CN102571449B - The switching method and device of link - Google Patents
The switching method and device of link Download PDFInfo
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- CN102571449B CN102571449B CN201210034892.8A CN201210034892A CN102571449B CN 102571449 B CN102571449 B CN 102571449B CN 201210034892 A CN201210034892 A CN 201210034892A CN 102571449 B CN102571449 B CN 102571449B
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Abstract
The invention discloses a kind of switching method of link and devices, in the above-mentioned methods, when primary link failure is eliminated, obtain the current state information of outer layer tunnel；Pending link switching operation is determined according to the current state information of outer layer tunnel.The technical solution provided according to the present invention has reached under complicated network environment, eliminates in primary link failure, during switching to primary link by standby link, reduces the loss of data packet, increase the effect of the Stability and dependability of network transmission.
Description
Technical field
The present invention relates to the communications fields, in particular to the switching method and device of a kind of link.
Background technique
Network high-speed development today, in order to meet telecommunications network, broadcasting and television network, the internet integration of three networks greatly become
Gesture, business convergence speed when operator is to network failure is paid much attention to, adjacent in any one nodes break down
Node traffic switching time is less than 50ms, and the business convergence time, which is less than 1s, end to end gradually becomes the threshold grade of bearer network
Index.It is some for the quick heavy-route (Fast of correlation caused by solution different faults point in order to reach the demand
ReRoute, referred to as FRR) technology all comes into being, such as: the quick heavy-route of Internet protocol (IP FRR), label distribution association
Discuss quick heavy-route (LDP FRR), multiprotocol label switching flow exchanges quick heavy-route (MPLS TE FRR), virtual private
The quick heavy-route of network (VPN FRR).
LDP FRR technology is the technology of a solution MPLS network reliability, completes network event by active and standby label technique
The 50ms switch function of barrier develops by means of this most widely used tag distribution protocol of LDP.Usually in default situations
Under, which is route assignment label under the autonomous label distribution in downstream and free label holding mode, but
For a label of connection distribution end to end.
MPLS TE FRR technology is existing one of the most common technology for solving failure fast switching, its original substantially
Reason is traffic engineering tunnel end to end to be established between two provider edge router (PE) equipment, and being need to be to be protected primary
Label switched path (LSP) establishes spare LSP in advance, when equipment detects primary LSP unavailable (node failure or link
Failure) when, flow is switched on spare LSP, to realize quickly switching for business.
VPN FRR is a kind of using the VPN route fast handoff technique based on VPN, by being arranged in far-end PE in advance
It is directed toward the standby usage forwarding item of primary PE and spare PE, and combines PE failure quick detection, it is intended to solve Customer Edge router
(CE) in the MPLS VPN network of dual homed PE, teleservice convergence time caused by PE node failure long (being greater than 1s) is asked
Topic, while solving the problems, such as that PE node failure recovery time is related to the quantity for the VPN route that it is carried, occur in PE node
In the case where failure, the convergence time of teleservice is less than 1s.
However, the related FRR technology of above-mentioned introduction does not require the stability of flow qualitatively.But due to existing
In the network environment that operators at different levels are complicated for reality, new demand is constantly proposed, while the requirement to equipment constantly mentions
Height gradually develops to multiple service supporting by offer single service, such as: the network of operator is by providing single level VPN to more
Level VPN is blended, for the practical network environment of complexity of similar multi-service fusion, in fault recovery, and network re-convergence,
I.e. switchback acts.Practical network environment or the unstability of all kinds of detections, it is possible to which leading to switch the packet loss time is more than that can hold
By range, and there is oscillatory occurences, to increase the unstability of network.
In existing FRR application scenarios, if primary link breaks down, standby link is switched to after supervention by primary link
Send data.When the Failure elimination of primary link, then the normal primary link of recovery is switched to by standby link and continue to send data.By
During standby link switches to primary link, there are problems that following two:
Problem one: Fig. 1 is to dispose schematic diagram according to the network of the CE dual homed PE of the relevant technologies.As shown in Figure 1, CE1 distinguishes
Notice routing VPN route is established Multiprotocol Border Gateway Protocol (MBGP) neighbours to PE1, PE2, PE1, PE2 with PE3 respectively and is closed
System, transmitting fourth edition VPN (VPNV4) route, and VPN FRR is formed on PE3, and the active and standby path of flow of CE2 access CE1 is respectively as follows:
CE2-PE3-P1-PE1-CE1 (main path)；
CE2-PE3-P2-PE2-CE1 (standby path).
When PE1 node failure, PE3 detects (BFD), multiprotocol label switching operation management maintainance by two-way converting
(MPLSOAM) etc. after detection techniques detect that the outer layer tunnel of PE3 and PE1 is unavailable, it will be immediately switched to standby path into
Row forwarding.When PE1 node failure restores, if status of primary link shakes, flow switching concussion will affect.
Problem two: Fig. 2 is to bridge network environment schematic diagram according to the L2VPN/L3VPN of the relevant technologies.As shown in Fig. 2, PE2
Emulation pseudo-wire (PW) is established with PE3, PE4 respectively, forms L2VPN network；PE1 establishes MBGP neighbours with PE3, PE4 formation respectively
Relationship, interaction VPNV4 route to be formed, and form L3VPN network.PE3 and PE4 bridges PE as L2VPN/L3VPN, passes through virtual group
Two three layers of virtual interfaces of L3 access interface (access) and L2 termination interface (terminal) are carried out ring by (virtual group)
Tieback enters.There is PW redundancy protecting group on PE2, active and standby path is respectively as follows: PE2-PE3 (master), PE2-PE4 (standby).It is formed on PE1
VPN FRR Protection path is respectively as follows: PE1-PE3 (master), PE1-PE4 (standby): when PE3 device fails or when restarting,
L2VPN, L3VPN are switched to standby path.
When PE3 equipment fault is eliminated, since the effective time of L2VPN and L3VPN agreement is inconsistent, cause on PE1
When L3VPN network elder generation's switchback is to main path, the data packet of CE2 is sent to since the PW of the PE4-PE3 in PE4 equipment lacks from CE1
The setting of effective time, the phenomenon that leading to a large amount of packet losses or stop.
It can be seen that lacking one kind in the related technology when primary link failure is eliminated, switch from standby link chain linked to owner road
In the process, the solution for causing data packet largely to lose or stop because of the state labile of primary link.
Summary of the invention
The present invention provides a kind of switching method of link and devices, at least to solve in the related technology in primary link failure
Eliminate, from standby link chain linked to owner road switching during, cause because of the state labile of primary link data packet largely lose or
The problem of cutout.
According to an aspect of the invention, there is provided a kind of switching method of link.
The switching method of link according to the present invention includes: to obtain the current of outer layer tunnel when primary link failure is eliminated
Status information；Pending link switching operation is determined according to the current state information of outer layer tunnel.
Preferably, when primary link failure is eliminated, further includes: obtain the current of primary link and standby link by Routing Protocol
Status information；The time point that primary link failure is eliminated is determined according to the current state information of primary link and standby link.
Preferably, above-mentioned Routing Protocol is one of the following: Border Gateway Protocol, static routing protocol.
Preferably, above-mentioned pending link switching operation includes: to be immediately performed the chain that primary link is switched to from standby link
Road handover operation.
Preferably, above-mentioned pending link switching operation includes: and executes when reaching preset delay time from standby chain
Road switches to the link switching operation of primary link.
Preferably, the above-mentioned current state information according to outer layer tunnel determines that pending link switching operation includes: root
Judge to preset in quick heavy-route list item information that primary link and standby link are collectively formed according to the current state information of outer layer tunnel
Delay switchback status indicator position whether come into force；When delay switchback status indicator position is come into force, believed according to quick heavy-route list item
Breath determines pending link switching operation.
Preferably, above-mentioned before preset delay time reaches, further includes: to be grasped using the forwarding that standby link executes data packet
Make.
According to another aspect of the present invention, a kind of switching device of link is provided.
The switching device of link according to the present invention includes: the first acquisition module, for obtaining when primary link failure is eliminated
Take the current state information of outer layer tunnel；First determining module, for being determined according to the current state information of outer layer tunnel wait hold
Capable link switching operation.
Preferably, above-mentioned apparatus further include: second obtains module, for obtaining primary link and standby link by Routing Protocol
Current state information；Second determining module, for determining primary link event according to the current state information of primary link and standby link
Hinder the time point eliminated.
Preferably, above-mentioned apparatus further includes with one of lower module: the first switching module is cut for being immediately performed from standby link
Shift to the link switching operation of primary link；Second switching module, for executing from standby link when reaching preset delay time
Switch to the link switching operation of primary link.
Preferably, above-mentioned first determining module includes: judging unit, for being sentenced according to the current state information of outer layer tunnel
Whether preset delay switchback status indicator position gives birth in the quick heavy-route list item information that disconnected primary link and standby link are collectively formed
Effect；Determination unit, for determining that pending link is cut according to quick heavy-route list item information when judging unit output is is
Change operation.
Through the invention, using when determining the time point that primary link failure is eliminated, pass through the current of acquisition outer layer tunnel
Status information solves and disappears in the related technology in primary link failure to determine that the link switching between primary link and standby link operates
It removes, during the switching of standby link chain linked to owner road, data packet is caused largely to lose or break because of the state labile of primary link
The problem of stream, and then reached under complicated network environment, it is eliminated in primary link failure, the process of primary link is switched to by standby link
In, the loss of data packet is reduced, the effect of the Stability and dependability of network transmission is increased.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is to dispose schematic diagram according to the network of the CE dual homed PE of the relevant technologies；
Fig. 2 is to bridge network environment schematic diagram according to the L2VPN/L3VPN of the relevant technologies；
Fig. 3 is the flow chart of the switching method of link according to an embodiment of the present invention；
Fig. 4 is the flow chart of the switching method of link according to the preferred embodiment of the invention；
Fig. 5 is the structural block diagram of the switching device of link according to an embodiment of the present invention；And
Fig. 6 is the structural block diagram of the switching device of link according to the preferred embodiment of the invention.
Specific embodiment
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and in combination with Examples.It should be noted that not conflicting
In the case of, the features in the embodiments and the embodiments of the present application can be combined with each other.
Fig. 3 is the flow chart of the switching method of link according to an embodiment of the present invention.As shown in figure 3, this method is mainly wrapped
Include following processing:
Step S302: when primary link failure is eliminated, the current state information of outer layer tunnel is obtained；
Step S304: determine that pending link switching operates according to the current state information of outer layer tunnel.
In the related technology, it is eliminated in primary link failure, during the switching of standby link chain linked to owner road, because of the shape of primary link
State is unstable and data packet is caused largely to lose or stop.Using method as shown in Figure 3, in the Failure elimination of primary link,
By obtaining the current state information of outer layer tunnel, with the pending link switching operation of determination, so as to avoid in primary link
When Failure elimination, since the state of outer layer tunnel is uncertain, and primary link, caused a large amount of numbers directly are switched to from standby link
According to the loss of packet, and then improve the reliability and stability of network transmission.
Preferably, can also include following processing when primary link failure is eliminated in step s 302:
(1) current state information of primary link and standby link is obtained by Routing Protocol；
(2) time point of primary link failure elimination is determined according to the current state information of primary link and standby link.
For example, above-mentioned Routing Protocol can be but be not limited to following one: Border Gateway Protocol, static routing protocol.
In a preferred embodiment, the current state information of primary link and standby link is obtained by Routing Protocol, so that it is determined that
Primary link failure eliminates state point (i.e. above-mentioned primary link failure eliminate time point), realizes data packet in primary link with this
Routing forwarding；But for above-mentioned Border Gateway Protocol, static agreement VPN route generated, it is also necessary to obtain above-mentioned step
The current state information of outer layer tunnel in rapid S302, to realize private network data packet in the label forwarding of primary link.Work as primary link
State can satisfy label forwarding in the case where, just execute standby link switch to primary link link switching operation.By upper
The generation for phenomena such as stating delay switchback operation, avoiding a large amount of packet losses caused by status of primary link concussion.
In a preferred embodiment, for the primary link originally to break down, in its fault recovery, pass through Routing Protocol weight
Newly choosing the link originally to break down is current preference forward-path.
Preferably, above-mentioned pending link switching operation can include but is not limited to one of following operation:
The first operation: it is immediately performed the link switching operation that primary link is switched to from standby link；
Second of operation: when reaching preset delay time, the link switching that primary link is switched to from standby link is executed
Operation.
It in a preferred implementation process, can also include: that data are executed using standby link before preset delay time reaches
The forwarding of packet operates.
In a preferred embodiment, it can be assisted by routings such as above-mentioned Border Gateway Protocol (BGP) or static routing protocols
View carries out the delay time configuration of Wait to Restore Time (WTR).That is, not being immediately performed when primary link failure is eliminated from standby link
Switch to the link switching operation of primary link.When the current state for restoring normal primary link is unstable, standby chain is continued to use
Road forwards data packet, and switchback and then prevents status of primary link concussion from influencing flow to primary link again after can waiting for a period of time
Phenomena such as switching concussion, serious packet loss.
Preferably, in step s 304, determine that pending link switching is grasped according to the current state information of outer layer tunnel
Making (pending link switching operation herein is second of operation) may further include:
(1) quick heavy-route table that primary link and standby link are collectively formed is judged according to the current state information of outer layer tunnel
Whether preset delay switchback status indicator position comes into force in item information；
(2) when delay switchback status indicator position is come into force, pending link is determined according to quick heavy-route list item information
Handover operation.
Above-mentioned preferred embodiment is further described below with reference to Fig. 4.
Fig. 4 is the flow chart of the switching method of link according to the preferred embodiment of the invention.As shown in figure 4, preferred at this
In embodiment, application scenarios are L2VPN/L3VPN bridge joint network environments, and PE2 establishes PW with PE3, PE4 respectively, forms L2VPN net
Network, and it is (main: PE2-PE3, standby: PE2-PE4) to dispose PW redundancy protecting.PE1 establishes MBGP neighborhood with PE3, PE4 respectively,
Interaction VPNV4 routes to be formed, and forms L3VPN network, and bgp protocol deployment FRR is (main: PE1-PE3, standby: PE1-PE4), and to configure
FRR WTR postpones switchback strategy.PE3 and PE4 bridges PE as L2VPN/L3VPN, will by virtual group group
Two three layers of virtual interfaces of L3access and L2terminal carry out loopback access.
Step S402:PE2 establishes routing between PE3, PE4 respectively, while establishing outer layer tunnel；
Step S404:PE2 establishes two PW with PE3, PE4 respectively, and by PW be tied to PW protection group (it is main: PE2-PE3,
It is standby: PE2-PE4), configuration WTR delay switchback strategy and the double receipts strategies of double hairs；
Step S406:PE1 establishes routing between PE3, PE4 respectively, while establishing outer layer tunnel；
Step S408:PE1 establishes MBGP neighborhood with PE3, PE4 formation respectively, and interaction VPNV4 routes to form L3VPN
Network；
Step S410:BGP agreement disposes FRR, and reconfiguration latency switchback strategy (time configuration can be with are as follows: 1-12, unit:
Minute)；
Step S412:PE3 and PE4 bridges PE as L2VPN/L3VPN, by virtual group group by L3access
With two three layers of virtual interfaces of L2terminal, loopback access is carried out；
Step S414: when equipment PE3 is restarted, the flow of CE1-CE2 walks CE1-PE1-PE4-PE2-CE2.The stream of CE2-CE1
Amount walks CE2-PE2-PE4-PE1-CE1, and final agreement will also converge to above-mentioned path；
Step S416: after equipment PE3 restarts a period of time, PE3 re-establishes routing with PE1, PE2's, and PE4 is set
Standby, bgp protocol recalculates active and standby routing, and is judged according to the current state information of primary link, standby link, identification event
Barrier restores state point；
Step S418: when determining identification fault recovery state point, according to the current state information of outer layer tunnel, judge to lead
Whether preset delay switchback status indicator position comes into force in the quick heavy-route list item information that link and standby link are collectively formed.Such as
Fruit needs to come into force, and the WTR for routing of purchasing comes into force position；
Step S420: the related FRR list item information being collectively formed by calculating primary link to standby link, and according to standby routing
WTR come into force position whether come into force to determine whether execute delay switchback operation.If necessary to execute delay switchback, it is specific to set FRR
The practical forwarding position of list item is standby path, and FRR is carried out WTR delay and is waited, while issuing FRR list item, is forwarded practical in engine
Forward-path remains as standby path；
Step S422: timers trigger FRR delay time time-out, setting the practical forwarding position of FRR list item is main path, and is issued
Engine is forwarded, practical forward-path is walked in main path, and the flow that CE1 is sent to CE2 switches to the road CE1-PE1-PE3-PE2-CE2
Diameter.
Fig. 5 is the structural block diagram of the switching device of link according to an embodiment of the present invention.As shown in figure 5, the link is cut
Changing device specifically includes that the first acquisition module 10, for when primary link failure is eliminated, obtaining the current state letter of outer layer tunnel
Breath；First determining module 20 determines pending link switching operation for the current state information according to outer layer tunnel.
It using device as shown in Figure 5, realizes under complicated network environment, eliminates in primary link failure, cut by standby link
During shifting to primary link, the loss of data packet is reduced, increases the Stability and dependability of network transmission.
Preferably, as shown in fig. 6, above-mentioned apparatus can also include: the second acquisition module 30, for being obtained by Routing Protocol
Take the current state information of primary link and standby link；Second determining module 40, for the current shape according to primary link and standby link
State information determines the time point that primary link failure is eliminated.
Preferably, as shown in fig. 6, one of above-mentioned apparatus can also comprise the following modules: the first switching module 50, for standing
Execute the link switching operation that primary link is switched to from standby link；Second switching module 60, in preset delay time
When arrival, the link switching operation that primary link is switched to from standby link is executed.
Preferably, as shown in fig. 6, above-mentioned first determining module 20 may further include: judging unit 200 is used for root
Judge to preset in quick heavy-route list item information that primary link and standby link are collectively formed according to the current state information of outer layer tunnel
Delay switchback status indicator position whether come into force；Determination unit 202, when for exporting in judging unit to be, according to quick weight
Route table items information determines pending link switching operation.
The preferred working method that each module and each unit in above-mentioned apparatus be combined with each other, specifically may refer to Fig. 3-Fig. 4
Description, details are not described herein again.
It can be seen from the above description that the present invention realizes following technical effect: using and determining primary link failure
When the time point of elimination, the current state information by obtaining outer layer tunnel is cut with the link determined between primary link and standby link
Operation is changed, solves and is eliminated in the related technology in primary link failure, during the switching of standby link chain linked to owner road, because of primary link
State labile and the problem of cause data packet largely to lose or stop, and then reached under complicated network environment, in main chain
Road Failure elimination during switching to primary link by standby link, reduces the loss of data packet, increases the stability of network transmission
With the effect of reliability.
Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
It is performed by computing device in the storage device, and in some cases, it can be to be different from shown in sequence execution herein
Out or description the step of, perhaps they are fabricated to each integrated circuit modules or by them multiple modules or
Step is fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific hardware and softwares to combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (11)
1. a kind of switching method of link characterized by comprising
When primary link failure is eliminated, the current state information of outer layer tunnel is obtained；
It determines that the primary link meets label forwarding condition according to the current state information of the outer layer tunnel, executes link switching
Operation.
2. the method according to claim 1, wherein when the primary link failure is eliminated, further includes:
The current state information of the primary link and standby link is obtained by Routing Protocol；
The time point that the primary link failure is eliminated is determined according to the current state information of the primary link and the standby link.
3. according to the method described in claim 2, it is characterized in that, the Routing Protocol is one of the following:
Border Gateway Protocol, static routing protocol.
4. the method according to claim 1, wherein execution link switching operation includes:
It is immediately performed the link switching operation that the primary link is switched to from standby link.
5. the method according to claim 1, wherein execution link switching operation includes:
When reaching preset delay time, the link switching operation that the primary link is switched to from standby link is executed.
6. according to the method described in claim 5, it is characterized in that, determining institute according to the current state information of the outer layer tunnel
It states primary link and meets label forwarding condition, execute link switching operation, comprising:
The quick weight that the primary link and the standby link are collectively formed is judged according to the current state information of the outer layer tunnel
Whether preset delay switchback status indicator position comes into force in route table items information；
When delay switchback status indicator position is come into force, the execution link is determined according to the quick heavy-route list item information
Handover operation.
7. according to the method described in claim 5, it is characterized in that, before the preset delay time reaches, further includes:
The forwarding operation of data packet is executed using the standby link.
8. a kind of switching device of link characterized by comprising
First obtains module, for obtaining the current state information of outer layer tunnel when primary link failure is eliminated；
First determining module, for determining that the primary link meets label forwarding according to the current state information of the outer layer tunnel
Condition executes link switching operation.
9. device according to claim 8, which is characterized in that described device further include:
Second obtains module, for obtaining the current state information of the primary link and standby link by Routing Protocol；
Second determining module, for determining the primary link event according to the current state information of the primary link and the standby link
Hinder the time point eliminated.
10. device according to claim 8, which is characterized in that described device further includes with one of lower module:
First switching module, for being immediately performed the link switching operation for switching to the primary link from standby link；
Second switching module, for executing from the standby link and switching to the primary link when reaching preset delay time
Link switching operation.
11. device according to claim 8, which is characterized in that first determining module includes:
Judging unit, for judging that the primary link and standby link are collectively formed according to the current state information of the outer layer tunnel
Quick heavy-route list item information in preset delay switchback status indicator position whether come into force；
Determination unit, when for exporting in the judging unit to be, according to the quick heavy-route list item information determination
Execute link switching operation.
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| CN103888351B (en) | 2012-12-20 | 2017-12-15 | 联想企业解决方案（新加坡）私人有限公司 | The method and device of multiple sessions is managed in the network based on Multi-path route |
| CN104518914B (en) * | 2014-12-17 | 2018-03-02 | 华为技术有限公司 | Link switch-over method and equipment |
| CN109600310A (en) * | 2018-12-21 | 2019-04-09 | 安徽皖兴通信息技术有限公司 | A kind of pw linear protection function switchback method of vpls |
| CN115277545A (en) * | 2022-06-21 | 2022-11-01 | 浪潮通信技术有限公司 | Main/standby network switching method and device |
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| CN102315987A (en) * | 2011-09-13 | 2012-01-11 | 中兴通讯股份有限公司 | Ring network protection group link switching method and device |
| CN102355363A (en) * | 2011-08-12 | 2012-02-15 | 中兴通讯股份有限公司 | Method and apparatus for automatic protection switching |
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| CN101150587B (en) * | 2007-10-24 | 2010-07-07 | 华为技术有限公司 | A method, device and system for traffic switching of multi-protocol label switching traffic engineering |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355363A (en) * | 2011-08-12 | 2012-02-15 | 中兴通讯股份有限公司 | Method and apparatus for automatic protection switching |
| CN102315987A (en) * | 2011-09-13 | 2012-01-11 | 中兴通讯股份有限公司 | Ring network protection group link switching method and device |
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