for monitoring the alarm states of the working link and the protection link or the alarm states of the working multiplexing section and the protection multiplexing section at the access link side, performing the switching action of the LMSP or the main/standby MC-LAG aggregation group according to the alarm and the protocol state and updating the switching state of the LMSP or the main/standby MC-LAG aggregation group.
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