CN103516534A - Method for realizing dual-homing protection switching, and home node - Google Patents
Method for realizing dual-homing protection switching, and home node Download PDFInfo
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Abstract
The invention provides a method for realizing dual-homing protection switching, and a home node. The home node comprises a configuration module, a quick alarming detection module, a quick switching decision module and a quick switching execution module. The home node also comprises a rapid node communication module which is used for receiving current node alarming state information that has changed and is sent by the quick alarming detection module, sending the information to an opposite end home node via a node communication channel, receiving opposite end node alarming state information that has changed and is sent by the opposite end home node via the node communication channel, and sending the changed opposite end node alarming state information to the quick switching decision module. The quick switching decision module is used for generating a switching decision based on the changed opposite end node alarming state information that has been received and sending the switching decision to the quick switching execution module. The quick switching execution module is used for performing switching based on the received switching decision. Alarming state information among nodes can be notified through communication channels among the nodes, and the dual-homing protection switching performance is improved.
Description
Technical field
The present invention relates to bearer network field, relate in particular to a kind of method and home node of realizing double-returning protection switching.
Background technology
Complete protected mode is characteristic and the advantage of bearer network equipment.Dual-homing protection is a kind of important kind of bearer network equipment protection mode, is the function combination of network protection and access link protection.Dual-homing protection scenario definition in bearer network is that bearer network network and access network are interconnected by binode, realizes the end-to-end protection of business.
Demand and the specification requirement details of dual-homing protection in bearer network equipment standard " requirement of Packet Transport Network (PTN) general technical " and " requirement of PTN equipment and technology ", have all been mentioned.
While all requiring service access link failure in these two standards, can not cause that bearer network network internal protection switches.Also require to have between interconnected binode simultaneously and notice and the coordination system, while guaranteeing that host node lost efficacy, business is via forwarding from node.
In working group's manuscript " Inter-Chassis Communication Protocol for L2VPN PE Redundancy " of Internet Engineering task groups (IETF), defined a set of communication protocol across frame (ICCP) for state synchronized and the data configuration of each terminal equipment (PE) in realizing dual-homing protection scene redundancy group (RG), this cover agreement can be used in access link side also can be for pseudo-line (PW) side.
At present, in each standard, for major part protection type, all mentioned the index request that is less than 50ms under specified requirements.
The index request proposing for linear protection is: " in the situation that lag time (Hold-off) timer is 0, from occur single point signals lost efficacy (SF) cause service disconnection to business be protected and time of again recovering be no more than 50ms ".
The index request proposing for looped network (Wrapping) protection is: " for one, by being no more than, 16 nodes form, fiber lengths amounts to the ring that is no more than 1200km between node; in the situation that hold-off timer is 0; from occur single point signals lost efficacy (SF) cause service disconnection to be protected and time of again recovering is no more than 50ms to business, the upper protected business number of switching time and ring is irrelevant.”
But for double-returning protection switching be: " protection switch time of dual-homing protection requires to be studied.”
After breaking down, the switching time of linear protection and looped network protection, the protection switch time of dual-homing protection depend on failure detection time, agreement computing time and business switching time.And the protection switch time of dual-homing protection is also subject to the impact of the state advertisement time between dual homed node.
Use ICCP to carry out the state advertisement between node, because ICCP utilizes tag distribution protocol (LDP) expansion, realize, be subject to the restriction of software transmission processing LDP agreement, cannot guarantee the time.
Summary of the invention
The embodiment of the present invention provides a kind of method and home node of realizing double-returning protection switching, cannot guarantee the defect of switching time to overcome existing reverse method.
The embodiment of the present invention provides a kind of home node, comprises configuration module, quick alarm detection module, switches decision-making module and switch Executive Module, and described home node also comprises:
Quick inter-node communication module, for receiving the present node alarm status information after the variation that described quick alarm detection module sends, sends the present node alarm status information after described variation by inter-node communication passage to opposite end home node; And, receive the peer node alarm status information after the variation that described opposite end home node sends by described inter-node communication passage, to switching fast decision-making module, send the peer node alarm status information after described variation;
The described decision-making module of switching fast, for receiving the peer node alarm status information after the described variation that described quick inter-node communication module sends, according to peer node warning information after described variation, generate and switch decision-making, and switch decision-making to switching fast Executive Module described in sending;
The described Executive Module of switching fast, for receive described switch fast that decision-making module sends described in switch decision-making, according to described, switch decision-making and carry out and switch.
Preferably, described quick inter-node communication module, specifically for send the message of the present node alarm status information after described variation of carrying to described opposite end home node by described inter-node communication passage, and, receive the message that carries the peer node alarm status information after described variation that described opposite end home node sends by described inter-node communication passage, described message comprises that transmitting multi protocol label exchanges (MPLS-TP) parallel (PW) operation management (OAM) message.
Preferably, the field that comprises the PW state information, link aggregation (LAG) port status information and multiplex section protection (MSP) the protocol status information that represent corresponding home node in described MPLS-TP PW OAM message.
Preferably, described quick inter-node communication module, describedly switch fast decision-making module, switch Executive Module and described inter-node communication passage fast and all adopt hardware to realize.
Preferably, described home node is applied in dual-homing protection networking.
The embodiment of the present invention also provides a kind of method that realizes double-returning protection switching, and the method comprises:
Peer node alarm status information after the variation that current home node sends by hardware communications passage reception opposite end home node;
Described current home node is according to described peer node alarm status Information generation switching strategy, and carries out and switch according to this switching strategy.
Preferably, described method also comprises: described current home node detects present node alarm status information, and after described present node alarm status information being detected and changing, by described hardware communications passage, to described opposite end home node, send the present node alarm status information after changing.
Preferably, peer node alarm status information after described variation or the present node alarm status information after described variation are carried in message, and described message comprises that transmitting multi protocol label exchanges (MPLS-TP) parallel (PW) operation management (OAM) message.
Preferably, the field that comprises the PW state information, link aggregation (LAG) port status information and the MSP protocol status information that represent corresponding home node in described MPLS-TP PW OAM message.
Preferably, described method is applied in double-returning protection switching scene.
Above-mentioned method and the home node of realizing double-returning protection switching, the alarm status information of using internodal communication port to complete between dual homed node is noticed fast, thereby has effectively improved double-returning protection switching performance.
Accompanying drawing explanation
Fig. 1 is bearer network equipment typical case dual-homing protection networking schematic diagram of the present invention;
Fig. 2 is the present invention's service path schematic diagram in dual-homing protection networking while accessing side fault;
Service path schematic diagram in dual-homing protection networking when Fig. 3 is network side fault of the present invention;
Fig. 4 is the structural representation of home node embodiment of the present invention;
Fig. 5 is that home node of the present invention is realized quick double-returning protection switching cross-node collaboration process figure;
Fig. 6 is the existing message format schematic diagram of realizing the ICC head of state advertisement between dual-homed node;
Fig. 7 is the heading form schematic diagram that the present invention realizes the MPLS-TP PW OAM message of one of fast state notice mode between dual-homed node;
Fig. 8 is the message content form schematic diagram that the present invention realizes the MPLS-TP PW OAM message of one of fast state notice mode between dual-homed node.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the embodiment in the application and the feature in embodiment be combination in any mutually.
As shown in Figure 1; it is the structural representation of home node embodiment of the present invention; this home node can be realized double-returning protection switching function; this home node comprises configuration module 11, quick alarm detection module 12, switches decision-making module 13, switches Executive Module 14, switches fast decision-making module 15, switches fast Executive Module 16 and quick inter-node communication module 17, wherein:
Configuration module, switches decision-making module for the configuration information relevant with dual-homing protection of receiving is configured to, switches decision-making module fast, switches Executive Module and quick inter-node communication module fast;
Quick alarm detection module, for present node alarm status information is detected, and after described present node alarm status information being detected and changing, by express passway, the present node alarm status information after changing is delivered to quick inter-node communication module; This quick alarm detection module also can pass to the relevant alarm status information of protection to switch fast decision-making module and switch decision-making module;
Switch decision-making module, for switching the result of decision, be synchronized to and switch fast decision-making module; And, will switch the result of decision and be delivered to and switch Executive Module;
Quick inter-node communication module, for receiving the present node alarm status information after the variation that described quick alarm detection module sends, sends the present node alarm status information after described variation by inter-node communication passage to opposite end home node; And, receive the peer node alarm status information after the variation that described opposite end home node sends by described inter-node communication passage, to switching fast decision-making module, send the peer node alarm status information after described variation;
The described decision-making module of switching fast, for receiving the peer node alarm status information after the described variation that described quick inter-node communication module sends, according to peer node warning information after described variation, generate and switch decision-making, and switch decision-making to switching fast Executive Module described in sending;
The described Executive Module of switching fast, for receive described switch fast that decision-making module sends described in switch decision-making, according to described, switch decision-making and carry out and switch.
Above-mentioned quick inter-node communication module is newly-increased module in order to promote double-returning protection switching performance, and above-mentioned to switch fast decision-making module and switch fast Executive Module be the intrinsic module of home node, but function increases with existing comparing to some extent.
Above-mentioned quick inter-node communication module, switch decision-making module fast, switch Executive Module fast, fast alarm detection module and inter-node communication passage all adopt hardware to realize.
Present node alarm status information after peer node alarm status information after above-mentioned variation or variation is carried in message, and this message includes but not limited to transmit multi protocol label exchange (MPLS-TP) parallel (PW) operation management (OAM) message; The field that comprises the PW state information, link aggregation (LAG) port status information and multiplex section protection (MSP) the protocol status information that represent corresponding home node in this MPLS-TP PW OAM message.
Above-mentioned home node can be applicable in the dual-homing protection networking shown in Fig. 2, and network equipment is connected by 2 nodes with access side device, and business both may home-to-home node 1, also possibility home-to-home node 2.Under normal circumstances, business is through home node 1.On home node, network side configuration is across the pseudo-line of subrack (MC-PW) protection, and access side configures across subrack multiplex section (MC-APS) protection or protects across subrack link aggregation (MC-LAG).
Above-mentioned home node can effectively be realized double-returning protection switching, as shown in Figure 3, home node 1 detect and access side device between link occurs fault, notice to home node 2, business arrives home node 2 via home node 1 and arrives access side device again; Similarly, as shown in Figure 4, home node 1 detect with network equipment between be connected and break down, notice to home node 2, business arrives home nodes 1 via home node 2 and arrives and access measurement equipment.
From above specific embodiments, can find out; by introducing quick inter-node communication module and inter-node communication passage; in conjunction with intrinsic the switching fast decision-making module, switch Executive Module, the quick snap information transmission channels between alarm detection module and module fast in home node inside; can promote bearer network equipment double-returning protection switching performance, reach carrier class business and switch index request under dual-homing protection networking.
Based on above-mentioned home node, the embodiment of the present invention also provides a kind of method that realizes double-returning protection switching, and the method comprises:
Peer node alarm status information after the variation that step 1, current home node send by hardware communications passage reception opposite end home node;
In addition, the method can also comprise: current home node detects present node alarm status information, and after described present node alarm status information being detected and changing, by described hardware communications passage, to described opposite end home node, send the present node alarm status information after changing.
As shown in Figure 5; that home node is realized quick double-returning protection switching cross-node collaboration process figure; by the decision-making of switching fast at Fast Transferring Information between dual homed node and dual homed intra-node, realize business switching fast under dual-homing protection scene, particularly, this process comprises:
The quick inter-node communication module of step 504, home node sends to peer node by inter-node communication passage the relevant alarm status information of this node;
Conventionally adopt at present message format as shown in Figure 6, adopt message transmission of information between node of this form, not guarantee information transmission efficiency.As shown in Figure 7, be the MPLS-TP PW OAM heading form schematic diagram of realizing one of fast state notice mode between dual-homed node, MPLS-TP provides quick OAM message, can between node, realize the information of ms level and transmit fast; As shown in Figure 8, it is the message content form schematic diagram of realizing the MPLS-TP PW OAM message of one of fast state notice mode between dual-homed node, this message multiplexing MPLS-TP PW OAM message information physique formula, what new define operation code (OpCode)=62 represented the transmission of this message is PW state information, LAG port status information and the MSP protocol status information (being APS port status information (APS Port State) and APS protection group state (Protect Group State)) of current home node;
Above-mentioned quick inter-node communication passage preferably adopts the quick PW OAM of MPLS-TP message, but is not limited to this message;
The quick inter-node communication module of step 505, home node receives the relevant alarm status information of peer node by express passway;
The quick inter-node communication module of step 506, home node is sent the relevant alarm status information of peer node to switch fast decision-making module by express passway;
The switching fast decision-making module and will switch decision information by express passway and send to and switch fast Executive Module of step 507, home node.
Adopt said method, effectively promoted the switching performance of bearer network equipment double-returning protection switching.
One of ordinary skill in the art will appreciate that all or part of step in said method can come instruction related hardware to complete by program, said procedure can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described, only with reference to preferred embodiment, the present invention is had been described in detail.Those of ordinary skill in the art should be appreciated that and can modify or be equal to replacement technical scheme of the present invention, and do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. a home node, comprises configuration module, quick alarm detection module, switches decision-making module and switch Executive Module, it is characterized in that, described home node also comprises:
Quick inter-node communication module, for receiving the present node alarm status information after the variation that described quick alarm detection module sends, sends the present node alarm status information after described variation by inter-node communication passage to opposite end home node; And, receive the peer node alarm status information after the variation that described opposite end home node sends by described inter-node communication passage, to switching fast decision-making module, send the peer node alarm status information after described variation;
The described decision-making module of switching fast, for receiving the peer node alarm status information after the described variation that described quick inter-node communication module sends, according to peer node warning information after described variation, generate and switch decision-making, and switch decision-making to switching fast Executive Module described in sending;
The described Executive Module of switching fast, for receive described switch fast that decision-making module sends described in switch decision-making, according to described, switch decision-making and carry out and switch.
2. home node according to claim 1, is characterized in that:
Described quick inter-node communication module, specifically for send the message of the present node alarm status information after described variation of carrying to described opposite end home node by described inter-node communication passage, and, receive the message that carries the peer node alarm status information after described variation that described opposite end home node sends by described inter-node communication passage, described message comprises that transmitting multi protocol label exchanges (MPLS-TP) parallel (PW) operation management (OAM) message.
3. home node according to claim 2, is characterized in that:
The field that comprises the PW state information, link aggregation (LAG) port status information and multiplex section protection (MSP) the protocol status information that represent corresponding home node in described MPLS-TP PW OAM message.
4. according to the home node described in the arbitrary claim of claim 1-3, it is characterized in that:
Described quick inter-node communication module, describedly switch fast decision-making module, described Executive Module and the described inter-node communication passage switched fast all adopts hardware to realize.
5. home node according to claim 4, is characterized in that:
Described home node is applied in dual-homing protection networking.
6. a method that realizes double-returning protection switching, is characterized in that, the method comprises:
Peer node alarm status information after the variation that current home node sends by hardware communications passage reception opposite end home node;
Described current home node is according to described peer node alarm status Information generation switching strategy, and carries out and switch according to this switching strategy.
7. method according to claim 6, is characterized in that, described method also comprises:
Described current home node detects present node alarm status information, and after described present node alarm status information being detected and changing, by described hardware communications passage, to described opposite end home node, send the present node alarm status information after changing.
8. according to the method described in claim 6 or 7, it is characterized in that:
Peer node alarm status information after described variation or the present node alarm status information after described variation are carried in message, and described message comprises that transmitting multi protocol label exchanges (MPLS-TP) parallel (PW) operation management (OAM) message.
9. method according to claim 8, is characterized in that:
The field that comprises the PW state information, link aggregation (LAG) port status information and the MSP protocol status information that represent corresponding home node in described MPLS-TP PW OAM message.
10. method according to claim 9, is characterized in that:
Described method is applied in double-returning protection switching scene.
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