CN102148713A - Linear protection switching method applicable to large-capacity PTN (packet transport network) device - Google Patents
Linear protection switching method applicable to large-capacity PTN (packet transport network) device Download PDFInfo
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Abstract
The invention relates to a linear protection switching method applicable to a large-capacity PTN (packet transport network) device. At a communication source end node, output ports are configured by a crossed unit into three service forwarding instances, namely a main NNI (network node interface) port, a standby NNI port, and a main-standby NNI port; keywords matched to generate target MAC (media access control) addresses, namely MACn1, MACn2, and MACn3; at a communication destination end node, the interface units of the main and standby NNI interfaces are respectively configured with service processing instances; and the keyword to be matched is a Tunnel label; however, only the main service instance is in activated state; during switching, corresponding switching operations are implemented according to protection modes (1-plus-1 protection and 1-to-1 protection). The most fundamental thought of the linear protection switching method applicable to the large-capacity PTN (packet transport network) device is to convert centralized switching into distributed switching; the crossed unit only implements high speed packet forwarding, and does not participate in switching motions; therefore, the switching motions are carried out by a plurality of service processing units; moreover, the service processing units process the switching motions concurrently, so the switching speed is improved by times.
Description
Technical field
The present invention relates to the linear protection technology of big capacity Packet Transport Network, is a kind of linear protection switching method that is applicable to big capacity PTN equipment specifically.
Background technology
Packet Transport Network (PTN) is based on multi-service tranmission techniques grouping, connection-oriented, and PTN is about to be used on a large scale in high-quality service bearer fields such as wireless backhaul, big customer's special line, order videos.It is at the requirement of the sudden and statistic multiplexing of Packet Service flow and design.The PTN technology has connection-oriented data forwarding mechanism, multiple service supporting, stronger extension of network, abundant OAM and (operation (Operation), management (Administration), safeguards (Maintenance), abbreviation OAM), technical characterictics such as QoS (Quality of Service, the service quality) mechanism of strictness and carrier level reliability.
The mainstream technology scheme of PTN can be divided into Ethernet enhancement techniques and transmission technology in conjunction with MPLS (multiprotocol label switching) two big classes, the former is representative with PBB-TE (supplier's backbone bridging-traffic engineering friendly link), and the latter is representative with MPLS-TP (transmitting the multi protocol label exchange).The data forwarding of PTN is based on that label carries out, and promptly constitutes connection-oriented end to end label forwarding path (LSP) by label.The thinking unanimity of same SDH (SDH (Synchronous Digital Hierarchy)) path protection, MPLS-TP supports the linear protection of LSP, comprises following three kinds: 1+1 linear protection and 1:1 linear protection and M:N linear protection.
For access point apparatus and convergent point equipment, the LSP entry number of network element limited (being generally less than unidirectional 2048), the mode that can adopt cross unit to focus on is finished the switching of active-standby path, and its switching time and recovery time are more satisfactory, can satisfy the requirement of 50mS switching time fully.But for the big capacity PTN of core layer equipment; its capacity big (generally more than 320Gbps), the LSP entry number big (generally greater than 2048) that needs protection; so continue to use the mode that cross unit focuses on if appoint, then be difficult to satisfy the requirement (less than 50ms) of quick protective switch and recovery.
The linear protection operation principle:
As Fig. 1, dispose between network element A and the network element C by network element A through the label switched path (LSP) of network element B to network element C; Be the reliability (as preventing that faults such as network element B power down, link fiber interruption from causing communication disruption between network element A and the network element C) that improves this LSP, configuration is by the standby label switched path of network element A process network element D to network element C.
Under the normal operating conditions, business is forwarded to (shown in solid line among Fig. 1) on working port and the operating path at network element A, and at purpose network element C, the business from main port is received in the service port choosing.Nonserviceable down, interrupt in the path of A-B-C, and business is forwarded to standby port and backup path (shown in dotted line among Fig. 1,2) at source end network element A, at purpose network element C, the business from standby port is received in the service port choosing, thereby has avoided service disconnection, as shown in Figure 2.Above process is carried out the harmonious of sourcesink end by APS (APS) agreement.Switching action only occurs in the sourcesink two ends, and is irrelevant with intermediate NE, thus have realize simple, switch characteristics fast.
When A when the optical fiber of B direction breaks down, the A station will be bridged to business another direction of ring; The B station receives switches.The detection of this fault generally realizes by OAM, promptly periodically send to connect and confirm (Continuity Verification) frame (cycle is generally 3.3ms) to place end network element C by source end network element A, if do not receive CV (connect and the confirm) frame of expectation in continuous three cycles, think that then this link breaks down.Main control software starts wrap protection after detecting this fault, and does switching of transmitting terminal by APS agreement announcement source end.
Concerning access device and small-sized convergent type equipment, it is processing mode that general employing is concentrated, and promptly receives in the choosing of cross unit work transmission bridge joint and receiving terminal, not difficult for the 50ms switching time, because the entry number of processing is generally less than 1024.
For aggregation node and core node, need the entry number generally big (greater than 2048) of the LSP of configuration protection, the time requirement of LSP linear protection switching is less than 50ms.And need 10ms (3.3ms * 3 ≈ 10ms) detection time of fault at least, the time of the time of software processes and chip action is less than 40ms so, this to centralized switch to handle brought enormous pressure.
So must solve the quick protective switch problem of big capacity PTN equipment.
Summary of the invention
At the defective that exists in the prior art; the object of the present invention is to provide a kind of linear protection switching method that is applicable to big capacity PTN equipment; its the most basic thought is to change distributed switching into by centralized switching; cross unit is only done high-speed packet and is transmitted; do not participate in switching action; thereby switching action is shared on a plurality of Service Processing Units, and each Service Processing Unit parallel processing switching action significantly improves the speed of switching.
For reaching above purpose, the technical scheme that the present invention takes is:
A kind of linear protection switching method that is applicable to big capacity PTN equipment, it is characterized in that by centralized switch to handle change distributed treatment into, be implemented as follows described:
1) at the communication sources end node, cross unit configuration outlet is main with NNI port, standby N NI port, active and standby three professional forwarding instances with the NNI port, described professional forwarding instance is static clean culture example or static multicast example, the coupling keyword is a target MAC (Media Access Control) address, is respectively MACn1, MACn2, MACn3;
Under the 1+1 protection pattern, business is broadcast to primary and backup NNI port all the time;
Under 1:1 protected mode normal condition, business unicasts to the main NNI port of using;
Under 1:1 protected mode switch status, business unicasts to standby N NI port;
Entrained various objectives MAC Address decision when these three kinds of states are left the uni interface unit and entered cross unit by grouping, and be controlled by uni interface cell processing software;
2) at communication place end node, active and standby with NNI interface place interface unit difference configuration service processing example, the coupling keyword is the Tunnel label; But having only the working traffic example is state of activation;
When 3) switching, to 1+1 protection, only need communication place end standby N NI interface business example to activate and to recover professional, and deexcitation is main with NNI interface business example; 1:1 is protected, the uni interface unit of source end node is changed into MACn2 with the target MAC (Media Access Control) address of grouping by MACn1, cross unit is realized business is switched to backup path automatically, and place end node standby N NI interface business example activates, and deexcitation is main with NNI interface business example;
4) at alternate path restore and through behind the Wait to Restore Time, carry out the inverse process of above-mentioned action, promptly realized switching recovery.
On the basis of technique scheme, the distribution principle of described MACn1, MACn2, three MAC Address of MACn3 is:
1:1 protects end uni interface unit, source, user grouping is made tag processes after, its target MAC (Media Access Control) address is set to MACn1;
End uni interface unit, 1+1 protection source, user grouping made tag processes after, its target MAC (Media Access Control) address is set to MACn3;
1:1 protection source end UNI cross unit, configuration UNI mouth is to main forwarding instance with the NNI mouth;
1+1 protection source end UNI cross unit, configuration UNI mouth is to the forwarding instance and the activation of primary and backup NNI mouth;
Under two kinds of protected modes, place end network element master is with NNI interface configuration srvice instance and activate, standby N NI interface configuration srvice instance but do not activate.
On the basis of technique scheme, during normal condition:
1:1 protects end uni interface unit, source, user grouping is made tag processes after, its target MAC (Media Access Control) address is set to MACn1;
End uni interface unit, 1+1 protection source, user grouping made tag processes after, its target MAC (Media Access Control) address still is MACn3;
1:1 protection source end UNI cross unit, the UNI port service is forwarded to the main NNI mouth of using;
1+1 protection source end UNI cross unit, the UNI port service is forwarded to primary and backup NNI mouth simultaneously;
1:1 protection place end NNI interface unit has only main with the srvice instance activation of NNI interface to cross unit;
1+1 protection place end NNI interface unit has only main with the srvice instance activation of NNI interface to cross unit.
On the basis of technique scheme, during switch status:
1:1 protects end uni interface unit, source, user grouping is made tag processes after, its target MAC (Media Access Control) address is set to MACn2;
End uni interface unit, 1+1 protection source, user grouping made tag processes after, its target MAC (Media Access Control) address still is MACn3;
1:1 protection source end UNI cross unit, the UNI port service is forwarded to standby N NI mouth;
1+1 protection source end UNI cross unit, the UNI port service is forwarded to primary and backup NNI mouth simultaneously;
1:1 protection place end NNI interface unit has only standby N NI interface to activate to the srvice instance of cross unit;
1+1 protection place end NNI interface unit has only standby N NI interface to activate to the srvice instance of cross unit.
On the basis of technique scheme, the harmonious of sourcesink end realizes that by the APS agreement the harmonious of each unit of network element internal realized by Control on Communication bus in the network element.
The linear protection switching method that is applicable to big capacity PTN equipment of the present invention; its the most basic thought is to change distributed switching into by centralized switching; cross unit is only done high-speed packet and is transmitted; do not participate in switching action; thereby switching action is shared on a plurality of Service Processing Units; each Service Processing Unit parallel processing switching action significantly improves the speed of switching.
Description of drawings
The present invention has following accompanying drawing:
Figure 11: 1 linear protection switching normal operating conditions,
Figure 21: 1 linear protection switching operating state,
Figure 31+1 protected mode source end network element internal packet forward schematic diagram,
Figure 41: source end network element internal packet forward schematic diagram under the 1 protected mode normal condition,
Place end network element internal packet forward schematic diagram under Fig. 5 normal condition,
Figure 61: source end network element internal packet forward schematic diagram under the 1 protected mode switch status,
Place end network element internal packet forward schematic diagram under Fig. 7 switch status.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
The linear protection switching method that is applicable to big capacity PTN equipment of the present invention, by centralized switch to handle change distributed treatment into, be implemented as follows described:
1) at the communication sources end node, cross unit configuration outlet is main with NNI (Network Node Interface, Network-Node Interface) port, standby N NI port, active and standby three professional forwarding instances with the NNI port, described professional forwarding instance is static clean culture example or static multicast example, the coupling keyword is a target MAC (Media Access Control) address, is respectively MACn1, MACn2, MACn3; Under the 1+1 protection pattern, business is broadcast to primary and backup NNI port all the time; Under 1:1 protected mode normal condition, business unicasts to the main NNI port of using; Under 1:1 protected mode switch status, business unicasts to standby N NI port; These three kinds of states leave UNI (Uer to Network Interface, User Network Interface) entrained various objectives MAC Address decision when interface unit enters cross unit by grouping, and are controlled by uni interface cell processing software;
2) at communication place end node, active and standby with NNI interface place interface unit difference configuration service processing example, the coupling keyword is the Tunnel label; But having only the working traffic example is state of activation;
When 3) switching, to 1+1 protection, only need communication place end standby N NI interface business example to activate and to recover professional, and deexcitation is main with NNI interface business example; 1:1 is protected, the uni interface unit of source end node is changed into MACn2 with the target MAC (Media Access Control) address of grouping by MACn1, cross unit is realized business is switched to backup path automatically, and place end node standby N NI interface business example activates, and deexcitation is main with NNI interface business example;
4) at alternate path restore and through behind the Wait to Restore Time, carry out the inverse process of above-mentioned action, promptly realized switching recovery.
As seen from the above technical solution and since cross unit protection switch with recovery process in all do not participate in action and carry out, therefore avoided tediously long layoutprocedure; Bridge joint and the receiving end of making a start choosing is received and is all carried out on the business dish, thereby each professional dish can parallel processing, and the disposal ability of whole network element has obtained the increase of linear multiple, has guaranteed the switching time of big capacity LSP number (greater than 8192) linear protection switching.
Fig. 3 has described 1+1 protection pattern source end network element internal forward-path; Fig. 4 has described end network element internal forward-path in source under the 1:1 protected mode normal condition; Fig. 5 has described place end network element internal packet forward schematic diagram under the normal condition; Fig. 6 has described end network element internal packet forwarding path in source under the 1:1 protected mode switch status; Fig. 7 has described place end network element internal packet forwarding path under the switch status.
Configuration with regard to each several part under the different conditions elaborates below:
1.1 professional foundation:
1:1 protects end uni interface unit, source, user grouping is made tag processes after, its target MAC (Media Access Control) address is set to MACn1;
End uni interface unit, 1+1 protection source, user grouping made tag processes after, its target MAC (Media Access Control) address is set to MACn3;
1:1 protection source end UNI cross unit, configuration UNI mouth is to main forwarding instance with the NNI mouth;
1+1 protection source end UNI cross unit, configuration UNI mouth is to the forwarding instance and the activation of primary and backup NNI mouth;
Under two kinds of protected modes, place end network element master is with NNI interface configuration srvice instance and activate, standby N NI interface configuration srvice instance but do not activate;
1.2 normal condition:
1:1 protects end uni interface unit, source, user grouping is made tag processes after, its target MAC (Media Access Control) address is set to MACn1;
End uni interface unit, 1+1 protection source, user grouping made tag processes after, its target MAC (Media Access Control) address still is MACn3;
1:1 protection source end UNI cross unit, the UNI port service is forwarded to the main NNI mouth of using;
1+1 protection source end UNI cross unit, the UNI port service is forwarded to primary and backup NNI mouth simultaneously;
1:1 protection place end NNI interface unit has only main with the srvice instance activation of NNI interface to cross unit;
1+1 protection place end NNI interface unit has only main with the srvice instance activation of NNI interface to cross unit;
1.3 switch status:
1:1 protects end uni interface unit, source, user grouping is made tag processes after, its target MAC (Media Access Control) address is set to MACn2;
End uni interface unit, 1+1 protection source, user grouping made tag processes after, its target MAC (Media Access Control) address still is MACn3;
1:1 protection source end UNI cross unit, the UNI port service is forwarded to standby N NI mouth;
1+1 protection source end UNI cross unit, the UNI port service is forwarded to primary and backup NNI mouth simultaneously;
1:1 protection place end NNI interface unit has only standby N NI interface to activate to the srvice instance of cross unit;
1+1 protection place end NNI interface unit has only standby N NI interface to activate to the srvice instance of cross unit;
The harmonious of above process sourcesink end realizes that by the APS agreement the harmonious of each unit of network element internal realizes that by Control on Communication bus in the network element this two parts content is not in this patent discussion scope.
The content that is not described in detail in this specification belongs to this area professional and technical personnel's known prior art.
Claims (5)
1. linear protection switching method that is applicable to big capacity PTN equipment, it is characterized in that by centralized switch to handle change distributed treatment into, be implemented as follows described:
1) at the communication sources end node, cross unit configuration outlet is main with NNI port, standby N NI port, active and standby three professional forwarding instances with the NNI port, described professional forwarding instance is static clean culture example or static multicast example, the coupling keyword is a target MAC (Media Access Control) address, is respectively MACn1, MACn2, MACn3;
Under the 1+1 protection pattern, business is broadcast to primary and backup NNI port all the time;
Under 1:1 protected mode normal condition, business unicasts to the main NNI port of using;
Under 1:1 protected mode switch status, business unicasts to standby N NI port;
Entrained various objectives MAC Address decision when these three kinds of states are left the uni interface unit and entered cross unit by grouping, and be controlled by uni interface cell processing software;
2) at communication place end node, active and standby with NNI interface place interface unit difference configuration service processing example, the coupling keyword is the Tunnel label; But having only the working traffic example is state of activation;
When 3) switching, to 1+1 protection, only need communication place end standby N NI interface business example to activate and to recover professional, and deexcitation is main with NNI interface business example; 1:1 is protected, the uni interface unit of source end node is changed into MACn2 with the target MAC (Media Access Control) address of grouping by MACn1, cross unit is realized business is switched to backup path automatically, and place end node standby N NI interface business example activates, and deexcitation is main with NNI interface business example;
4) at alternate path restore and through behind the Wait to Restore Time, carry out the inverse process of above-mentioned action, promptly realized switching recovery.
2. the linear protection switching method that is applicable to big capacity PTN equipment as claimed in claim 1 is characterized in that, the distribution principle of described MACn1, MACn2, three MAC Address of MACn3 is:
1:1 protects end uni interface unit, source, user grouping is made tag processes after, its target MAC (Media Access Control) address is set to MACn1;
End uni interface unit, 1+1 protection source, user grouping made tag processes after, its target MAC (Media Access Control) address is set to MACn3;
1:1 protection source end UNI cross unit, configuration UNI mouth is to main forwarding instance with the NNI mouth;
1+1 protection source end UNI cross unit, configuration UNI mouth is to the forwarding instance and the activation of primary and backup NNI mouth;
Under two kinds of protected modes, place end network element master is with NNI interface configuration srvice instance and activate, standby N NI interface configuration srvice instance but do not activate.
3. the linear protection switching method that is applicable to big capacity PTN equipment as claimed in claim 2 is characterized in that, during normal condition:
1:1 protects end uni interface unit, source, user grouping is made tag processes after, its target MAC (Media Access Control) address is set to MACn1;
End uni interface unit, 1+1 protection source, user grouping made tag processes after, its target MAC (Media Access Control) address still is MACn3;
1:1 protection source end UNI cross unit, the UNI port service is forwarded to the main NNI mouth of using;
1+1 protection source end UNI cross unit, the UNI port service is forwarded to primary and backup NNI mouth simultaneously;
1:1 protection place end NNI interface unit has only main with the srvice instance activation of NNI interface to cross unit;
1+1 protection place end NNI interface unit has only main with the srvice instance activation of NNI interface to cross unit.
4. the linear protection switching method that is applicable to big capacity PTN equipment as claimed in claim 2 is characterized in that, during switch status:
1:1 protects end uni interface unit, source, user grouping is made tag processes after, its target MAC (Media Access Control) address is set to MACn2;
End uni interface unit, 1+1 protection source, user grouping made tag processes after, its target MAC (Media Access Control) address still is MACn3;
1:1 protection source end UNI cross unit, the UNI port service is forwarded to standby N NI mouth;
1+1 protection source end UNI cross unit, the UNI port service is forwarded to primary and backup NNI mouth simultaneously;
1:1 protection place end NNI interface unit has only standby N NI interface to activate to the srvice instance of cross unit;
1+1 protection place end NNI interface unit has only standby N NI interface to activate to the srvice instance of cross unit.
5. as claim 1 or 2 or the 3 or 4 described linear protection switching methods that are applicable to big capacity PTN equipment; it is characterized in that: the harmonious of sourcesink end realizes that by the APS agreement the harmonious of each unit of network element internal realized by Control on Communication bus in the network element.
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| CN112218181A (en) * | 2019-07-12 | 2021-01-12 | 烽火通信科技股份有限公司 | Protection switching method and system |
| CN112218181B (en) * | 2019-07-12 | 2022-08-30 | 烽火通信科技股份有限公司 | Protection switching method and system |
| CN112087326A (en) * | 2020-08-24 | 2020-12-15 | 烽火通信科技股份有限公司 | Multi-instance dynamic deployment transceiving method and system |
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