CN108668308A

CN108668308A - A kind of LTE PTN transmission nets and its static routing guard method

Info

Publication number: CN108668308A
Application number: CN201710202328.5A
Authority: CN
Inventors: 李程贵; 石泉; 车亚南; 王英豪; 刘波
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Group Inner Mongolia Co Ltd
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Group Inner Mongolia Co Ltd
Priority date: 2017-03-30
Filing date: 2017-03-30
Publication date: 2018-10-16
Anticipated expiration: 2037-03-30
Also published as: CN108668308B

Abstract

The present invention provides a kind of LTE PTN transmission nets and its static routing guard methods, including：When the multisection type Peer BFD for being pre-configured with deployment in LTE PTN transmission nets between the first primary PE nodes and the second primary PE nodes detect that IP is unreachable, the corresponding routing of the described first primary PE nodes of judgement is unreachable；It is connected with the primary PE nodes of third between the first primary PE nodes and the second primary PE nodes；The physical interface shutdown that control BFD is linked, so that the primary route of the first primary PE nodes to the primary PE nodes of the third cancels；Activate IP/VPN mixing FRR routings so that the corresponding spare PE nodes of the described first primary PE nodes of next-hop direction of the first primary PE nodes.The present invention realizes the protection of the multipoint fault scene in LTE PTN transmission nets, greatly reduces LTE the whole networks and blocks probability, improves internet security.

Description

A kind of LTE PTN transmission nets and its static routing guard method

Technical field

The present invention relates to wireless communication technology field more particularly to a kind of LTE PTN transmission nets and its static routing to protect Method.

Background technology

Existing LTE passbacks net is built based on PTN, TD-LTE transmission nets networking structure and the following Fig. 1 institutes of discharge model Show, BTS service enters metropolitan area PTN network by accessing PTN, and core node is converged to metropolitan area L3 core sections by metropolitan area L2/L3 Then point is sent to EPC core nets through saving the L3VPN of dry PTN system.Normal condition, all LTE service traffics, webmaster flow rate It is primary to be back to provincial capital's core L3 equipment over long distances to the dry L3 of complex building province of districts and cities by districts and cities complex building L3, finally it is back to EPC core nets.

Wireless traffic is by accessing PTN to deployment MC-PW APS carrying protections between convergence core PTN, dual homed to convergence Core L2/L3 device nodes.Active/standby convergence core PTN nodes are terminated 2 layers by L2VE, and enter static metropolitan area by L3VE L3VPN.Local network LTE PTN core layers and the function of saving dried layer realization L3, local network core layer L2/L3 equipment and L3 equipment groups At " square shape " structure, L3VPN networks are realized, carry out L3 forwardings.It saves the dry L3VPN with districts and cities and then uses Native IP modes Connection.The protection of Metropolitan Area Transmission Network core layer L3VPN levels passes through tunnel Tunnel 1:1 and VPN FRR (Fast ReRoute, Quick heavy-route) it realizes, Tunnel APS are used to protect the tunnel path between node, and VPN FRR are for protecting L3VPN networks Inner link and device node failure configure active and standby next-hop PE nodes to all VRF routings, the failure inspection between PE nodes It surveys, is realized using LSP layers of OAM(Operation Administration Maintenance)s.And province does between the L3VPN of districts and cities and the Native of L3PTN equipment and EPC IP operation docking protected mode is IP/VPN mixing FRR protections.

Through investigating multiple provinces TD-LTE fault conditions in 2015, because transmission local network core layer failure causes LTE bases The significant trouble blocked of standing has a lot of, is related to multiple districts and cities' Metropolitan Area Network (MAN)s, multiple plant equipments, averagely lasts more than 1 hour, this Hidden danger is constituted to the stable operation of network, there is an urgent need to be optimized to transmission net, LTE business is more effectively protected with realizing Shield.

However existing technical solution has the following disadvantages：

1, lack the joint-action mechanism of static state L3VPN and Native IP static routing

It will be seen from figure 1 that the Metropolitan Area Network (MAN) static state L3VPN equipment of existing wet end administration and province lead between doing static state L3VPN equipment Native IP static routing docking is crossed, which can realize the industry of any link or network element Single Point of Faliure in PTN network Business protection.But for the network protection scarce capacity under the complex scenes such as 2 simultaneous faults, network robustness is poor, and there are districts and cities The hidden danger that LTE business will hinder entirely.Concrete analysis is as follows：

Fig. 2 is the fault point schematic diagram of LTE PTN transmission nets, by link between PTN network elements and network element device respectively with number Word 1 to 7 is numbered.It is analyzed with the scene of Fig. 3 transmission net LTE PTN 2 simultaneous faults of core layer, when failure in Fig. 3 When putting 1 and 2 while occurring, downlink traffic blocks.It is analyzed as follows：

1. uplink traffic：After flow goes upward to complex building metropolitan area L2/L3, because the active and standby Tunnel to complex building metropolitan area L3 is equal Failure, complex building metropolitan area L2/L3 occur VPN FRR and switch, and going upward to two hinges by two hinge metropolitan area L3 saves dry two hinge L3, passes It send to EPC, flow is normal.

2. downlink traffic：Flow comes downwards to main complex building and saves dry L3 queries static routing tables discovery to the complex building metropolitan area roads L3 By normal, flow can come downwards to complex building metropolitan area L3, and complex building metropolitan area L3 queries static routing tables, primary next-hop are comprehensive Building metropolitan area L2/L3, spare next-hop are two hinge metropolitan area L3, due to link 1 and 2 equal failures, so complex building metropolitan area L3 is to comprehensive The metropolitan areas He Lou L2/L3 and the two hinge metropolitan area tunnels L2/L3 cause the next-hop of complex building metropolitan area L3 unreachable to interrupt, and cause Downlink traffic blocks.

3. link failure reason：The reason of 3 simultaneous faults of link 2 and link, it may be possible to 3 same veneer of link 2 and link, or Person's transmission causes with routing, it is also possible to which failure superposition causes at two.

The joint-action mechanism for lacking static state L3VPN and Native IP static routing, when static L3VPN routings are unreachable, Native IP static routing will not perceive, otherwise Native IP static routing will not perceive static L3VPN routings.Through dividing It analyses, 3 kinds of scenes can cause business to hinder due to a lack of the joint-action mechanism of static L3VPN and Native IP static routing shown in table 1 It is disconnected, i.e., it can cause to transmit S1 interface business blocking of the net loaded base stations districts and cities eNodeB to EPC core nets.

Typical fault scene existing for 1 LTE PTN transmission nets of table

The limitation of the networking model and guard method now netted result in static routing networking there is a problem of it is above-mentioned, and by It is limited to PTN network element performances, PTN network elements do not have dynamic routing networking capability.Therefore, transmission net LTE PTN core layers are badly in need of one The joint-action mechanism of kind static state L3VPN and Native IP static routing.

2, lack and be effectively protected optimization method：

Equipment component version core layer L2/L3 equipment only supports one between L3 equipment, active and standby L3 equipment in now netting 10GE GE links dock, and when across office location docking is carried on a set of wave transmission system, and when PTN is carried on wavelength-division system It is single-stranded unprotect bearing mode.Can it cause when PTN device failure, OTN equipment/link failure or bottom Cable's Fault The PTN link downs of layer, when LTE PTN core layers have failure at two, Metropolitan Area Network (MAN) LTE business will block.Current PTN nets Network is limited to PTN device version, OTN radio frequency channels protection investment and networking scale, can not efficiently use existing PTN multilinks or more Wavelength-division system is protected.

Simultaneously currently without it is effective, explicitly protect optimization method, only rely at discovery one at failure timely processing one, It utmostly reduces failure twice and goes out point failure overlap period.

Invention content

In view of the drawbacks of the prior art, the present invention provides a kind of LTE PTN transmission nets and its static routing guard method, It can solve the joint-action mechanism for lacking static L3VPN and Native IP static routing in the prior art and shortage is effectively protected The problem of optimization method.

In a first aspect, the present invention provides a kind of LTE PTN transmission nets static routing guard method, the method includes：

When being pre-configured with portion between the first primary edge router PE nodes and the second primary PE nodes in LTE PTN transmission nets When the multisection type Peer BFD of administration detect that IP is unreachable, the corresponding routing of the described first primary PE nodes of judgement is unreachable；Institute It states and is connected with the primary PE nodes of third between the first primary PE nodes and the second primary PE nodes；

Control the physical interface shutdown that the Peer BFD are linked；The physical interface is the described first primary PE nodes To the physical interface of the link of the primary PE nodes of the third；

Control the described first primary PE nodes activation IP/VPN mixing FRR routings.

Optionally, described when the first primary edge router PE nodes and the second primary PE nodes in LTE PTN transmission nets Between when being pre-configured with the multisection type Peer BFD of deployment and detecting that IP is unreachable, the corresponding road of the described first primary PE nodes of judgement Before unreachable, the method further includes：

Pass through physical interface or logic interfacing and the second primary PE nodes on the described first primary PE nodes Loopback loopback interface IP establishes Peer BFD, and configure BFD link the described first primary PE nodes physical interface end Mouth state.

Optionally, described to pass through physical interface or logic interfacing and second master on the described first primary PE nodes Peer BFD are established with the loopback loopback interface IP of PE nodes, including：

In the described first primary PE nodes to the primary PE nodes of the third industry is established between the described second primary PE nodes Be engaged in multisection type Peer BFD；

In the described first primary PE nodes to the primary PE nodes of the third to foundation pipe between the described second primary PE nodes Manage multisection type Peer BFD.

Optionally, described to pass through physical interface or logic interfacing and second master on the described first primary PE nodes Peer BFD are established with the loopback loopback interface IP of PE nodes, and are configured BFD and linked the objects of the described first primary PE nodes The port status of interface is managed, including：

The Loopback 0 done in L3 equipment by downstream physical interface and complex building metropolitan area L2/L3 equipment is saved in complex building Interface IP establishes Peer BFD, and configures BFD and link the comprehensive port status for saving the downstream physical interface for doing L3 equipment； And/or

The Loopback for doing core L3 equipment is saved by upstream physical interface and complex building in complex building metropolitan area L3 equipment 0 interface IP establishes Peer BFD, and configure BFD link the complex building metropolitan area L3 equipment upstream physical interface port shape State；And/or

The 0 interface IP foundation of Loopback for doing L3 equipment is saved by downstream physical interface and complex building on core net EPC Peer BFD, and configure BFD link the EPC downstream physical interface port status.

Optionally, described when the first primary edge router PE nodes and the second primary PE nodes in LTE PTN transmission nets Between when being pre-configured with the multisection type Peer BFD of deployment and detecting that IP is unreachable, the corresponding road of the described first primary PE nodes of judgement By unreachable, including：

When the dry L3 equipment of complex building province and the complex building metropolitan area L2/L3 equipment rooms are pre-configured with the Peer of deployment When BFD detects that IP is unreachable, it is unreachable to judge that the complex building saves the corresponding routing of dry L3 equipment；

Correspondingly, the physical interface shutdown that the control Peer BFD are linked, including：

The downstream physical interface that the complex building that the Peer BFD are linked saves dry L3 equipment sets DOWN, so that described Complex building saves the downlink primary route for doing L3 equipment to complex building metropolitan area L3 equipment and cancels；

Correspondingly, the described first primary PE nodes activation IP/VPN mixing FRR routings of the control, including：

The complex building, which saves, does L3 device activation IP/VPN mixing FRR routings so that the complex building, which saves, does L3 equipment Next-hop is directed toward two hinges and saves dry L3 equipment.

When the complex building metropolitan area L3 equipment and the complex building save the Peer for doing core L3 equipment rooms and being pre-configured with deployment When BFD detects that IP is unreachable, judge that the corresponding routing of the complex building metropolitan area L3 equipment is unreachable；

The upstream physical interface for the complex building metropolitan area L3 equipment that the Peer BFD are linked sets DOWN, so that described Complex building metropolitan area L3 equipment to complex building saves the uplink primary route revocation for doing L3 equipment；

The complex building metropolitan area L3 device activation IP/VPN mixing FRR routings so that the complex building metropolitan area L3 equipment Next-hop is directed toward two hinge metropolitan area L3 equipment.

Detect that IP is unreachable when the EPC saves the PeerBFD that dry L3 equipment rooms are pre-configured with deployment with the complex building When, judge that the corresponding routings of the EPC are unreachable；

The downstream physical interface for the EPC that the Peer BFD are linked sets DOWN, so that the EPC is to the synthesis Lou Sheng does the downlink primary route revocation of core L3 equipment；

The EPC activation IP/VPN mixing FRR routings so that the next-hop of the EPC is directed toward two hinges and saves dry core L3 Equipment.

Optionally, the method further includes：

When multiprotocol label switching operation management maintainance MPLS OAM and multiprotocol label switching transmission apply MPLS-TP OAM detects that the complex building saves the fault recovery for doing L3 equipment and complex building metropolitan area L2/L3 equipment rooms tunnel, judges institute State tunnel connection；

The complex building, which saves, does the Peer BFD that L3 equipment is pre-configured with deployment with the complex building metropolitan area L2/L3 equipment rooms It detects that IP is reachable, then judges that the complex building saves the corresponding routing of dry L3 equipment and becomes reachable from unreachable；

The complex building, which saves, to be done L3 equipment triggering VPN FRR and protects switchback so that the complex building, which saves, does L3 equipment to comprehensive The downlink primary route of the metropolitan areas He Lou L3 equipment restores.

Optionally, the method further includes：

Core is done when MPLS OAM and MPLS-TP OAM detect that the complex building metropolitan area L3 equipment is saved with the complex building The fault recovery in L3 equipment rooms tunnel judges the tunnel connection；

The complex building metropolitan area L3 equipment saves the Peer for doing core L3 equipment rooms and being pre-configured with deployment with the complex building BFD detects that IP is reachable, then judges that the corresponding routing of the complex building metropolitan area L3 equipment becomes reachable from unreachable；

Complex building metropolitan area L3 equipment triggering VPN FRR protect switchback so that the complex building metropolitan area L3 equipment is to comprehensive He Lou saves the uplink primary route recovery for doing L3 equipment.

Optionally, the method further includes：

When MPLS OAM and MPLS-TP OAM detect that the EPC and the complex building save the event in dry L3 equipment rooms tunnel Barrier restores, and judges the tunnel connection；

The EPC saves the Peer BFD that dry L3 equipment rooms are pre-configured with deployment with the complex building and detects that IP is reachable, then Judge that the corresponding routings of the EPC become reachable from unreachable；

The EPC triggering VPN FRR protect switchback so that the EPC to complex building saves the downlink master for doing core L3 equipment Use route recovery.

Second aspect, the present invention provides a kind of LTE PTN transmission nets, including：It is set by complex building metropolitan area L2/L3 is primary Standby, complex building metropolitan area L3 host apparatus, two hinge metropolitan area L2/L3 stand-by equipments, two hinge metropolitan area L3 stand-by equipment networkings are formed Metropolitan area PTN network, saved by complex building do L3 host apparatus, complex building save do core L3 host apparatus, two hinges save that do L3 standby The dry PTN network of province and core net EPC for doing that core L3 stand-by equipment networkings are formed are saved with equipment, two hinges；

Wherein, the complex building saves dry configuration section between L3 host apparatus and the complex building metropolitan area L2/L3 host apparatus There are a multisection type Peer BFD in administration, and configures the BFD complex buildings that link and save the port of the downstream physical interface for doing L3 host apparatus State；When detecting BFD failures, the complex building of BFD linkages saves the downstream physical interface shutdown for doing L3 host apparatus, and Activate IP/VPN mixing FRR routings；

The complex building metropolitan area L3 host apparatus and the complex building are configured with multistage between saving dry core L3 host apparatus Formula Peer BFD, and configure BFD link the complex building metropolitan area L3 equipment upstream physical interface port status；When detecting When BFD failures, the upstream physical interface shutdown of the complex building metropolitan area L3 equipment of BFD linkages, and activate IP/VPN mixing FRR Routing；

The complex building, which saves to do, is configured with multisection type PeerBFD between L3 host apparatus and the EPC, and configures BFD connection Move the port status of the downstream physical interface of the EPC；When detecting BFD failures, the downlink object of the EPC of BFD linkages Interface shutdown is managed, and activates IP/VPN mixing FRR routings.

As shown from the above technical solution, the present invention provides a kind of LTE PTN transmission nets and its static routing guard method, When the multistage for being pre-configured with deployment in LTE PTN transmission nets between the first primary edge router PE nodes and the second primary PE nodes When formula Peer BFD detect that IP is unreachable, the corresponding routing of the described first primary PE nodes of judgement is unreachable, controls institute at this time The physical interface shutdown that Peer BFD are linked is stated, so that master of the first primary PE nodes to the primary PE nodes of the third Use route withdraw；And IP/VPN mixing FRR is activated to route so that the next-hop of the first primary PE nodes is directed toward described first The corresponding spare PE nodes of primary PE nodes.In this way, the present invention monitors the multiple spot event of router in real time by disposing multisection type BFD Hinder scene, realizes the joint-action mechanism of static L3VPN routing and Native IP static routing so that occur many places in PTN network Failure can quickly meet an urgent need when unreachable to IP routings and switch, and realize the multipoint fault scene in LTE PTN transmission nets Protection greatly reduces LTE the whole networks and blocks probability, improves internet security, promotes user's perception.

Description of the drawings

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with Other attached drawings are obtained according to these figures.

Fig. 1 is existing TD-LTE passback net networkings and protection model schematic；

Fig. 2 is the fault point schematic diagram for the LTE PTN transmission nets that one embodiment of the invention provides；

Fig. 3 is the LTE PTN core layer two points fault schematic diagram of a scenario for the transmission net that one embodiment of the invention provides；

Fig. 4 is a kind of flow signal for LTE PTN transmission nets static routing guard method that one embodiment of the invention provides Figure；

Fig. 5 is showing for the transmission net LTE PTN core layer two points fault scene reset modes that one embodiment of the invention provides It is intended to；

Fig. 6 is that a kind of flow for LTE PTN transmission nets static routing guard method that another embodiment of the present invention provides is shown It is intended to；

Fig. 7 is the schematic diagram of the transmission net LTE PTN business L3VPN that another embodiment of the present invention provides and management L3VPN；

Fig. 8 is that a kind of flow for LTE PTN transmission nets static routing guard method that another embodiment of the present invention provides is shown It is intended to；

Fig. 9 is that a kind of flow for LTE PTN transmission nets static routing guard method that another embodiment of the present invention provides is shown It is intended to；

Figure 10 is that a kind of flow for LTE PTN transmission nets static routing guard method that another embodiment of the present invention provides is shown It is intended to.

Specific implementation mode

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

Fig. 4 is a kind of flow diagram of LTE PTN transmission nets static routing guard method in one embodiment of the invention, As shown in figure 4, described method includes following steps：

S1：When matching in advance between the first primary edge router PE nodes and the second primary PE nodes in LTE PTN transmission nets When setting the multisection type Peer BFD of deployment and detecting that IP is unreachable, the corresponding routing of the described first primary PE nodes of judgement can not It reaches.

Wherein, the primary PE nodes of third are connected between the described first primary PE nodes and the second primary PE nodes. In the present embodiment, service traffics are by the first primary PE node-node transmissions to the primary PE nodes of third, by the primary PE node-node transmissions of third To the second primary PE nodes.

Specifically, three kinds of typical two points fault scenes existing for LTE PTN transmission nets as shown in Table 1：As shown in Fig. 2, The scene of 2 simultaneous faults of respective links 1 and link saves in complex building and does L3 equipment (the first primary PE nodes) and complex building metropolitan area Multisection type Peer BFD are established between L2/L3 equipment (the second primary PE nodes), are connected with complex building metropolitan area L3 equipment between the two (the primary PE nodes of third)；The scene of 5 simultaneous faults of respective links 4 and link, L3 equipment (the first primary PE in complex building metropolitan area Node) complex building save do core L3 equipment (the second primary PE nodes) between establish multisection type Peer BFD, connect between the two There is complex building to save and does L3 equipment (the primary PE nodes of third)；The scene of 6 simultaneous faults of respective links 5 and link, in EPC (first Primary PE nodes) complex building save do L3 equipment (the second primary PE nodes) between establish multisection type Peer BFD, connect between the two It is connected to complex building and saves dry core L3 equipment (the primary PE nodes of third).

Configuration is deployed with multisection type Peer BFD between the first primary PE nodes and the second primary PE nodes, when When BFD checks BFD failures by BFD hello packets, that is, when detecting that IP is unreachable, the described first primary PE is judged at this time Node is unreachable to the routing between the second primary PE nodes.

S2：Control the physical interface shutdown that the Peer BFD are linked；The physical interface is the described first primary PE Node to the link of the primary PE nodes of the third physical interface.

Specifically, as the multisection type Peer BFD for configuring deployment between the first primary PE nodes and the second primary PE nodes When detecting BFD failures, BFD DOWN states are reported to alert, the physical interface (uplink for the first primary PE nodes that BFD is linked Physical interface or downstream physical interface) while setting DOWN, that is, close the physical interface so that the first primary PE nodes to third The primary route (uplink primary route or downlink primary route) of primary PE nodes is revoked.

S3：Control the described first primary PE nodes activation IP/VPN mixing FRR routings.

Specifically, the first primary PE nodes to the primary PE nodes of third primary route (uplink primary route or downlink Primary route) be revoked after, IP/VPN mixing FRR routing is activated at the first primary PE nodes, that is, triggers the first primary PE and saves The VPN FRR of point are switched so that it is corresponding standby that the next-hop of the first primary PE nodes is directed toward the first primary PE nodes With PE nodes so that flow can be forwarded normally.

Specifically, typical two points fault scene existing for LTE PTN transmission nets shown in table 1, is in the static domains L3VPN Between primary PE nodes unreachable (such as Fig. 3 transmission nets are route between primary PE in domain caused by active and standby tunnel (Tunnel) failure The scene of LTE PTN 2 simultaneous faults of core layer).When this kind of fault scenes occur, LTE base station business can block.At this point, It needs to start quick emergency recovery means.Difficulty in solving this problem is that lacking static state L3VPN and Native IP static state road By joint-action mechanism.Firstly the need of the condition for judging that emergency recovery starts, the means for quickly executing emergency recovery are secondly needed.

1, the judgement of emergency recovery entry condition：

The Rule of judgment of such fault scenes emergency recovery is active and standby Tunnel events between primary PE nodes in the domains L3VPN Route between PE in domain caused by barrier it is unreachable (such as：2 failure of link 1 and link).Because being only configured with one between PE nodes in L3VPN Routing, and be static, which is carried on Tunnel, and Tunnel uses 1:1 protected mode, i.e., as the master between PE nodes It is route between PE when standby Tunnel simultaneous faults unreachable.So can be there are two types of judgment mode, the first is that direct detection is static It route unreachable, is for second that the active and standby Tunnel of detection is unreachable.The embodiment of the present invention uses first way.

2, the execution of emergency recovery action：

When routeing unreachable between PE in the domain caused by the active and standby equal failures of Tunnel between primary PE nodes in the domains L3VPN, it is It can timely restore failure, need to execute the recovery action responded.With the 2 points of events simultaneously of Fig. 3 transmission net LTE PTN core layers , can be with disconnecting link 3 when emergency recovery for the scene of barrier, complex building, which saves, at this time does L3 and will activate BK Next-hop, road Two hinges are changed to by next-hop and save dry L3, saving dry L3 by two hinges send to two hinge metropolitan area L3, and then is forwarded to complex building city Domain L2/L3, business recovery.And the most easily and efficiently mode is comprehensive in the dry L3 equipment closing second line of a couplet of complex building province to disconnecting link 3 The port of the metropolitan areas He Lou L3 equipment.

3, the linkage of fault detect and emergency recovery action

Emergency recovery entry condition and emergency recovery action in 1 and 2 are independent, lack joint-action mechanism.In existing net When encountering fault scenes shown in Fig. 3, processing procedure is that the ping test of segmented is carried out first on webmaster, former when testing out Barrier is the reason is that when unreachable complex building metropolitan area L3 to complex building metropolitan area L2/L3 routings, by hand in the port of the enterprising line link of webmaster 3 Close, as shown in figure 5, but the fault detect and emergency recovery operating time it is long, influence user perception.

Based on this, the present invention proposes a kind of based on multisection type BFD realization LTE PTN transmission net static routing protection side Method realizes the joint-action mechanism of emergency recovery entry condition and emergency recovery action by disposing multisection type BFD.For example, such as Shown in Fig. 5, is saved in complex building and do L3 and complex building metropolitan area L2/L3 equipment rooms configuration deployment Peer BFD, specifically in complex building Save the 0 interface IP foundation of Loopback for doing physical interface and complex building metropolitan area L2/L3 equipment on L3 by second line of a couplet link 3 Peer BFD, and the port status that BFD linkage complex buildings save the physical interface for the second line of a couplet link 3 for doing L3 is configured, when BFD passes through When BFD hello packet checks BFD failures, BFD DOWN states is reported to alert, the complex building that BFD is linked, which saves, does L3 downlinks Physical interface sets DOWN simultaneously so that and complex building saves the downlink primary route revocation for doing L3, and activation IP/VPN mixing FRR is route, Next-hop is directed toward two hinges and saves dry L3 equipment so that downlink traffic normally forwards.

It should be noted that when complex building saves and does L3 to complex building metropolitan area L3 link failures, Peer BFD can also be detected To failure, Peer BFD can set DOWN, and complex building, which saves, to be done L3 downstream interfaces and can also set down, but complex building metropolitan area L2/L3 0 interfaces of Loopback will not set DOWN, because 0 interfaces of Loopback belong to the logic interfacing of equipment, as long as equipment has 1 object Manage interface UP, logic interfacing will UP, so deserve complex building save do L3 to complex building metropolitan area L3 link failures when, the present embodiment In the guard method there will not be ambiguity.

Equally, it is not by link 1 and 2 when complex building metropolitan area L3 to complex building metropolitan area L2/L3 links is route unreachable Failure causes, but due in Fig. 51 and 11 link failures cause, the parallel link failure of business, the network can not be protected at this time, It is meaningless whether complex building province sets DOWN in the dry ports L3.When complex building metropolitan area L3 to complex building metropolitan area L2/L3 links is route not It is reachable, it is since in Fig. 51 and 22 link failures cause, LTE business is normal at this time, and complex building, which saves, does whether the ports L3 set DOWN Business is not influenced.

So one kind that the present embodiment proposes, which is based on multisection type BFD, realizes LTE PTN transmission net static routing guard methods, The effect that linkage protection and emergency recovery can be started to scene shown in Fig. 3, realizes the automatic protection switching of flow.

In the present embodiment, when the first primary edge router PE nodes in LTE PTN transmission nets and the second primary PE nodes Between when being pre-configured with the multisection type Peer BFD of deployment and detecting that IP is unreachable, the corresponding road of the described first primary PE nodes of judgement By unreachable, the physical interface shutdown that the Peer BFD are linked is controlled at this time, so that the first primary PE nodes are to institute State the primary route revocation of the primary PE nodes of third；And IP/VPN mixing FRR is activated to route so that the first primary PE nodes Next-hop be directed toward the corresponding spare PE nodes of the first primary PE nodes.In this way, the present embodiment is by disposing multisection type BFD The multipoint fault scene for monitoring router in real time realizes the gear of static L3VPN routing and Native IP static routing System so that occur quickly meeting an urgent need when many places failure is unreachable to IP routings in PTN network and switch, realize LTE PTN The protection of multipoint fault scene in transmission net greatly reduces LTE the whole networks and blocks probability, improve internet security, promoted User perceives.

Fig. 6 is that a kind of flow for LTE PTN transmission nets static routing guard method that another embodiment of the present invention provides is shown It is intended to, as shown in fig. 6, before above-mentioned steps S1, the method further includes following steps：

S0：Pass through physical interface or logic interfacing and the second primary PE nodes on the described first primary PE nodes Loopback loopback interface IP establish Peer BFD, and configure BFD and link the physical interfaces of the described first primary PE nodes Port status.

Specifically, the step S0, including：

In the described first primary PE nodes to the primary PE nodes of the third industry is established between the described second primary PE nodes Be engaged in multisection type Peer BFD；In the described first primary PE nodes to the primary PE nodes of the third to the described second primary PE nodes Between establish management multisection type PeerBFD.

Specifically, the working mechanism of BFD is as follows：

BFD (Bidirectional Forwarding Detection) two-way converting detects, and is that a kind of link failure is fast Fast testing mechanism is detected all types of media, protocol layer using single mechanism, can be between adjacent forwarding engine Path provide light load, short duration detection.

The testing mechanism of BFD is that two systems establish BFD sessions, and are controlled along the path periodicity sending BFD between them Message processed a, if side does not receive BFD control messages within the set time, then it is assumed that failure has occurred on path.

BFD control messages, which are encapsulated in UDP messages, to be transmitted.Session start stage, both sides' system are taken by controlling in message The parameter (Session ID, desired transmitting-receiving message minimum interval, local terminal BFD session status etc.) of band is held consultation.Association After quotient's success, message is controlled periodically to send BFD on the path of the packet sending and receiving time of negotiation between each other.

To meet the needs of quickly detecting, it is microsecond that BFD draft regulations, which send interval and receive spacer unit,.But it is limited to mesh Preceding equipment disposal ability, when device configuration BFD of most of manufacturer, can only achieve Millisecond, turn again when carrying out inter-process Microsecond is changed to, the minimum detection time that PTN device is supported is 3 milliseconds.

Start BFD, referred to as Peer BFD between two routers, for the link failure between detection device.BFD With For static routing characteristics, BFD sessions can be utilized to detect to public network IP v4 static routing state and VPN static routing shapes State is detected.Route management system determines whether static routing can be used according to the state of BFD sessions.

Peer BFD support configuration track-interface to specify the function of linkage interface.When BFD detects failure, The Interface status in Port State Table PST (Port State Table) is changed, if Interface status Down, can link BFD Session Down, and then opposite end perceives interface fault, triggers preset emergent switching action.

BFD accords with (Remote using local identifier (Local Discriminator) and distal marker Discriminator it) distinguishes with multiple BFD sessions between a pair of of system.It is created according to local identifier and distal marker symbol The difference of mode is distinguished, the static BFD sessions of manual specified identifier.

Further, the configuration process of BFD is as follows：

Specifically, bfd bind peer-ip orders are used for creating BFD binding sessions, and generate BFD sessions.Detailed orders As follows, parameter declaration is shown in Table 2：

bfd bfd-name bind peer-ip peer-ip[vpn-instance vpn-instance-name]

[source-ip source-ip][track-interface{interface interface-type2 interface-number2|controller interf ace-type2 interface-number2}]

2 Peer BFD configuration order parameter declarations of table

Further, for multisection type BFD configurations in LTE PTN transmission networks：

Two IP address are distributed in each base stations TD-LTE in now netting, and are respectively used to webmaster OM and business (S1/X2), and two IP address belongs to the different network segments.Two isolation static state L3VPN, i.e. business L3VPN and management L3VPN are typically set up, in metropolitan area Different sub-interface docking is respectively adopted in L3VPN and districts and cities L3VPN when docking.Such as Fig. 7 transmission net LTE PTN business L3VPN and It manages shown in L3VPN schematic diagrames.

It because of business and manages mutually isolated, in two static state L3VPN, therefore when establishing multisection type Peer BFD, needs Establishing two Peer BFD.By taking complex building saves dry Peer BFD between L3 equipment and complex building metropolitan area L2/L3 as an example, LTE PTN transmission net Peer BFD parameter declaration core parameters are shown in Table 3, and other common parameters omit herein.

3 LTE PTN transmission net Peer BFD parameter declarations of table

Configuration meets the IP static routing of BFD intercommunications, and path is in strict accordance with complex building metropolitan area L2/L3 to complex building metropolitan area L3 It is saved to complex building and does L3.When by complex building metropolitan area L2/L3 to complex building metropolitan area L3, two layers are walked Tunnel 1:1 channel so that road Active and standby tunnel failures can be detected by detection simultaneously, complex building metropolitan area L3 to complex building saves dry L3 and walks Native IP static state road By.

Further, the deployment way of the PeerBFD of the fault scenes 2 and fault scenes 3 in table 1 can be derived such as Shown in the following table 4：

The deployment way of the Peer BFD of 4 fault scenes 2 and 3 of table

Specifically, the step S0 specifically includes following three kinds of situations：

1, the Loopback done in L3 equipment by downstream physical interface and complex building metropolitan area L2/L3 equipment is saved in complex building 0 interface IP establishes Peer BFD, and configures BFD and link the comprehensive port status for saving the downstream physical interface for doing L3 equipment； And/or

2, it is saved by upstream physical interface and complex building in complex building metropolitan area L3 equipment and does core L3 equipment 0 interface IP of Loopback establish Peer BFD, and configure BFD and link the upstream physical interface of the complex building metropolitan area L3 equipment Port status；And/or

3, the 0 interface IP of Loopback for saving dry L3 equipment by downstream physical interface and complex building on core net EPC are built Vertical Peer BFD, and configure BFD link the EPC downstream physical interface port status.

A kind of LTE PTN transmission net static routing guard methods based on multisection type BFD are provided in the present embodiment, to existing Guard method is proposed under 3 kinds of fault scenes of net, can realize that flow automatically switches, LTE business does not block.When PTN network event When barrier point is eliminated, flow can switchback be to the PTN service paths worked normally automatically, to improve the stalwartness of LTE PTN transmission nets Property.

Further, it for 3 kinds of typical fault scenes in table 1, present embodiments provides network and switches algorithm.

Specifically, for the typical fault scene 1 in table 1, LTE PTN transmission net static routing as shown in Figure 8 protection Method specifically comprises the following steps：

S801：When the complex building saves dry L3 equipment deployment is pre-configured with the complex building metropolitan area L2/L3 equipment rooms When Peer BFD detect that IP is unreachable, it is unreachable to judge that the complex building saves the corresponding routing of dry L3 equipment.

Specifically, as shown in figure 8, doing L3 equipment and the complex building metropolitan area L2/L3 equipment rooms when the complex building saves When being pre-configured with the Peer BFD of deployment and detecting that IP is unreachable, i.e., failure generates, then goes to step S802.

S802：The downstream physical interface that the complex building that the Peer BFD are linked saves dry L3 equipment sets DOWN.

Specifically, the downstream physical interface that the complex building that the Peer BFD are linked saves dry L3 equipment is set DOWN closes the downstream physical interface, so that the complex building, which saves, does L3 equipment to the downlink master of complex building metropolitan area L3 equipment Use route withdraw.If the downstream physical interface that the complex building that the Peer BFD are linked saves dry L3 equipment is not set DOWN then goes to step S801.

S803：If the complex building saves the downlink primary route for doing L3 equipment to complex building metropolitan area L3 equipment and cancels, turn To step S804, step S801 is all then gone to.

S804：The complex building, which saves, does L3 device activation IP/VPN mixing FRR routings so that the complex building saves dry L3 and sets Standby next-hop is directed toward two hinges and saves dry L3 equipment.

Specifically, as shown in figure 8, the VPN FRR of the i.e. dry L3 equipment of triggering complex building province are switched, complex building province does L3 and sets Standby next-hop is directed toward two hinges and saves dry L3 equipment so that downlink traffic normally forwards.

Further, for the typical fault scene 1 in table 1, when failure vanishes, as shown in figure 8, the method is also wrapped It includes：

S805：When multiprotocol label switching operation management maintainance MPLS OAM and multiprotocol label switching transmission application MPLS-TP OAM detect that the complex building saves dry L3 equipment and the failure in complex building metropolitan area L2/L3 equipment rooms tunnel is extensive It is multiple, judge the tunnel connection.

It should be noted that if judgement complex building saves and does L3 equipment and complex building metropolitan area L2/L3 equipment rooms tunnel not Connection, then go to step S801.

S806：The complex building saves dry L3 equipment and is pre-configured with deployment with the complex building metropolitan area L2/L3 equipment rooms Peer BFD detect that IP is reachable, then judge that the complex building saves the corresponding routing of dry L3 equipment and becomes reachable from unreachable.

S807：The complex building, which saves, does L3 equipment triggering VPN FRR protection switchbacks so that the complex building, which saves, does L3 equipment Downlink primary route to complex building metropolitan area L3 equipment restores.

Specifically, original route or former routing are available at this time, and triggering VPN FRR protection switchings, business is returned to former flow Model.

Specifically, for the typical fault scene 2 in table 1, LTE PTN transmission net static routing as shown in Figure 9 protection Method specifically comprises the following steps：

S901：It is pre-configured with deployment when the complex building metropolitan area L3 equipment and the complex building save dry core L3 equipment rooms When Peer BFD detect that IP is unreachable, judge that the corresponding routing of the complex building metropolitan area L3 equipment is unreachable.

S902：The upstream physical interface for the complex building metropolitan area L3 equipment that the Peer BFD are linked sets DOWN.

Specifically, the upstream physical interface for the complex building metropolitan area L3 equipment that the Peer BFD are linked sets DOWN, So that the complex building metropolitan area L3 equipment to complex building saves the uplink primary route revocation for doing L3 equipment.

S903：If the complex building metropolitan area L3 equipment to complex building saves the uplink primary route revocation for doing L3 equipment, turn To step S904, step S901 is otherwise gone to.

S904：The complex building metropolitan area L3 device activation IP/VPN mixing FRR routings so that the complex building metropolitan area L3 is set Standby next-hop is directed toward two hinge metropolitan area L3 equipment.

Specifically, as shown in figure 9, the VPN FRR of i.e. triggering complex building metropolitan area L3 equipment are switched, complex building metropolitan area L3 is set Standby next-hop is directed toward two hinge metropolitan area L3 equipment so that uplink traffic normally forwards.

Further, for the typical fault scene 2 in table 1, when failure vanishes, as shown in figure 9, the method is also wrapped It includes：

S905：When MPLS OAM and MPLS-TP OAM detect that the complex building metropolitan area L3 equipment is saved with the complex building The fault recovery in dry core L3 equipment rooms tunnel judges the tunnel connection.

S906：The complex building metropolitan area L3 equipment saves dry core L3 equipment rooms with the complex building and is pre-configured with deployment Peer BFD detect that IP is reachable, then judge that the corresponding routing of the complex building metropolitan area L3 equipment becomes reachable from unreachable.

S907：The complex building metropolitan area L3 equipment triggering VPN FRR protect switchback so that the complex building metropolitan area L3 equipment The uplink primary route recovery for doing L3 equipment is saved to complex building.

Specifically, for the typical fault scene 3 in table 1, LTE PTN transmission net static routing as shown in Figure 10 protection Method specifically comprises the following steps：

S1001：IP is detected when the EPC and the complex building save the Peer BFD that dry L3 equipment rooms are pre-configured with deployment When unreachable, judge that the corresponding routings of the EPC are unreachable.

S1002：The downstream physical interface for the EPC that the Peer BFD are linked sets DOWN.

Specifically, the downstream physical interface for the EPC that the Peer BFD are linked sets DOWN, so that the EPC is extremely The complex building saves the downlink primary route revocation for doing core L3 equipment.

S1003：If the EPC saves the downlink primary route revocation for doing core L3 equipment to the complex building, step is gone to Otherwise rapid S1004 goes to step S1001.

S1004：The EPC activation IP/VPN mixing FRR routings so that it is dry that the next-hop of the EPC is directed toward two hinges province Core L3 equipment.

Specifically, as shown in Figure 10, i.e. the VPN FRR of triggering EPC are switched, and the next-hop of EPC is directed toward two hinges province and is done Core L3 equipment so that downlink traffic normally forwards.

Further, for the typical fault scene 3 in table 1, when failure vanishes, as shown in Figure 10, the method is also Including：

S1005：L3 equipment room tunnels are done when MPLS OAM and MPLS-TP OAM detect that the EPC is saved with the complex building The fault recovery in road judges the tunnel connection.

S1006：The EPC saves the Peer BFD that dry L3 equipment rooms are pre-configured with deployment with the complex building and detects that IP can It reaches, then judges that the corresponding routings of the EPC become reachable from unreachable.

S1007：The EPC triggering VPN FRR protect switchback so that the EPC to complex building, which is saved, does core L3 equipment Downlink primary route restores.

A kind of LTE PTN transmission net static routing guard methods based on multisection type BFD provided in this embodiment, by building The linkage guard method of vertical static state L3VPN and Native IP static routing, solves Metropolitan Area Network (MAN) under 3 kinds of double breaking points fault scenes The problem of flow of LTE PTN carryings blocks, pretection switch is simple and quick effectively.The present embodiment need not show wet end administration hardware and visit Needle is only software configuration operation, saves maintenance cost, reduces base station and blocks probability, improves user's perception.

One embodiment of the invention provides a kind of LTE PTN transmission nets, as shown in Fig. 2, the LTE PTN transmission net packets It includes：By complex building metropolitan area L2/L3 host apparatus, complex building metropolitan area L3 host apparatus, two hinge metropolitan area L2/L3 stand-by equipments, two The metropolitan area PTN network of hinge metropolitan area L3 stand-by equipment networkings formation is saved by complex building and does L3 host apparatus, the dry core of complex building province L3 host apparatus, two hinges save and do L3 stand-by equipments, two hinges save the province that dry core L3 stand-by equipment networkings are formed and do PTN nets Network and core net EPC.

Wherein, the complex building saves dry configuration section between L3 host apparatus and the complex building metropolitan area L2/L3 host apparatus There are a multisection type Peer BFD in administration, and configures the BFD complex buildings that link and save the port of the downstream physical interface for doing L3 host apparatus State；When detecting BFD failures, the complex building of BFD linkages saves the downstream physical interface shutdown for doing L3 host apparatus, and Activate IP/VPN mixing FRR routings.

Wherein, the complex building metropolitan area L3 host apparatus and the complex building are configured between saving dry core L3 host apparatus Multisection type Peer BFD, and configure BFD link the complex building metropolitan area L3 equipment upstream physical interface port status；Work as inspection When measuring BFD failures, the upstream physical interface shutdown of the complex building metropolitan area L3 equipment of BFD linkages, and activate IP/VPN mixed Close FRR routings.

Wherein, the complex building, which saves to do, is configured with multisection type Peer BFD between L3 host apparatus and the EPC, and configures BFD link the EPC downstream physical interface port status；When detecting BFD failures, under the EPC of BFD linkages Row physical interface turns off, and activates IP/VPN mixing FRR routings.

One embodiment of the invention provides a kind of LTE PTN transmission nets static routing protection algorism, and the algorithm includes：Road By reachable Deciding Algorithm, route withdraw algorithm and rerouting algorithm, wherein：

Routing is up to Deciding Algorithm, for when the first primary edge router PE nodes in LTE PTN transmission nets and the When being pre-configured with the multisection type Peer BFD of deployment between two primary PE nodes and detecting that IP is unreachable, the first primary PE is judged The corresponding routing of node is unreachable；It is primary it to be connected with third between the first primary PE nodes and the second primary PE nodes PE nodes；Route withdraw algorithm, the physical interface shutdown to be linked for controlling the Peer BFD, so that described first is primary The primary route of PE nodes to the primary PE nodes of the third cancels；Rerouting algorithm, for activating the roads IP/VPN mixing FRR By so that the corresponding spare PE nodes of the described first primary PE nodes of next-hop direction of the first primary PE nodes.

In the present embodiment, it route reachable Deciding Algorithm first primary edge router PE sections in LTE PTN transmission nets When being pre-configured with the multisection type PeerBFD of deployment between point and the second primary PE nodes and detecting that IP is unreachable, judgement described first The corresponding routing of primary PE nodes is unreachable, and route withdraw algorithm controls the physical interface that the Peer BFD are linked and closes at this time It is disconnected, so that the primary route of the first primary PE nodes to the primary PE nodes of the third cancels；Rerouting algorithm activates IP/ VPN mixing FRR routings so that it is corresponding spare that the next-hop of the first primary PE nodes is directed toward the first primary PE nodes PE nodes.In this way, the present embodiment monitors the multipoint fault scene of router in real time by disposing multisection type BFD, static state is realized L3VPN route the joint-action mechanism with Native IP static routing so that occurring many places failure in PTN network can not to IP routings Up to when can quickly meet an urgent need and switch, realize the protection of the multipoint fault scene in LTE PTN transmission nets, greatly reduce LTE the whole networks block probability, improve internet security, promote user's perception.

In an alternate embodiment of the present invention where, the algorithm further includes：BFD placement algorithms, are used for：

It is built by the logic interfacing IP of physical interface and the second primary PE nodes on the described first primary PE nodes Vertical Peer BFD, and configure BFD link the described first primary PE nodes physical interface port status.

Specifically, the BFD placement algorithms, are used for：

In an alternate embodiment of the present invention where, the BFD placement algorithms, are specifically used for：

In an alternate embodiment of the present invention where, the routing is specifically used for up to Deciding Algorithm：

When the dry L3 equipment of complex building province and the complex building metropolitan area L2/L3 equipment rooms are pre-configured with the Peer of deployment When BFD detects that IP is unreachable, it is unreachable to judge that the complex building saves the corresponding routing of dry L3 equipment.

Correspondingly, the route withdraw algorithm, is specifically used for：

The downstream physical interface that the complex building that the Peer BFD are linked saves dry L3 equipment sets DOWN, so that described Complex building saves the downlink primary route for doing L3 equipment to complex building metropolitan area L3 equipment and cancels.

Correspondingly, the rerouting algorithm, is specifically used for：

Further, the algorithm further includes：Route recovery algorithm, is specifically used for：

When the complex building metropolitan area L3 equipment and the complex building save the Peer for doing core L3 equipment rooms and being pre-configured with deployment When BFD detects that IP is unreachable, judge that the corresponding routing of the complex building metropolitan area L3 equipment is unreachable.

Correspondingly, the route withdraw algorithm, is specifically used for：

The upstream physical interface for the complex building metropolitan area L3 equipment that the Peer BFD are linked sets DOWN, so that described Complex building metropolitan area L3 equipment to complex building saves the uplink primary route revocation for doing L3 equipment.

Correspondingly, the rerouting algorithm, is specifically used for：

Detect that IP is unreachable when the EPC saves the PeerBFD that dry L3 equipment rooms are pre-configured with deployment with the complex building When, judge that the corresponding routings of the EPC are unreachable.

Correspondingly, the route withdraw algorithm, is specifically used for：

The downstream physical interface for the EPC that the Peer BFD are linked sets DOWN, so that the EPC is to the synthesis Lou Sheng does the downlink primary route revocation of core L3 equipment.

Correspondingly, the rerouting algorithm, is specifically used for：

For algorithm embodiment, since it is basically similar to the method embodiment, so description is fairly simple, it is related Place illustrates referring to the part of embodiment of the method.

One of ordinary skill in the art will appreciate that：Realize that all or part of step of above method embodiment can pass through The relevant hardware of program instruction is completed, and program above-mentioned can be stored in a computer read/write memory medium, the program When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes：ROM, RAM, magnetic disc or light The various media that can store program code such as disk.

Embodiments described above is only schematical, wherein the unit illustrated as separating component can be Or may not be and be physically separated, the component shown as unit may or may not be physical unit, i.e., A place can be located at, or may be distributed over multiple network units.It can select according to the actual needs therein Some or all of module achieves the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creative labor In the case of dynamic, you can to understand and implement.

Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can It is realized by the mode of software plus required general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on Stating technical solution, substantially the part that contributes to existing technology can be expressed in the form of software products in other words, should Computer software product can store in a computer-readable storage medium, such as ROM/RAM, magnetic disc, CD, including several fingers It enables and using so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation Method described in certain parts of example or embodiment.

It should also be noted that, herein, relational terms such as first and second and the like are used merely to one Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that There is also other identical elements in process, method, article or equipment including the element.

The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.

Claims

1. a kind of LTE PTN transmission nets static routing guard method, which is characterized in that the method includes：

When being pre-configured with deployment between the first primary edge router PE nodes and the second primary PE nodes in LTE PTN transmission nets When multisection type Peer BFD detect that IP is unreachable, the corresponding routing of the described first primary PE nodes of judgement is unreachable；Described It is connected with the primary PE nodes of third between one primary PE nodes and the second primary PE nodes；

Control the physical interface shutdown that the Peer BFD are linked；The physical interface is the described first primary PE nodes to institute State the physical interface of the link of the primary PE nodes of third；

2. according to the method described in claim 1, it is characterized in that, described when the first primary edge road in LTE PTN transmission nets When multisection type Peer BFD by being pre-configured with deployment between device PE nodes and the second primary PE nodes detect that IP is unreachable, judgement Before the corresponding routing of the first primary PE nodes is unreachable, the method further includes：

3. according to the method described in claim 2, it is characterized in that, described connect on the described first primary PE nodes by physics Mouth or the loopback loopback interface IP of logic interfacing and the second primary PE nodes establish Peer BFD, and configure BFD Link the described first primary PE nodes physical interface port status, including：

0 interfaces of Loopback done in L3 equipment by downstream physical interface and complex building metropolitan area L2/L3 equipment are saved in complex building IP establishes Peer BFD, and configures BFD and link the comprehensive port status for saving the downstream physical interface for doing L3 equipment；And/or

The Loopback 0 for saving dry core L3 equipment by upstream physical interface and complex building in complex building metropolitan area L3 equipment connects Mouthful IP establishes Peer BFD, and configure BFD link the complex building metropolitan area L3 equipment upstream physical interface port status； And/or

The 0 interface IP of Loopback that dry L3 equipment is saved by downstream physical interface and complex building on core net EPC establish Peer BFD, and configure BFD link the EPC downstream physical interface port status.

4. according to the method described in claim 3, it is characterized in that, described when the first primary edge road in LTE PTN transmission nets When multisection type Peer BFD by being pre-configured with deployment between device PE nodes and the second primary PE nodes detect that IP is unreachable, judgement The corresponding routing of the first primary PE nodes is unreachable, including：

When the Peer BFD that the dry L3 equipment of complex building province and the complex building metropolitan area L2/L3 equipment rooms are pre-configured with deployment are examined Measure IP it is unreachable when, judge that the complex building saves that do the corresponding routing of L3 equipment unreachable；

The downstream physical interface that the complex building that the Peer BFD are linked saves dry L3 equipment sets DOWN, so that the synthesis The downlink primary route that Lou Sheng does L3 equipment to complex building metropolitan area L3 equipment cancels；

The complex building, which saves, does L3 device activation IP/VPN mixing FRR routings so that the complex building, which saves, does the next of L3 equipment It jumps and is directed toward the dry L3 equipment of two hinges province.

5. according to the method described in claim 3, it is characterized in that, described when the first primary edge road in LTE PTN transmission nets When multisection type Peer BFD by being pre-configured with deployment between device PE nodes and the second primary PE nodes detect that IP is unreachable, judgement The corresponding routing of the first primary PE nodes is unreachable, including：

When the complex building metropolitan area L3 equipment and the complex building save the Peer BFD for doing core L3 equipment rooms and being pre-configured with deployment When detecting that IP is unreachable, judge that the corresponding routing of the complex building metropolitan area L3 equipment is unreachable；

The upstream physical interface for the complex building metropolitan area L3 equipment that the Peer BFD are linked sets DOWN, so that the synthesis Building metropolitan area L3 equipment to complex building saves the uplink primary route revocation for doing L3 equipment；

Complex building metropolitan area L3 device activation IP/VPN mixing FRR routing so that the complex building metropolitan area L3 equipment it is next It jumps and is directed toward two hinge metropolitan area L3 equipment.

6. according to the method described in claim 3, it is characterized in that, described when the first primary edge road in LTE PTN transmission nets When multisection type Peer BFD by being pre-configured with deployment between device PE nodes and the second primary PE nodes detect that IP is unreachable, judgement The corresponding routing of the first primary PE nodes is unreachable, including：

When the EPC and the complex building, which save the Peer BFD that dry L3 equipment rooms are pre-configured with deployment, detects that IP is unreachable, Judge that the corresponding routings of the EPC are unreachable；

The downstream physical interface for the EPC that the Peer BFD are linked sets DOWN, so that the EPC is saved to the complex building The downlink primary route revocation of dry core L3 equipment；

7. according to the method described in claim 4, it is characterized in that, the method further includes：

When multiprotocol label switching operation management maintainance MPLS OAM and multiprotocol label switching transmission are using MPLS-TP OAM inspections It measures the complex building and saves the fault recovery for doing L3 equipment and complex building metropolitan area L2/L3 equipment rooms tunnel, judge the tunnel Road is connected to；

The complex building, which saves, does the Peer BFD detections that L3 equipment is pre-configured with deployment with the complex building metropolitan area L2/L3 equipment rooms It is reachable to IP, then judge that the complex building saves the corresponding routing of dry L3 equipment and becomes reachable from unreachable；

The complex building, which saves, does L3 equipment triggering VPN FRR protection switchbacks so that the complex building, which saves, does L3 equipment to complex building The downlink primary route of metropolitan area L3 equipment restores.

8. according to the method described in claim 5, it is characterized in that, the method further includes：

When MPLS OAM and MPLS-TP OAM detect that the complex building metropolitan area L3 equipment saves dry core L3 with the complex building and sets The fault recovery in tunnel between standby judges the tunnel connection；

The complex building metropolitan area L3 equipment is saved with the complex building does the Peer BFD inspections that core L3 equipment rooms are pre-configured with deployment It is reachable to measure IP, then judges that the corresponding routing of the complex building metropolitan area L3 equipment becomes reachable from unreachable；

The complex building metropolitan area L3 equipment triggering VPN FRR protect switchback so that the complex building metropolitan area L3 equipment to complex building Save the uplink primary route recovery for doing L3 equipment.

9. according to the method described in claim 6, it is characterized in that, the method further includes：

When MPLS OAM and MPLS-TP OAM detect the EPC and the complex building save do L3 equipment rooms tunnel failure it is extensive It is multiple, judge the tunnel connection；

The EPC saves the Peer BFD that dry L3 equipment rooms are pre-configured with deployment with the complex building and detects that IP is reachable, then judges Corresponding route from unreachable of the EPC becomes reachable；

The EPC triggering VPN FRR protect switchback so that the EPC to complex building saves the primary road of downlink for doing core L3 equipment By restoring.

10. a kind of LTE PTN transmission nets, which is characterized in that including：By complex building metropolitan area L2/L3 host apparatus, complex building metropolitan area Metropolitan area PTN network that L3 host apparatus, two hinge metropolitan area L2/L3 stand-by equipments, two hinge metropolitan area L3 stand-by equipment networkings are formed, It is saved by complex building and does L3 host apparatus, complex building saves dry core L3 host apparatus, L3 stand-by equipments are done by two hinges province, two hinges save PTN network and core net EPC do in the province that dry core L3 stand-by equipment networkings are formed；

Wherein, the complex building saves dry configured between L3 host apparatus and the complex building metropolitan area L2/L3 host apparatus and is deployed with Multisection type Peer BFD, and configure the link complex buildings of BFD and save the port status of the downstream physical interface for doing L3 host apparatus； When detecting BFD failures, the complex building of BFD linkages saves the downstream physical interface shutdown for doing L3 host apparatus, and activates IP/VPN mixing FRR routings；

The complex building metropolitan area L3 host apparatus and the complex building are configured with multisection type between saving dry core L3 host apparatus Peer BFD, and configure BFD link the complex building metropolitan area L3 equipment upstream physical interface port status；When detecting When BFD failures, the upstream physical interface shutdown of the complex building metropolitan area L3 equipment of BFD linkages, and activate IP/VPN mixing FRR Routing；

The complex building, which saves to do, is configured with multisection type Peer BFD between L3 host apparatus and the EPC, and configures BFD linkages institute State the port status of the downstream physical interface of EPC；When detecting BFD failures, the downlink physical of the EPC of BFD linkages connects Mouth shutdown, and activate IP/VPN mixing FRR routings.