CN103490969A - System and method for achieving VPWS redundancy protection rapid convergence - Google Patents
System and method for achieving VPWS redundancy protection rapid convergence Download PDFInfo
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Abstract
The invention discloses a system and method for achieving VPWS redundancy protection rapid convergence and relates to the technical field of network communication. The system comprises an access-side PE device A, a convergence-side primary PE device B and a convergence-side standby PE device C. The access-side PE device A comprises a first BFD/MPLS-TP OAM module, a first VPWS control module and an ARP/NDP caching transmitting module. The convergence-side primary PE device B comprises a second BFD/MPLS-TP OAM module, a second VPMS control module and a first ARP/NDP module. The convergence-side standby PE device C comprises a third BFD/MPLS-TP OAM module, a third VPWS control module and a second ARP/NDP module. By the adoption of the system and method for achieving VPWS redundancy protection rapid convergence, rapid switching of downlink services can be achieved, the protection requirement of interruption of a telecommunication network at the level of 50ms can be met, the stability and the safety of the network are improved, and the user experience is improved.
Description
Technical field
The present invention relates to network communications technology field, particularly relate to a kind of VPWS(Virtual of realization Pseudo Wire Service, virtual private circuit business) system and method for redundancy protecting Fast Convergent.
Background technology
Arrival along with mobile Internet age, telecommunication service changes data service into gradually from original speech business, and each large operator strengthens the investment to wireless network, constantly increases when building wireless base station, need to build larger Mobile data return network, support transmission and the carrying of large data.At the Access Layer of wireless backhaul network, generally use VPWS to realize service bearer.One of VPWS is L2VPN(Layer2Virtual Private Network, Layer 2 virtual private network) application technology.L2VPN provides a kind of Private of VPN(Virtual flexibly Network, Virtual Private Network for the user) service.The L2VPN application technology mainly is divided into 2 kinds: VPLS(Virtual Private Line Service, virtual special local area network) and VPWS.VPWS is based on the IP(Internet Protocol of operator, Internet protocol)/MPLS(Multi-Protocol Label Switching, multiprotocol label switching) network provides the L2VPN business of point-to-point form for the user.In order to realize this application, at PE(Provider Edge, provider edge router) set up PW(Pseudo Wire, pseudo-line between equipment), thereby realize the transparent transmission of Layer 2 data isl frame between equipment.In the mobile wireless return network, reliability is very important, generally all can use PW redundant configuration protection passback business, by the PW dual homed to convergence-level PE equipment, enable BFD(Bidirectional Forwarding Detection simultaneously, two-way converting detects) or MPLS-TP(MPLS-Transport Profile, be responsible for standard formulation by IETF/ITU-T JWT working group, a kind of connection-oriented packet switching network technology, the subset of MPLS) OAM(Operation Administration and Maintenance, operation, management, maintenance) accelerate the detection of fault, pass through afterwards the convergence-level network to purpose network equipment RNC(Radio Network Controller, radio network controller) forwarded.
Shown in Figure 1, in networking under mobile Internet return network scene, BTS(Base Transceiver Station, base station) as Customer Premises Network equipment, network insertion side PE device A is as customer access equipment, be generally the data communications equipment of supporting the VPWS function, for the access user side network equipment.Networks converge side PE equipment B, C, as wireless traffic side gateway, are equivalent to the convergence-level data communications equipment, RNC(Radio Network Controller, radio network controller) as the purpose network equipment.Business between from BTS to RNC is uplink service, and the business between from RNC to BTS is downlink business.BTS is by AC(Attachment Circuit, place in circuit) access device A, pass through L2(Layer2 between device A and equipment B, C, link layer) interface is set up active and standby PW, B, C equipment configuration VE Group(Virtual Ethernet Group, the Virtual Ethernet group) by L2VE(L2Virtual Entity, 2 layers of actual situation example) and L3VE(L3Virtual Entity, 3 layers of actual situation example) interface is bound, and realizes the termination of L2 business.Under normal circumstances, uplink service and downlink business are by primary PW carrying.Primary PW breaks down after (link failure or the power down of primary PE equipment B), and uplink service and downlink business switch to standby PW carrying.After fault recovery, uplink service and downlink business return in primary PW.
Generally, when business starts to set up, BTS initiates ARP(Address Resolusion Protocol to gateway, address resolution protocol, the IPv4 business)/NDP(Neighbor Discovery Protocol, Neighbor Discovery Protocol, the IPv6 business) request, device A can forward this ARP/NDP request to primary PE equipment B and standby PE equipment C simultaneously, and after waiting for that primary PE equipment B and standby PE equipment C learn the ARP/NDP of BTS, downlink business normally forwards.If link failure or the power down of primary PE equipment B appear in primary PW, standby PE equipment C is without re-starting ARP/NDP study, and the up-downgoing business can realize switching fast.If but situation about recovering at primary PW, after perhaps primary PE equipment B restarts, need to relearn ARP/NDP, if so business before the ARP/NDP learning success, return to primary on, convergence rate depends on the pace of learning of ARP/NDP so, and practice finds that this time interval is long, causes the interruption of the long period of downlink business, reduce reliability and the quality of carrier class business, do not meet more and more harsher user and experience.In prior art, can point to the cost of the destination address that reaches certain route indication by the cost(of configuration route) value delays the recovery of downlink business.But the described method of prior art is comparatively complicated.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned background technology; a kind of system and method for the VPWS of realization redundancy protecting Fast Convergent is provided; can realize the quick switching of downlink business; meet the protection demand that communication network level 50ms interrupts; strengthen stability, the fail safe of network, promote user's experience.
The invention provides a kind of system of the VPWS of realization redundancy protecting Fast Convergent, comprise access side PE device A, converge the primary PE equipment B of side and standby PE equipment C, described access side PE device A comprises a BFD/MPLS-TP OAM module, the one VPWS control module and ARP/NDP Buffer forwarding module, converge the primary PE equipment B of side and comprise the 2nd BFD/MPLS-TP OAM module, the 2nd VPWS control module and an ARP/NDP module, converge the standby PE equipment of side C and comprise the 3rd BFD/MPLS-TP OAM module, the 3rd VPWS control module and the 2nd ARP/NDP module, wherein:
The one BFD/MPLS-TP OAM module, the 2nd BFD/MPLS-TP OAM module, the 3rd BFD/MPLS-TP OAM module, all, for monitoring PW link-state information, realize the signalling trouble function;
The one VPWS control module, for: receive configuration, the management of VPWS, treatments B FD/MPLS-TP OAM notice, and trigger ARP/NDP Buffer forwarding function;
The 2nd VPWS control module, the 3rd VPWS control module, all for: receive configuration, the management of VPWS, treatments B FD/MPLS-TP OAM notice;
ARP/NDP Buffer forwarding module, for: carry out the ARP/NDP study, aging and two of BTS base station, twoly bristle with anger from active and standby PW broadcast;
The one ARP/NDP module, the 2nd ARP/NDP module, all for: realize the ARP/NDP learning functionality.
The present invention also provides the method that realizes VPWS redundancy protecting Fast Convergent based on said system, comprises the following steps:
S1, BTS are by AC link access access side PE device A, access side PE device A configures active and standby PW and terminates to respectively and converge the primary PE equipment B of side and standby PE equipment C, set up active and standby PW VPWS is carried out to redundancy protecting: L3VE interface configuration identical ip addresses and the MAC Address of primary PE equipment B and standby PE equipment C, BTS data service gateway is B equipment L3VE interface IP address;
The one VPWS control module of S2, device A enables ARP/NDP Buffer forwarding function on the L2 interface of configuration VPWS;
When S3, data service are up, BTS sends the ARP/NDP request message to gateway, when device A receives the ARP/NDP request message from the AC interface, ARP/NDP Buffer forwarding module is at first by the two L3VE interfaces of ARP/NDP request message to the L3VE interface that converges the primary PE equipment B of side and standby PE equipment C of sending out of active and standby PW, and an ARP/NDP module and the 2nd ARP/NDP modules learn are to the MAC of base station; ARP/NDP Buffer forwarding module is recorded source IP, source MAC and the gateway IP of BTS in the mode of an ARP/NDP entry;
When S4, data service are descending, if converge the primary PE equipment B of side, have the ARP/NDP that arrives BTS, downlink business is without carrying out ARP/NDP study, and downlink business is carried to primary PW fast; If there is not the ARP/NDP that arrives BTS in primary PE equipment B equipment, primary PE equipment B initiatively sends the ARP/NDP request message to BTS; After BTS response ARP/NDP request, send the ARP back message using to primary PE equipment B, the ARP/NDP Buffer forwarding module of device A receives BTS ARP/NDP back message using, two ARP/NDP back message usings are to primary PE equipment B and standby PE equipment C, and the arp cache forwarding module is recorded the ARP/NDP back message using of BTS simultaneously;
If link failure or the power down of primary PE equipment B appear in the primary PW of S5, uplink service is switched to standby PW immediately according to BFD or MPLS-TP OAM fault warning, and downlink business is switched to standby PW according to fault warning equally;
S6, primary PW recover or primary PE equipment B is restarted;
The one BFD/MPLS-TP OAM module of S7, device A detects the recovery of active link, notify immediately a VPWS control module, the one VPWS control module notifies ARP/NDP Buffer forwarding module to carry out two of ARP/NDP immediately, the ARP/NDP entry of ARP/NDP Buffer forwarding module stores is sent out by active and standby PW is two, after primary PE equipment B is learnt the MAC of BTS, downlink business returns to primary PE equipment B.
On the basis of technique scheme, the Buffer forwarding of ARP/NDP described in step S3 module is recorded afterwards further comprising the steps of by the source IP, source MAC of BTS and gateway IP in the mode of an ARP/NDP entry: start timer, be responsible for the aging of this ARP/NDP entry; Once timer triggers, will initiatively to BTS, initiate the ARP/NDP request, this ARP/NDP entry is confirmed, if receive the response of BTS, ARP/NDP Buffer forwarding module this timer of resetting, make it not overtime, otherwise delete this ARP/NDP entry; If the MAC of the ARP/NDP back message using that ARP/NDP Buffer forwarding module is received changes, ARP/NDP Buffer forwarding module is upgraded this ARP/NDP entry, sends to converging the primary PE equipment B of side and standby PE equipment C the ARP/NDP request of upgrading later immediately simultaneously.
Compared with prior art, advantage of the present invention is as follows:
The present invention can realize the quick switching of downlink business; meet the protection demand that communication network level 50ms interrupts; strengthen stability, the fail safe of network; promote user's experience; be applicable to the support L2 of operator's framework, the network environment of L3VPN; BTS equipment or subscriber equipment, through the L2 Access Network, then are connected to core network, have solved VPWS business PW when configuration VPWS redundancy protecting in the past and have switched the problem that causes the downlink business long period to interrupt.
The accompanying drawing explanation
Fig. 1 is the networking schematic diagram under mobile Internet return network scene.
Fig. 2 is the structured flowchart of realizing the system of VPWS redundancy protecting Fast Convergent in the embodiment of the present invention.
Fig. 3 is the flow chart of realizing the method for VPWS redundancy protecting Fast Convergent in the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Shown in Figure 2, the embodiment of the present invention provides a kind of system of the VPWS of realization redundancy protecting Fast Convergent, comprise access side PE device A, converge the primary PE equipment B of side and standby PE equipment C, access side PE device A comprises a BFD/MPLS-TP OAM module, the one VPWS control module and ARP/NDP Buffer forwarding module, converge the primary PE equipment B of side and comprise the 2nd BFD/MPLS-TP OAM module, the 2nd VPWS control module and an ARP/NDP module, converge the standby PE equipment of side C and comprise the 3rd BFD/MPLS-TP OAM module, the 3rd VPWS control module and the 2nd ARP/NDP module, wherein:
The one BFD/MPLS-TP OAM module, the 2nd BFD/MPLS-TP OAM module, the 3rd BFD/MPLS-TP OAM module, all, for monitoring PW link-state information, realize the signalling trouble function;
The one VPWS control module, for: receive configuration, the management of VPWS, treatments B FD/MPLS-TP OAM notice, and trigger ARP/NDP Buffer forwarding function;
The 2nd VPWS control module, the 3rd VPWS control module, all for: receive configuration, the management of VPWS, treatments B FD/MPLS-TP OAM notice;
ARP/NDP Buffer forwarding module, for: carry out the ARP/NDP study of BTS base station, aging and two (from active and standby PW broadcast);
The one ARP/NDP module, the 2nd ARP/NDP module, all for: realize the ARP/NDP learning functionality.
Shown in Figure 3, the embodiment of the present invention provides a kind of method of the VPWS of realization redundancy protecting Fast Convergent, comprises the following steps:
S1, take the network structure shown in Fig. 1 as example, BTS is by AC link access access side PE device A, access side PE device A configures active and standby PW and terminates to respectively and converge the primary PE equipment B of side and standby PE equipment C, set up active and standby PW VPWS is carried out to redundancy protecting: L3VE interface configuration identical ip addresses and the MAC Address of primary PE equipment B and standby PE equipment C, BTS data service gateway is B equipment L3VE(tri-layer interfaces, can be sub-interface) interface IP address;
The one VPWS control module of S2, device A enables ARP/NDP Buffer forwarding function on the L2 interface of configuration VPWS;
When S3, data service are up, BTS sends the ARP/NDP request message to gateway, when device A receives the ARP/NDP request message from the AC interface, ARP/NDP Buffer forwarding module is at first by the two L3VE interfaces of ARP/NDP request message to the L3VE interface that converges the primary PE equipment B of side and standby PE equipment C of sending out of active and standby PW, and an ARP/NDP module and the 2nd ARP/NDP modules learn are to the MAC of base station; ARP/NDP Buffer forwarding module is recorded source IP, source MAC and the gateway IP of BTS in the mode of an ARP/NDP entry, and starts timer, is responsible for the aging of this ARP/NDP entry.Once timer triggers, will initiatively to BTS, initiate the ARP/NDP request, this ARP/NDP entry is confirmed, if receive the response of BTS, ARP/NDP Buffer forwarding module this timer of resetting, make it not overtime, otherwise delete this ARP/NDP entry.If the MAC of the ARP/NDP back message using that ARP/NDP Buffer forwarding module is received changes, ARP/NDP Buffer forwarding module is upgraded this ARP/NDP entry, sends to converging the primary PE equipment B of side and standby PE equipment C the ARP/NDP request of upgrading later immediately simultaneously.
When S4, data service are descending, if converge the primary PE equipment B of side, have the ARP/NDP that arrives BTS, downlink business is without carrying out ARP/NDP study, and downlink business is carried to primary PW fast.If there is not the ARP/NDP that arrives BTS in primary PE equipment B equipment, primary PE equipment B initiatively sends the ARP/NDP request message to BTS.After BTS response ARP/NDP request, send the ARP back message using to primary PE equipment B, the ARP/NDP Buffer forwarding module of device A receives BTS ARP/NDP back message using, two ARP/NDP back message usings are to primary PE equipment B and standby PE equipment C, and the arp cache forwarding module is recorded the ARP/NDP back message using of BTS simultaneously.
If link failure or the power down of primary PE equipment B appear in the primary PW of S5, uplink service is switched to standby PW immediately according to BFD or MPLS-TP OAM fault warning, downlink business is switched to standby PW according to fault warning equally, because standby PE equipment C has learnt the MAC of BTS before, so downlink business can be because of the ARP/NDP interrupt.
S6, primary PW recover or primary PE equipment B is restarted;
The one BFD/MPLS-TP OAM module of S7, device A detects the recovery of active link, notify immediately a VPWS control module, the one VPWS control module notifies ARP/NDP Buffer forwarding module to carry out two of ARP/NDP immediately, the ARP/NDP entry of ARP/NDP Buffer forwarding module stores is sent out by active and standby PW is two, after primary PE equipment B is learnt the MAC of BTS, downlink business returns to primary PE equipment B.
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these are revised and modification belongs within the scope of the claims in the present invention and equivalent technologies thereof, these modifications and modification are also within protection scope of the present invention.
The prior art that the content of not describing in detail in specification is known to the skilled person.
Claims (3)
1. a system that realizes VPWS redundancy protecting Fast Convergent, comprise access side PE device A, converge the primary PE equipment B of side and standby PE equipment C, it is characterized in that: described access side PE device A comprises a BFD/MPLS-TP OAM module, the one VPWS control module and ARP/NDP Buffer forwarding module, converge the primary PE equipment B of side and comprise the 2nd BFD/MPLS-TP OAM module, the 2nd VPWS control module and an ARP/NDP module, converge the standby PE equipment of side C and comprise the 3rd BFD/MPLS-TP OAM module, the 3rd VPWS control module and the 2nd ARP/NDP module, wherein:
The one BFD/MPLS-TP OAM module, the 2nd BFD/MPLS-TP OAM module, the 3rd BFD/MPLS-TP OAM module, all, for monitoring PW link-state information, realize the signalling trouble function;
The one VPWS control module, for: receive configuration, the management of VPWS, treatments B FD/MPLS-TP OAM notice, and trigger ARP/NDP Buffer forwarding function;
The 2nd VPWS control module, the 3rd VPWS control module, all for: receive configuration, the management of VPWS, treatments B FD/MPLS-TP OAM notice;
ARP/NDP Buffer forwarding module, for: carry out the ARP/NDP study, aging and two of BTS base station, twoly bristle with anger from active and standby PW broadcast;
The one ARP/NDP module, the 2nd ARP/NDP module, all for: realize the ARP/NDP learning functionality.
2. the method that realizes VPWS redundancy protecting Fast Convergent based on the described system of claim 1, is characterized in that, comprises the following steps:
S1, BTS are by AC link access access side PE device A, access side PE device A configures active and standby PW and terminates to respectively and converge the primary PE equipment B of side and standby PE equipment C, set up active and standby PW VPWS is carried out to redundancy protecting: L3VE interface configuration identical ip addresses and the MAC Address of primary PE equipment B and standby PE equipment C, BTS data service gateway is B equipment L3VE interface IP address;
The one VPWS control module of S2, device A enables ARP/NDP Buffer forwarding function on the L2 interface of configuration VPWS;
When S3, data service are up, BTS sends the ARP/NDP request message to gateway, when device A receives the ARP/NDP request message from the AC interface, ARP/NDP Buffer forwarding module is at first by the two L3VE interfaces of ARP/NDP request message to the L3VE interface that converges the primary PE equipment B of side and standby PE equipment C of sending out of active and standby PW, and an ARP/NDP module and the 2nd ARP/NDP modules learn are to the MAC of base station; ARP/NDP Buffer forwarding module is recorded source IP, source MAC and the gateway IP of BTS in the mode of an ARP/NDP entry;
When S4, data service are descending, if converge the primary PE equipment B of side, have the ARP/NDP that arrives BTS, downlink business is without carrying out ARP/NDP study, and downlink business is carried to primary PW fast; If there is not the ARP/NDP that arrives BTS in primary PE equipment B equipment, primary PE equipment B initiatively sends the ARP/NDP request message to BTS; After BTS response ARP/NDP request, send the ARP back message using to primary PE equipment B, the ARP/NDP Buffer forwarding module of device A receives BTS ARP/NDP back message using, two ARP/NDP back message usings are to primary PE equipment B and standby PE equipment C, and the arp cache forwarding module is recorded the ARP/NDP back message using of BTS simultaneously;
If link failure or the power down of primary PE equipment B appear in the primary PW of S5, uplink service is switched to standby PW immediately according to BFD or MPLS-TP OAM fault warning, and downlink business is switched to standby PW according to fault warning equally;
S6, primary PW recover or primary PE equipment B is restarted;
The one BFD/MPLS-TP OAM module of S7, device A detects the recovery of active link, notify immediately a VPWS control module, the one VPWS control module notifies ARP/NDP Buffer forwarding module to carry out two of ARP/NDP immediately, the ARP/NDP entry of ARP/NDP Buffer forwarding module stores is sent out by active and standby PW is two, after primary PE equipment B is learnt the MAC of BTS, downlink business returns to primary PE equipment B.
3. the method that realizes VPWS redundancy protecting Fast Convergent as claimed in claim 2, it is characterized in that: the Buffer forwarding of ARP/NDP described in step S3 module is recorded afterwards further comprising the steps of by the source IP, source MAC of BTS and gateway IP in the mode of an ARP/NDP entry: start timer, be responsible for the aging of this ARP/NDP entry; Once timer triggers, will initiatively to BTS, initiate the ARP/NDP request, this ARP/NDP entry is confirmed, if receive the response of BTS, ARP/NDP Buffer forwarding module this timer of resetting, make it not overtime, otherwise delete this ARP/NDP entry; If the MAC of the ARP/NDP back message using that ARP/NDP Buffer forwarding module is received changes, ARP/NDP Buffer forwarding module is upgraded this ARP/NDP entry, sends to converging the primary PE equipment B of side and standby PE equipment C the ARP/NDP request of upgrading later immediately simultaneously.
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| CN108075949B (en) * | 2017-12-13 | 2021-03-23 | 安徽皖通邮电股份有限公司 | Method and equipment for realizing RFC2544 in VPWS environment |
| 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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