WO2006063512A1 - Procede de realisation de l'operation de commutation d'un reseau en anneau a origines et destinations multiples - Google Patents
Procede de realisation de l'operation de commutation d'un reseau en anneau a origines et destinations multiples Download PDFInfo
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- WO2006063512A1 WO2006063512A1 PCT/CN2005/002166 CN2005002166W WO2006063512A1 WO 2006063512 A1 WO2006063512 A1 WO 2006063512A1 CN 2005002166 W CN2005002166 W CN 2005002166W WO 2006063512 A1 WO2006063512 A1 WO 2006063512A1
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- protection
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- switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
Definitions
- the present invention relates to the field of optical network communication technologies, and in particular, to a method for implementing a many-to-many, that is, M: ring network protection switching operation.
- Survivability technology is a technology that improves the reliability performance of a network by providing the ability to recover services from service interruptions. This technology should be applied to all places where services are provided. Of course, for communication networks, providing protection switching is a must.
- SDH/S0NET Synchronous Digital Sequence/Synchronous Optical Network
- 1+1, 1:N -to-multiple
- SNCP subnet connection protection
- DNI Double Node Interconnect
- the protection switching in each of the above communication networks does not involve the M: N protection mode.
- the M: N protection mode refers to the protection mode of the M protection channels to protect the N working channels.
- the ability of the protection channel and the working channel to resist failure is generally the same, so the integration rate of the protection channel and the working channel failure should also be the same, so 1: N protection is used, when N is relatively large
- the probability of competing for a protection channel is still very large. At this time, the protection of some working channels will not be provided in the network. Therefore, it is necessary to implement M: N protection in the communication network.
- US 2004/0022279 AI describes the method of M: N path protection.
- the serial connection monitoring function, the serial reverse failure indication and the serial path identification are used. Specifically: when a failure is detected on the working section, the failure information is notified to the remote section by forcibly inserting the RDI (distal defect indication) into the serial path. Point, until the end of the failure, in the case of more than one protection path, the failure path is received and distinguished on the protection path by a unique path identifier.
- one network node is defined as a slave node, which cooperates with the master node to ensure that the same protection path is used as the master node. Two timers are used during failover to complete the recovery process of protection switching.
- the nodes of the ring network for M: N mainly include an optical cross matrix, which is used for bridging (silently) and switching (selecting functions) of optical signals.
- a network of independent optical switches is included in the optical switching matrix, each corresponding to a protection channel, connected to the protection optical port through an optical transceiver. Changing the optical switching network can change the respective protection channels within the node.
- a multiplexing and demultiplexing processing unit for converting between signals received by the optical port and optical cross-matrix processing signals. There is a failure detector that detects a signal failure after the signal is demultiplexed.
- At least two network nodes are included in the network, and two optical fibers are connected between the network nodes to respectively transmit work services and protection services.
- the patent application provides a method of arranging a protection service route such that at least two protection channels can protect a range of operating wavelengths.
- This device does not detect the status of the protection channel. Therefore, the failure of the protection channel cannot be monitored, which will result in the failure of the protection switching.
- an M: N ring network protection switching technology that uses a protection channel or a special control channel to transmit a switching protocol to perform signaling interaction and implement ring network protection switching.
- external switching commands such as FS, MS, and LP can be supported, and the protection channel priority setting can be supported to support protection when the protection and working channel bandwidth are inconsistent.
- the protection channel can transmit functions such as additional services, and can provide protection when multiple working channels fail. It can be optimized to realize long and short path protection channels can be used simultaneously.
- Protecting the working channel service and providing complete protection switching the technology provides a powerful M: ⁇ implementation of non-network protection switching.
- an object of the present invention is to provide a method for implementing a multi-pair and multi-ring network protection switching operation, which is reasonable and effective: ⁇ ring network protection switching definition and transmission in the process of switching.
- the present invention provides a method for implementing a multi-pair and multi-ring network protection switching operation, including:
- OK ⁇ ⁇ ring network protection switching switching request, switching request destination node, switching request source node, long and short path flag, switching bridge status, protected working channel channel number and protection channel usage information;
- the ring network node After receiving the signaling, the ring network node performs M: N ring network protection switching operation according to the information carried by the ring network node.
- the specific protection switching operation performs M: N ring network protection switching operation according to the channel number of the protected working channel and the usage information of the protection channel.
- the signaling is based on automatic protection switching APS protocol signaling, and the signaling may be carried by overhead bytes or protocol data unit PDU packets.
- the information carried in the signaling may further include:
- the switching request information further includes:
- Zone protection lock request and/or signal failure protection request information.
- the use of the protection channel includes:
- the state of the switching bridge includes:
- Alarm indication signal AIS remote defect indication RDI
- additional service occupation protection channel bridge switching, bridging and idle state.
- the step A described further includes:
- the network node that initiates the protection switching request determines the protection channel that can be occupied by the protection switching according to the locally saved protection channel usage information, and the protection status of the long and short path information of the protection channel and the state of the switching bridge.
- the step A1 described further includes:
- the protection channel that can be occupied is determined according to the priority of the switching request and the switching request priority corresponding to the applied protection channel.
- the step B described further includes:
- the signaling is transmitted in the ring network through a protection channel or a dedicated control channel in the ring network, and in the signaling transmitted through the dedicated control channel, the channel number of the protection channel that initiates the switching request is also required to be carried. .
- the step B described further includes:
- the signaling is transmitted through the protection channel or the dedicated control channel in the short-path direction and the long-path direction of the ring network, respectively, until the other end of the network node of the requesting segment.
- the step C described includes:
- the network node in the ring network After receiving the switching request, the network node in the ring network updates the usage information of the protection channel saved by the node according to the content information carried by the switching request signaling, and determines whether to use the corresponding protection channel according to the local switching request situation. If yes, continue to pass the switching request until the destination end of the section corresponding to the switching request, otherwise, terminate the switching request.
- the step C when the signaling is delivered through a dedicated control channel, the step C includes:
- the network node receives the APS protocol signaling PDU message, according to the check code to determine whether there is a bit error, if it occurs, discard the message, otherwise, step C2;
- C2 Query the protocol version number in the APS protocol signaling, and determine whether it matches the local protocol version number. If yes, perform step C3. Otherwise, report the alarm information.
- C3 Determine whether the PDU packet is lost according to the sequence number of the PDU packet. If yes, discard the packet. Otherwise, perform protection switching processing according to the switching request signaling.
- the present invention provides a format of APS protocol signaling, which includes various types of information necessary for performing a switching operation, and provides specific signaling using overhead byte bearer.
- the format, and the format of the signaling carried by the PDU message can be applied to both the protection channel and the dedicated control channel for transmission.
- the present invention provides a reasonable and effective transmission mode of the APS protocol signaling for the switching operation for the M: N ring network protection switching, so that the corresponding protection switching process can be smoothly performed, and the ring network protection is improved. Reliability.
- FIG. 1 is a schematic diagram of the format of signaling transmitted through a protection channel
- FIG. 2 is a schematic diagram of a dedicated control channel for M:N ring network protection
- FIG. 3 is a schematic diagram of a format of signaling transmitted using a dedicated control channel
- Figure 4 is a schematic diagram of signaling using a protection channel
- Figure 5 is a schematic diagram of signaling using a dedicated control channel
- FIG. 6 is a flow chart of an embodiment of performing an M:N ring network protection switching operation according to the channel number of the protected working channel and the protection channel usage information.
- the present invention provides a method for implementing an M : N protection switching operation in an M:N protection ring network, in which a format of signaling required for performing a protection switching operation and a manner of transmitting it in a ring network are defined, thereby The reliability of the M: N protection switching operation in the ring network is guaranteed.
- the method according to the present invention uses information required for the signaling bearer protection switching operation based on the APS (Automatic Protection Switching) protocol, and transmits the APS protocol signaling through the protection channel or the dedicated control channel.
- APS Automatic Protection Switching
- the following describes the format of the corresponding signaling and the method of transmission in the ring network when signaling transmission through the protection channel or the dedicated control channel.
- the information fields that the signaling needs to bear include: a switching request field, a destination node number field of the switching request, a source node number field of the switching request, and a long and short path flag.
- Field, reversed bridge status field, protected work The channel number field of the channel, and the usage field of the protection channel;
- the signaling bytes should be of sufficient length to be used in the 0TN (Optical Transport Network) standard ITU-T G.709 in four APS/PCC (Automatic Protection Switching/Protection Control)
- the requirements of the channel) overhead byte are as follows.
- the format of the signaling is as shown in FIG. 1.
- the destination node of the switching request, the switching request, the source node of the switching request, and the channel number of the protected working channel are respectively It is represented by 5 bits, the long and short path flags are represented by 1 bit, the state of the switching bridge is represented by 3 bits, and the use of the protection channel is represented by 8 bits, as shown in FIG.
- the value of all fields in the signaling refers to the value of the protection channel on the segment between the destination node of the switching request and the source node of the switching request; from Figure 1, the destination node number of the switching request and the source of the switching request It can be seen from the definition of the number of bits in the node number field that signaling in this format can support the protection switching operation of the ring network composed of 32 network nodes.
- the switching request refers to a switching request on a working channel to be protected by the switching channel on the segment, basically including various types of switching requests defined in SDH/S0NET, and also for LP-S (segment protection locking) ) Distinguish from the priority of SF-P (Signal Failure Protection), see Table 1 below:
- the long and short path fields are used to indicate that the switching request is: when the value is 1, it represents the long path, and when the value is 0, the short path is represented.
- the switching bridging state is the state on both end nodes of the protection channel of the segment, and the values of the inverting bridging state field are as shown in Table 2:
- the channel number of the working channel to be protected by the protection channel of the signaling can support up to 32 working channels;
- the usage of the protection channel is the usage of all protection channels in this section.
- the signaling in the format of Figure 1 can support up to 8 protection channels, that is, up to 8 : 32 ring network protection system;
- the protection channel usage field A - H corresponds to the use of protection channels 1 - 8 respectively. When the A - H field takes the value 1, it indicates the corresponding protection. The channel has been used. When the value is 0, it indicates that the corresponding protection channel has not been used.
- the corresponding overhead field may be extended on the basis of the field content information included in the signaling in FIG. 1, and the check field of the switching page is added to determine the switching page. It is correct to avoid the confusion of the protocol status.
- the peer end is the westbound ring switching page, and the local end must be the eastbound ring switching page.
- the sequence number field may be increased, and the network node receiving the signaling through the corresponding sequence number can more easily know whether the corresponding overhead byte is lost during the delivery process.
- a check code field may also be added in the signaling to ensure the accuracy of the received information.
- the protocol version number field may also be added in the signaling to avoid problems when different versions of the protocol are connected.
- the APS protocol signaling can be transmitted in the ring network when the protection switching operation is required.
- the specific transmission process is as follows:
- the protection channel is in the direction of failure.
- the short-track switching request overhead byte is sent, and the long-distance switching request overhead byte is sent in the opposite direction to the failure of the protection channel, and the overhead byte is filled according to the definition and the actual situation of the section.
- the network node on each ring After receiving the two overhead bytes, the network node on each ring first updates the protection channel usage table saved by the network element, such as the protection channel usage record table shown in Table 3.
- the intermediate network node determines whether the switching request is allowed to use the protection channel, and if allowed, the intermediate network node enters the through state (partial punch-through, full punch-through). Terminate this overhead byte if not allowed, send it as local The new overhead byte.
- the two end nodes in the failed zone determine the bridging and switching action of the protection channel according to the signaling transmitted on the received protection channel.
- a network node may receive signaling from different protection channels, and the protocol processor of the network node needs to be treated separately, so as to implement services on the relatively independent protection working channels of the m protection channels.
- the APS protocol signaling can also be transmitted through a dedicated control channel. As shown in FIG. 2, the outermost channel in the ring network represented by a thick double arrow line is a dedicated control channel.
- the signaling of the protection switching operation is transmitted through the dedicated control channel, the content of the information to be carried by the signaling is substantially the same as the content of the information word to be carried by the signaling transmitted through the protection channel, that is, still needed in the signaling.
- the signaling needs to carry the channel number of the protection channel that initiates the request.
- the specific format of the signaling is shown in FIG. 3 .
- the signaling is carried by the PDU packet, and the information carried in each field is: version number: used to implement interconnection between different protocol versions to prevent interconnection problems caused by incompatible versions;
- the channel number of the protection channel that initiates the request The segment between the destination node for indicating the switching request and the source node of the switching request attempts to protect with the protection channel, so the network element receiving the PDU signaling message needs to be based on The channel number determines whether the local protection channel is used to protect the higher priority request, and if so, the transmission of the message is aborted, if the local protection channel is idle (passing additional traffic) or the protection priority is low
- the switching request is to suppress the local switching request by the request in the received PDU signaling message, and set the local protection channel to be in the through state, and the PDU message (ie, PDU signaling) is continuously transmitted to The next network node, that is, the opposite direction to the received message.
- Msgid (identification of PD1 ⁇ ): It is used to transmit different messages to implement different functions. For example, the information carried by the Msgid field when performing protocol switching page check is PDU-ID-SWPG-VERIFY, if this message The information carried by the Msgid field when the APS switching protocol is used is PDU-1D-APS-PROTOCOL to extend the function of the PDU.
- Serial number of the PDU packet To prevent the loss of the PDU packet or the first-come-first-served Image is a measure to improve the reliability of switching.
- Destination node number The node number of the other endpoint of the zone that the node that initiated the switching request wishes to protect, which is a field required by the APS switching protocol.
- Switching status The same as in the previous overhead byte, to identify the status of bridging and switching, and also to pass AIS and RDI information, which is also required for the APS switching protocol.
- Source node number The node number of the network node that initiated the switch request. This field is also the field required by the APS switch protocol.
- Long and short path flag It is used to distinguish whether it is long-path or short-path APS switching signaling. This field is also the field required by the APS switching protocol.
- Switching request It is to identify the type of the switching request, which is the same as the definition in the previous delivery of the overhead byte, which is the field required by the APS switching protocol.
- 1-16 Identifies the usage of 16 protection channels, which is a bit-by-bit value. A value of 0 indicates that the channel is not used. A value of 1 indicates that the channel is used. A failure area in the section switching state. The protection channel of the segment is used, and the protection channel of the long path of the failure segment in the ring switching state is used.
- Channel number of the protected working channel Value 0-255, indicating the protection channel that initiated the switching request. Channel number of the working channel to be protected.
- BIP8 checksum It is used to prevent bit errors in the transmission of PDU packets and affect the robustness of the switchover.
- the dedicated control channel needs to reach all nodes on the ring network, and can satisfy point-to-point communication and signaling in a specified direction.
- the specific signaling transmission mode is as follows: First, according to the check code byte of the received signaling, it is seen whether the signaling has a bit error during the transmission process, and if it is a bit error, it is discarded; otherwise, the query protocol continues. The version number is displayed to see if it matches. If there is no match, the alarm is reported. If it matches, different PDU messages are processed differently according to the Msgid field.
- the present invention is only concerned with the processing of signaling PDU messages, that is, the location of the PDU-ID-APS-PROTOCOL message.
- the check field of the switch page has no effect, but in the right
- PDU-ID-SWPG- VERIFY message processing takes effect; for PDU message sequence number to prevent packet loss, the sequence number should be maintained for each protection channel of each segment, without comparison between each other Only the same segment is compared with the serial number of the protection channel to prevent packet loss; the channel number of the protection channel that initiates the request, the channel number of the protected working channel, and the usage field of the protection channel are used for the replacement channel.
- the local protection channel usage information table should be updated when receiving the PDU packet, as shown in Table 3.
- the values of other fields in the PDU are the fields required by the APS protocol. The processing of the field needs to be processed according to the APS protocol, and the usage of the protection channel needs to be referred to.
- the resource preemption processing of the protection channel may be performed, and then the preemption processing of the protection channel resource is performed.
- the process is described. Referring to Table 3, the specific protection channel resource preemption process is as follows:
- Table 3 shows a usage record record of each zone protection channel saved by a network node with six network nodes and four protection channel ring networks as examples.
- the overhead byte may be limited, and may not be transmitted. In this case, only the protection channels of different segments may be identified in Table 3. Whether it is used, if the unused value is 0, if it is used, the value is 1.
- the protection channel No. 3 between the BC segments is protecting the services in the working channel No. 8, and the protection channels of other segments are transmitting additional services.
- the service of the working channel is protected by the protection channel No. 2 on BC, CD, DE, EF, FA.
- the protection channel usage record table can be used to know the usage of the protection channel of the full ring. Therefore, when a new switching request occurs, the APS protocol processor running in the network node queries the table and follows the corresponding rules (ie, The resource occupation and preemption rules are performed by the protection switching process, and the corresponding APS signaling for controlling the protection switching operation is generated.
- the corresponding rule may be:
- a protection channel in the network node is partially through (that is, the protection channel is only used to transmit overhead, but is not used to protect the working channel), and this channel can be used for protection;
- the protection channel of a segment on the ring When the protection channel of a segment on the ring is used for segment switching, the state of the protection channel on the ring on other cells is partially through, and the protection channel in the partial punch-through state is preferentially used to improve protection.
- Channel utilization because one protection channel can be used for segment switching simultaneously in different segments on the ring;
- protection channel for protection If there is no protection channel in the partial punch-through state or idle state, that is, the protection channel of the segment is used to protect the service of the working channel, look for the protection channel in the zone protection, and use the long-path of the protection channel. Protection channel for protection;
- protection channels There may be several such protection channels. In this case, you need to choose among these protection channels.
- the rule of choice is as follows: If these protection channels have segment switching coexistence, the reverse of these channels must receive no pointing. The long-path segment switching request of the node; if the priority of the segment switching request is lower than the priority of the local latest switching request, the long path of the protection channel is used, if such a protection channel is further There are a few, the preemption has the lowest priority The long path of that protection channel.
- the local protection channel may be used for protection of the long path of other segments, that is, the channel of the network node is in the full punch-through state.
- These protection channels must receive a ring switching request whose long path does not point to the local node. If there is a lower than the local request in these switching requests, the switching is preempted, so that the protection channel is used for local segment protection.
- the network nodes are all in a state of partial punch-through, and the bridges and switches that have been established in other sections are released.
- the local protection channels are used for zone or ring switching protection, the long path of these protection channels is protected by the higher priority zone of other zones, then the local switching request cannot establish any Bridge and switch, the service on the working channel where this switching request occurs is not protected.
- FIG. 4 shows a 1:2 ring system, which is composed of four network elements, and two working channel failures occur between ABs. The first time you can use zone switching for protection, the switching is handled in the same way as the 1:1 ring protection switching; after the successful failure of the working channel No. 1, the new working failure occurs in the working channel No.
- the protection channel has been used, so the A node (assuming A is the initiating node for switching and B is the responding node for switching) tries to use the long path of the protection channel of the AB segment No. 1, that is, the BC, CD, and DA segments.
- the protection channel is ring protected, so A sends a long-path SF-R switching request in the west direction, simultaneously passes the channel number 2 of the protected working channel, and the usage of the protection channel: is used.
- the node D After receiving the SF-R switching request, the node D updates the table of the local protection channel usage. Because it is in the partial punch-through state, the protection channel 1 can be used, and the protection channel 1 enters the full punch-through state from the partial punch-through state. The signaling passes through.
- the processing of the node C is similar to the processing of the node D.
- the node A receives the long-distance switching request signaling sent by the B for bridging switching, and the node A also needs to send the long-path SF-R. Bridge switching signaling, node A receives this
- the long-path reversal clearing signaling is also bridged and switched, so that the service of the working channel is protected. As shown in the figure, the service transmitted through the thick-dashed path is lost due to the failure of the working channel. At the same time, after the protection switching process, the service can be transmitted through the thick solid path in the figure to protect the service.
- the signaling is transmitted as shown by a thin broken line in the figure.
- the thick solid line in the figure represents a dedicated control channel, and the APS protocol signaling of all protection channels is transmitted through the dedicated control channel.
- the dotted arrow line indicates the transmission path of the APS switching signaling.
- the processing after receiving the APS protocol signaling by each network element in FIG. 5 is basically the same as the manner of transmitting the signaling by using the protection channel, but between all the nodes that initiate the switching request and the nodes that respond to the switching request.
- the node needs to separately process the channel number field of the protection channel in the received switching signaling, that is, the signaling of different protection channel numbers is processed differently to ensure a relatively independent protection working channel of the protected channel, and It also needs to be processed according to the serial number of the signaling to avoid the problem of out-of-sequence of signaling caused by using the same control channel.
- the specific M:N ring network protection switching operation is performed according to the channel number of the protected working channel and the usage information of the protection channel.
- the internal table of each network node performing the flow of the embodiment shown in FIG. 6 stores the table shown in Table 4, the usage of each protection channel described in this table, including the protection channel used to protect that working channel, and the work What type of channel switching request is.
- the process shown in FIG. 6 involves two nodes, wherein the process on the left side of FIG. 6 relates to a node that initiates switching,
- the flow on the right side of Figure 6 relates to the node that responds to the switch.
- a network node A when a network node A generates a new switching request in step 1 (for example, working channel 5), the network node that needs to perform the switching operation of detecting the switching request queries the table 4 maintained by itself in step 2, Check if there is any unused protection channel. If yes, decide which protection channel to use according to the set rules. For example, decide to use the protection channel with the lowest number that is not used, for example, the protection channel numbered 3. Otherwise, according to the setting.
- the rule determines the protection channel that needs to be preempted, and releases the service originally protected by the channel, so that the channel acts as a protection channel to be used. Then, in step 5, the usage of the protection channel of Table 4 stored in the node is modified, and in step 6, the protocol signaling is sent through the protection channel of number 3.
- the corresponding switched network node B detects the new protocol signaling from the protection channel numbered 3 in step 7, and passes it to the protocol processor embedded in the node.
- the protocol processor first determines the reception in step 8. Whether the type of the protocol signaling is consistent with the protocol type of the node. If it is inconsistent, the alarm is reported and processed according to the default protocol type, and then step 10 is performed. Otherwise, it is directly determined in step 10 whether the selected protection channel is protected with the node. The usage of the channel conflicts. If there is a conflict, the alarm is reported in step 11, and the protection switching process is terminated. Otherwise, the protection channel usage of Table 4 of the node is modified in step 12, and the service is bridged, that is, the service of the working channel 5 is bridged to the protection channel 3. on. Then, in step 13, the protocol signal of the request type is reversed to the node that initiated the switching through the protection channel numbered 3.
- the network node B reports the alarm operation in step 9 as follows: First, check the contents of Table 4 saved by the node. If the protection channel with the number less than 3 has not been used for protection, report the alarm. If the number 3 is protected. The channel has been used to protect other working channels, and another alarm is reported. If it is not the above, update Table 4 of the node, and then change the channel number of the corresponding protected working channel of protection channel 3 to 5. The network node B updates the request field in the signaling to be sent to the content of the switching request field in the above received signaling.
- the network node A receives the protocol signaling of the reverse request in step 14, and updates the request of the working channel 5 in the table 4 of the node. Then, in step 15, the service is selected from the protection channel 3, and the service of the working channel 5 is bridged to the protection channel 3. Protocol signaling is then sent on protection channel 3.
- the network node B receives the protocol letter sent by the network node A through the protection channel 3 in step 16. Let, select the service from the protection channel 3, and at the same time send the protocol signaling to the network node A in step 17, the network node A receives the signaling in step 18 and then ends the protection process.
- an external protection lock is issued on a protection channel and the protection channel is detected locally, it is detected whether there is a protection channel that is not used. If there is a service bridge that switches the current protection channel to the unused protection channel with the lowest number. . If both are used, the switching request of the working channel protected by the protection channel is treated as a new switching request, and the following steps are taken: If the protection channel is not fully used, there is no protection channel preemption. If the protection channel used now is used and a new switching request is generated, query Table 4, find the lowest priority release of the switching request of a working channel from Table 4, and release the released protection channel. Protect the business on this work channel that generates new requests. If the switching requests for all working channels are the same, the protection channel with the smaller number has the highest priority.
- the supported protocol type may be single-ended or double-ended; it may be either recovery or non-recovery, but in order to effectively use the protection channel to deliver additional services, the default is double-ended, recovery.
- the supported protocol type may be single-ended or double-ended; it may be either recovery or non-recovery, but in order to effectively use the protection channel to deliver additional services, the default is double-ended, recovery.
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US11/568,579 US7924707B2 (en) | 2004-12-13 | 2005-12-13 | Method for realizing many to many protection switching of ring network |
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CNB2004100984878A CN100352226C (zh) | 2004-12-13 | 2004-12-13 | 实现m:n环网保护倒换操作的方法 |
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CN100426776C (zh) | 2006-10-30 | 2008-10-15 | 华为技术有限公司 | 在通道保护环上对工作业务进行编号的方法 |
US20080281987A1 (en) * | 2007-05-10 | 2008-11-13 | Nortel Networks Limited | Facilitating automatic protection switching for provider backbone network |
CN101453264A (zh) * | 2007-12-04 | 2009-06-10 | 华为技术有限公司 | 光网络的自愈保护方法及装置 |
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US7924707B2 (en) | 2011-04-12 |
CN100352226C (zh) | 2007-11-28 |
US20080107416A1 (en) | 2008-05-08 |
CN1791048A (zh) | 2006-06-21 |
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