WO2008028377A1 - Procédé et système de protection redondante de dispositifs passerelles entre anneaux, sur anneau souple à commutation par paquet en mode passerelle - Google Patents

Procédé et système de protection redondante de dispositifs passerelles entre anneaux, sur anneau souple à commutation par paquet en mode passerelle Download PDF

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Publication number
WO2008028377A1
WO2008028377A1 PCT/CN2007/000618 CN2007000618W WO2008028377A1 WO 2008028377 A1 WO2008028377 A1 WO 2008028377A1 CN 2007000618 W CN2007000618 W CN 2007000618W WO 2008028377 A1 WO2008028377 A1 WO 2008028377A1
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WIPO (PCT)
Prior art keywords
cross
ring
bridge
bridge device
protection group
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PCT/CN2007/000618
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English (en)
Chinese (zh)
Inventor
Yilong Zhang
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008028377A1 publication Critical patent/WO2008028377A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Definitions

  • the present invention relates to the field of metropolitan area network communication technologies, and in particular, to a method and system for redundancy protection of bridge mode resilient packet ring cross-ring bridge equipment.
  • Packet Ring is used by more and more metropolitan area networks for its advanced technology, investment effectiveness, superior performance, and high quality and reliability of service quality.
  • RPR technology combines the intelligence of IP, the economics of Ethernet and the high broadband efficiency and reliability of fiber-optic ring networks. It is a ring network composed of packet switching equipment.
  • a ring network composed of RPR technology is called an RPR ring network, and can be called an RPR ring.
  • a packet switching device on a ring network is called an RPR device.
  • the RPR device uses the 48-bit MAC (Media Access Control) address used in the Ethernet as the address identifier to uniquely identify the RPR device and carry the Layer 2 Ethernet packet through the Ethernet Over RPR mode.
  • the RPR ring may also be referred to as an RPR bridge ring or a bridge mode RPR ring.
  • the device on the RPR bridge ring can also be called an RPR bridge device.
  • the MAC address on the RPR bridge device can also be called the RPR MAC address. As shown in Figure 1, a schematic diagram of the structure of two RPR bridge rings intersecting two RPR bridge devices is depicted.
  • RPR bridge rings there are two RPR bridge rings, which are RPR bridge ring 1 and RPR bridge ring 2, respectively.
  • There are four RPR bridge devices on each RPR bridge ring and the RPR bridge ring 1 and the RPR bridge ring 2 intersect at the RPR cross-bridge device 1 and the cross-ring bridge device 2.
  • the cross-ring bridge device is connected to two RPR bridge rings at the same time, and is responsible for forwarding data packets between the two RPR bridge rings.
  • the RPR cross-bridge device cartridge is referred to as a cross-bridge device in the following description, and the RPR bridge device cartridge is referred to as a bridge device.
  • the RPR cross-ring bridges intersect at the two RPR bridge rings.
  • the device generates a loop, that is, a loop occurs between the RPR cross-ring bridge device 1 and the RPR cross-bridge device 2 as shown in FIG. 1, and a broadcast storm occurs.
  • the prior art method is through STP (Spanning Tree Protocol) or RSTP (Rapid Spanning Tree Protocol).
  • STP Shorting Tree Protocol
  • RSTP Rapid Spanning Tree Protocol
  • the spanning tree protocol is used to perform link reduction to generate a minimum spanning tree without loops.
  • the packets on the Layer 2 Ethernet are forwarded according to the minimum spanning tree to prevent loops in Layer 2 network communication.
  • STP or RSTP recalculates the minimum spanning tree and obtains a new forwarding tree to ensure normal service after the fault occurs.
  • the STP and RSTP methods can solve the loop problem between the cross-ring nodes, the STP and RSTP convergence speed is slow. Even the RSTP can only reach the second-level level, thus causing the RPR bridge ring. After the failure occurs, the recovery time of the service increases, and the carrier-class requirements cannot be met.
  • the prior art forms a protection group by setting a cross-ring bridge device that is simultaneously connected to two RPR bridge rings, and sets a protection group.
  • a cross-ring bridge device is used as the primary cross-ring bridge device, which is responsible for forwarding data packets between two RPR bridge rings.
  • priority is set for the cross-ring bridge device to perform the primary standby state of the cross-ring bridge device. Switching and control; and, when a device or link fails on the Layer 2 network, the RPR bridge ring can be quickly restored through the switching and control of the primary and backup states of the cross-ring bridge device, ensuring the RPR bridge ring.
  • the normal use of the service ensures that the impact of the protection switching time on the service meets the requirements of the carrier class.
  • the problem of loop avoidance and fault recovery when the two RPR bridge rings intersect can be solved, and in the actual networking, especially at the location of the access network, a convergence A plurality of rings are connected under the ring, that is, there are cases where at least three RPR rings intersect.
  • the prior art method cannot solve the problem of rapid recovery of loop avoidance and failure when at least three RPR rings intersect.
  • the embodiment of the invention provides a method and a system for redundancy protection of a bridge mode elastic packet ring bridge device, which is used for the elastic packet ring corresponding to each intersection point when at least three elastic packet rings intersect at multiple points
  • the primary and backup states are controlled. After the RPR bridge ring is faulty, the RPR bridge ring fault is quickly recovered and loops are avoided. This ensures the normal use of services on the RPR bridge ring.
  • the embodiment of the invention provides a method for redundancy protection of a bridge mode elastic packet ring spanning bridge device, the method comprising:
  • the at least two cross-ring bridge devices are configured as a protection group, and the cross-ring bridge device is connected to at least three resilient packet rings, and a cross-ring bridge device in the protection group is configured as a primary cross-ring bridge device, which is responsible for Forwarding packets, others are spare cross-ring bridge devices;
  • the embodiment of the invention further provides a system for redundant protection of a bridge mode resilient packet ring bridge device, the system comprising:
  • At least two cross-ring bridge devices connected to at least three resilient packet rings the cross-ring bridge devices form a protection group
  • a cross-ring bridge device in the protection group is a primary cross-ring bridge device, which is responsible for forwarding The message, the other is the standby cross-ring bridge device.
  • another cross-loop bridge device having the cross-ring bridge forwarding capability in the protection group serves as the primary cross-ring bridge device.
  • a cross-ring bridge device corresponding to each intersection point of at least three resilient packet rings is formed into a protection group, and a cross-ring bridge device in the protection group is configured as a primary cross-ring bridge device, which is responsible for forwarding packets.
  • the other is a backup cross-ring bridge device; when the protection group changes, it is determined that another cross-ring bridge device having a cross-ring bridge forwarding capability is a primary cross-ring bridge device.
  • FIG. 1 is a schematic structural view of two RPR bridge rings intersecting in the prior art
  • FIG. 2 is a schematic structural view showing intersection of a plurality of RPR bridge rings in the present invention
  • 4 is a flowchart of triggering redundancy protection when a primary cross-ring bridge device receives a control message according to the present invention
  • FIG. 5 is a flow chart of triggering redundancy protection when a standby cross-ring bridge device receives a control message according to the present invention
  • FIG. 6 is a flow chart of the redundancy protection triggered by the topology convergence event in the primary cross-ring bridge device of the present invention
  • Figure ⁇ is a flow diagram of the standby cross-ring bridge device triggered by the topology convergence event in the present invention
  • FIG. 8 is a flow chart of redundancy protection of a cross-ring bridge device after a timer expires in the present invention
  • FIG. 9 is a schematic block diagram of a cross-loop bridge device in an embodiment of the system of the present invention.
  • At least two cross-ring bridge devices are formed into a protection group, the cross-ring bridge device is connected to at least three RPR bridge rings, and a cross-ring bridge device is determined as a primary cross-ring bridge device in the protection group.
  • the rest are spare cross-ring bridge devices.
  • the primary cross-ring bridge device is responsible for forwarding data packets between the RPR bridge rings.
  • the standby cross-ring bridge device only needs to be responsible for the RPR bridge ring when the primary cross-ring bridge device fails. Forwarding of data packets.
  • the primary cross-ring bridge device is responsible for forwarding data packets between multiple RPR bridges.
  • the forwarding of data packets between multiple RPR bridges is as follows: According to the configuration of the primary cross-ring bridge device, for example, forwarding the service type of the 4 ⁇ text, all or part of the forwarding Data message between RPR bridge rings.
  • FIG. 2 it is a networking diagram of multiple RPR bridge rings intersecting two cross-ring bridge devices according to an embodiment of the present invention.
  • the convergence ring intersects the sub-ring 21, the sub-ring 22, and the sub-ring 23 at two points, and the two intersection points in the figure correspond to the respective cross-ring bridge devices.
  • FIG. 3 it is a schematic diagram of a logical networking when four RPR bridge rings intersect with two cross-ring bridge devices in the embodiment of the present invention.
  • the cross-ring bridge device 301 and the cross-ring bridge device 302 form a protection group, and the ring 31, the ring 32, the ring 33 and the ring 34 simultaneously intersect at the cross-ring bridge device 301 and the cross-ring bridge device 302.
  • the reason why the RPR bridge ring and the cross-ring bridge device are connected by a two-wire in the figure is because the RPR bridge ring is a bidirectional ring.
  • the dotted line in the figure indicates the RPR bridge ring and the cross-ring bridge device.
  • the association is blocked in the logical structure, that is, the data packet between the cross-ring bridge device and the blocked RPR bridge ring is interrupted. Therefore, as shown in FIG. 3, when the actual network is running, In the network structure, only the cross-ring bridge device 301 is actually responsible for data forwarding between the four RPR rings, that is, the current state of the cross-ring bridge device 301 is the active state, and the current state of the cross-ring bridge device 302 is Standby status.
  • an RPR ring that is logically related to both the cross-ring bridge device 301 and the cross-ring bridge device 302 described in the figure is referred to as a primary ring, that is, the ring 31 described in FIG. Use the ring.
  • the partition between the bridge device 302 and the ring 32 is cancelled, of course, when After the fault is recovered, that is, when the ring 32 can be used normally, the partition between the cross-ring bridge device 302 and the ring 32 needs to be restored.
  • the cross-ring bridge device 301 and the cross-ring bridge device 302 can only have a logical association at most on one RPR bridge ring, that is, only one cross-ring bridge device must be responsible for the cross-ring service data forwarding at the same time.
  • the primary cross-ring bridge device is invalid, whether it needs to be re-selected, on the one hand can be reflected by the topology convergence of the RPR bridge ring. Since the topology convergence of the RPR bridge ring only takes 50 milliseconds, after the topology change of the RPR bridge ring, the time of re-determining the new primary spanning bridge device by using the RPR bridge ring unique topology discovery will be less than 100 milliseconds. On the other hand, it can be determined by the information of each cross-bridge device protection group in the protection group stored in the node information table on each cross-bridge device.
  • a node information table for storing protection information of each cross-ring bridge device in the protection group is set.
  • node information is set in each span bridge device of the protection group.
  • the table, the node information table includes at least: a device ID, a device priority, a current state of the device, and RPR MAC information of multiple interfaces connected to the cross-ring bridge device.
  • the cross-ring bridge device there is a corresponding interface corresponding to each RPR bridge ring connected to the cross-ring bridge device, for example, when the cross-ring bridge device is simultaneously connected to four RPR bridge rings. At the time, it has an interface corresponding to each RPR bridge ring.
  • a new control packet is added to the protection group, and the protection group information is exchanged between the cross-ring bridge devices in the protection group.
  • the device priority can be compared according to the device information such as the IP address, MAC address, and device ID of the cross-ring bridge device.
  • the device identifier can be configured as required, and the priority of the cross-ring bridge device can be determined by the device identifier. High and low.
  • a control packet sending timer may be configured for each cross-ring bridge device to periodically send and send control messages to the protection group where the device is located.
  • the receiving timer is configured to periodically detect whether a new control message is received.
  • the protection group information of the cross-ring bridge device in the protection group can be updated in time to know the status of other cross-ring bridge devices in the protection group.
  • the cross-ring bridge device may not be able to send control packets normally. Accordingly, other cross-ring bridge devices may not receive the receiving timing period. Control message from the cross-loop bridge device.
  • the control packet receiving timer periodically detects whether a new control packet is received.
  • the cross-ring bridge device can update the node information table in time; if the cross-ring bridge device does not receive the control packet within the timing period, it is checked whether there is a primary cross-loop bridge device with the cross-ring bridge forwarding capability in the protection group, if not, then There is also a need to re-determine the primary cross-loop bridge device with cross-ring bridge forwarding capabilities.
  • the primary cross-ring bridge device Whether the primary cross-ring bridge device fails or not needs to be re-selected can be reflected by the topology discovery of the RPR bridge ring.
  • the primary cross-ring bridge device periodically receives and triggers the topology calculation. After the topology change, the topology fast convergence process is triggered to trigger the topology to quickly converge.
  • each backup spanning bridge device in the protection group also receives and processes the topology packet to perform topology convergence.
  • the active device since the control packet is added in the protection group, the active device also receives the control packet during the timing period of the control packet receiving timer, and triggers the redundancy protection process.
  • a flowchart for triggering redundancy protection of a control packet received by a primary cross-ring bridge device includes the following steps:
  • Step 400 The primary cross-ring bridge device receives the control packet within the control period of the control packet receiving timer, and carries the protection group information of the cross-ring bridge device in the control packet.
  • Step 401 Update the protection group in the node information table according to the protection group information in the control message.
  • the primary cross-ring bridge detects and receives the control message within the timing period of the control message receiving timer, the corresponding node information table is updated.
  • the protection group information does not change, it is not necessary to update the node information table.
  • Step 402 The primary cross-ring bridge device determines whether it has the cross-ring bridge forwarding capability. If the determination result is yes, step 403 is performed; otherwise, step 406 is performed.
  • the primary cross-ring bridge device determines whether it has the cross-ring bridge forwarding capability, and may be the following method, and determine whether there are at least two RPR bridge interfaces in which multiple RPR bridge interfaces can forward the RPR bridge interface. If the judgment result is yes, it has the ability to transmit across the ring. Otherwise, it does not have the ability to transmit across the ring.
  • Step 403 Find the node information table stored by itself, and determine whether there is a cross-loop bridge device with a higher priority than itself in the protection group. If yes, go to step 404; otherwise, go to step 405.
  • each of the cross-ring bridge devices is configured with a corresponding node information table, and because the cross-ring bridge device periodically receives control messages from all other effective cross-ring bridge devices in the protection group, according to the The protection group information carried in the control packet refreshes the node information table stored in the packet, so in this step, by searching for the node information table of the node, the latest protection group information in the protection group to which the cross-ring bridge device belongs can be obtained, and thus The priority information of each cross-bridge device in the protection group information is compared to determine whether there is a cross-ring bridge device with a higher priority than itself in the protection group.
  • Step 404 Determine whether the cross-ring bridge device with higher priority than itself has the capability of cross-ring forwarding. If yes, go to step 406; otherwise, go to step 405.
  • step 406 is performed as long as there is a cross-ring bridge forwarding capability that is higher than its own priority.
  • the method for determining whether the cross-ring bridge device with higher priority than the own has the cross-ring bridge forwarding capability may be as follows: determining whether at least two of the multiple RPR bridge interfaces of the cross-ring bridge device having higher priority than the self have The RPR bridge interface is connected to its corresponding RPR bridge interface on the corresponding RPR bridge ring. If the judgment result is yes, the cross-loop bridge device is provided. Cross-ring bridge forwarding capability; otherwise, the cross-ring bridge device does not have cross-ring bridge forwarding capability.
  • the RPR bridge interface of the cross-ring bridge device with the highest priority is connected to the corresponding RPR bridge interface on the corresponding RPR bridge ring as: Whether the RPR bridge interface of the bridge device exists in its corresponding topology structure table. If the judgment result is yes, the RPR bridge interface of the cross-ring bridge device with higher priority than itself has corresponding to its corresponding RPR bridge interface. The RPR bridge ring is connected to the RPR bridge ring; otherwise, the RPR bridge interface of the cross-ring bridge device with higher priority than its own does not communicate with its corresponding RPR bridge interface on the corresponding RPR bridge ring.
  • Step 405 The primary cross-ring bridge device broadcasts a control packet to the protection group. In this control message, the status of the primary cross-loop bridge device is still in the active state.
  • the purpose of broadcasting the control packet to the protection group is to notify the other members in the protection group of the protection group information of the cross-ring bridge device.
  • This step indicates that the current active cross-ring bridge device is still in good working condition, and there is no cross-ring forwarding capability that has a higher priority than the current active cross-ring bridge device.
  • Step 406 The primary cross-ring bridge device exits the active state and broadcasts a control packet to the protection group. In the control message, the status of the primary cross-ring bridge device is the standby state.
  • a flowchart of the redundancy protection triggered by the standby cross-ring bridge device receiving the control packet includes the following steps:
  • Step 500 The standby cross-ring bridge device receives the control packet in the control period of the control packet receiving timer, and carries the protection group information of the cross-ring bridge device in the control packet.
  • Step 501 Update the protection group in the node information table according to the protection group information in the control message.
  • step 401 The specific method and processing in this step are the same as those in step 401, and will not be described in detail herein.
  • Step 502 The standby cross-ring bridge device determines whether it has the cross-ring bridge forwarding capability. If the determination result is yes, step 503 is performed; otherwise, step 506 is performed.
  • Step 503 Find the node information table stored by itself, and determine whether there is a cross-loop bridge device with a higher priority than itself in the protection group. If yes, execute step 504; otherwise, perform step 505.
  • Step 504 Determine whether the cross-ring bridge device with higher priority than itself has the capability of cross-ring forwarding. If yes, go to step 506; otherwise, go to step 505.
  • the cross-ring bridge device with higher priority than the self in the protection group may have more than one cross-ring bridge device with higher priority than itself because of the network topology change, but as long as there is a higher priority than itself
  • the cross-ring bridge device has cross-ring bridge forwarding capability, and step 506 is performed.
  • the method for determining whether the cross-ring bridge device with higher priority than the own has the cross-ring bridge forwarding capability can adopt the same method as that in step 404, and is not described in detail herein.
  • Step 505 The standby cross-ring bridge device is upgraded to the active state and broadcasts control packets to the protection group. In the control message, the status of the standby cross-ring bridge device is the active state.
  • Step 506 The standby cross-ring bridge device broadcasts a control packet to the protection group. In this control message, the status of the standby cross-ring bridge device is still in the standby state.
  • the purpose of broadcasting the control packet to the protection group is to notify the other members in the protection group of the protection group information of the cross-ring bridge device.
  • This step indicates that in the current protection group, the cross-ring bridge device with higher priority than itself has the ability to transmit across the ring bridge, so it does not have the condition to become the primary cross-ring bridge device.
  • the flow chart of the primary cross-ring bridge device triggered by the topology convergence event in the present invention includes the following steps:
  • Step 600 The primary cross-ring bridge device receives the topology packet, and includes the MAC address of the node, the eastward and westward protection states of the node, and the edge state information in the topology packet.
  • Step 601 Trigger the topology convergence event and refresh its own topology table.
  • the PC structure table includes the MAC address information of each node connected to the node, the MTU (Maximum Transmission Unit) information, the hop count from the point, the edge state of each node, and the protection state. And other information.
  • the primary cross-ring bridge device After receiving the topology message, the primary cross-ring bridge device recalculates the current topology structure and refreshes its topology table after the topology structure converges.
  • Step 602 The primary cross-ring bridge device determines whether it has the cross-ring bridge forwarding capability. If the determination result is yes, step 603 is performed; otherwise, step 606 is performed.
  • the primary cross-ring bridge device judges multiple of its own according to the information in its topology table.
  • the RPR bridge interface can forward packets. If the result is YES, the device has the capability of cross-ring forwarding. Otherwise, there is no cross-ring forwarding capability.
  • Step 603 Find the node information table stored by itself, and determine whether there is a cross-loop bridge device with a higher priority than itself in the protection group. If yes, execute step 604; otherwise, go to step 605.
  • each of the cross-ring bridge devices is configured with a corresponding node information table, and because the cross-ring bridge device periodically receives control messages from all other effective cross-ring bridge devices in the protection group, according to the The protection group information carried in the control packet refreshes its own node information. Therefore, in this step, by searching its own node information table, the latest protection group information in the protection group to which the cross-ring bridge device belongs can be obtained, and thus the comparison can be performed.
  • the priority information of each cross-bridge device in the protection group information is used to determine whether there is a cross-ring bridge device with a higher priority than itself in the protection group.
  • Step 604 Determine whether the cross-ring bridge device with higher priority than itself has the capability of cross-ring forwarding. If yes, go to step 606; otherwise, go to step 605.
  • the cross-ring bridge device with higher priority than the self in the protection group may have multiple cross-ring bridge devices with higher priority than itself because of the network topology change, but as long as there is a higher priority than itself If the cross-ring bridge device has the cross-ring bridge forwarding capability, step 606 is performed.
  • the method for determining whether the cross-ring bridge device with higher priority than the own has the cross-ring bridge forwarding capability may be as follows: determining whether at least two of the multiple RPR bridge interfaces of the cross-ring bridge device having higher priority than the self have The RPR bridge interface is connected to its corresponding RPR bridge interface on the corresponding RPR bridge ring. If the judgment result is yes, the cross-ring bridge device has the cross-ring bridge forwarding capability; otherwise, the cross-ring bridge is described. The device does not have cross-ring bridge forwarding capabilities. In the judging process, the RPR bridge interface of the cross-ring bridge device with higher priority than the self is determined.
  • Whether the corresponding RPR bridge interface is connected to the corresponding RPR bridge ring as follows: Determine whether the RPR bridge interface of the cross-ring bridge device with higher priority than its own exists in its corresponding topology structure table, if the judgment result is yes The RPR bridge interface of the cross-ring bridge device with higher priority than its own is connected to its corresponding RPR bridge interface on the corresponding RPR bridge ring; otherwise, the RPR of the cross-ring bridge device with higher priority than itself The bridge interface does not communicate with its corresponding RPR bridge interface on the corresponding RPR bridge ring.
  • Step 605 The primary cross-ring bridge device broadcasts a control packet to the protection group.
  • the purpose of broadcasting the control packet to the protection group is to notify the other members in the protection group of the protection group information of the cross-ring bridge device.
  • This step indicates that the current active cross-ring bridge device is still in good working condition, and there is no cross-ring forwarding capability that has a higher priority than the current active cross-ring bridge device.
  • Step 606 The primary cross-ring bridge device exits the active state and broadcasts a control packet to the protection group.
  • a flowchart of redundancy protection triggered by a topology convergence event in a standby cross-ring bridge device includes the following steps:
  • Step 700 The standby cross-ring bridge device receives the topology packet.
  • Step 701 Trigger the topology convergence event, and refresh its own topology table.
  • step 601 The specific method and processing in this step are the same as those in step 601, and will not be described in detail herein.
  • Step 702 The standby cross-ring bridge device determines whether it has the cross-ring bridge forwarding capability. If the determination result is yes, step 703 is performed; otherwise, step 706 is performed.
  • Step 703 Search for the node information table stored by itself, and determine whether there is a cross-loop bridge device with a higher priority than itself in the protection group. If yes, go to step 704; otherwise, go to step 705.
  • the determination method in this step is the same as that in step 603, and will not be described in detail herein.
  • Step 704 Determine whether the cross-ring bridge device with higher priority than itself has the capability of cross-ring forwarding. If yes, go to step 706; otherwise, go to step 705.
  • the cross-ring bridge device with higher priority than the self in the protection group may have one due to the network topology change. More than one cross-ring bridge device with higher priority than itself, but if there is a cross-ring bridge device with higher priority than its own, it has step-hopping capability.
  • the method for determining whether the cross-ring bridge device with higher priority than the self-priority has the cross-ring bridge forwarding capability can adopt the same method as that in step 604, and is not described in detail herein.
  • Step 705 The standby cross-ring bridge device is upgraded to the active state and broadcasts control packets to the protection group.
  • Step 706 The standby cross-ring bridge device broadcasts a control packet to the protection group.
  • the purpose of broadcasting the control packet to the protection group is to notify the other members in the protection group of the protection group information of the cross-ring bridge device.
  • This step indicates that in the current protection group, the cross-ring bridge device with higher priority than itself has the ability to transmit across the ring bridge, so it does not have the condition to become the primary cross-ring bridge device.
  • FIG. 8 it is a flowchart of redundancy protection of a cross-ring bridge device after a timer expires in the embodiment of the present invention.
  • Step 801 The control packet receiving timer expires, that is, the cross-loop bridge device does not receive the control packet during the timing period.
  • the reason for the timer timeout may be that the other cross-ring bridge devices in the protection group to which the cross-ring bridge device belongs are invalid, or the interfaces between other cross-ring bridge devices and all RPR bridge rings are faulty.
  • Step 802 The cross-ring bridge device determines whether the current state is the standby state. If the determination result is yes, step 803 is performed; otherwise, step 805 is performed.
  • the cross-ring bridge device determines whether the current state of the device is the standby state by searching for its own node information table, where the node information table includes the current status of the cross-bridge device.
  • Step 803 Determine whether there is a primary cross-loop bridge device with cross-ring forwarding capability in the protection group. If the determination result is yes, go to step 804. Otherwise, go to step 805.
  • the method for determining whether there is a primary cross-ring bridge device with cross-ring forwarding capability in the protection group may be as follows: determining whether at most one RPR interface exists in multiple RPR bridge interfaces of other cross-ring bridge devices in the protection group The corresponding RPR bridge interface is connected to the corresponding RPR bridge ring. If the judgment result is yes, there is no cross-ring forwarding capability in the protection group. The active primary cross-ring bridge forwards the device. Otherwise, there is a primary cross-ring bridge device with cross-ring forwarding capability in the protection group.
  • the RPR bridge interface of the other cross-ring bridge devices in the protection group is connected with the corresponding RPR bridge interface on the corresponding RPR bridge ring as: Whether the RPR bridge interface exists in its own topology table, and if the judgment result is yes, the RPR bridge interface of the other cross-ring bridge device and its corresponding RPR bridge interface are connected on the corresponding RPR bridge ring. Otherwise, the RP bridge interface of the other cross-ring bridge device does not communicate with its corresponding RPR bridge interface on the corresponding RPR bridge ring.
  • Step 804 The cross-ring bridge device is upgraded to the primary cross-ring bridge device, and sends control packets to the protection group.
  • This step indicates that there is no primary cross-ring bridge device with cross-ring forwarding capability in the protection group to which the cross-ring bridge device belongs.
  • the cross-ring bridge device is upgraded as the primary cross-ring bridge device and bears the cross-ring bridge datagram. Forwarding of the text.
  • Step 805 The cross-ring bridge device broadcasts a control packet to the protection group.
  • the purpose of broadcasting the control packet to the protection group in this step is to notify the other members of the protection group of the protection group information of the cross-ring bridge device.
  • the processes shown in FIG. 4 to FIG. 8 constitute a process of the complete cross-ring bridge device redundancy method in the embodiment of the present invention, which can receive the topology message in the cross-ring bridge device in the protection group.
  • Control packet or when the control packet receiving timer expires perform state self-test, and perform primary and backup state switching and control according to the self-test result, ensuring that the current primary spanning bridge device in the protection group is a protection group.
  • the waiting time can be further set in the process described in the foregoing FIG. 4 to FIG. 8.
  • the primary cross-loop bridge device is ready to exit the active state, that is, the process proceeds to steps 404 to 406. Or; when the timer has not timed out, the standby device is ready to upgrade to the primary cross-loop bridge device, that is, to perform between steps 504 and 505.
  • the active cross-ring bridge device and the backup cross-ring bridge device can determine the current step of the cross-ring bridge device with the highest priority in the current protection group and the corresponding step 406, Steps 505, 803; otherwise, perform corresponding steps 405, 506, 804.
  • the primary cross-ring bridge device and the standby cross-ring bridge device can also set the number of waiting control packets, that is, the primary spanning bridge device that is about to exit the primary state, and the standby spanning bridge device that is about to be upgraded to the primary spanning bridge device. Wait for the number of control packets to be set, that is, ensure that the status of the cross-ring bridge device with the highest priority in the current protection group is stable, and then perform the corresponding operations.
  • Each cross-ring bridge device in the protection group can detect whether a new cross-ring bridge device is added to the protection group or the cross-ring bridge device is deleted by receiving the topology.
  • cross-ring bridge devices in a protection group are not aware of changes in the priority of other devices in the protection group. Therefore, the present invention transmits status information of each cross-bridge device in the protection group through the newly added control message.
  • the control packet carries at least the ID of the cross-ring bridge device, the protection group ID, the device priority, the current state of the device, and the RPRMAC information of the current multiple interfaces of the device.
  • the information carried in the control packets is collectively referred to as a protection group. information.
  • each cross-ring bridge device in the protection group since each cross-ring bridge device in the protection group periodically broadcasts control packets to the protection group and periodically receives control packets, the cross-ring bridge device can notify its protection group information in the protection group. Other devices get the latest protection group information for other cross-ring bridge devices in the protection group. Of course, in addition to periodically transmitting the control packet to the protection group, the cross-ring bridge device in the protection group can also trigger the transmission of the control packet to the protection group when the information of the protection device of the cross-ring bridge device changes.
  • the embodiment of the invention further provides a system for redundancy protection of a bridge mode elastic packet ring bridge device, comprising: at least two cross-ring bridge devices spanning at least three resilient packet rings, and the cross-ring bridge devices are composed
  • a protection group in which a cross-ring bridge device in the protection group is a primary cross-ring bridge device, which is responsible for forwarding packets, and the others are standby cross-ring bridge devices. When the protection group changes, the protection group is within the protection group.
  • Another cross-loop bridge device with cross-ring bridge forwarding capability acts as the primary cross-ring bridge device.
  • a schematic block diagram of a cross-loop bridge device in the system embodiment of the present invention includes: a node information table storage unit 91, a topology information storage unit 92, and a control message sending unit.
  • the node information table storage unit 91 is configured to store a node information table that stores information about each cross-ring bridge device protection group in the protection group, where the protection group information includes at least: priority information of the cross-ring bridge device, and a cross-ring bridge device. Current status, protection group ID, and cross-loop bridge device ID information.
  • the node information table storage unit 91 updates the stored node information table, or changes the state of the cross-bridge device itself. After that, the node information table storage unit 91 also needs to update its stored node information table.
  • the topology information storage unit 92 is configured to store the topology structure table. When the cross-loop bridge device receives the topology message and finds that the topology structure changes, the topology information storage unit 92 updates its storage topology table.
  • the control packet sending unit 93 is configured to broadcast a control packet to the protection group, where the control packet carries the protection group information of the cross-loop bridge device itself.
  • the status detecting unit 94 is configured to: when the cross-ring bridge device receives the control message or the topology message, the primary and backup of the cross-loop bridge device according to the information in the node information table and the topology structure table. The status is detected, and it is determined according to the detection result whether the primary and backup state transitions need to be performed. If necessary, the notification state transition unit 95 modifies the current state of the cross-loop bridge device in the protected group information, and receives the state transition unit. After modifying the completed message, the notification control message sending unit 93 broadcasts its current protection group information to the protection group through the control message; if not, directly notifies the control message sending unit 93 to its own current The protection group information is broadcasted to the protection group through a control message.
  • the state transition unit 95 After the state transition unit 95 receives notification state detection unit 94, the current state of the inter-ring bridge device modifying the protective group information, and to return the modified state detection unit 94 after completion of modification complete message 0
  • the cross-ring bridge device may further include: a control message transmission timer 901 and a control message reception timer 902.
  • the control packet sending timer 901 is configured to set a timing for controlling the sending of the packet, and after the timing time arrives, the notification control packet sending unit 93 broadcasts a control packet to the protection group;
  • the receiving timer 902 is configured to set an aging time for receiving the control packet, and after the aging time arrives, the notification state detecting unit 94 detects the primary and backup states of the cross-loop bridge device.
  • the state detecting unit 94 detects whether the cross-ring bridge device has the cross-ring bridge forwarding capability, and the priority in the protection group, and according to the detection.
  • the result and the information in the topology table determine whether the cross needs to be modified
  • a specific process for determining whether the current state of the cross-ring bridge device needs to be modified may be referred to the description in the foregoing method embodiment of the present invention.
  • the state detecting unit 94 notifies the state transition unit 95 that the state transition unit 95 updates the current state of the cross-loop bridge device in the protection group information, such as changing from the primary state to the standby state, or from the standby state. Main state.
  • the state transition unit 95 modifies the current state of the cross-bridge device in the protection group information according to the notification, and returns a modification completion message to the state detecting unit 94 after the modification is completed.
  • the status detecting unit 94 notifies the control message transmitting unit 93 to broadcast its own current protection group information to the protection group through the control message. If not required, the state detecting unit 94 directly informs the control message transmitting unit 93 to broadcast its own current protection group information to the protection group through the control message.
  • the mode of operation of the state detecting unit 94 and the state converting unit 95 in the system embodiment of the present invention is not limited to the above-described case, and other cooperation modes may be used.
  • the state detecting unit 94 calls the state converting unit 95. The way to modify the information in the protection group.
  • the state detecting unit 94 detects whether the protection group information has changed, and if no change occurs, according to The information in the node information table further detects whether there is a primary cross-loop bridge device with cross-ring forwarding capability in the protection group. If not, the primary and backup states of the cross-ring bridge device need to be re-determined.
  • the specific process refer to the description in the foregoing method embodiment of the present invention.
  • the state transition unit 95 modifies the current state of the cross-loop bridge device in the protection group information, and then the state detecting unit 94 notifies the control message transmitting unit 93 to pass its current protection group information through the control report. The text is broadcasted to the protection group. If the state does not need to be changed, the state detecting unit 94 directly informs the control message transmitting unit 93 to broadcast its own current protection group information to the protection group through the control message.
  • the control packet sending unit 93 broadcasts a control packet to the protection group, the control The packet carries the protection group information of the primary cross-ring bridge device; if the cross-ring bridge device is the standby cross-ring bridge device, the state detecting unit 94 according to the node information table and the structure The information in the table determines whether there is a primary cross-ring bridge device with cross-ring forwarding capability in the protection group. If not, the standby cross-ring bridge device needs to be upgraded to the primary cross-ring bridge device to notify the state transition.
  • the unit 95 updates its protection group information, and also informs the control message sending unit 93 to broadcast a control message to the protection group.
  • the control message carries the updated protection group information of the cross-loop bridge device.
  • the bridge mode elastic packet ring bridge device redundancy protection system comprises at least three cross-ring bridge devices corresponding to the intersection points of the elastic packet ring to form a protection group, and one of the protection groups is set.
  • the cross-ring bridge device is the primary cross-ring bridge device, which is responsible for forwarding packets, and the others are standby cross-ring bridge devices.
  • the node information table storage unit, the state detecting unit, and the control message sending unit are disposed in each cross-ring bridge device, so that the cross-ring bridge device can trigger the redundancy protection process not only according to the received topology message, but also The redundancy protection process can be triggered according to the received control message. Therefore, after the RPR bridge changes, the RPR bridge ring can be quickly recovered, so that the protection capability for the service meets the requirements of the carrier level.
  • the cross-ring bridge device can update the node information table in time; if the cross-ring bridge device does not receive the control packet within the timing period, it is checked whether there is a cross-ring bridge forwarding in the protection group.
  • the primary cross-ring bridge device of the capability if not, also needs to re-determine the primary cross-ring bridge device with the cross-ring bridge forwarding capability, thereby further ensuring rapid recovery after the RPR bridge ring changes.

Abstract

Procédé et système de protection redondante de dispositifs passerelles entre anneaux, sur anneau souple à commutation par paquet en mode passerelle. Le procédé est le suivant: formation d'un groupe de protection par au moins deux dispositifs passerelles pour anneau, ce type de dispositif assurant la connexion entre au moins trois anneaux souples à commutation par paquet; on désigne un de ces dispositifs du groupe de protection comme dispositif passerelle principal entre anneaux, pour répondre aux fins de transmission de messages, et les autres dispositifs sont désignés comme dispositifs passerelles de réserve entre anneaux; lorsque le groupe de protection est modifié, on détermine un autre dispositif de ce type comme dispositif disponible pour la transmission de messages sur la passerelle, en tant que dispositif passerelle principal entre anneaux.
PCT/CN2007/000618 2006-08-29 2007-02-27 Procédé et système de protection redondante de dispositifs passerelles entre anneaux, sur anneau souple à commutation par paquet en mode passerelle WO2008028377A1 (fr)

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CN200610037348.3 2006-08-29

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CN101262400A (zh) * 2007-03-09 2008-09-10 华为技术有限公司 一种桥模式弹性分组环冗余保护的方法和系统
CN102148733B (zh) * 2010-02-04 2014-01-01 华为技术有限公司 一种相交环网保护方法、装置和系统
CN104135418B (zh) * 2013-05-03 2017-09-15 中国移动通信集团内蒙古有限公司 一种实现二层与三层虚拟专用网协调倒换的方法及装置
CN104993903B (zh) * 2015-06-26 2018-02-02 东南大学 一种多级波分复用环形光网络
CN106850715A (zh) * 2015-12-04 2017-06-13 大唐移动通信设备有限公司 一种基于主机状态和优先级的主用主机动态选择方法
CN110752955A (zh) * 2019-10-30 2020-02-04 北京计算机技术及应用研究所 一种席位不变故障迁移系统和方法

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