CN101729348B - Method and system for protecting point to multi-point ring - Google Patents
Method and system for protecting point to multi-point ring Download PDFInfo
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- CN101729348B CN101729348B CN2009100858399A CN200910085839A CN101729348B CN 101729348 B CN101729348 B CN 101729348B CN 2009100858399 A CN2009100858399 A CN 2009100858399A CN 200910085839 A CN200910085839 A CN 200910085839A CN 101729348 B CN101729348 B CN 101729348B
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Abstract
The invention discloses a method for protecting a point to multi-point ring, which comprises the following steps that: a root node of the point to multi-point (P2MP) ring sends an operation, administration, management (OAM) connectivity detection message along a work path and a backup path respectively; when a leaf node which is furthest away from the root node in the work path does not receive the OAM connectivity detection message in the work path within the preset rule, the furthest leaf node sends a fault message to the root node along a configured return path; the root node activates the backup path according to the received fault message, and transmits the traffic flow through the work path and the backup path; the leaf node on the P2MP ring receives the traffic flow from the work path or the backup path according to a preset local policy. The invention also discloses a system for protecting the point to multi-point ring, which can reduce the number of the backup path on the P2MP ring, simplify the configuring operation of the backup path, and save the bandwidth resources.
Description
Technical field
The present invention relates to the ring protection technology in the network service, relate in particular to a kind of guard method and system of point to multi-point ring.
Background technology
Under the promotion of telecommunication service IPization trend; transmit net loaded business from time division multiplexing (TDM; Time Division Multiplexing) be main with IP to being main the transformation; this just need a kind ofly can effectively transmit Packet Service; and the packet transport technologies that carrier class operation management maintain (OAM, Operations Administration andMaintain) is provided and protects.Under this demand, industry has proposed Packet Transport Network (PTN, Packet Transport Network) notion, multiprotocol label switching transport frame (MPLS-TP, Transport Profile for Multi-Protocol Label Switching) is exactly the technology of a kind of PTN.
At the Internet engineering duty group (IETF, Internet Engineering Task Force) emphasize in Ding Yi the MPLS-TP demand (MPLS-TP requirements): the structure of MPLS-TP must allow traditional transmission net to be smoothly transitted into PTN, and support the packet-based service of growth fast, as IP phone (VoIP, Voice over Internet Protocol), VPN (virtual private network) (VPN, Virtual PrivateNetwork), IPTV (IPTV) etc.
At present, the application of putting multiple spot (P2MP, Point To Multipoint) is subjected to attention more and more widely, and most of traditional transmission net all is based on ring-network topology, and therefore, the protection of research P2MP looped network is significant.In existing MPLS-TP; protection scheme to the P2MP ring comprises based on quick heavy-route (FRR; Fast ReRoute) two kinds of schemes: quick heavy-route transport frame (FRR-TP; Fast Rerouting-Transport Profile) and the optimum quick heavy-route (ROM-FRR, RingOptimized Multicast Fast Rerouting) of ring.
With P2MP ring topology shown in Figure 1 is example, and operating path is: A → [B] → C → [D] → E → [F], and wherein node A is a root node, and the corresponding node of [] expression is a leaf node, and so-called leaf node promptly is meant the node of the service traffics that receive the root node transmission.In FRR-TP, if protection whole piece operating path just need all dispose a backup path for every link or each node (not comprising root node) that needs protection on this operating path, and this backup path is a point-to-point.The backup path configuration of P2MP ring shown in Figure 1 is as shown in table 1:
| Link X-Y fault | Backup path | The nodes X fault | Backup path |
| A-B | A→F→E→D→C→B | B | A→F→E→D→C |
| B-C | B→A→F→E→D→C | C | B→A→F→E→D |
| C-D | C→B→A→F→E→D | D | C→B→A→F→E |
| D-E | D→C→B→A→F→E | E | D→C→B→A→F |
| E-F | E→D→C→B→A→F | F | E→D→C→B→A |
Table 1
As can be seen, in the protection scheme of FRR-TP, when the P2MP ring that N node arranged is implemented protection, need the backup path of configuration 2 (N-1) bar point-to-point; In addition, the node adjacent with fault can detect link or node failure, link switchover is carried out at the node adjacent with fault, for example: in P2MP ring shown in Figure 2, solid line is represented operating path, and dotted line is represented backup path, when link B-C breaks down, link switchover is carried out in Node B and node C, promptly is switched to backup path B → A → F → E → D → C of link B-C; The service traffics that are transferred to leaf node D and F are switched to backup path from operating path and transmit through Node B the time, after service traffics are transferred to node C along backup path, service traffics are switched to operating path from backup path again and transmit, and service traffics could continue to arrive leaf node D and F along operating path like this.This shows that in this protection scheme, the waste of bandwidth is very serious, and the jumping figure of the path process of leaf node D and F neither be optimum.
ROM-FRR improves FRR-TP, and the configuration of its backup path is as shown in table 2:
| The link/node fault | Backup path |
| Link?A-B/node?B | A→[F]→E→[D]→C→[B] |
| Link?B-C/node?C | B→A→[F]→E→[D]→C |
| Link?C-D/node?D | C→B→A→[F]→E→[D] |
| Link?D-E/node?E | D→C→B→A→[F]→E |
| Link?E-F/node?F | E→D→C→B→A→[F] |
Table 2
As can be seen, the P2MP ring for same in the protection scheme of ROM-FRR, only needs N-1 bar backup path, and these backup paths may be point-to-points, also may be that point arrives multiple spot.
For example: in P2MP ring shown in Figure 3, solid line is represented operating path, and dotted line is represented backup path, and for link B-C, its backup path is B → A → [F] → E → [D] → C; When link B-C breaks down, link switchover is carried out in Node B, being switched to backup path from operating path during service traffics process Node B transmits, when service traffics arrived leaf node F along backup path, leaf node F received service traffics and service traffics is continued transmission along backup path; Subsequently, service traffics arrive leaf node D along backup path, and leaf node D receives service traffics.
This shows; the protection scheme of ROM-FRR has improved the operating position of bandwidth to a certain extent; but; ROM-FRR is the same with FRR-TP; all dispose the backup path of a special use at every link and each node on the protected path, a lot of if ring is gone up node, the backup path quantity that needs so to dispose also is sizable; not only configuration operation is loaded down with trivial details, also is unfavorable for saving bandwidth resources.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of guard method and system of point to multi-point ring, to reduce the backup path quantity of P2MP ring, simplifies the configuration operation of backup path, saves bandwidth resources.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of guard method of point to multi-point ring, this method comprises:
Point arrives the root node of multiple spot P2MP ring respectively along operating path and backup path transmit operation management maintenance OAM connectivity testing message, and the transmission direction of described backup path is opposite with the transmission direction of described operating path;
When not receiving OAM connectivity testing message on the operating path apart from root node leaf node farthest in default rule on the operating path, described leaf node farthest sends failure message along the return path of configuration to described root node;
Described root node activates backup path according to the described failure message that receives, and service traffics are transmitted by described operating path and backup path;
Leaf node on the described P2MP ring receives described service traffics according to preset local policy from operating path or backup path.
Described default rule comprises: preset time, thresholding number of times.
Before root node sent the OAM connectivity testing message, this method further comprised: configuration and the corresponding backup path of described operating path, and the return path of configuration from described leaf node farthest to root node.
Described backup path arrives the path of multiple spot for point.
Described return path is the path of point-to-point.
Leaf node on the described P2MP ring receives service traffics according to preset local policy from operating path or backup path, is specially:
Leaf node for receive the OAM connectivity testing message on the described P2MP ring in preset time or thresholding number of times receives service traffics from operating path; Leaf node for do not receive the OAM connectivity testing message on the described P2MP ring in preset time or thresholding number of times receives service traffics from backup path.
The present invention also provides a kind of protection system of point to multi-point ring, and this system comprises:
Root node is used for sending the OAM connectivity testing message along operating path and backup path respectively, and when receiving failure message, activates backup path, and service traffics are transmitted by described operating path and backup path; The transmission direction of described backup path is opposite with the transmission direction of described operating path;
Leaf node is used to receive the OAM connectivity testing message of described root node, and according to preset local policy, receives service traffics from operating path or backup path; And when described leaf node on operating path apart from root node farthest the time, when also being used in preset rules, not receiving the OAM connectivity testing message on the operating path, send failure message to described root node along the return path of configuration.
Described default rule comprises: preset time, thresholding number of times.
Described return path is apart from the point-to-point path of root node leaf node farthest to root node on the operating path.
Described leaf node is further used for, if receive the OAM connectivity testing message in preset time or thresholding number of times, then receives service traffics on operating path; If in preset time or thresholding number of times, do not receive the OAM connectivity testing message, then on backup path, receive service traffics.
The guard method of a kind of point to multi-point ring provided by the present invention and system, the root node that is encircled by P2MP sends the OAM connectivity testing message along operating path and backup path respectively; When not receiving OAM connectivity testing message on the operating path apart from root node leaf node farthest in preset time or thresholding number of times on the operating path, leaf node farthest sends failure message along the return path of configuration to root node; Root node activates backup path according to the failure message that receives, and service traffics are transmitted by operating path and backup path; Leaf node on the P2MP ring receives service traffics according to preset local policy from operating path or backup path.
Save bandwidth resources by the present invention, reduced the number of backup path, simplified the configuration operation of backup path; In addition, service traffics are transmitted on work and backup path simultaneously, can guarantee that leaf node receives service traffics from suitable path.
Description of drawings
Fig. 1 is the topological structure schematic diagram of P2MP ring in the prior art;
Fig. 2 switches schematic diagram for the backup path under the FRR-TP protection scheme in the prior art;
Fig. 3 switches schematic diagram for the backup path under the ROM-FRR protection scheme in the prior art;
Fig. 4 is the flow chart of the guard method of a kind of point to multi-point ring of the present invention;
Fig. 5 is the composition structural representation of the protection system of a kind of point to multi-point ring of the present invention.
Embodiment
The technical solution of the present invention is further elaborated below in conjunction with the drawings and specific embodiments.
Defective for FRR-TP in the solution prior art and the existence of ROM-FRR protection scheme; the guard method of a kind of point to multi-point ring provided by the invention; be a corresponding backup path of operating path configuration of a P2MP ring, and the transmission direction of backup path is opposite with the transmission direction of operating path.By this backup path, can be on operating path any link or any one node (except root node) when breaking down, the transmission of service traffics is played a protective role, guarantee of the normal reception of each leaf node to service traffics.
The guard method of P2MP ring of the present invention as shown in Figure 4, mainly may further comprise the steps:
The present invention needs the pre-configured and corresponding backup path of operating path, and only corresponding backup path of operating path, the transmission direction of this backup path is opposite with the transmission direction of operating path, and for example: configuration is A → [F] → E → [D] → C → [B] with operating path A → [B] → C → [D] → E → [F] corresponding backup path.
By the OAM detection of connectivity mechanism of MPLS-TP, the present invention periodically sends the OAM connectivity testing message along operating path and pre-configured backup path respectively by root node, in order to detect link failure and node failure.
Default rule can be configured according to actual needs, for example can comprise: preset time, thresholding number of times etc.Rule default among the present invention is not limited only to above-mentioned the act, can also expand according to actual needs.
It is pointed out that before step 401, the present invention also need pre-configured from the operating path apart from the return path of root node leaf node farthest to root node, and this return path is the path of point-to-point.Preset time can be set according to actual needs flexibly among the present invention, when not receiving OAM connectivity testing message on the operating path within the predetermined time apart from root node leaf node farthest on the operating path, promptly judge on the operating path and break down, thereby need send failure message to root node.
In addition, because the OAM connectivity testing message is periodically to send, therefore, also can be among the present invention according to the transmission cycle and the scheduled time of OAM connectivity testing message, determine the number of times of thresholding, for example: the number of times of determining thresholding is 3, if on the operating path apart from the continuous OAM connectivity testing message that does not receive on the operating path for 3 times of root node leaf node farthest, promptly judge on the operating path and break down, thereby need send failure message to root node.
After root node receives failure message, know on the operating path and break down, and then the activation backup path, and the service traffics that will need to transmit can both receive service traffics respectively along operating path and backup path transmission to guarantee each leaf node on the P2MP ring.
Local policy can be configured according to actual needs, and for example, a kind of local policy is: the leaf node for receive the OAM connectivity testing message on the P2MP ring in preset time or thresholding number of times receives service traffics from operating path; Leaf node for do not receive the OAM connectivity testing message on the P2MP ring in preset time or thresholding number of times receives service traffics from backup path.By this local policy, can guarantee that each leaf node on the P2MP ring can both receive service traffics, or receive, or receive from backup path from operating path.
Be described in detail below in conjunction with the guard method of specific embodiment above-mentioned P2MP ring.Be example with P2MP ring topology shown in Figure 1 still, node A is a root node, and operating path is A → [B] → C → [D] → E → [F], and corresponding backup path is A → [F] → E → [D] → C → [B].Service traffics are at first transmitted along operating path A → [B] → C → [D] → E → [F], and, periodically send the OAM connectivity testing message along operating path and backup path by root node all moving the OAM detection of connectivity mechanism of MPLS-TP on the operating path and on the backup path; When link B-C broke down, leaf node F did not receive the OAM connectivity testing message on the operating path in preset time or thresholding number of times, promptly thought and broke down on operating path, thereby send failure message by return path to root node A; After root node A receives failure message, activate backup path, start protection and switch, and service traffics are transmitted by operating path and backup path; According to preset local policy, leaf node B receives service traffics from operating path, and leaf node F and leaf node D receive service traffics from backup path.
Same, when node C breaks down, leaf node F does not receive the OAM connectivity testing message on the operating path in preset time or thresholding number of times, promptly think and break down on operating path, thereby send failure message by return path to root node A; After root node A receives failure message, activate backup path, start protection and switch, and service traffics are transmitted by operating path and backup path; According to preset local policy, leaf node B receives service traffics from operating path, and leaf node F and leaf node D receive service traffics from backup path.
For realizing the guard method of above-mentioned P2MP ring, the present invention also provides a kind of protection system of P2MP ring, and as shown in Figure 5, this system comprises: root node 10 and leaf node 20.Wherein, root node 10 is used for sending the OAM connectivity testing message along operating path and backup path respectively, and when receiving failure message, activates backup path, and service traffics are transmitted by operating path and backup path.Leaf node 20 is used to receive the OAM connectivity testing message of root node 10, and according to preset local policy, receives service traffics from operating path or backup path; And when leaf node on operating path apart from root node farthest the time, when also being used in preset rules, not receiving the OAM connectivity testing message on the operating path, send failure messages to root node 10 along the return path of configuration.Default rule comprises: preset time, thresholding number of times etc.
The transmission direction that it is pointed out that backup path among the present invention is opposite with the transmission direction of operating path, and return path is apart from the point-to-point path of root node leaf node farthest to root node on the operating path.In addition, leaf node 20 is further used for, and according to preset local policy, if receive the OAM connectivity testing message in preset time or thresholding number of times, then receives service traffics on operating path; If in preset time or thresholding number of times, do not receive the OAM connectivity testing message, then on backup path, receive service traffics.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1. the guard method of a point to multi-point ring is characterized in that, this method comprises:
Point arrives the root node of multiple spot P2MP ring respectively along operating path and backup path transmit operation management maintenance OAM connectivity testing message, and the transmission direction of described backup path is opposite with the transmission direction of described operating path;
When not receiving OAM connectivity testing message on the operating path apart from root node leaf node farthest in default rule on the operating path, described leaf node farthest sends failure message along the return path of configuration to described root node;
Described root node activates backup path according to the described failure message that receives, and service traffics are transmitted by described operating path and backup path;
Leaf node on the described P2MP ring receives described service traffics according to preset local policy from operating path or backup path.
2. according to the guard method of the described point to multi-point ring of claim 1, it is characterized in that described default rule comprises: preset time, thresholding number of times.
3. according to the guard method of the described point to multi-point ring of claim 2; it is characterized in that; before root node sends the OAM connectivity testing message; this method further comprises: configuration and the corresponding backup path of described operating path, and the return path of configuration from described leaf node farthest to root node.
4. according to the guard method of the described point to multi-point ring of claim 3, it is characterized in that described backup path arrives the path of multiple spot for point.
5. according to the guard method of the described point to multi-point ring of claim 3, it is characterized in that described return path is the path of point-to-point.
6. according to the guard method of each described point to multi-point ring in the claim 1 to 5, it is characterized in that the leaf node on the described P2MP ring receives service traffics according to preset local policy from operating path or backup path, is specially:
Leaf node for receive the OAM connectivity testing message on the described P2MP ring in preset time or thresholding number of times receives service traffics from operating path; Leaf node for do not receive the OAM connectivity testing message on the described P2MP ring in preset time or thresholding number of times receives service traffics from backup path.
7. the protection system of a point to multi-point ring is characterized in that, this system comprises:
Root node is used for sending the OAM connectivity testing message along operating path and backup path respectively, and when receiving failure message, activates backup path, and service traffics are transmitted by described operating path and backup path; The transmission direction of described backup path is opposite with the transmission direction of described operating path;
Leaf node is used to receive the OAM connectivity testing message of described root node, and according to preset local policy, receives service traffics from operating path or backup path; And when described leaf node on operating path apart from root node farthest the time, when also being used in preset rules, not receiving the OAM connectivity testing message on the operating path, send failure message to described root node along the return path of configuration.
8. according to the protection system of the described point to multi-point ring of claim 7, it is characterized in that described default rule comprises: preset time, thresholding number of times.
9. the protection system of described point to multi-point ring according to Claim 8 is characterized in that described return path is apart from the point-to-point path of root node leaf node farthest to root node on the operating path.
10. according to the protection system of each described point to multi-point ring in the claim 7 to 9, it is characterized in that, described leaf node is further used for, if receive the OAM connectivity testing message in preset time or thresholding number of times, then receives service traffics on operating path; If in preset time or thresholding number of times, do not receive the OAM connectivity testing message, then on backup path, receive service traffics.
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| CN102571534B (en) * | 2010-12-21 | 2015-06-03 | 中兴通讯股份有限公司 | Service transmission method based on ring network protection and node used for service transmission |
| CN102651702A (en) * | 2012-05-09 | 2012-08-29 | 华为技术有限公司 | Ethernet performance measurement method and equipment |
| CN103618763A (en) * | 2013-11-11 | 2014-03-05 | 广东电网公司电网规划研究中心 | System and method for synchronization of communication network and time in intelligent transformer substation |
| CN106302165A (en) * | 2015-05-22 | 2017-01-04 | 中兴通讯股份有限公司 | The guard method of a kind of point-to-multi-point tunnel and device |
| CN110557330B (en) * | 2018-05-30 | 2022-03-25 | 中兴通讯股份有限公司 | Backup path calculation method and device and computer storage medium |
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| CN1889547A (en) * | 2006-08-03 | 2007-01-03 | 华为技术有限公司 | Base band unit ring cascade resource back-up method and base band unit |
| CN101145981A (en) * | 2006-09-13 | 2008-03-19 | 中兴通讯股份有限公司 | Loop detection and switching method of multi-loop Ethernet |
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| CN1889547A (en) * | 2006-08-03 | 2007-01-03 | 华为技术有限公司 | Base band unit ring cascade resource back-up method and base band unit |
| CN101145981A (en) * | 2006-09-13 | 2008-03-19 | 中兴通讯股份有限公司 | Loop detection and switching method of multi-loop Ethernet |
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