CN1741428A - Method for realizing four fibre loop multiplying segment protection management - Google Patents
Method for realizing four fibre loop multiplying segment protection management Download PDFInfo
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Abstract
A method for realizing protective management of four fibre ring multiplexing section includes forming four fibre ring by a pair of man fibre for transmitting main service and a pair of spare fibre for transmitting extra service ; setting protection set with identification protective relation on corresponding end node of both fibres ; forming protection set with protected unit , section protection unit and ring protection unit , using all above protection unit to protect relation management which carries out section rotation first to use spare fibre for transmitting main service when main fibre is fault then carries out ring rotation when spare fibre is also fault .
Description
Technical Field
The invention relates to the field of synchronous optical networks, in particular to a method for realizing four-fiber multiplexing section ring protection management in a synchronous optical network through a Q3 interface.
Background
In order to meet the requirements of Telecommunication industry development on network Management development for improving network service quality, reasonably using network resources and reducing maintenance cost, the international Telecommunication Union ITU-T (International Telecommunication Union-Telecommunication Standardization division selection) provides a Telecommunication Management Network (TMN) (Telecommunication Management network) concept. The purpose of the telecommunications management network TMN is to provide an organized architecture and standardized interface from the perspective of the global telecommunications network, so that management information can be exchanged between different types of management systems, between management systems and telecommunications equipment in a consistent manner, and the entire telecommunications network can be maintained and managed in a unified manner according to a standardized method.
The telecommunications management network TMN divides the management functions into different logical levels, as shown in fig. 1, from bottom to top, five levels, namely, a Network Element Level (NEL), an Element Management Level (EML), a Network Management Level (NML), a Service Management Level (SML), and a Business Management Level (BML). The idea of TMN is fully embodied in the SDH technology system, and a transmission network is an ideal model that can first realize TMN.
The telecommunications management network TMN is a set of relative concepts that achieve various management goals by means of managers/agents. The manager and the agent are part of the TMN management application, and the manager issues management commands and receives responses from the agent and notifications sent back to implement various management functions. The agent responds to the command sent by the manager, implements specific operation on the related management object, and sends back a notice reflecting the object behavior to the manager.
The Q3 interface is the interface between an administrator (Manager) and an Agent (Agent) in the telecommunications management network TMN, and includes not only the communication protocols of OSI from one layer to seven layers, but also the management messages and management information Model (MIB) in the seventh layer.
The flow pointer at the telecommunications management network TMN indicates the flow direction of the traffic, which changes as the traffic changes. Once Q3 is established with the related MO (single board, cross), the flow pointer is dynamically generated accordingly. The flow pointers are divided into upstream pointers (US) and downstream pointers (DS). It is described in ITU-T as: DownstreamConnectionyPointer ATTRIBUTE
WITH ATTRIBUTE SYNTAXASN1DefinedTypesModule.DownstreamConnectivityPointer；
MATCHES FOR EQUALITY，SET-COMPARISON，SET-INTERSECTION；
BEHAVIOUR
downstreamConnectivityPointerBehaviour BEHAVIOUR
DEFINED AS
“The matching for equality is applicable for all choices of the syntax.
The set operations are permitted only when the choice of the syntaxcorrespond to either broadcast or concatenated broadcast.”；；REGISTERED AS{m3100Attribute 19}；upstreamConnectivityPointer ATTRIBUTE
WITH ATTRIBUTE SYNTAXASN1DefinedTypesModule.ConnectivityPointer；
MATCHES FOR EQUALITY；
BEHAVIOUR
upstreamConnectivityPointerBehaviour BEHAVIOUR
DEFINED AS
“The matching for equality is applicable for all the choices of thesyntax.”；；REGISTERED AS{m3100Attribute 49}；
In the TMN hierarchy of a telecommunications management network, as shown in fig. 1, an Element Management System (EMS) may provide information of the EMS layer to a NMS through a Q3 interface. The protection management of the multiplexing section is an important component of network management, and the networking forms of a linear multiplexing section, a two-fiber multiplexing section ring, a four-fiber multiplexing section ring and the like all need the protection management of the multiplexing section.
The following takes a two-fiber ring (STM 16-level two-fiber ring) as an example to illustrate the switching manner of the prior art: two unidirectional optical fibers are arranged between each pair of adjacent network elements and combined together to form a bidirectional service. The first eight time slots of each pair of optical fibers bear the main service, and the last eight time slots bear the extra service; in the protection relationship, for a particular network element, the first eight timeslots in the west are protected by the last eight timeslots in the east, and the first eight timeslots in the east are protected by the last eight timeslots in the west. When a certain section of optical fiber fails, the adjacent network elements of the section of optical fiber execute switching operation, the service loaded on the first eight time slots of the failed optical fiber is transferred to the last eight time slots of the protected optical fiber, and the extra service loaded on the last eight time slots is interrupted.
However, in the international telecommunication union G774_3 recommendation, only the Q3 interface information model scheme of the linear multiplexing section and the two-fiber multiplexing section ring is given, and the Q3 interface information model scheme is not provided for the four-fiber multiplexing section ring protection management, so that a method for implementing the four-fiber multiplexing section ring protection management through the Q3 interface is not available in the prior art.
The modeling process for the protection of the multiplex section in G774_3 of the prior art is as follows:
sdhMSProtectionUnit MANAGED OBJECT CLASS
DERIVED FROM protectionUnit；
CHARACTERIZED BY
sdhMSProtectionUnitPkg PACKAGE
BEHAVIOUR sdhMSProtectionUnitBeh；
ATTRIBUTES
channelNumber GET，
protectionStatus GET，
reliableResourcePointer PERMITTED VALUES
SDHProtASN1.SDHMSResourcePointer，
unreliableResourcePointer PERMITTED VALUES
SDHProtASN1.SDHMSResourcePointer；；；
CONDITIONAL PACKAGES
sdhPriorityPkg PRESENT IF″this is a 1：n system″，
lastAttemptResultPkg PRESENT IF″the APS protocol is used″，
extraTrafficControlPkg PRESENT IF″extra traffic may be
suspended and resumed″；
REGISTERED AS{g774-03MObjectClass 8}；
in the scheme, a protected resource can be described through a reusable resource provider, a resource before protection formation can be described through a nonreservable resource provider, the protection and switching states of a two-fiber multiplexing section ring and a linear multiplexing section can be well described, the description before switching of the two-fiber multiplexing section ring is shown in fig. 2, wherein west 5 and east 6 are a pair of adjacent network elements, the first eight time slots of each pair of optical fibers bear main service, and the last eight time slots bear additional service; in the protection relationship, for a certain specific network element, the first eight timeslots in the west direction are protected by the second eight timeslots in the east direction, i.e. the first switching identifier 111 in fig. 2; the first eight timeslots in the east direction are protected by the second eight timeslots in the west direction, that is, the second switching identifier 112 in fig. 2, PDPU in the first and second switching identifiers is used to identify protected protection units, and PGPU is used to identify protected protection units.
The description of the two-fiber multiplexing section ring switching is shown in fig. 3, in which: the description of the sdhMSProtectionUnit is the same as that before switching, except that the direction of the stream pointer of the corresponding unprotected connection termination point UCTP is changed: when the east 6 optical fiber fails, the adjacent network element west 5 of the optical fiber section will execute the switching operation, and the service (main service of east 6) carried in the first eight time slots of the failed optical fiber is transferred to the last eight time slots of the protected optical fiber, and the extra service carried in the last eight time slots is interrupted.
The attribute of the protection unit of the model in the prior art can only support to distinguish whether the corresponding resource is a protected/protected resource, and for a four-fiber multi-use segment ring, because each protected resource of the four-fiber multi-use segment ring has two protection resources, namely a segment protection resource and a ring protection resource, the model in the prior art cannot distinguish whether the resource is a segment protection resource or a ring protection resource; therefore, the protection relationship of the four-fiber multi-use section ring cannot be completely expressed, and no management implementation method for the protection relationship of the four-fiber multi-use section ring exists in the prior art.
Therefore, the prior art has defects and needs to be improved and developed.
Disclosure of Invention
The invention aims to provide a method for realizing four-fiber-ring multiplexing section protection management, which is a method for realizing the four-fiber-ring multiplexing section protection management through a Q3 interface in a synchronous optical network, overcomes the defect that section protection resources or ring protection resources cannot be distinguished in the prior art, and adds attribute description bytes, thereby being effectively applied to the protection management of a four-fiber-ring multiplexing section, and ensuring that the four-fiber-ring multiplexing section protection management between NMS (network management system) and EMS (energy management system) is more standard and effective.
The specific technical scheme of the invention is as follows:
a method for realizing protection management of a multi-use section of a four-fiber ring comprises a pair of primary fibers for transmitting primary services and a pair of standby fibers for transmitting additional services, wherein termination points corresponding to the primary fibers and the standby fibers are provided with protection groups for identifying protection relations; wherein,
the protection group comprises a protected unit for identifying protected services, a section protection unit for identifying the protected services in the section switching relationship and a ring protection unit for identifying the protected services in the ring switching relationship;
each protection unit is used for protection relationship management, and under the condition that the main optical fiber is in failure or under manual control, section switching is preferentially carried out, and the same-direction standby optical fiber of the network element is used for transmitting the main service; and performing ring switching under the condition that the same-direction standby optical fiber has faults and is manually controlled, and transmitting the main service by using the reverse-direction standby optical fiber.
The method comprises the steps that the section switching processing mode of the Q3 interface is that firstly, a section protection unit in a corresponding protection group is checked according to interface input information, and an unprotected connection termination point corresponding to a protection optical fiber is found according to an unreliable resource pointer of the section protection unit; then, the service flow of the protected path termination corresponding to the protected unit of the protection group is diverted to the found unprotected connection termination, and the protected unit is updated to the section switching state.
The method, wherein the ring switching is performed on the Q3 interface in a manner that, first, a ring protection unit in a corresponding protection group is checked according to interface input information, and an unprotected connection termination point corresponding to a protection optical fiber is found according to an unreliable resource pointer of the ring protection unit; then, the service flow of the protected path termination point corresponding to the protected unit of the protection group is diverted to the found unprotected connection termination point, and the protected unit is updated to the ring switching state.
The method for realizing the four-fiber-ring-reuse-section protection management provided by the invention adopts the Q3 interface four-fiber-reuse-section ring protection management information model, and adds the attribute parameters in the modeling attribute setting, thereby realizing the function of performing the four-fiber-reuse-section ring protection management through the Q3 interface and improving the four-fiber-reuse-section ring protection management efficiency of the SDH network.
Drawings
FIG. 1 is a schematic diagram of a prior art TMN hierarchy;
fig. 2 is a schematic diagram of an example tree of a two-fiber reuse section ring protection management Q3 interface before switching in the prior art;
FIG. 3 is a schematic diagram of a rearranged example tree of the prior art two-fiber multiplex section ring shown in FIG. 2;
FIG. 4 is a schematic diagram of an example tree structure before switching four fiber loops according to the method of the present invention;
FIG. 5 is a schematic diagram of an example tree state after performing section switching on a four-fiber ring according to the method of the present invention;
fig. 6 is a schematic diagram of an example tree state after the method of the present invention performs ring switching on a four-fiber ring.
Detailed Description
The process of the invention will be described in further detail below with reference to the accompanying drawings and examples:
the invention relates to a method for realizing four-fiber ring multiplex section protection management, which is characterized in that an attribute parameter switch mode is added on the basis of an sdhMSProtectionUnit suggested by G774_3, and the attribute parameters can take different attributes such as bidSwitch (0), ringSwitch (1), span Switch (2), nonswitch (3) and the like, so that the protection units (protection units other than four-fiber rings, protection units for section protection, protection units for ring protection and protected units for four-fiber rings) can be distinguished.
In a model structure of a four-fiber ring (taking an STM 16-level four-fiber ring as an example), four optical fibers exist between each pair of adjacent network elements, one pair of optical fibers forms a main optical fiber for transmitting main services, and the other pair of optical fibers forms a protection optical fiber for carrying extra services; in the protection relation, the west primary optical fibers are simultaneously protected by the west spare optical fibers and the east spare optical fibers, and the east primary optical fibers are simultaneously protected by the east spare optical fibers and the west spare optical fibers. When one main optical fiber fails, the service is firstly switched to a standby optical fiber in the same direction; the switching that occurs at this time is called section switching (span switch); if the spare fiber in the same direction has a fault, the service is switched to the spare fiber in the other direction, and the switching is called ring switching (ring switch).
Because each protected resource of the four-fiber multi-use segment ring has two protection resources, namely a segment protection resource and a ring protection resource, in the model use of the method, each protection group needs to protect three protection units, namely a protected unit, a segment protection unit and a ring protection unit.
Because the sdhMSProtectionUnit in the G774-3 proposal cannot further distinguish a section protection unit and a ring protection unit, the method of the invention adds a switchMode attribute on the basis of the sdhMSProtectionUnit, revises the sdhMSProtectionUnit HW as sdhMSProtectionUnit HW, and is used for distinguishing the section protection unit and the ring protection unit; the detailed definition is as follows:
sdhMSProtectionUnitHW MANAGED OBJECT CLASS
DERIVED FROM
″ITU G.774.03″：sdhMSProtectionUnit；
CHARACTERIZED BY
sdhMSProtectionUnitHWPkg PACKAGE
ATTRIBUTES
switchMode GET-REPLACE；；；
REGISTERED AS{huaweiSDHObjectClass 14}；
switchMode ATTRIBUTE
WITH ATTRIBUTE SYNTAX SDHhuawei.SwitchMode；
MATCHES FOR EQUALITY；
BEHAVIOUR
switchModeBehBEHAVIOUR
DEFINED AS″...″；；
REGISTERED AS{huaweiSDHAttribute 14}；
SwitchMode::＝ENUMERATED{
bidSwitch(0)，
ringSwitch(1)，
spanSwitch(2)，
noSwitch(3)
}
it should be noted that the names of the attribute parameters in the above description of the specific embodiments are too specific to be understood as limiting the claimed scope of the method of the present invention, and the names of the parameters may be changed.
The added switchMode attribute in the model of the method has the following meanings of the values of the attribute:
● bidSwitch: indicating a non-quad ring, in the case of the non-quad ring, switchmode of all protection units is uniformly set to this value, and the function of the protection unit is consistent with that defined by G774_ 3;
● ringSwitch: two functions are used, one is that a ring protection resource for ring switching of a four-fiber ring is identified, the switch mode of a protection unit PU for ring switching is always set to ring switch, and the other is that the current switching state of a protection group is identified, if the protection group is in the ring switching condition, the switch mode of the protection unit PU for protection is set to ring switch;
● span switch: two functions are used, one is that a section protection resource for identifying ring switching of a four-fiber ring, the switch mode of a protection unit PU for section switching is always set to span switch, and the other is that the current switching state of a protection group is identified, if the protection group is in the condition of section switching, the switch mode of the protection unit PU to be protected is set to span switch;
● nonswitch: this value may only be set in the protected protection unit PU, which indicates that no switching occurs in the four fiber ring, and when no switching occurs in the four fiber ring, the SwitchMode of the protected protection unit PU is set to nonswitch.
Under normal non-switching condition, the PDPU value is nonswitch, and the pgpu (ring) value is ringSwitch; the pgpu (span) value is span switch, and the protection relationship is as shown in the schematic diagram of the four-fiber loop model under the condition of no switching in fig. 4: each protection group includes three protection units PDPU, PGPU (ring) and PGPU (span), which are respectively described as a protected unit PDPU, a segment protection unit PGPU (span) and a ring protection unit PGPU (ring); four optical fibers are arranged between each pair of adjacent network elements, two optical fibers form a main optical fiber for transmitting main service, and the other pair of optical fibers form a protection optical fiber for bearing extra service; in the protection system, a west pair of primary optical fibers is simultaneously protected by a west spare optical fiber and an east spare optical fiber by using the pointing direction of a protection group pointer between adjacent network elements, and an east pair of primary optical fibers is simultaneously protected by an east spare optical fiber and a west spare optical fiber. When one primary optical fiber fails, firstly, section switching (span switch) is carried out, and primary services on the primary optical fiber are firstly switched to a standby optical fiber in the same direction; if the spare optical fiber in the same direction has a fault, ring switch is performed to switch the primary service to the spare optical fiber in the other direction, and the switching can be performed according to the pointer direction of the protection group. The DS pointer describes the current traffic flow, and it can be seen that the primary fiber carries the primary traffic and the backup fiber carries the extra traffic under normal conditions. The nonswitch state of the PDPU shows that the system is in a normal non-switching state. The unreliable resource pointer ur (unreliableresourcepointer) points to the unprotected unreliable service corresponding to a protection unit; a reliable Resource pointer RR (reliable Resource pointer) points to a protected reliable service corresponding to a protection unit; UR, RR pointers merely describe protection relationships, their execution is fixed and invariant; only the downstream connection pointer ds (downlink connectivity pointer) changes after the switch. In the figure, UCTP identifies an unprotected connection Termination point ctp (connection Termination point) corresponding to a group of protected or primary optical fibers; the PTTP identifies a path termination point (ttp) (tail termination point) to be protected, and is an abstract management object corresponding to a service protected by a protected group; PDPU marks protected protection units; the PGPU identifies the protected protection unit.
In the method of the invention, under the condition of section switching, the PDPU value is span switch, and the PGPU (ring) is ring switch; pgpu (span) is a span switch, and the protection relationship is a schematic diagram of a four-fiber section model after section switching is performed as shown in fig. 5, where the switching reason may be due to a device of a primary optical fiber or an optical fiber failure, or may be an artificial command operation. Here, it can be seen through the DS pointer that the signal source of the traffic (PTTP) has been changed to a protection fiber in the same direction. The sector switching does not affect the extra traffic of other sectors.
The processing mode of the method for the northbound Q3 interface is that when section switching is found to occur, firstly, PGPU (span) in a corresponding protection group is checked according to interface input information, and UCTP corresponding to a protection optical fiber is found according to a UR pointer of a protection unit; and then, the PTTP service flow corresponding to the PDPU of the protection group is diverted to the found UCTP. The PDPU is updated to the spanSwitch state at the same time.
When the east section is switched, all the business in the west is not affected, and only the business flow pointer is switched between the east protection resource and the protected resource; and interrupting the stream pointer of the protection service, and switching the protected service to the protection resource channel.
In the method of the invention, under the condition of ring switching, the PDPU value is ringSwitch, and the PGPU (ring) value is ringSwitch; the pgpu (span) value is span switch, and the protection relationship thereof is as shown in the schematic diagram of the four-fiber ring example tree state after ring switching is performed in fig. 6: the reason for this switching may be due to equipment or fiber failure, or may be an artificial command operation. It can be seen by the DS pointer that the signal source of the traffic (PTTP) has changed to the protection fiber in the other direction. Since the ring switching occurs, it is indicated that the extra service fibers in the same direction are actually not through, i.e., the protection cannot be performed by using the section switching.
In the method, the northbound Q3 interface is processed in such a way that when a ring switch is found, PGPU (ring) in a corresponding protection group is checked according to interface input information, and UCTP corresponding to a protection optical fiber is found according to the UR pointer of the protection unit; and then, the PTTP service flow corresponding to the PDPU of the protection group is diverted to the found UCTP. The PDPU is updated to the ringSwitch state at the same time.
Under the condition of east-oriented and west-oriented ring switching, the extra business in the west direction is interrupted, and the optical fiber resource originally bearing the extra business in the west direction is used for bearing the switched east-oriented main business signal. And UR and RR on the information model are used as information description for describing the protection relationship and are changed, but a flow pointer as a resource for describing the current signal flow direction is changed along with the change of the service, when the ring is switched, the flow pointer between UCTP originally carrying extra service in the west direction and PTTP is interrupted, and the flow pointer relationship is established between the PTTP protected in the east direction and the UCTP protected in the west direction so as to describe the current signal flow direction.
The method of the invention makes up the deficiency of the G774_3 model on the expression capability of the four-fiber multiplexing section ring, and the Q3 interface established on the model can perfectly describe the state of the four-fiber multiplexing section ring, so that NMS can conveniently realize the protection management of the four-fiber multiplexing section ring.
It should be noted that the method of the present invention realizes the expression of the four-fiber reuse segment ring by perfecting the sdhMSProtectionUnit, which is only a specific embodiment adopted by the present invention; according to actual needs, the method can also realize the same function by increasing the relationship pointer between the protection units.
It should be understood that the above-mentioned embodiments of the present invention are merely illustrative of the realizability of the technical solutions of the present invention, but should not be taken as limiting the scope of the present invention, which is defined by the appended claims.
Claims (3)
1. A method for realizing protection management of a multi-use section of a four-fiber ring comprises a pair of primary fibers for transmitting primary services and a pair of standby fibers for transmitting additional services, wherein termination points corresponding to the primary fibers and the standby fibers are provided with protection groups for identifying protection relations; it is characterized in that the preparation method is characterized in that,
the protection group comprises a protected unit for identifying protected services, a section protection unit for identifying the protected services in the section switching relationship and a ring protection unit for identifying the protected services in the ring switching relationship;
each protection unit is used for protection relationship management, section switching is carried out when the main optical fiber is in failure or under manual control, and the same-direction standby optical fiber of the network element is used for transmitting the main service; and carrying out ring switching under the condition that the same-direction standby optical fiber has faults or is manually controlled, and transmitting the main service by using the opposite-direction standby optical fiber.
2. The method of claim 1, wherein the section switching is performed on the Q3 interface in a manner that first, a section protection unit in a corresponding protection group is checked according to interface input information, and an unprotected connection termination point corresponding to a protection optical fiber is found according to an unreliable resource pointer of the section protection unit; then, the service flow of the protected path termination corresponding to the protected unit of the protection group is diverted to the found unprotected connection termination, and the protected unit is updated to the section switching state.
3. The method of claim 1, wherein the ring switching is performed on the Q3 interface in a manner that first, a ring protection unit in a corresponding protection group is checked according to interface input information, and an unprotected connection termination point corresponding to a protection optical fiber is found according to an unreliable resource pointer of the ring protection unit; then, the service flow of the protected path termination point corresponding to the protected unit of the protection group is diverted to the found unprotected connection termination point, and the protected unit is updated to the ring switching state.
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|---|---|---|---|
| CN 200410075033 CN100583702C (en) | 2004-08-24 | 2004-08-24 | Method for realizing four fibre loop multiplying segment protection management |
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| CN 200410075033 CN100583702C (en) | 2004-08-24 | 2004-08-24 | Method for realizing four fibre loop multiplying segment protection management |
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| WO2009074049A1 (en) * | 2007-11-28 | 2009-06-18 | Huawei Technologies Co., Ltd. | A method and apparatus for realizing ring network protection |
| CN101170439B (en) * | 2007-09-30 | 2010-06-02 | 中兴通讯股份有限公司 | Configuration method for multiplexing loop testing butt joint of devices |
| CN101800599A (en) * | 2010-02-10 | 2010-08-11 | 瑞斯康达科技发展股份有限公司 | Optical fiber circuit-protecting equipment and system |
| CN101854255A (en) * | 2010-05-14 | 2010-10-06 | 中兴通讯股份有限公司 | Method and system for protecting multiplex section in packet transport network |
| CN101188540B (en) * | 2006-11-15 | 2010-12-01 | 中兴通讯股份有限公司 | A configuration method for protection group of chain multiplexing section |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101188540B (en) * | 2006-11-15 | 2010-12-01 | 中兴通讯股份有限公司 | A configuration method for protection group of chain multiplexing section |
| CN101170439B (en) * | 2007-09-30 | 2010-06-02 | 中兴通讯股份有限公司 | Configuration method for multiplexing loop testing butt joint of devices |
| WO2009074049A1 (en) * | 2007-11-28 | 2009-06-18 | Huawei Technologies Co., Ltd. | A method and apparatus for realizing ring network protection |
| CN101699775B (en) * | 2009-10-30 | 2012-08-29 | 华为技术有限公司 | Method for switching wave channel, device thereof and digital microwave system |
| WO2010148805A1 (en) * | 2009-12-10 | 2010-12-29 | 中兴通讯股份有限公司 | Method and apparatus for implementing dual node interconnect protection in packet transmission network |
| CN101800599A (en) * | 2010-02-10 | 2010-08-11 | 瑞斯康达科技发展股份有限公司 | Optical fiber circuit-protecting equipment and system |
| CN101800599B (en) * | 2010-02-10 | 2014-05-07 | 瑞斯康达科技发展股份有限公司 | Optical fiber circuit-protecting equipment and system |
| CN101854255A (en) * | 2010-05-14 | 2010-10-06 | 中兴通讯股份有限公司 | Method and system for protecting multiplex section in packet transport network |
| WO2011140785A1 (en) * | 2010-05-14 | 2011-11-17 | 中兴通讯股份有限公司 | Multiplex section protection method and system in packet transport network |
| CN101854255B (en) * | 2010-05-14 | 2014-03-12 | 中兴通讯股份有限公司 | Method and system for protecting multiplex section in packet transport network |
| CN103188096A (en) * | 2011-12-29 | 2013-07-03 | 中兴通讯股份有限公司 | Method and device for protecting path in TRILL network |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100583702C (en) | 2010-01-20 |
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