WO2006131026A1 - Procede et systeme pour l'interconnexion d'anneaux de paquet redondants - Google Patents

Procede et systeme pour l'interconnexion d'anneaux de paquet redondants Download PDF

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Publication number
WO2006131026A1
WO2006131026A1 PCT/CN2005/000831 CN2005000831W WO2006131026A1 WO 2006131026 A1 WO2006131026 A1 WO 2006131026A1 CN 2005000831 W CN2005000831 W CN 2005000831W WO 2006131026 A1 WO2006131026 A1 WO 2006131026A1
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WO
WIPO (PCT)
Prior art keywords
site
ring
working
service
standby
Prior art date
Application number
PCT/CN2005/000831
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English (en)
Chinese (zh)
Inventor
Jun Cheng
Jian Lin
Original Assignee
Utstarcom Telecom Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Utstarcom Telecom Co., Ltd. filed Critical Utstarcom Telecom Co., Ltd.
Priority to PCT/CN2005/000831 priority Critical patent/WO2006131026A1/fr
Priority to CN2005800500533A priority patent/CN101194474B/zh
Publication of WO2006131026A1 publication Critical patent/WO2006131026A1/fr

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Classifications

    • 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]
    • H04L12/46—Interconnection of networks
    • H04L12/4637—Interconnected ring systems
    • 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 Resilient Package Ring (RPR) technology, and in particular to an interconnection method of an elastic packet ring and an interconnection system.
  • RPR Resilient Package Ring
  • the Resilient Packet Ring is a metropolitan area network technology that uses a dual ring structure to transfer data between multiple sites and is currently working by IEEE (The Institute of Electrical and Electronics Engineers) 802.17. Group standardization. Key features of the resilient packet ring include the following:
  • the transmission medium constituting the elastic packet ring RPR may be SDH (Synchronous Digital Hierarchy), SONET (Synchronous Optical Network), FDDI (Fiber Distributed Data Interface), or Gigabit (1GE or 10G). )and many more;
  • the site on the RPR needs to determine whether to strip or forward the packet.
  • the site For broadcast and multicast services, the site only needs to receive and forward the packet until the source station strips the packet from the ring. There is no need to copy a large number of packets to transfer to different destinations, which greatly saves bandwidth.
  • Class A Guaranteed minimum delay within the allocated bandwidth
  • Class B Guarantees a limited delay within the allocated bandwidth, allowing the service of the Class of Service (COS) to exceed the allocated bandwidth. At this time, the service exceeding the bandwidth is treated as Class.
  • C level C business is the same;
  • Class C Try to ensure the delay.
  • An RPR ring adopts a dual-ring structure, and two rings constituting the RPR ring simultaneously transmit data, support bandwidth sharing and statistical multiplexing in the ring, and strip the unicast packet at the destination site, so that the bandwidth utilization efficiency of the RPR ring network is greatly improved. improve.
  • the RPR ring is also capable of reclaiming allocated bandwidth and re-allocating unused bandwidth.
  • RPR's automatic topology discovery mechanism makes it easy to add, delete, and restore sites without any human intervention.
  • RPR provides two fast ring protection switching mechanisms: Wrapping and Steer ing. Both protection methods can achieve a 50-second ring protection time.
  • RPR Resource Streaming Protocol
  • Ethernet/router is connected between multiple rings to implement service exchange between multiple loops.
  • a single loop system shown in Figure 1, is typically used when there are few services and there is less need to interact or interact with other devices.
  • Figure 1 shows a typical application in IEEE 802.17.
  • RPR ring 10 is a schematic diagram of an RPR loop comprising four stations 101, 102, 103, 104.
  • the device may be a communication device, a switch, an optical transmission device, or a router.
  • the RPR site can be an RPR-enabled switch, a router or an SDH device, or an RPR-only device. Since the present invention relates to at least two RPR rings, the technical features of the single ring are not described in detail herein.
  • the RPR ring 21 includes four stations 211, 212, 213, 214; the RPR ring 22 includes four stations 221, 222, 223, 224.
  • the RPR ring 21 and the RPR ring 22 are interconnected by Ethernet, and the stations 212 and 224 are responsible for the conversion of the Ethernet and RPR frame formats.
  • the stations 212 and 224 are responsible for the conversion of the Ethernet and RPR frame formats.
  • Switches 24 and 26 can also receive local traffic from respective local devices 25 and 23, respectively, and traffic from other sites to the two local devices 25 and 23, respectively.
  • ring 310 includes four sites 311, 312, 313, 314; ring 320 includes four sites 321, 322, 323, 324.
  • the interconnection between the two RPR rings 310, 320 is accomplished by routers 301 and 302. It is up to the router 302 to decide which channel to send data to. If router 302 fails, router 301 determines which channel to send data to. If the channel between router 302 and site 312 or site 324 fails, it is recalculated by router 301, which is the path between router 301 and site 311 or site 321 .
  • the protection time of the cross-ring channel will depend on the protection time of the router, and the protection of the router.
  • the time is above the second level, and the carrier-class protection requirements cannot be achieved.
  • the carrier-class protection time is no more than 50 sec.
  • the service level CoS cannot be guaranteed between the rings 310 and 320. The reason is that the routers between the rings 310 and 320 pass through the router, and the router replaces the information of the data frame, resulting in adopting two. Information on the separation level of the layer cannot be passed to another loop.
  • the object of the present invention is to provide an RPR interconnection technology, which introduces the advantages of the RPR into the interconnection, and can realize the cross-ring service still has carrier-class protection capability on the working channel, in the cross-ring. It still has the same CoS of the original RPR ring.
  • the present invention provides a method for interconnecting resilient packet rings, including the steps of: providing at least a first resilient packet ring and a second resilient packet ring; providing at least a working site and a standby site on the resilient packet ring; Establishing a working channel between the stations to transmit the cross-ring service; establishing an alternate channel between the standby sites to serve as a backup for the working channel; assigning the first site identifier to both the working site and the standby site And two sites An identifier; wherein the first site identifier is for a cross-ring service and the second site identifier is for a local service.
  • the first site identifiers assigned on the same resilient packet ring are the same.
  • the method further includes: transmitting the service level of the cross-ring service in the first resilient packet ring unchanged into the second resilient packet ring.
  • the work site and the standby site on the first resilient packet ring are one site.
  • the method further includes: detecting whether the working station or the working channel is faulty; and if detecting the working station or the working channel is faulty, the standby station becomes a working station, and the standby The channel becomes the working channel.
  • the detecting step in the above method comprises: sending a message by the working station, and the standby station receives the message to detect a fault.
  • the standby station if the standby station does not receive the message from the working station within a certain time interval, it is determined that the working station is faulty, wherein the time interval may be configured in 50 ⁇ 50000 microseconds.
  • the status field of the message is modified to reflect a working channel failure.
  • the present invention also provides an interconnecting system of resilient packet ring, the interconnecting system at least comprising: a first resilient packet ring and a second resilient packet ring, wherein the resilient packet ring includes at least a working site and a standby site; Established between the working sites of the resilient packet ring for transmitting cross-ring services; and an alternate channel established between the standby sites of the resilient packet ring to serve as a backup for the working channel;
  • the working site and the standby site each have a memory for storing a first site identifier and a second site identifier that identify themselves; wherein the first site identifier is used for cross-ring service, and the second site identifier For local business.
  • the RPR interconnection technology of the present invention may have multiple channels between multiple RPR rings for protection purposes. If the working channel fails, the alternate channel starts and there is no broadcast storm problem because there is no loop on the logical topology.
  • the RPR interconnection technology of the present invention has a protection time of less than 50 secs when the channel fails, that is, the protection time has reached the protection time required by the carrier class.
  • This protection is independent of the fast protection technology of RPR technology, which means that it can communicate between multiple RPR rings. In the event of a fault, the protection time can still be To meet the required standards.
  • the interconnect technology of the present invention can achieve the same CoS between multiple RPR loops for the same service.
  • FIG. 1 is a schematic diagram of a technical solution of a single RPR loop of the prior art.
  • FIG. 2 is a schematic diagram of a technical solution for implementing interconnection between RPR rings by using an Ethernet method in the prior art.
  • FIG. 3 is a schematic diagram of a technical solution for implementing interconnection between RPR rings by using a router manner in the prior art.
  • FIG. 4A is a schematic diagram of an RPR loop interconnect system in accordance with one embodiment of the present invention.
  • FIG. 4B illustrates a schematic diagram of an RPR loop interconnect system in accordance with another embodiment of the invention.
  • Figure 5 is a schematic diagram illustrating the transmission of a message in accordance with a preferred embodiment of the present invention.
  • Figure 6 is a flow diagram illustrating the processing of messages in accordance with a preferred embodiment of the present invention.
  • Figure 7 illustrates a schematic diagram of cross-ring traffic between interconnected RPRs.
  • Figure 8 illustrates a schematic diagram of failure protection at an RPR work site in accordance with an embodiment of the present invention.
  • Figure 9 illustrates a schematic diagram of failure protection in an RPR interconnect channel in accordance with an embodiment of the invention.
  • Figure 10 illustrates a schematic diagram of failure protection of RPR ring and RPR interconnect channels in accordance with an embodiment of the invention.
  • FIG. 4A is a schematic diagram of an RPR loop interconnect system in accordance with one embodiment of the present invention.
  • the RPR ring interconnect system shown in Figure 4A includes two RPR rings 410 and 420.
  • the RPR ring 410 includes four sites 411, 412, 413, 414; and the RPR ring 420 includes four sites 421, 422, 423, 424.
  • the RPR site can be an RPR-only device, or an RPR-enabled switch, router, or SDH.
  • RPR ring interconnect system depicted in FIG. 4A includes two RPR rings, in practice, one RPR ring interconnect system may include more than two RPR rings, and may include multiple RPR rings, but at least There are two RPR rings to form an RPR ring interconnect system. Otherwise, it is the application technology scheme of the single loop of Figure 1.
  • each RPR ring shown in Figure 4A Site Although only four are drawn on each RPR ring shown in Figure 4A Site, but those skilled in the art should understand that the number of sites in the RPR ring of the present invention is not limited to four, and the specific number is determined according to actual service requirements. There may be multiple sites on each RPR ring. Of course, the number of sites on the rings 410, 420 may be the same or different. However, there should be at least two sites on each RPR, otherwise there is no practical meaning to an RPR ring that includes only one site.
  • the RPR ring has an automatic topology feature. Whenever a station is added or revoked in the RPR ring 410, 420, the RPR ring 410, 420 can automatically recognize the newly added site and the revocation of the existing site, so that it is not needed Any artificial intervention.
  • An RPR interconnect system consists of interconnecting two RPR rings through interconnected channels.
  • the interconnect channels that are connected to form the RPR interconnect system have both a working channel 440 and an alternate channel 430.
  • RPR rings 410, 420 are interconnected by stations ⁇ 411, 421 ⁇ and ⁇ 412, 424 ⁇ , wherein interconnect channel 440 between 412 and 424 is a working channel, and interconnect channel 420 between stations 411 and 421. It is an alternate channel.
  • Sites 412 and 424 are workstation points for maintaining the working channel's normal operation; Sites 411 and 421 are alternate sites for maintaining the normal operation of the alternate channel.
  • the interconnection channel may be connected in a wired manner, such as a network such as the Internet, or in a wireless manner.
  • the interconnection channel may be, for example, a coaxial cable, an optical fiber, or the like, and may also have an interconnection network between the interconnection channels.
  • the work site and the standby site shown in FIG. 4A are adjacent in position, but embodiments of the present invention do not require that the two sites must be adjacent.
  • the working site and the standby site for interconnecting the two RPR rings can be set to be adjacent in position, because if one of the sites fails, then a cross-ring service, at the working site and If the standby sites are adjacent to each other, they may have the same path as the original path. If the sites are not set to be adjacent, the path to be taken by the cross-ring service may become longer, so that the cross-ring service is from the source. The time taken by the site to the destination site becomes longer.
  • the work site and the standby site have the same site identifier ID (Ident if ication ) for cross-ring services.
  • the site identifier is identified by a Media Access Control sub-layer MAC (Media Access Control) address.
  • MAC Media Access Control
  • Other addresses or ways may be used as the identifier ID of the identification site, or an identifier may be customized. The way, as long as you can uniquely identify a site.
  • Each site's own site identifier ID is stored in its own memory.
  • the memory that each site has can be implemented in various forms of readable and writable memory.
  • the sites of the RPR rings 410, 420 have independent IDs, and the site IDs they have may be the same or different, and they do not need to know each other's site ID.
  • the station 412 and the station 424 are working sites of the interconnection system, are in a working state, receive and transmit services according to the RPR regulations; and the stations 411 and 421 are standby sites of the interconnection system.
  • the stations 411 and 421 are standby sites of the interconnection system.
  • all cross-ring services passing through the standby site are only listening and not processed.
  • the site 412 includes: a receiving device, configured to receive service data, and a service type determining device, configured to determine a service type of the service data received by the receiving device, whether the local ring service, the local service, or the cross-ring service. If it is the local ring service, the service data is sent to the local ring service processing device of the site 412 to process the local ring service according to the RPR and send it.
  • the cross-ring service is sent to the service level filling device, and the service level COS information of the cross-ring service in the local ring is filled into the cross-ring service frame, and then The filled cross-ring traffic frame is sent to the cross-loop traffic processing device for corresponding processing and sent to the working channel 440, which in turn is transmitted to the RPR ring 420.
  • the received data service is a local service
  • the service data is sent to a local service processing device, and the local service data is processed and sent to the local device 43.
  • the working station 424 on the RPR ring 420 also has the same arrangement as described above for the station 412 on the RPR ring 410.
  • Site 411 is the standby site and is in the through state for cross-ring services.
  • the station 411 has a listening device for intercepting all services passing through the site, and if it is found to be a local service, it is handed over to the local service device for processing, and if it is a cross-ring service, the received cross-ring service is not processed. data.
  • the above operation for populating the service level CoS information of the ring to the cross-ring service frame may also be performed by the cross-ring service processing device.
  • the operation is performed by the service level filling device.
  • a pair of site detection mechanisms are run on the work site 412 and the alternate site 411 to maintain communications.
  • the site 412 has state detecting means for determining whether the peer site - that is, the standby site 411 is operating normally.
  • the station 411 also has status detecting means for detecting whether the opposite site 412 is operating normally.
  • Site 412 and Site 411 The respective status detecting devices can be operated simultaneously to detect whether the opposite site is working properly.
  • only the state detecting means of the standby site 411 detects whether the working site 412 is operating normally.
  • the state detecting means of the standby site 411 finds that the work site 412 has failed, it turns itself into a work site.
  • the original work site 412 becomes a standby site in nature, and when its fault disappears, its own state detecting device acts as a standby site to detect whether the peer site is working normally.
  • the alternate site 411 includes a timer for timing. This timer is only activated on the site that is the standby site when the RPR interconnect system is initially running.
  • the site 411 is a site that serves as a standby site when the RPR interconnection system is initially operated.
  • the state detecting device of the standby site 411 finds that the peer site 412 is faulty, it changes itself to the working site, and when it detects that the original working site returns to normal, the timing of the activation is activated. And set an initial time for the timer. The timer begins to count down the initial time.
  • the station 411 itself becomes the identity of the standby site again, and the station 411 goes to the site 412 (at this time 412 is qualitative in nature
  • the alternate site sends a message to request the site 412 to restore the identity of the original working site. If the original work station fails again before the set time has not reached zero, the timer is stopped, and the timer is reactivated and the initial time is reset only when it is detected again that the original work station is restored.
  • the work site 424 and the standby site 421 on the RPR ring 420 also have the above-mentioned site detection mechanism to discover the status of the peer site and detect whether the peer site works normally.
  • the station 411 on the RPR ring 410 will receive all the services with the destination ID of the site ID as the local service.
  • the service type determining means of the station 411 determines that the destination station ID of the received service data is the service of S2
  • the station 411 transmits the service data to the local service processing device for processing the received local service and This service is sent to the local device 41.
  • the service type judging device of the station 411 determines that the received data is a broadcast/multicast service
  • only the broadcast/multicast service is transmitted to the local service processing device, and the local service processing device receives and processes the broadcast.
  • the multicast/multicast service is sent to the device 41 so that the broadcast/multicast service is not sent to the cross-ring channel.
  • site 421 of ring 420 its site identifier for local traffic is S6, for For the cross-ring service, its site identifier is S5, and the local service is sent to the local device 42.
  • site identifier for cross-ring traffic is S4. It should be understood that although the site identifier for the local service is not drawn for the site 424, this is only to make the description simple, in particular, when the site 424 is connected to the local device, a local site can be set up for it. Identifier, to target local business.
  • the receiving device of station 412 receives traffic with destination site identifier IDs Sl, S3, and S4. If the destination station identifier ID of the service data received by the receiving device is S4, the processed local service is transmitted to the device 43 by its local service processing device, if the service type determining device of the station 412 determines from the receiving device.
  • the destination station IDs of the received service data are S1 and S4, and the received service data is sent to the service level filling device of the site 412, and the received service data is filled in the service level CoS information of the local ring to the cross-ring service frame.
  • the filled cross-ring service frame is then sent to the cross-ring service processing device, and then the cross-loop service processing device sends the service frame to the RPR ring 420, and then is processed by the site on the RPR ring 420.
  • the traffic frame maps the CoS classification result on the RPR ring 410 to the RPR header on the RPR ring 420.
  • the local service processing device transmits the service data to the local device 43 and the work channel 440, respectively.
  • Figure 4B illustrates a schematic diagram of an RPR loop interconnect system in accordance with another embodiment of the invention.
  • the work site and the backup site are combined into one.
  • Site 412 in Figure 4B assumes the roles of both the work site and the standby site, but in an RPR interconnected system, only one composite site exists on one RPR ring - the work site and the standby site are combined into one. Such a composite site is not allowed on another RPR ring of the interconnect.
  • a site 412 in which the work site and the standby site are merged on the RPR ring 410 is shown.
  • the interconnecting channel 440 of the site 412 of the ring 410 and the site 424 of the ring 420 is the working channel
  • the site 412 of the ring 410 and the site 421 of the ring 420 The interconnection channel 430 is an alternate channel.
  • the sites 412 on the ring 410, S3 is the site ID for the cross-ring service
  • S4 is the site ID for the local service
  • the service from the working channel 440 and the backup channel 430 the site identification For S3.
  • the service is directly sent to the cross-ring service processing device; if the broadcast/multicast service is received, it is sent to the cross-loop channel processing device and the local service processing device.
  • the cross-loop channel processing device sends the service only to the work channel. Road.
  • the site 412 of the RPR ring 410 will not need to run the site detection mechanism, only need to receive and transmit cross-ring services on the working and alternate channels established between the site 421 and the site 424 on the RPR ring 420. . If station 424 indicates that interconnect channel 440 is a working channel, then RPR ring site 412 will not send traffic to interconnect channel 430. Since 424 and 421 work together, there is no case where the interconnect channel 430 and the interconnect channel 440 are in the same state.
  • Site 421 on ring 420 is the alternate site and site 424 is the working site.
  • the operation of stations 421 and 424 operates as described above with reference to Figure 4 and will not be described again.
  • FIG. 5 is a schematic diagram illustrating the transmission of a message in accordance with a preferred embodiment of the present invention.
  • a pair of site detection mechanisms are run on the work site 412 and the alternate site 411 to maintain communications.
  • the work site 412 and the standby site 411 use the message mode to determine whether the peer site is working properly.
  • the respective status detecting means of the working station 412 and the standby station 411 detect whether the opposite station and the cross-ring channels 430, 440 are operating normally by transmitting a message.
  • the standby site 411 becomes a work site in nature, receives and transmits the service according to the RPR, and the original work site 412 becomes the standby site in nature.
  • the listening device listens.
  • the process of transmitting a message is described below with RPR ring 410, which is also applicable to RPR ring 420.
  • the MSG-A message 51 is sent between the status detecting device of the working station 412 and the status detecting device of the standby station 411.
  • the MSG-A message 51 can be sent only by the working site 412, and the standby site 411 only detects if the working site is valid, i.e., is only responsible for receiving the MSG-A message 51 without transmitting the message. If the alternate site 411 does not receive the MSG-A message 51 from the site 412 within a certain time interval, the site 412 is considered to be faulty.
  • the message contains a status field indicating whether the interconnect channel is working properly.
  • the time interval can be configured between 50 and 50000 microseconds.
  • the cross-ring sites 411, 412 send MSG-A messages to each other at a frequency of 50 ⁇ 50000 microseconds.
  • the quality of the working channel 440 is detected by the corresponding device. After detecting the status of the working channel 440, the device puts information on whether the working channel 440 is working properly into the MSG-A frame. The flow description of the message mechanism is shown in detail below in conjunction with Figure 6.
  • FIG. 6 is a flow chart illustrating the process of processing a message in accordance with a preferred embodiment of the present invention.
  • Fig. 6 it is judged by the cross-ring site 412 or 411 shown in Fig. 5 whether or not the peer-over-the-span site 411 or 412 operates normally.
  • both the work site and the standby site send the MSG_A message 51 and perform the following process.
  • the MSG-A message 51 is sent by the working site 411 on the sexual shield, and the MSG is received from the site 411 by the 412 which is the standby site in nature. -A message 51.
  • step S601. the process proceeds to step S602, in which the state detecting means of the standby site 411 receives the MSG-A message 51 from the work site 412. If the state detecting means does not receive the MSG-A message 51 from the station 412 within a certain time interval, the process proceeds to step S604.
  • step S604 the standby site 411 determines that the work site 412 has failed. Then, the process proceeds to step S606.
  • the alternate site 411 waits for the message duration from the peer site 412 to be configurable, ranging from 50 to 50000 microseconds, with a preferred value of 2000 microseconds.
  • step S603 if the status field in the MSG-A message 51 indicates that the working channel has not failed, the process returns to step S602 to continue the above process; if the standby site 411 is from the received MSG-A message 51 Look for the status field to determine if work channel 440 is working properly. If the status field in the MSG-A message 51 indicates that the working channel 440 has failed, the process proceeds to step S605. At step S605, the standby site 411 determines that the work channel 440 responsible for the workstation point 412 has failed.
  • step S606 the work site 412 becomes a standby site in nature and is only responsible for interception.
  • the alternate site 411 becomes a work site in nature to transport the cross-ring service.
  • the working channel 440 also becomes a backup channel in nature, and the alternate channel 430 becomes a working channel in nature to carry the cross-ring service.
  • the process returns to step S602 to continue the above process.
  • Figure 7 illustrates a schematic diagram of cross-ring traffic between interconnected RPRs.
  • Figure 7 illustrates, by way of example, an illustration of processing cross-ring services and local services on a worksite 412.
  • a in Figure 7 represents a cross-ring service from the site 414 in the RPR ring 410 to the site 422 in the RPR ring 420.
  • the site identifier IDs of stations 411 and 412 on RPR ring 410 are both S3.
  • traffic a arrives at RPR ring 420 via working channel 440 between stations 412 and 424.
  • the site 414 learns the address, and sets the destination site identifier ID of the service a on the RPR ring to S3.
  • the site 412 After receiving the service a with the destination site identifier S3, the site 412 sends the service to the working channel 440, and the specific device that implements the cross-ring service is described in detail in FIG. 4A.
  • the site 424 on the RPR ring 420 receives the cross-ring service-service a, the service a is sent to the destination site 422 according to the RPR normal procedure. In this process, stations 411 and 421 do not receive traffic with the destination site identifier S3, and others are processed according to normal procedures.
  • the work site 412 puts the classification information of the service level CoS (including service levels A, B, and C) of the ring into the frame header of the cross-ring service a, and transmits it to the RPR loop through the working channel 440. 420.
  • the work site 424 on the RPR loop 420 parses the frame header and maps it to the RPR classification information to implement CoS sharing.
  • Service b represents local data traffic from site 414 to device 43.
  • the site 414 learns the address, and sets the destination site identifier ID of the service b on the RPR ring to S4.
  • the station 412 receives the service b with the destination site identifier S4
  • the service is sent to the local device 43, and the specific device for realizing the local service is described in detail in FIG. 4A.
  • stations 411 and 421 do not receive the service with the destination site identifier S3, and others are processed according to the normal procedure.
  • Figure 8 illustrates a schematic diagram of work site failure protection at the RPR ring in accordance with an embodiment of the present invention.
  • Figure 8 illustrates, by way of example, the cross-ring service and local service processing at the time of the work site 412 failure.
  • service a represents a cross-ring service from site 414 to site 422.
  • service a arrives at RPR ring 420 via working channel 440 between stations 412 and 424.
  • the standby site 411 periodically receives the MSG_A message 51 from the work site 412 to determine whether the work site 412 has failed based on whether the MSG-A message 51 was received from the work site 412 within a certain time interval. If the standby site 411 does not receive the MSG-A message 51 within the configured time interval, then it is determined that the work site 412 has failed, then immediately transitions to the working site, and the station 421 in the RPR ring 420 is notified to do the same transition. Accordingly, the alternate channel 430 also becomes a working channel in nature to transmit cross-ring traffic. At this time, the station 411, which is a work station in nature, receives the cross-ring service data whose destination identifiers are S3 and S1.
  • the station 411 puts the classification information of the service level CoS (including the service levels A, B, and C) of the ring into the cross-ring service.
  • the frame header of a is transmitted to the RPR loop 420 through the working channel 430.
  • the work site 4 on the RPR loop 420 parses the frame header and maps it to the RPR classification information to implement CoS sharing.
  • the station 424 does not receive the service with the destination site identifier S3, and the other processes are processed according to the normal process.
  • the service data whose destination identifier is S4 is discarded.
  • Figure 9 illustrates a schematic diagram of RPR cross-loop failure protection in accordance with an embodiment of the invention.
  • Figure 9 illustrates, by way of example, the working channel 440 failure, for cross-ring services and local service processing.
  • service a represents a cross-ring service from site 414 to site 422.
  • service a arrives at RPR ring 420 via working channel 440 between stations 412 and 424.
  • the alternate site 411 periodically receives the MSG-A message 51 from the working site 412.
  • the working site 412 detects that the working channel is invalid.
  • the detection mechanism please refer to the corresponding detection mode of Layer 2.
  • the second layer detection method please refer to www.ieee.org, modify the status field in MSG-A 51 to indicate the The working channel is invalid and then sent out.
  • the station 411 After receiving the MSG-A message 51, the station 411 analyzes the status field in the MSG_A message. If the site 411 finds that the status field in the MSG-A message indicates that the working channel has expired, it immediately turns itself into a working site and notifies the site 421 in the RPR ring 420 to make the same transition (the notification mechanism can utilize Layer 2 LACP or other For related protocols, inform the port that it is invalid.
  • the notification mechanism can utilize Layer 2 LACP or other For related protocols, inform the port that it is invalid.
  • Layer 2 LACP please refer to the website ht tp: //www. ieee802.org/3/ad/.
  • the site 411 becomes a work site in nature to transmit the service cross-ring service, and the site 421 on the notification ring 420 also performs a corresponding transition. Accordingly, the cross-ring channel 430 becomes a working channel in nature to transmit the cross-ring service.
  • the station 411 receives the cross-ring service with the site identifiers S3 and S1, including the service a.
  • the station 411 puts the classification information of the service level CoS (including the service levels A, B, and C) of the ring into the frame header of the cross-ring service a. It is transmitted to the RPR loop 420 through the cross-ring channel 430.
  • the work site 421 on the RPR loop 420 parses the frame header and then maps it CoS sharing is implemented in the classification information of the RPR.
  • the cross-ring service a from the RPR ring 410 is transmitted by the station 421 to the destination site 422 in accordance with the normal RPR procedure.
  • site 414 there is no known channel conversion process as described above.
  • service a the destination site identifier is always S3.
  • the local service b since the site 412 itself has not failed, the local service b is processed in accordance with the procedure as shown in Fig. 7, and then transmitted to the local device 43.
  • Figure 10 illustrates a schematic diagram of fail-safe protection of RPR ring and RPR interconnect channels in accordance with an embodiment of the invention.
  • Figure 10 illustrates, by way of example, the channel failure between station 414 and station 411 of RPR ring 410, while working channel 440 also fails, for cross-ring services and local service processing.
  • service a represents a cross-ring service from site 414 to site 422. Under normal circumstances, service a arrives at RPR ring 420 via working channel 440 between stations 412 and 424.
  • the protection time is one of the time of RPR ring protection and the time of interconnected channel time.
  • the protection time is RPR ring protection time.
  • the RPR ring protection time takes 15 seconds
  • the cross-ring protection time takes 20 seconds
  • the protection time for the service is 20 seconds.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

La présente invention concerne un système destiné à l'interconnexion d'anneaux de paquet redondants (RPR), qui comprend au moins: le premier et le second RPR, lesdits RPR étant composés d'au moins la station de travail et la station de veille; le canal de travail pour transmettre le service d'anneau de croisement est établi entre les stations de travail du RPR et la station de veille pour l'attente du canal de travail est établie entre les stations de veille du RPR; lesdites stations de travail et de veille possèdent une mémoire permettant de stocker le premier et le second identificateur de station qui s'identifient elles-mêmes: le premier identificateur de station sert pour le service d'anneau de croisement et le second pour le service local.
PCT/CN2005/000831 2005-06-10 2005-06-10 Procede et systeme pour l'interconnexion d'anneaux de paquet redondants WO2006131026A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2005/000831 WO2006131026A1 (fr) 2005-06-10 2005-06-10 Procede et systeme pour l'interconnexion d'anneaux de paquet redondants
CN2005800500533A CN101194474B (zh) 2005-06-10 2005-06-10 弹性分组环的互联方法以及***

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2005/000831 WO2006131026A1 (fr) 2005-06-10 2005-06-10 Procede et systeme pour l'interconnexion d'anneaux de paquet redondants

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WO2006131026A1 true WO2006131026A1 (fr) 2006-12-14

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030118041A1 (en) * 2001-12-26 2003-06-26 Alcatel Method for interconnecting a number of RPR rings in a wide area RPR network
EP1328090A1 (fr) * 2002-01-09 2003-07-16 Alcatel Procédé de découverte de topologie, système et noeud
CN1547362A (zh) * 2003-12-09 2004-11-17 上海交通大学 弹性分组环网的多环互连传输方法
WO2005015851A1 (fr) * 2003-08-06 2005-02-17 Fujitsu Limited Noeud, carte d'interface rpr et systeme de reseau optique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030118041A1 (en) * 2001-12-26 2003-06-26 Alcatel Method for interconnecting a number of RPR rings in a wide area RPR network
EP1328090A1 (fr) * 2002-01-09 2003-07-16 Alcatel Procédé de découverte de topologie, système et noeud
WO2005015851A1 (fr) * 2003-08-06 2005-02-17 Fujitsu Limited Noeud, carte d'interface rpr et systeme de reseau optique
CN1547362A (zh) * 2003-12-09 2004-11-17 上海交通大学 弹性分组环网的多环互连传输方法

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