CN101616093B

CN101616093B - Method and device for realizing user access multi-homing network and network equipment

Info

Publication number: CN101616093B
Application number: CN2009101606145A
Authority: CN
Inventors: 陈佑建
Original assignee: Fujian Star Net Communication Co Ltd
Current assignee: Beijing Zhigu Tech Co Ltd
Priority date: 2009-07-17
Filing date: 2009-07-17
Publication date: 2011-06-22
Anticipated expiration: 2029-07-17
Also published as: CN101616093A

Abstract

The invention discloses a method and a device for realizing a user access multi-homing network and network equipment, and solves the problem of dynamic routing loops generated when a user access network uses CE multi-homing networking. The method disclosed by the invention comprises that: a home location PE receives VPN routing information from other PE; if judging that the VPN routing information received from the other PE is required to be sent to homing CE, the home location PE reflects the VPN routing information to the other PE on the home location; and when receiving the VPN routing information from the homing CE, the home location PE judges whether the VPN routing information received from the homing CE is the same as the reflected VPN routing information, and if so, VPN routing entries are prohibited from being updated by the VPN routing information received from the homing CE. Because the home location PE filters routing which is received from the CE and possibly causes loops by utilizing the reflected VPN routing information, and the VPN routing information is not used to update the VPN routing entries, so the problem of the dynamic routing loops is solved.

Description

A kind of user access multi-homing network implementation approach, device and the network equipment

Technical field

The invention belongs to network communication field, particularly a kind of user access multi-homing network implementation approach, device and the network equipment.

Background technology

MPLS VPN is a kind of based on MPLS (Multiprotocol Label Switching, the multi protocol label exchange) IP VPN (the Virtual Private Network of technology, Virtual Private Network), because characteristics such as its networking mode is flexible, extensibility is good are extended towards application more and more widely.CE (Custom Edge, customer access equipment), PE (Provider Edge Router, provider's edge router) and three kinds of network equipments of P (Provider Router, provider's core router) are arranged in MPLSVPN.VPN routing iinformation based on IPv4 is by between PE and the PE, route switching between CE and the PE is finished: PE and CE can be by static state or dynamic routing protocol exchanging routing informations: safeguard VPN VPN route Table V RF (VPN Routing/Forwarding Instance on the PE, routing transmitting example), and enclose RD (Route Distinguisher for each bar VPN route, route-distinguisher) and RT (RouteTarget, route target) etc. after attribute is converted into the VPNv4 route, again by MP-BGP (MultiprotocolBorder Gateway Protocol, support the Border Gateway Protocol of multi-protocols expansion) routing iinformation issue all PE neighbours (when PE equipment more for a long time, can adopt bgp router reflector networking reflection VPNv4 route); PE joins the VPNv4 route among the corresponding VRF according to the RT attributes match of local VRF, introduces and be transmitted to corresponding C E by the Routing Protocol of local VRF again.

As shown in Figure 1: mainly comprise CE, PE and P equipment among the MPLS VPN;

CE: be positioned at the access device of customer network edge, belong to user's VPN in logic, certain interface of CE directly links to each other with PE equipment.

PE: provide merchant's net's backbone edge device, belong to the service provider in logic, PE links to each other with CE.Main being responsible for receives the VPN routing iinformation that the CE end sends, and sends the VPN routing iinformation to other PE.And, be distributed to corresponding CE from other PE receptions VPN routing iinformation.

P: belong to provider's net's backbone inner core equipment, discord CE links to each other.P knows the route that arrives any purpose in the backbone network, but does not know to arrive the route of VPN.

The VRF:VPN VPN route is transmitted.All maintenance and management is a series of transmits for each PE, one of them is transmitted be exactly backbone network by the overall situation transmit, other are just transmitted and are VPN route forwarding table.What the VPN route forwarding table was stored is the privately owned route of VPN user network.

VPN routing iinformation distribution procedure comprises: CE to PE VPN route distribution, PE to PE the VPN route distribution and PE to CE VPN route distribution.

CE passes to PE by moving dynamic routing protocol with PE with the route of CE to PE VPN route distribution: CE, can move OSPF (Open Shortest PathFirst) as CE1 on Fig. 1 and PE1, CE1 sends to PE1 with the routing iinformation of 10.10.1.0/16.

After PE receives the route that CE sends to the VPN route distribution of PE: PE,, and be converted into the VPNv4 route and send to other PE, realize the VPN route distribution of PE to PE for its route is enclosed related attributes such as VPN RD/RT.As PE1 above-mentioned 10.10.1.1.0/16 is enclosed and to send to PE2 after RD (1: 100) and RT attributes such as (1: 100) are converted into the VPNv4 route.

PE is to the route distribution of CE: this route distribution in fact be exactly PE go up the VPNv4 route of learning from other PE is converted into common IPv4 route after, be distributed to local CE again.After the VPNv4 route of 10.10.1.0/16 being removed attributes such as RD/RT as PE2 and being become common IPv4 route, send to CE2 again.

RD attribute: because the user in the different VPN may have identical address space in the real network, BGP stamps the RD mark with the IPv4 route that VPN user is transmitted, to change the VPNv4 route into, as long as will become different VPNv4 routes for the RD mark difference of identical IPv4 route band.

The RT attribute: when PE changed the IPv4 route into the VPNv4 route, this route can be with the RT attribute, and this attribute passes to other PE together as the VPNv4 route characteristics.When other PE receive such route, will determine whether receive this VPNv4 route and import in the VRF routing iinformation according to the local RT attributes match of its VRF.

Router Reflector: in order to allow PE send to other PE from the VPN route that CE receives, this PE must set up bgp neighbor with all PE.That is, need to set up full annexation between the PE.Supposing has n platform PE in provider's backbone network, the BGP linking number of Jian Liing is n (n-1)/2 just so.When the bgp neighbor number is a lot, need to consume a large amount of Internet resources.Utilize bgp router reflector RR to address this problem.Select an equipment as Router Reflector as shown in Figure 2 in backbone network, other PE are as reflector client, and reflector RR can give other clients PE equipment with the VPN route reflection that receives from a client PE.Reflector RR can be PE equipment, also can be P equipment.As shown in Figure 2: select P equipment as reflector RR, all PE equipment are reflector client, and reflector can send to other PE (as PE2, PE3, PE4) with the VPN route reflection that receives from certain PE (as the VPN route of PE1 transmission).

In the networking of BGP/MPLS VPN was used, it was a kind of common network configuration that improves network reliability that user access network carries out CE dual-homed.It is exactly to belong to a kind of networking mode that the CE equipment of a user access network is connected with two PE simultaneously together that so-called user inserts dual-homed.More typical networking such as Fig. 3: user access network A and B all have two links to insert provider's networks, when the user access network B of dotted line right half part will visit the user access network A of dotted line left-half among Fig. 3 like this, the forward-path of two redundancies is just arranged; When wherein an access link was out of order interruption, flow can switch on another link smoothly.

This user access network carries out the reliability that the CE dual-homing networking can effectively improve the VPN network, but for moving the possibility that can introduce route loop when dynamic routing protocol carries out route switching between PE and CE: (this network route also can be the 10.0.0.0/8 route that belongs to user network A after as above PE3 will send to PE4 from the 192.168.0.0/16 network route that ownership CE2 receives among the figure, after promptly this route sends to CE2 via PE, CE2 also may send to PE3 with its route), if PE4 sends to this route ownership CE2 again, route loop has just appearred in this situation.

Proposed to avoid this networking meeting to cause the solution of route loop at different dynamic routing exchange agreement between PE and CE among the RFC4364 BGP/MPLS VPN: the coupling by fields such as route protocol extension attributes on PE is filtered the route that sends and receive, thereby avoids the generation of loop.This method is when the PE deploy, specifically can be divided into two kinds again: A) the network route that goes up sending to ownership CE by PE is provided with special route extended attribute value (as the tag field of ospf protocol, the SOO attribute of BGP etc.), then from the PE of this ownership CE reception network route again configurations match discern this special route extended attribute value and come the route that causes loop is filtered.When this method needs CE equipment to carry out route switching, can this Routing Protocol extended attribute value of transparent transmission.B) each PE is provided with identical and unique Source Site property value to the network route that receives from same user access network, and each PE utilizes this Source Site property value of coupling that the network route that needs send to ownership CE is filtered again then.The Source Site property value of this method only need transmit between provider's network PE and get final product, and does not therefore require and will move certain specific route switching agreement between PE and CE.

In actual MPLS/BGP VPN networking is used, on two links of the dual-homed access of CE, may exist requirement to use the situation of different route switching agreements between PE and CE.As shown in Figure 4: certain VPN enterprise customer's access network B is actually by two different production divisions and forms: the A of department uses different dynamic routing exchange agreement (using RIP, the B of department procotol to use OSPF as the A of department procotol) with the B of department, and network can be by local visit mutually between these two departments; Present these two departments all requirement can be linked into provider's network by CE equipment separately, and two links of this of Jie Ruing want to provide for the other side mutually the conversion link of backup simultaneously.So-called backup, be meant break down as the link between CE2 and the PE3 after, the A of department calling party network A can be walked the link between PE4 and the CE3.

When this networking of solution is used, use the method A in the existing solution, require CE equipment can discern these Routing Protocol extended attributes, change mutually in the time of also can between different route switching agreements, heavily distributing route.Need upgrade to not supporting the CE equipment of discerning these route extended attributes when therefore method A uses, can not finely protect VPN user's network equipment investment; Increased burden because these configurations that add are also safeguarded for the VPN user network simultaneously on CE equipment, be unfavorable for that the business of MPLS VPN is carried out.Therefore the different route switching agreement of A of department and the B of department operation among Fig. 4 will have the process that the mutual heavily distribution of route is learnt between individual different routing protocol, and such two departmental networks could be realized exchanging visits.Want using method A to avoid loop, when that just needs heavily to distribute route between agreement, can change the route extended attribute value between different agreement.Use the method B in the existing solution, on PE equipment, utilize the Source Site attributes match that the VPN route of transmitting-receiving is filtered.In Fig. 4, it is 65500:1 that PE1/PE2 is provided with the Source Site property value to the 10.0.0.0/8 network route that receives from CE1, and it is 65500:2 that PE3/PE4 is provided with the Source Site property value to the 192.168.0.0/16 network route that receives from CE2/CE3.After PE3/PE4 receives the VPNv4 route of 10.0.0.0/8 from PE1/PE2, determine that its route Source Site property value is different from local user's access network B, therefore can send it to CE2/CE3, and CE3 goes up the ospf protocol of operation and the routing iinformation of this 10.0.0.0/8 can be flooded and send to PE4.(annotate: all routing iinformations of ospf protocol all can pass through the LSA flooded broadcast, therefore CE3 also can flood its route to PE4) so PE4 is last for this network route of 10.0.0.0/8, the existing VPNv4 route that receives from PE1/PE2 also has the IPv4 route that receives from CE3; According to the routing optimization principle, the IPv4 route that PE4 can preferably receive from CE3.Will occur following two kinds of situations like this: A) when the network traffics of visit 10.0.0.0/8 are arranged on the PE4, need detour via user access network B, this obviously is not best VPN network traffics trend.B) after PE4 need enclose Source Site property value (65500:2) with this preferred IPv4 route, resend to PE1/PE2/PE3; Upward be different from the VPNv4 route of user network A Source Site attribute (65500:1) at this moment for PE1/PE2, so the possibility of route loop generation is still arranged according to BGP route selection principle owing to existence.Situation 1 as Fig. 5 method B, because existing from VPNv4 route＜this route of the 10.0.0.0/8 of PE1/PE2 reception, learns PE4 by IBGP, administrative distance is defaulted as 200 〉, exist simultaneously from common IPv4 route＜this route of CE3 reception and learn by OSPF, administrative distance is defaulted as 110 〉.Therefore the route that preferably receives of PE4 from CE3, thus among Fig. 5 when CE4 visits the 10.0.0.0/8 network, need detour from user access network B, promptly through PE4-CE3-CE2-PE3-PE1-CE1.And its optimal path should be through PE4-PE2-CE1.

If, be the 10.0.0.0/8 route that to accomplish that PE4 preferably receives from PE1/PE2 so in fact by changing the administrative distance (as the ospf protocol administrative distance being made into＞the BGP administrative distance) of Routing Protocol.But at this moment can introduce the problem of preferred route again for this route of the 192.168.0.0/16 in the user access network, because the 192.168.0.0/16 route is after CE2/CE3 sends to PE3/PE4, PE3/PE4 can send to the opposite end with this route equally, PE4 goes up and also to have two for the 192.168.0.0/16 route like this: one receives from CE3, and one receives from PE3.If with the way that changes the consultative management distance, PE4 can preferably receive the 192.168.0.0/16 route from PE3 so, when CE4 visit 192.168.0.0/16, need detour via PE4 PE3 CE2 equally like this.During therefore actual networking, PE is preferred route from local CE reception realizations in.

In addition for the situation among the method B 2, therefore because there is the VPNv4 route of different SOO values on the PE1, according to BGP route selection principle, if PE1/PE2 is during preferably from the VPNv4 route of PE4 issue, if and this route is returned the possibility that at this time still has the loop route to take place to CE1.That is to say that for networking method B does not still solve the problem of route loop fully as Fig. 5.

Certainly, be that example describes only above with the CE dual-homing networking, in the CE multi-home networking, have the problem of above-mentioned said route loop equally equally.

This shows that when using different route switching agreements for 3 of the CE multi-home networking or 4 access link, the method that provides above all can not well solve the loop problem that this networking brings.

Summary of the invention

When using the CE multi-home networking in order to solve a kind of user access network based on multiprotocol label switching, the problem of dynamic routing generation loop, the embodiment of the invention provides a kind of user access multi-homing network implementation approach based on multiprotocol label switching, comprising:

The edge router PE of ownership place provider receives the virtual private network routing iinformation from other PE;

Need to judge whether the described VPN routing iinformation that receives from other PE is sent to home subscriber access device CE, if then the described VPN routing iinformation that receives from other PE is reflected other PE to ownership place;

When ownership place PE receives the VPN routing iinformation from ownership CE, judge whether the described VPN routing iinformation that receives from ownership CE is identical with the VPN routing iinformation of other PE of ownership place reflection before, if then forbid from the VPN updating route information VPN route table items of ownership CE reception.

The embodiment of the invention also provides a kind of user access multi-homing network implement device based on multiprotocol label switching simultaneously, and this device is positioned at ownership place PE, comprising:

Receiver module: be used for receiving the VPN routing iinformation and receiving the VPN routing iinformation from other PE from ownership CE;

Judging module: be used to judge whether that needs send to home subscriber access device CE with the described VPN routing iinformation that receives from other PE, reflect other PE from the VPN routing iinformation of other PE reception by reflecting module to ownership place if then will be described;

Administration module: be used for from ownership CE when receiving the VPN routing iinformation, judge whether the described VPN routing iinformation that receives from ownership CE is identical with the VPN routing iinformation of other PE of ownership place reflection before, if then forbid from the VPN updating route information VPN route table items of ownership CE reception;

Reflecting module: be used for VPN routing iinformation to other PE reflection VPN routing iinformation of ownership place and other PE reflection of reception ownership place.

Simultaneously the embodiment of the invention also provides a kind of network equipment, comprising: as the aforementioned based on the user access multi-homing network implement device of multiprotocol label switching.

The specific embodiments that is provided by the invention described above has advantage as can be seen: (1) VPN networking is used more flexible.Reflect the PE that sends to the ownership access mutually by the VPN routing iinformation that will send to ownership CE, loop problem just can be judged on ownership PE know, do not need CE to participate in the loop judgement.Especially for many access link of user access multi-homing, under the situation of the different route switching agreements of operation, this method has solved uses the Source Site attribute to solve route generation loop problem among the RFC 4364 between PE and CE.(2) low to the CE equipment requirements.Because CE equipment belongs to the user and safeguards voluntarily, so its networking is low more to the CE equipment configratioin requirement when using, and carries out favourable more to SME users' MPLS vpn service.Same many access link for user access multi-homing; between PE and CE under the situation of the different route switching agreements of operation; this method does not need CE to support some Routing Protocol expansion sign of identification etc.; therefore simpler to the functional requirement of CE equipment, the conventional network equipment investment of protecting VPN user is had very great help.

Description of drawings

Fig. 1 is a prior art MPLS VPN network topological diagram;

Fig. 2 is for comprising the network topological diagram of bgp router reflector RR in the prior art;

Fig. 3 carries out CE dual-homing networking network topological diagram for user access network in the prior art;

Fig. 4 uses the network topological diagram of different route switching agreements for two links of the dual-homed access of CE in the prior art;

Fig. 5 uses the route schematic diagram of different route switching agreements for two links of the dual-homed access of CE in the prior art;

Fig. 6 is the first embodiment network topological diagram provided by the invention;

Fig. 7 is the first embodiment method flow diagram provided by the invention;

Fig. 8 is the second embodiment network topological diagram provided by the invention.

Embodiment

The core of this programme is: each PE of ownership place will determine to send to the VPN routing iinformation of ownership CE, and reflection sends to ownership place opposite end PE (if two then reflect the PE that gives the opposite end, if other PE of ownership place is given in a plurality of then reflection); When each PE of ownership place receives the VPN route that belongs to the CE transmission, be included in the VPN routing iinformation of ownership opposite end PE reflection transmission, then forbidden from belonging to the VPN updating route information VPN route table items that CE receives if determine its VPN route.

With ownership place two PE being arranged based on the core concept of this programme below is example, does further introduction.

At first for the Router Reflector reflex circuit that is different from BGP in the prior art by way, introduce the mechanism of a loop Router Reflector.So-called loop Router Reflector, be each PE of ownership place the bgp router reflector client that the opposite end is a local terminal is set mutually, and this ownership Router Reflector neighbours connect the local interface (as loopback interface 2) that use is set, and should be different from MPLS VPN deployment BGP and connect employed local interface (as loopback interface 1).The VPN routing iinformation that the reflection of loop Router Reflector sends is only limited to the VPN routing iinformation that each PE of ownership place determines to send to ownership CE; For the VPN route that receives from the loop route reflector client, only it is judged separately as the loop route and preserve simultaneously, do not introduce and use as route distribution.

Each PE of ownership place receives the VPN route that other PE send, if determine to send it to ownership CE, then when its VPN route being sent to ownership CE, also need its VPN routing iinformation is sent to ownership place opposite end PE by loop route reflection router.Each PE of ownership place is when determining whether to select from VPN routing update VPN route table items that its ownership CE receives, judge whether its VPN route that receives from ownership CE has been present in the VPN routing table of loop route reflection router client transmission, exist the VPN routing iinformation of then not selecting from its ownership CE receives to carry out the renewal of VPN route table items, do not exist and then carry out the renewal of VPN route table items.

Be elaborated below in conjunction with Fig. 6: move ospf protocol between operation RIP agreement (level of enabling is cut apart principle on the CE2), the edge device PE4 of provider and the subscriber equipment CE3 between supposition edge device PE3 of provider and the subscriber equipment CE2, the network between A of department and the B of department is realized the route intercommunication among the user network B simultaneously.And guarantee that the 10.0.0.0/8 route among the user network A can arrive on the PE1/PE2 equipment, the 192.168.0.0/16 route among the user network B can arrive on the PE3/PE4 equipment.PE1, PE2, PE3 and PE4 move bgp protocol (the local interface loop-back address that PE3 and PE4 operation bgp protocol use is respectively 40.40.40.40/32 and 50.50.50.50/32) between any two, and PE1, PE2, PE3 and PE4 go up mutual introducing of RT attribute assurance of VRF.The concrete implementation step of the present invention on PE3 and PE4 is as follows: first embodiment provided by the invention is a kind of user access multi-homing network implementation approach based on multiprotocol label switching, and method flow comprises as shown in Figure 7:

Step 101:PE3 receives the VPN routing iinformation.

Whether the VPN route that step 102:PE3 judge to receive from other PE, i.e. PE1, PE2 or PE4, if then execution in step 103, if not, then execution in step 106.

Step 103:PE3 determine to need the VPN updating route information VPN route table items that will receive from other PE and sends to CE2.

Step 104:PE3 reflects the VPN route that receives from other PE to PE4, and the VPN routing iinformation of reflection is recorded in the reflection record.

The VPN route of step 105:PE4 storage PE3 reflection, if determine identical with the VPN route that receives from CE3 before, then send and cancel the request of this VPN route, and use from CE3 before cancelling and receive of the renewal of identical VPN routing iinformation the VPN route table items to other PE.

Step 106:PE3 judges the identical VPN route of VPN route whether stored with from the CE2 reception in the reflection table, if execution in step 107 then, execution in step 108 then if not.

Step 107: forbid from the VPN routing update VPN route table items of CE2 reception.

Step 108:PE3 selects from the VPN routing update VPN route table items of CE2 reception, and when reflection record has same VPN route, sends reflection to PE4 and cancel request.

Wherein PE3 receives the VPN routing iinformation in the step 101, it may be the VPN routing iinformation that PE3 receives from other PE, as the 10.0.0.0/8VPN routing iinformation the user network A that receives from PE1/PE2,192.168.0.0/16VPN routing iinformation from the user network B that PE4 receives or the 10.0.0.0/8VPN routing iinformation among the user network A, it also may be the VPN route that PE3 receives from ownership CE2, as receiving the IPv4 route of the corresponding VRF of 192.168.0.0/16 or 10.0.0.0/8VPNv4 (need follow level during CE2 transmission route and cut apart principle) from ownership CE2,192.168.0.0/16 that PE3 will receive from CE2 or 10.0.0.0/8IPv4 route are enclosed the VPNv4 route that obtains 192.168.0.0/16 or 10.0.0.0/8 behind the RT attribute.Certainly present embodiment is that example illustrates accordingly with PE3, for the PE4 class of operation seemingly, repeats no more herein.

Wherein in the step 102, PE3 judges that whether the VPN routing iinformation that receives is from other PE, if the VPN routing iinformation that PE3 receives is VPN routing iinformation such as the 10.0.0.0/8VPN routing iinformation (also may be the 192.168.0.0/16VPN routing iinformation certainly) that receives from other PE, then execution in step 103, if the VPN routing iinformation that PE3 receives is not the VPN routing iinformation that receives from other PE, but from belonging to the VPN route that CE2 receives, as the IPv4 route of 192.168.0.0/16 (also may be 10.0.0.0/8 certainly) the VPNv4 correspondence VRF that receives from ownership CE2, then execution in step 106.

Wherein in the step 103, if PE3 does not receive routing iinformation from CE2 when PE1 receives the 10.0.0.0/8VPN routing iinformation; Or the 10.0.0.0/8VPN routing iinformation that receives from PE1, different with the IPv4 route of routing iinformation that receives from CE2 before such as the corresponding VRF of 192.168.0.0/16VPNv4, and do not receive routing iinformation before from PE2 and PE4; Or the 10.0.0.0/8VPN routing iinformation that receives from PE1, different with the IPv4 route of routing iinformation that receives from CE2 before such as the corresponding VRF of 192.168.0.0/16VPNv4, and more preferential than the 10.0.0.0/8VPN routing iinformation that receives from PE2 or PE4 before.Then PE3 need be with the 10.0.0.0/8VPN updating route information VPN route table items that receives, and then sends to CE2.Otherwise PE3 does not need the 10.0.0.0/8VPN routing iinformation that receives is issued CE2, and also without this updating route information VPN route table items, the handling process of pressing prior art gets final product, and repeats no more herein.

Wherein in the step 104, PE3 reflects the 10.0.0.0/8VPN routing iinformation that receives from PE1 to PE4, and will be recorded in the reflection record from the 10.0.0.0/8VPN routing iinformation that PE1 receives.Simultaneously if PE3 receives the 10.0.0.0/8VPN routing iinformation from PE2 or PE4 before, equally can be to the 10.0.0.0/8VPN routing iinformation of PE4 reflection from PE2 or PE4 reception, and be recorded in the reflection record, because of PE3 is the higher route of priority from the 10.0.0.0/8VPN routing iinformation that PE1 receives, then PE3 sends reflection to PE4 and cancels request, the existing 10.0.0.0/8VPN routing iinformation from PE2 or PE4 reception that reflects to opposite end PE4 before cancelling.PE4 receives the reflection of opposite end PE3 and cancels request, with this routing iinformation in its reflection table (PE3 is to the 10.0.0.0/8VPN routing iinformation from PE2 or PE4 reception of PE4 reflection) deletion.

Wherein in the step 105, the 10.0.0.0/8VPN routing iinformation (from the 10.0.0.0/8VPN routing iinformation of PE1 reception) of PE4 storage PE3 reflection, PE4 can judge if receive the 10.0.0.0/8VPN routing iinformation equally and upgrade the route table items information (illustrate the 10.0.0.0/8VPN routing iinformation that receives from CE3 has been distributed to PE1, PE2 and PE3) of VRF with this from CE3 before, then cancels the request of 10.0.0.0/8VPN routing iinformation to PE1, PE2 and PE3 transmission.After PE1, PE2 and PE3 receive the request of cancelling the 10.0.0.0/8VPN routing iinformation, with this route deletion in the route table items of VRF separately.

Wherein in the step 106, PE3 judges whether stored and the identical VPN route of routing iinformation that receives from CE2 in its reflection table, the routing iinformation that receives from CE2 can be the IPv4 route of the corresponding VRF of 192.168.0.0/16 (also may be 10.0.0.0/8 certainly) VPNv4, and the reflection table of PE3 is used to store the VPN route from the PE4 reflection.If stored in the reflection table and the identical VPN route of routing iinformation that receives from CE2, then execution in step 107, otherwise, execution in step 108.

Wherein in the step 107, ban use of from its VRF route table items of IPv4 routing update of the corresponding VRF of 192.168.0.0/16VPNv4 of CE2 reception.

Wherein in the step 108, PE3 adopts from its VRF route table items of IPv4 routing update of the corresponding VRF of 192.168.0.0/16VPNv4 of CE2 reception, PE3 checks the identical VPN route of IPv4 route that whether has in its reflection record with the corresponding VRF of 192.168.0.0/16VPNv4 that receives from CE2, if reflection record has same VPN route, send reflection to PE4 and cancel request.

In practical operation, when PE3 receives the VPN route of 192.168.0.0/16 and then execution in step 106 from ownership CE2.

The stable back of final topology: for this route of 10.0.0.0/8, PE3 and PE4 can select from the route table items information of the VPN updating route information VRF of PE1/PE2 reception, and this routing iinformation sent to ownership CE2/CE3 the time, give ownership place opposite end PE by the loop Router Reflector with this route reflection, promptly give PE4 with this route reflection, promptly give PE3 with this route reflection by PE4 by PE3; And for this route of 192.168.0.0/16, PE3 and PE4 can upgrade the route table items information of VRF from the IPv4 route that ownership CE2/CE3 receives, and are translated into the VPNv4 route simultaneously and send to opposite end and PE1/PE2 mutually.

Second embodiment provided by the invention is a kind of user access multi-homing network implement device based on multiprotocol label switching, as shown in Figure 8, comprising:

Receiver module 201: be used for receiving the VPN routing iinformation and receiving the VPN routing iinformation from other PE from ownership CE;

Judging module 202: be used to judge whether that needs send to home subscriber access device CE with the described VPN routing iinformation that receives from other PE, reflect other PE from the VPN routing iinformation of other PE reception by reflecting module to ownership place if then will be described;

Administration module 203: be used for from ownership CE when receiving the VPN routing iinformation, judge whether the described VPN routing iinformation that receives from ownership CE is identical with the VPN routing iinformation of other PE of ownership place reflection before, if then forbid from the VPN updating route information VPN route table items of ownership CE reception;

Reflecting module 205: be used for VPN routing iinformation to other PE reflection VPN routing iinformation of ownership place and other PE reflection of reception ownership place.

Further, administration module 203: also be used for then using the VPN routing iinformation that receives from ownership CE to upgrade the VPN route table items if judge that the VPN routing iinformation of described other PE of VPN routing iinformation and ownership place that receives from ownership CE reflection before is different.

Further, administration module 203: also be used for if judge that the VPN routing iinformation of described other PE of VPN routing iinformation and ownership place that receives from ownership CE reflection before is different, whether reflect and the described identical VPN routing iinformation of VPN routing iinformation that receives from ownership CE before then also judging, if having then cancel the request of reflecting this VPN routing iinformation to other PE transmission of ownership place to other PE of ownership place.

Further, judging module 202: also be used for judging receive the VPN routing iinformation from other PE before, whether receive identical VPN routing iinformation from ownership CE, then need if not the described VPN routing iinformation that receives from other PE is sent to ownership CE.

Further, also comprise and cancel module 204: when being used to receive the VPN routing iinformation of other PE reflection of ownership place, whether receive identical VPN routing iinformation before judging from ownership CE, if then send and cancel the request of this VPN routing iinformation, and receive of the renewal of identical VPN routing iinformation with described from ownership CE before cancelling to the VPN route table items to other PE.

Further, reflecting module 205: also be used to use the loopback interface when being different from the deployment of VPN route to reflect VPN routing iinformation and receive the VPN routing iinformation that other PE reflects to other PE.

Present embodiment also provides a kind of network equipment simultaneously, comprising: aforementioned user access multi-homing network implement device based on multiprotocol label switching, and this device comprises:

This network equipment can be a router, also can be the switch of supporting MPLS.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. the user access multi-homing network implementation approach based on multiprotocol label switching is characterized in that, comprising:

2. the method for claim 1, it is characterized in that, if judge that the VPN routing iinformation of described other PE of VPN routing iinformation and ownership place that receives from ownership CE reflection before is different, then use the VPN routing iinformation that receives from ownership CE to upgrade the VPN route table items.

3. method as claimed in claim 2, it is characterized in that, if judge that the VPN routing iinformation of described other PE of VPN routing iinformation and ownership place that receives from ownership CE reflection before is different, then also comprise: whether reflect and the described identical VPN routing iinformation of VPN routing iinformation that receives from ownership CE before judging, if having then cancel the request of reflecting this VPN routing iinformation to other PE transmission of ownership place to other PE of ownership place.

4. the method for claim 1, it is characterized in that, also comprise: when described ownership place PE receives the VPN routing iinformation of other PE reflection of ownership place, whether receive identical VPN routing iinformation before judging from ownership CE, if then send and cancel the request of this VPN routing iinformation, and receive of the renewal of identical VPN routing iinformation with described from ownership CE before cancelling to the VPN route table items to other PE.

5. the method for claim 1 is characterized in that, ownership place PE and other PE of ownership place are set to route reflector client mutually.

6. method as claimed in claim 5 is characterized in that, other PE of ownership place PE and ownership place uses the loopback interface when being different from the deployment of VPN route to be set to route reflector client mutually.

7. user access multi-homing network implement device based on multiprotocol label switching is characterized in that this device is positioned at the edge router PE of ownership place provider, comprising:

8. device as claimed in claim 7, it is characterized in that, administration module: also be used for then using the VPN routing iinformation that receives from ownership CE to upgrade the VPN route table items if judge that the VPN routing iinformation of described other PE of VPN routing iinformation and ownership place that receives from ownership CE reflection before is different.

9. device as claimed in claim 7, it is characterized in that, administration module: also be used for if judge that the VPN routing iinformation of described other PE of VPN routing iinformation and ownership place that receives from ownership CE reflection before is different, whether reflect and the described identical VPN routing iinformation of VPN routing iinformation that receives from ownership CE before then also judging, if having then cancel the request of reflecting this VPN routing iinformation to other PE transmission of ownership place to other PE of ownership place.

10. device as claimed in claim 7, it is characterized in that, also comprise: cancel module: when being used to receive the VPN routing iinformation of other PE reflection of ownership place, whether receive identical VPN routing iinformation before judging, cancel this VPN if then send to other PE from ownership CE

The request of routing iinformation, and receive of the renewal of identical VPN routing iinformation with described from ownership CE before cancelling to the VPN route table items.

11. device as claimed in claim 7 is characterized in that, reflecting module: also be used to use the loopback interface when being different from the deployment of VPN route to reflect VPN routing iinformation and receive the VPN routing iinformation that other PE reflects to other PE.

12. a network equipment is characterized in that, comprising: as the described device of the arbitrary claim of claim 7-11.