CN109005109A - Path establishing method and multicast networking - Google Patents
Path establishing method and multicast networking Download PDFInfo
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- CN109005109A CN109005109A CN201810820267.3A CN201810820267A CN109005109A CN 109005109 A CN109005109 A CN 109005109A CN 201810820267 A CN201810820267 A CN 201810820267A CN 109005109 A CN109005109 A CN 109005109A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/38—Flow based routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/80—Actions related to the user profile or the type of traffic
- H04L47/806—Broadcast or multicast traffic
Abstract
The disclosure provides a kind of path establishing method and multicast networking, which includes the first Multicast Routing equipment and target sink point corresponding with target multicast group.Target sink point receives the flux of multicast that the first Multicast Routing equipment is forwarded by different paths, when the flux of multicast received be include the detection flow of snoop tag when, searched in target sink point and the detection source address of flow corresponding RPF routing and Multicast Routing corresponding with the destination address of flow is detected；Backup RPF interface is set by the interface that target sink point receives detection flow in the RPF routing found, backup incoming interface is set by the interface that target sink point receives detection flow in the Multicast Routing found, makes forward-path and the consistent flux of multicast of detection flow that can pass through rpf check on target sink point.
Description
Technical field
This disclosure relates to field of communication technology, in particular to a kind of path establishing method and multicast networking.
Background technique
PIM-SM (Protocol Independent Multicast-Sparse Mode, the sparse mould of Protocol Independent Multicast-
Formula) be a kind of sparse mode multicast routing protocol, realize multicast forwarding core missions be construct and safeguard RPT
(Rendezvous Point Tree, shared tree).RPT selects certain routing device as common root node RP
(Rendezvous Point, convergent point), request multicast packet recipient and send multicast packet multicast source by with RP
The interactive forwarding to realize multicast packet.
The multicast packet that multicast source is sent to any multicast group can first be sent to RP corresponding with the multicast group, then again
Distribute the multicast packet along the RPT of the multicast group by RP.When multicast source breaks down to the forward-path between RP, will lead to
Multicast packet packet loss.It, can be when original forward-path breaks down, rapidly by way of adding backup forward-path
It is switched to the forwarding that backup forward-path carries out multicast packet.
But routing device first can carry out RPF (Reverse Path to the multicast packet when receiving multicast packet
Forwarding, inverse path forwarding) it checks, to judge the interface for receiving the multicast packet whether in the routing device to group
It broadcasts on the shortest path in source, if so, the multicast that can be just forwarded to the multicast packet, and come from the forwarding of backup forward-path
Data are bound to finally can still result in packet loss by rpf check.
Summary of the invention
In view of this, the disclosure is designed to provide a kind of path establishing method and multicast networking, at least partly
Improve the above problem.
In order to achieve the above object, the embodiment of the present disclosure adopts the following technical scheme that
In a first aspect, the embodiment of the present disclosure provides a kind of path establishing method, it is applied to multicast networking, the multicast networking packet
Include the first Multicast Routing equipment and target sink point corresponding with target multicast group, which comprises
The target sink point receives the flux of multicast that the first Multicast Routing equipment is forwarded by different paths, when connecing
The flux of multicast received is to be searched and the detection flow when including the detection flow of snoop tag in the target sink point
The forwarding RPF routing of source IP address corresponding inverse path and multicast path corresponding with the detection purpose IP address of flow
By；
The interface that the target sink point receives the detection flow is set as backing up in the RPF routing found
RPF interface sets standby for the interface that the target sink point receives the detection flow in the Multicast Routing found
Part incoming interface, so that forward-path flux of multicast identical with the detection flow can pass through on the target sink point
Rpf check.
Second aspect, the embodiment of the present disclosure provide a kind of multicast networking, which includes the first Multicast Routing equipment
And target sink point corresponding with target multicast group；The target sink point includes:
First receiving module, the flux of multicast forwarded for receiving the first Multicast Routing equipment by different forward-paths,
When the flux of multicast received be include the detection flow of snoop tag when, in the target sink point search with the detection
The corresponding RPF routing of the source IP address of flow and Multicast Routing corresponding with the detection purpose IP address of flow；
First setup module is flowed for the target sink point to be received the detection in the RPF routing found
The interface of amount is set as backup RPF interface, and the target sink point is received the detection in the Multicast Routing found
The interface of flow is set as backup incoming interface, make that the target sink point receives by backup forward-path forwarding
Flux of multicast can pass through rpf check.
Compared to the prior art, the embodiment of the present disclosure has the advantages that
The embodiment of the present disclosure provides a kind of path establishing method and multicast networking, which includes the first Multicast Routing
Equipment and target sink point corresponding with target multicast group.Target sink point receive receive the first Multicast Routing equipment pass through
The flux of multicast of different forward-paths forwarding, when the flux of multicast received be include the detection flow of snoop tag when, in mesh
Mark searched in convergent point source IP address corresponding RPF routing with detection flow and with it is corresponding with the purpose IP address of flow is detected
Multicast Routing.Backup RPF interface is set by the interface that target sink point receives flow in the RPF routing found,
Backup incoming interface is set by the interface that target sink point receives detection flow in the Multicast Routing found, so that forwarding
Path flux of multicast identical with the detection flow can pass through rpf check on the target sink point.It so, it is possible to keep away
Exempt from when primary forward-path break down when, from other forward-paths forward flux of multicast because can not by rpf check by
It abandons.
Detailed description of the invention
It, below will be to needed in the embodiment attached in order to illustrate more clearly of the technical solution of the embodiment of the present disclosure
Figure is briefly described, it should be understood that the following drawings illustrates only some embodiments of the disclosure, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is a kind of connection schematic diagram for multicast networking that the embodiment of the present disclosure provides；
Fig. 2 is a kind of flow diagram for path establishing method that the embodiment of the present disclosure provides；
Fig. 3 is the schematic diagram of the multicast networking in a kind of specific example that the embodiment of the present disclosure provides；
Fig. 4 is a kind of process for path establishing method applied to multicast networking shown in Fig. 3 that the embodiment of the present disclosure provides
One of schematic diagram；
Fig. 5 is the process signal for the path establishing method for being applied to multicast networking shown in Fig. 3 that the embodiment of the present disclosure provides
The two of figure；
Fig. 6 is a kind of functional block diagram for multicast networking that the embodiment of the present disclosure provides.
Icon: 10,30- multicast networking；100- the first Multicast Routing equipment；The second setup module of 110-；120- sends mould
Block；200- the second Multicast Routing equipment；The second receiving module of 210-；220- third setup module；300- target sink point；310-
First receiving module；The first setup module of 320-；40- multicast source；50- multicast group.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present disclosure clearer, below in conjunction with the embodiment of the present disclosure
In attached drawing, the technical solution in the embodiment of the present disclosure is clearly and completely described, it is clear that described embodiment is
Disclosure a part of the embodiment, instead of all the embodiments.The disclosure being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the disclosure provided in the accompanying drawings is not intended to limit below claimed
The scope of the present disclosure, but be merely representative of the selected embodiment of the disclosure.Based on the embodiment in the disclosure, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model of disclosure protection
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
As shown in Figure 1, being a kind of schematic diagram for multicast networking 10 that the embodiment of the present disclosure provides.It is wrapped in the multicast networking 10
Include the first Multicast Routing equipment 100 and target sink point 300 (RP) corresponding with target multicast group.Wherein, described first group
Broadcasting routing device 100 can be any Multicast Routing equipment between multicast source and target sink point 300.For example, described first
Multicast Routing equipment 100 can be the Multicast Routing equipment direct-connected with multicast source, such as can be DR (Designated
Router, Designated Router).In the case, by the disclosure provide path establishing method can create from multicast source to
The backup forward-path of target sink point 300.
Wherein, Multicast Routing equipment refers to that operation has equipment (such as router or the three-tier switch of multicast routing protocol
Deng).In the present embodiment, the multicast routing protocol can be PIM-SM.
In practical applications, for each multicast group, a corresponding Multicast Routing equipment can be selected as the multicast group
Convergent point, the flux of multicast for being sent to the multicast group can first be dealt into the convergent point of the multicast group by multicast source, then by the convergent point
Each member flux of multicast being transmitted in the multicast group.Such as in scene shown in Fig. 1, target sink point 300 is multicast
A Multicast Routing equipment in networking 10.Accordingly, when implementing, the first Multicast Routing equipment 100 can will be sent to target group
The flux of multicast for broadcasting group is sent to target sink point 300, then by target sink point 300 be sent to target multicast group it is each at
Member.In some embodiments, the first Multicast Routing equipment 100 is usually only along optimal path to 300 forwarding group of target sink point
Flow is broadcast, when nodes break down when the optimal path or thereon, the multicast packet for being sent to target multicast group, which will will appear, to be lost
Packet.
In order to improve the above problem, the embodiment of the present disclosure provides a kind of path establishing method and multicast networking 10, below will
The content is described in detail.
As shown in Fig. 2, being a kind of flow diagram for path establishing method that the embodiment of the present disclosure provides, it is applied to Fig. 1
Shown in multicast networking 10, be stored with singlecast router in the forwarding information table of each multicast routing device in the multicast networking 10
With using the IP address of target multicast group as the target Multicast Routing of purpose address.Below in conjunction with Fig. 2 to the routing setting side
Method is described in detail, and is described in detail below.
Step S21, the first Multicast Routing equipment 100 are searched in the forwarding information table of this equipment with target sink point 300
IP address be purpose address singlecast router, outgoing interface corresponding to the backup next-hop by the singlecast router found is arranged
For the backup outgoing interface of the target Multicast Routing, to arrive the target sink point 300 in the first Multicast Routing equipment 100
Between primary forward-path when breaking down, with the IP address of the target multicast group be by backup outgoing interface forwarding
The flux of multicast of destination address.
Wherein, the singlecast router being issued in forwarding information table is the optimal routing being determined by calculation.The disclosure is implemented
Each multicast routing device in example, which is run, corresponding unicast routing protocol, and opens IP FRR function, in this way, each multicast
Routing device will automatically calculate the optimal next-hop and suboptimum next-hop of loop free, and set unicast road for the optimal next-hop
By primary next-hop, by the suboptimum next-hop be arranged into singlecast router be used as backup next-hop.
In the embodiments of the present disclosure, the primary next-hop is to be provided with the next-hop of " active " label, is backed up next
It jumps to be provided with the next-hop of " BackupInt " label.The outgoing interface being connected in Multicast Routing equipment with primary next-hop is
Primary outgoing interface, the outgoing interface being connected in Multicast Routing equipment with backup next-hop are backup outgoing interface.
When implementing, for the target multicast group for needing to establish backup forward-path, the first Multicast Routing equipment 100 can be with
The IP address of target sink point 300 corresponding with the target multicast group is determined according to the IP address of the target multicast group.Including
In the multicast networking 10 of convergent point, it can dynamically elect RP for each multicast group and be advertised to each routing device in networking,
Therefore, each routing device can determine the RP of different multicast groups in networking.
After the IP address for determining target sink point 300, search using the IP address as the singlecast router of purpose address.It obtains
Suboptimum next-hop in the singlecast router found, determine in the first Multicast Routing equipment 100 with the suboptimum next-hop pair
The outgoing interface answered sets backup outgoing interface for the outgoing interface in the target Multicast Routing, and by the target multicast path
Existing outgoing interface is set as primary outgoing interface in.
Optionally, in the present embodiment, step S21 can be realized by following sub-step:
The first Multicast Routing equipment 100 is at interval of preset duration according to the purpose IP address of the target Multicast Routing
It determines the IP address of the target sink point 300, and searches in the forwarding information table of this equipment with the target sink point 300
IP address be purpose IP address singlecast router.
In the embodiments of the present disclosure, it can be periodically for each mesh stored in the first Multicast Routing equipment 100
Multicast Routing is marked, the destination address of the target Multicast Routing is obtained, which is corresponding with the target Multicast Routing
The IP address of target multicast group, thus the destination address by getting is with can determine the IP of corresponding target sink point 300
Location, and then search using the IP address of the target sink point 300 as the singlecast router of purpose address.
Alternatively, in the present embodiment, step S21 can also be realized by following sub-step:
The first Multicast Routing equipment 100 when receiving multicast source and being sent to the flux of multicast of the target multicast group,
The IP address of the target sink point 300 is determined according to the destination address of the flux of multicast, and is set in first Multicast Routing
It searches in standby 100 forwarding information table using the IP address of the target sink point 300 as the singlecast router of purpose address.
Based on above-mentioned analysis it is found that the first Multicast Routing equipment 100 can be and periodically set in target Multicast Routing
Purchase a part outgoing interface, be also possible to when receiving flux of multicast, with the matched target group of the destination address of the flux of multicast
It broadcasts and backup outgoing interface is set in routing.
Optionally, in the present embodiment, the path establishing method can also include the following steps:
The first Multicast Routing equipment 100 is being found using the IP address of the target sink point 300 as purpose address
Singlecast router when, set the primary of the target Multicast Routing for the corresponding outgoing interface of primary next-hop of the singlecast router
Outgoing interface.
In this way, primary outgoing interface can be accordingly updated while backup outgoing interface is arranged, to ensure primary outgoing interface
For current optimal outgoing interface.
Step S22, the first Multicast Routing equipment 100 is in the flux of multicast for receiving multicast source and being sent to target multicast group
When, snoop tag is added in the flux of multicast, forms detection flow, and the detection stream is forwarded by the backup outgoing interface
Amount, to establish the optimal forwarding road of flux of multicast between the first Multicast Routing equipment 100 and target sink point 300
Diameter is used as backup forward-path.
In this embodiment, when the first Multicast Routing equipment 100 receives the flux of multicast that multicast source is sent to target multicast group
When, it can search and the matched target Multicast Routing of the destination address of the flux of multicast.If the Multicast Routing found is primary
Primary forward-path corresponding to outgoing interface does not have failure, and the first Multicast Routing equipment 100 can be somebody's turn to do from the primary outgoing interface forwarding
Flux of multicast.At the same time, the first Multicast Routing equipment 100 can replicate a flux of multicast, and add in the flux of multicast
Add the snoop tag, to form detection flow, and by searching for target Multicast Routing in the backup outgoing interface that is arranged turn
Send out detection flow described.
Wherein, the snoop tag can be pre-set any identifier, and the disclosure is without limitation.
The next-hop Multicast Routing equipment being connected with the backup outgoing interface can be notified also to carry out by the detection flow
The setting of backup outgoing interface, the next-hop Multicast Routing equipment further can forward the spy by the backup outgoing interface of setting
Measurement of discharge so can establish flux of multicast between the first Multicast Routing equipment 100 and target sink point 300
Optimal forward-path is used as backup forward-path, breaks down so as to any node in primary forward-path or thereon
When, pass through the backup forward-path forwarding multicast flow.
Optionally, referring to Fig. 1, in the embodiments of the present disclosure, the multicast networking 10 can also include being located at institute
State the second Multicast Routing equipment 200 on backup forward-path.Next-hop routing device corresponding with backup outgoing interface above-mentioned
It is the second Multicast Routing equipment 200.Accordingly, the path establishing method can also include step S23 and step S24.
Step S23, the second Multicast Routing equipment 200 are set when receiving the detection flow in second Multicast Routing
Using the IP address of the target sink point 300 as the singlecast router of purpose address in standby 200 forwarding information table, and described the
Multicast Routing is created according to the detection flow in the forwarding information table of two Multicast Routing equipment 200.
Wherein, the IP address of the target sink point 300 may be that the corresponding Multicast Routing of the target sink point 300 is set
Standby IP address, it is also possible to the IP of the lookback interface in the corresponding Multicast Routing equipment of the target sink point 300
Location.
Step S24, the second Multicast Routing equipment 200 set newly-built for the interface for receiving the detection flow
The backup incoming interface of Multicast Routing sets described newly-built for the corresponding outgoing interface of primary next-hop of the singlecast router found
Multicast Routing backup outgoing interface, and the detection flow is forwarded by the backup outgoing interface.
In the embodiments of the present disclosure, due on from the first Multicast Routing equipment 100 to the optimal path of target sink point 300
It does not include the second Multicast Routing equipment 200, thus, in the second Multicast Routing equipment 200 and there is no with target multicast
The IP address of group is the Multicast Routing of purpose address.It is then desired to be flowed in the second Multicast Routing equipment 200 according to the detection
Measure newly-built Multicast Routing.In detail, newly-built target Multicast Routing: using it is described detection flow destination address as purpose address,
It is source address, the interface being actually reached using the detection flow as incoming interface using the source address of the detection flow.
Wherein, since the detection flow itself is destined for target multicast group, thus finally newly-built Multicast Routing
It is using the IP address of the target multicast group as the target Multicast Routing of purpose address.
Further, since the second Multicast Routing equipment 200 is had been positioned in itself on backup forward-path, therefore, it is possible to should
The optimal outgoing interface that second Multicast Routing equipment 200 reaches target sink point 300 is set as connecing out for newly-built Multicast Routing
Mouthful, and add backup (BackupInt) label, that is, it will go out to connect corresponding to the primary next-hop in the singlecast router that found
Mouth is set as the backup outgoing interface of the newly-built Multicast Routing.
After setting backup outgoing interface in the newly-built target Multicast Routing, continued by the backup outgoing interface
The detection flow is forwarded, to trigger the next-hop routing device of the backup outgoing interface continues that backup outgoing interface is arranged.Finally, institute
The target sink point 300 can be forwarded to by stating detection flow, to realize the foundation of backup forward-path.
In this way, when the first Multicast Routing equipment 100 receives multicast source and is sent to the flux of multicast of target multicast group,
The matched target Multicast Routing of destination address with the flux of multicast is searched, if detecting the master in the target Multicast Routing
It, can be by the target Multicast Routing when with outgoing interface failure or the corresponding primary forward-path failure of the primary outgoing interface
Backup outgoing interface forward the flux of multicast so that the flux of multicast is forwarded to by the backup forward-path
The target sink point 300.
However, it has been investigated that, in multicast networking 10, Multicast Routing equipment can carry out the flux of multicast received
Rpf check, to ensure that flux of multicast can be along correct path transmission, and loop caused by avoiding due to various reasons.If
By rpf check, Multicast Routing equipment can be just forwarded the flux of multicast, if rpf check fails, can abandon the multicast
Flow.Multicast Routing equipment carries out rpf check, and detailed process is as follows:
Using the IP address of " message source " as purpose address, determines that an optimal routing is routed as RPF, wrapped in RPF routing
RPF interface is included, RPF interface is the corresponding outgoing interface of optimal path that Multicast Routing equipment reaches " message source ".Wherein, if
Current multicast flow is that RP is transferred to from multicast source, then is that " message source " carries out rpf check with multicast source.
In the case, although establishing backup forwarding between the first Multicast Routing equipment 100 and target sink point 300
Path, but when flux of multicast is forwarded to the target sink point 300 by the backup forward-path, it will because of nothing
Method is dropped by rpf check, can not solve the problems, such as packet loss due to link failure.
Based on the above issues, by rpf check process the study found that in practical applications, due to receiving
Each flux of multicast all carries out rpf check can carry out larger burden to Multicast Routing equipment belt, thus, when Multicast Routing equipment receives
When to the flux of multicast for sending net multicast group from multicast source, it can search in multicast forward table with the presence or absence of corresponding with the flux of multicast
Multicast Routing:
If it does not exist, then according to the source address of the flux of multicast determine RPF route, and by RPF route in RPF interface
Multicast Routing is created as incoming interface, in conjunction with dependent routing information, and the Multicast Routing of creation is issued in multicast forward table,
And carry out rpf check to the flux of multicast: when the interface that the flux of multicast is actually reached is exactly the RPF interface, then RPF is examined
It looks into and passes through, which is forwarded；When the interface that the flux of multicast is actually reached is not the RPF interface, then RPF
It checks failure, abandons the flux of multicast；
If it is present judge interface that the flux of multicast is actually reached whether be the Multicast Routing incoming interface, if
It is then directly to be forwarded to the flux of multicast；If it is not, then checking that the RPF interface and the Multicast Routing enter to connect
Whether mouth is consistent；If consistent, it is determined that Multicast Routing is correct, abandons the flux of multicast；If it is inconsistent, determining the multicast
It is out-of-date to route, and sets the RPF interface for the incoming interface of the Multicast Routing, and reexamine the flux of multicast and actually reach
Interface whether be the RPF interface, if it is, the flux of multicast is forwarded, if it is not, then abandoning the flux of multicast.
Thus, it is to be ensured that flux of multicast needs to make the road RPF corresponding with the source address of the flux of multicast by rpf check
RPF interface in, the incoming interface in Multicast Routing corresponding with the destination address of the flux of multicast and Multicast Routing equipment
The interface three for being an actually-received the flux of multicast is consistent.
Based on this, the path establishing method that the embodiment of the present disclosure provides further includes step S25 and step S26.
Step S25, the target sink point 300 receive the first Multicast Routing equipment 100 and are forwarded by different paths
Flux of multicast, when the flux of multicast received be include the detection flow of snoop tag when, in the target sink point 300
Search and the corresponding RPF routing of the detection source address of flow and multicast path corresponding with the detection destination address of flow
By.
Based on foregoing description, the first Multicast Routing equipment 100 can search and the flux of multicast when receiving flux of multicast
Matched target Multicast Routing.It, on the one hand can be from the primary outgoing interface of target Multicast Routing after finding target Multicast Routing
On the other hand forwarding multicast flow can also add snoop tag in the flux of multicast, to form detection flow, and pass through target
Backup outgoing interface in Multicast Routing forwards the detection flow.In other words, target sink point 300 can be received by two paths
Flux of multicast.Also, the flux of multicast including snoop tag received is the detection flow.When implementing, work as target
When the flux of multicast that convergent point 300 receives, whether include snoop tag, if so, can determine if detecting in the flux of multicast
The flux of multicast is the detection flow.
In the disclosure, RPF routing be current multicast routing device reach multicast source optimal routing, the RPF routing in
Including RPF interface, the as corresponding outgoing interface of primary next-hop of the optimal routing.
The target sink point 300 is received connecing for the detection flow in the RPF routing found by step S26
Mouth is set as backup RPF interface, and the target sink point 300 is received the detection flow in the Multicast Routing found
Interface be set as backup incoming interface so that forward-path flux of multicast identical with the detection flow is in the target sink
Rpf check can be passed through on point 300.
It wherein, in view of the detection flow is forwarded from the first Multicast Routing equipment 100 to the backup of target sink point 300
Path forwarding, thus, by above-mentioned setting, set when the target sink point 300 receives first Multicast Routing
When passing through the flux of multicast that the backup forward-path forwards for 100, the interface which is actually reached can be with the road RPF
The backup incoming interface in backup RPF interface and corresponding Multicast Routing in is consistent, so that the flux of multicast energy
Enough by rpf check, each member of target multicast group is forwarded to along RPT by the target sink point 300.
It is worth noting that, the second Multicast Routing equipment 200 in the embodiment of the present disclosure is receiving flux of multicast herein
When also will do it rpf check, however, since above-mentioned backup forward-path is the first Multicast Routing equipment 100 to target
The sub-optimal path of convergent point 300, it is therefore, described standby for the second Multicast Routing equipment 200 being located on backup forward-path
Part forward-path is exactly the optimal path for reaching multicast source.In the case, the second Multicast Routing equipment 200 forwards road from backup
The flux of multicast that diameter receives will be automatically by rpf check, it may not be necessary to do additional setting.
It by the above process, can be in the primary forward-path event of the first Multicast Routing equipment 100 to target sink point 300
When barrier, it is switched to the forwarding that backup forward-path carries out flux of multicast, to avoid flux of multicast packet loss.
A specific example is provided below with reference to multicast networking 30 shown in Fig. 3, with the routing provided the embodiment of the present disclosure
Setting method is further elaborated, and is described in detail below.
Brief introduction is done to multicast networking 30 shown in Fig. 3 first, multicast networking 30 includes Multicast Routing equipment R1, multicast
Routing device R2 and Multicast Routing equipment DUT, wherein Multicast Routing equipment R2 and multicast source 40 are direct-connected, Multicast Routing equipment DUT
For RP corresponding with multicast group 50, the optimal outgoing interface of Multicast Routing equipment R2 to Multicast Routing equipment DUT is A.Multicast Routing
Equipment R2 serves as the first Multicast Routing equipment 100 described in the present embodiment, and Multicast Routing equipment R1 is served as described in the present embodiment
Second Multicast Routing equipment 200.
Multicast Routing equipment R1, Multicast Routing equipment R2 and Multicast Routing equipment DUT three, which open, IP FRR function,
Based on this, the singlecast router in the FIB of above-mentioned three includes primary next-hop and backup next-hop.
In this embodiment it is assumed that the IP address of multicast source 40 is 172.168.0.2, the IP address of multicast group 50 is
227.0.0.1.The Multicast Routing M1 using 172.168.0.2 as purpose address is stored in the FIB of Multicast Routing equipment R2, it should
Multicast Routing is above-mentioned target Multicast Routing.
In multicast networking 30, Multicast Routing equipment R2 can be established to Multicast Routing by Fig. 4 and step shown in fig. 5
The backup forward-path of equipment DUT, and ensure that the flux of multicast for reaching Multicast Routing equipment DUT from the backup forward-path can
Pass through rpf check.
Step S41, Multicast Routing equipment R2 obtain the multicast path at interval of preset duration for the Multicast Routing M1 of storage
By the destination address 172.168.0.2 of M1, determine the IP address of RP corresponding with 172.168.0.2 (multicast source), and lookup with
The IP address of Multicast Routing equipment DUT is the singlecast router N1 of purpose address.
Wherein, the IP address of identified RP may be the IP address of Multicast Routing equipment DUT, it is also possible to Multicast Routing
The IP address of lookback interface on equipment DUT.
In addition, Multicast Routing equipment 42 can also when receiving the flux of multicast for being sent to 172.168.0.2, determine with
172.168.0.2 the IP address of corresponding RP, and then singlecast router N1 is searched according to the IP address of the RP.
Step S42, Multicast Routing equipment R2 determine in this equipment it is corresponding with the backup next-hop in singlecast router N1 go out
Interface is B interface, determines that outgoing interface corresponding with the primary next-hop in singlecast router N1 is A interface in this equipment, by A interface
It is arranged with B interface into the outgoing interface list of Multicast Routing M1, and adds Active label for A interface, is added for B interface
BackupInt label.
Step S43, Multicast Routing equipment R2 are when receiving multicast source 40 and being sent to the flux of multicast F1 of multicast group 50, with group
The IP address 227.0.0.1 for broadcasting group 50 is purpose address search to Multicast Routing M1, is marked by band Active in Multicast Routing M1
The A interface forwarding multicast flow F1 of note, and a flux of multicast F1 is replicated, the addition detection mark in the flux of multicast F1 of duplication
Note obtains detection flow F2, passes through the B interface forwarding detection flow F2 in Multicast Routing M2 with BackupInt label.
Step S44, Multicast Routing equipment R1 receive detection flow F2, are identifying the snoop tag in detection flow F2
When, according to detection flow F2 create Multicast Routing M2, Multicast Routing M2 using D interface as incoming interface, using 172.168.0.2 as source
Address, using 227.0.0.1 as purpose address.
Step S45, Multicast Routing equipment R1 determine corresponding RP's according to the destination address 227.0.0.1 of detection flow F2
IP address then searches using the IP address of the RP as the singlecast router N2 of purpose address in the FIB of this equipment, Multicast Routing is set
Outgoing interface C corresponding with the primary next-hop in singlecast router N2 is set as the outgoing interface in Multicast Routing M2 on standby R1, and is
The outgoing interface adds BackupInt label.
Wherein, the IP address of corresponding RP is determined according to destination address 227.0.0.1, it may be possible to Multicast Routing equipment
The IP address of DUT, it is also possible to the IP address of the lookback interface on Multicast Routing equipment DUT.
Optionally, Multicast Routing equipment R1 can also add BackupInt label for the incoming interface D in Multicast Routing M2.
Step S46, Multicast Routing equipment R1 pass through the C interface forwarding detection flow F2 marked with BackupInt.
Step S47, Multicast Routing equipment DUT (target sink point 300) receive detection flow F2, when identifying detection flow
When snoop tag in F2, finds RPF routing corresponding with the detection source address 172.168.0.2 of flow F2 and flowed with detection
Measure the corresponding Multicast Routing M3 of destination address 227.0.0.1 of F2.
Step S48, Multicast Routing equipment DUT determine that the interface that detection flow F2 is actually reached is E interface, route in RPF
It is middle to set RPF interface for E interface, and BackupInt label (i.e. formation backup RPF interface) is added for the RPF interface, in group
It broadcasts in routing M3 and sets incoming interface for E interface, and add BackupInt label for the incoming interface.
Optionally, the IP address of C interface can be set as connecing with backup RPF by Multicast Routing equipment DUT in RPF routing
The corresponding RPF neighbours of mouth E.
By the above process, when Multicast Routing equipment R2 detects that this paths of R2 → DUT break down, can pass through
Backup outgoing interface B forwarding multicast flow, thus forward the flux of multicast along this backup forward-path of R2 → R1 → DUT, and
And it to be forwarded to the member of multicast group, and then can be avoided because of link event by rpf check when being forwarded to DUT
Hinder and packet loss.
As shown in fig. 6, being a kind of functional block diagram for multicast networking 10 that the embodiment of the present disclosure provides.The multicast group
Net 10 includes the first Multicast Routing equipment 100 and target sink point 300 corresponding with target multicast group, the target sink point
300 include the first receiving module 310 and the first setup module 320.
Wherein, the first receiving module 310 is for receiving the group that the first Multicast Routing equipment is forwarded by different forward-paths
Broadcast flow, when the flux of multicast received be include the detection flow of snoop tag when, searched in the target sink point 300
And the corresponding RPF routing of the detection source address of flow and multicast path corresponding with the detection destination address of flow
By.
In the embodiments of the present disclosure, the description as described in the first receiving module 310 is specifically referred to step shown in Fig. 2
The detailed description of S25, i.e. step S25 can be executed by the first receiving module 310.
First setup module 320 is used to that the target sink point 300 to be received the spy in the RPF routing found
The interface of measurement of discharge is set as backup RPF interface, and the target sink point 300 is received institute in the Multicast Routing found
The interface for stating detection flow is set as backup incoming interface, so that forward-path flux of multicast identical with the detection flow is in institute
Rpf check can be passed through on target sink point by stating.
In the embodiments of the present disclosure, the description as described in the first setup module 320 is specifically referred to step shown in Fig. 2
The detailed description of S26, i.e. step S26 can be executed by the first receiving module 310.
Optionally, in the embodiments of the present disclosure, unicast is stored in the FIB of each multicast routing device in multicast networking 10
It routes and using the IP address of the target multicast group as the target Multicast Routing of purpose address, which has primary next
Jump and backup next-hop.In this case, the first Multicast Routing equipment 100 may include the second setup module 110.
Second setup module 110 is used to search in the forwarding information table of the first Multicast Routing equipment 100 with described
The IP address of target sink point 300 is the singlecast router of purpose address, and the backup next-hop of the singlecast router found is corresponding
Outgoing interface be set as the backup outgoing interface of the target Multicast Routing, in the first Multicast Routing equipment 100 to described
When primary forward-path between target sink point 300 breaks down, forwarded by the backup outgoing interface with the target group
The IP address for broadcasting group is the flux of multicast of purpose address.
In the embodiments of the present disclosure, the description as described in the second setup module 110 is specifically referred to step S21 shown in Fig. 2
Detailed description, i.e. step S21 can execute by the second setup module 110.
Optionally, in the embodiments of the present disclosure, the first Multicast Routing equipment 100 further includes sending module 120.
Sending module 120 is used for when receiving the multicast source and being sent to the flux of multicast of the target multicast group, at this
The snoop tag is added in flux of multicast, forms the detection flow, and the detection is forwarded by the backup outgoing interface
Flow, to establish the optimal forwarding of flux of multicast between the first Multicast Routing equipment 100 and target sink point 300
Path is as the backup forward-path.
In the embodiments of the present disclosure, the description as described in sending module 120 is specifically referred to the detailed of step S22 shown in Fig. 2
Thin description, i.e. step S22 can be executed by sending module 120.
In the embodiments of the present disclosure, the multicast networking 10 further includes the second multicast on the backup forward-path
Routing device 200, the second Multicast Routing equipment 200 may include the second receiving module 210 and third setup module 220.
Second receiving module 210 is used for when the second Multicast Routing equipment 200 receives the detection flow, at this
It searches in the forwarding information table of Multicast Routing equipment using the IP address of the target sink point 300 as the unicast road of purpose address
By, and Multicast Routing is created according to the detection flow in the forwarding information table of the second Multicast Routing equipment 200.
In the embodiments of the present disclosure, the description as described in the second receiving module 210 is specifically referred to step S23 shown in Fig. 2
Detailed description, i.e. step S23 can execute by the second receiving module 210.
Third setup module 220 is used to receive the second Multicast Routing equipment 200 interface of the detection flow
It is set as the backup incoming interface of newly-built Multicast Routing, the corresponding outgoing interface of primary next-hop of the singlecast router found is set
It is set to the backup outgoing interface of the newly-built Multicast Routing, and the detection flow is forwarded by the backup outgoing interface.
In the embodiments of the present disclosure, the description as described in third setup module 220 is specifically referred to step S24 shown in Fig. 2
Detailed description, i.e. step S24 can execute by third setup module 220.
It should be appreciated that in the embodiments of the present disclosure, any Multicast Routing equipment in multicast networking 10 all may conduct
First Multicast Routing equipment 100, it is also possible to, additionally may conduct as target sink point 300 corresponding with target multicast group
The second Multicast Routing equipment on backup forward-path between the first Multicast Routing equipment 100 and target sink point 300
200, therefore, above-mentioned each functional module both may operate in different Multicast Routing equipment, can also operate in simultaneously
In same Multicast Routing equipment.
In conclusion path establishing method and multicast networking, target sink point that the embodiment of the present disclosure provides receive first
The flux of multicast that Multicast Routing equipment is forwarded by different forward-paths, being when the flux of multicast received includes snoop tag
When detecting flow, searched in target sink point with the detection source IP address of flow corresponding RPF routing and with detect flow
The corresponding Multicast Routing of purpose IP address.The interface that target sink point receives flow is set in the RPF routing found
It is set to backup RPF interface, sets standby for the interface that target sink point receives detection flow in the Multicast Routing found
Part incoming interface, so that forward-path flux of multicast identical with the detection flow can pass through on the target sink point
Rpf check.So, it is possible to avoid the flux of multicast forwarded when primary forward-path breaks down from other forward-paths because
It can not be dropped by rpf check.
In the embodiment provided by the disclosure, it should be understood that disclosed networking and method, it can also be by other
Mode realize.The functional module embodiment of networking described above is only schematical, for example, the flow chart in attached drawing
The device of multiple embodiments according to the disclosure, the system in the cards of method and computer program product are shown with block diagram
Framework, function and operation.In this regard, each box in flowchart or block diagram can represent a module, program segment or generation
A part of code, a part of the module, section or code include one or more for realizing defined logic function
Executable instruction.It should also be noted that function marked in the box can also be in some implementations as replacement
Occur different from the sequence marked in attached drawing.For example, two continuous boxes can actually be basically executed in parallel, they
Sometimes it can also execute in the opposite order, this depends on the function involved.It is also noted that block diagram and or flow chart
In each box and the box in block diagram and or flow chart combination, can function or movement as defined in executing it is special
Hardware based system is realized, or can be realized using a combination of dedicated hardware and computer instructions.
The foregoing is merely the selected embodiments of the disclosure, are not limited to the disclosure, for the skill of this field
For art personnel, the disclosure can have various modifications and variations.It is all within the spirit and principle of the disclosure, it is made any to repair
Change, equivalent replacement, improvement etc., should be included within the protection scope of the disclosure.
Claims (10)
1. a kind of path establishing method, which is characterized in that be applied to multicast networking, which includes that the first Multicast Routing is set
Target sink point standby and corresponding with target multicast group, which comprises
The target sink point receives the flux of multicast that the first Multicast Routing equipment is forwarded by different paths, when receiving
Flux of multicast be to be searched in this equipment corresponding with the detection source address of flow when including the detection flow of snoop tag
Inverse path forwarding RPF routing and Multicast Routing corresponding with the detection destination address of flow；
Backup RPF is set by the interface that the target sink point receives the detection flow in the RPF routing found
Interface, in the Multicast Routing found by the interface that the target sink point receives the detection flow be set as backing up into
Interface, so that forward-path flux of multicast identical with the detection flow can be examined on the target sink point by RPF
It looks into.
2. path establishing method according to claim 1, which is characterized in that each Multicast Routing in the multicast networking is set
Singlecast router is stored in standby forwarding information table and using the IP address of the target multicast group as the target multicast of purpose address
Routing, the singlecast router have primary next-hop and backup next-hop, the method also includes:
The first Multicast Routing equipment is searched in the forwarding information table of this equipment is with the IP address of the target sink point
The singlecast router of destination address, outgoing interface corresponding to the backup next-hop by the singlecast router found are set as the target
The backup outgoing interface of Multicast Routing, in the first Multicast Routing equipment to the primary forwarding road between the target sink point
When diameter breaks down, forwarded by the backup outgoing interface using the IP address of the target multicast group as the multicast data flow of purpose address
Amount.
3. path establishing method according to claim 2, which is characterized in that the first Multicast Routing equipment is in this equipment
Forwarding information table in search using the IP address of the target sink point as the singlecast router of purpose IP address, comprising:
The first Multicast Routing equipment is at interval of preset duration according to the determination of the destination address of the target Multicast Routing
The IP address of target sink point, and searched for the purpose of the IP address of the target sink point in the forwarding information table of this equipment
The singlecast router of IP address；Or
The first Multicast Routing equipment when receiving the multicast source and being sent to the flux of multicast of the target multicast group, according to
The destination address of the flux of multicast determines the IP address of the target sink point, and in the forwarding of the first Multicast Routing equipment
It searches in information table using the IP address of the target sink point as the singlecast router of purpose address.
4. path establishing method according to claim 2 or 3, which is characterized in that the method also includes:
The first Multicast Routing equipment is being found using the IP address of the target sink point as the singlecast router of purpose address
When, set the corresponding outgoing interface of primary next-hop of the singlecast router to the primary outgoing interface of the target Multicast Routing.
5. path establishing method according to claim 2 or 3, which is characterized in that the method also includes:
The first Multicast Routing equipment is when receiving the multicast source and being sent to the flux of multicast of the target multicast group, at this
The snoop tag is added in flux of multicast, forms the detection flow, and the detection is forwarded by the backup outgoing interface
Flow is made with establishing the optimal forward-path of flux of multicast between the first Multicast Routing equipment and target sink point
For backup forward-path.
6. path establishing method according to claim 5, which is characterized in that the multicast networking further includes positioned at described standby
The second Multicast Routing equipment on part forward-path, the method also includes:
The second Multicast Routing equipment is when receiving the detection flow, in the forwarding information of the second Multicast Routing equipment
It searches in table using the IP address of the target sink point as the singlecast router of purpose address, and in the second Multicast Routing equipment
Forwarding information table according to the detection flow create Multicast Routing；
The second Multicast Routing equipment sets the interface for receiving the detection flow to the backup of newly-built Multicast Routing
The corresponding outgoing interface of primary next-hop of the singlecast router found is set the standby of the newly-built Multicast Routing by incoming interface
Part outgoing interface, and the detection flow is forwarded by the backup outgoing interface.
7. a kind of multicast networking, which is characterized in that the multicast networking include the first Multicast Routing equipment and with target multicast group pair
The target sink point answered；The target sink point includes:
First receiving module, the flux of multicast forwarded for receiving the first Multicast Routing equipment by different forward-paths, when connecing
The flux of multicast received is to be searched and the detection flow when including the detection flow of snoop tag in the target sink point
Source address corresponding RPF routing and Multicast Routing corresponding with the detection destination address of flow；
First setup module, for the target sink point to be received the detection flow in the RPF routing found
Interface is set as backup RPF interface, and the target sink point is received the detection flow in the Multicast Routing found
Interface be set as backup incoming interface so that forward-path flux of multicast identical with the detection flow is in the target sink
Rpf check can be passed through on point.
8. multicast networking according to claim 7, which is characterized in that each multicast routing device in the multicast networking
Singlecast router is stored in forwarding information table and using the IP address of the target multicast group as the target Multicast Routing of purpose address,
The singlecast router has primary next-hop and backup next-hop；The first Multicast Routing equipment includes:
Second setup module, for searching in the forwarding information table of the first Multicast Routing equipment with the target sink point
IP address be purpose address singlecast router, set the corresponding outgoing interface of backup next-hop of the singlecast router found to
The backup outgoing interface of the target Multicast Routing, in the first Multicast Routing equipment to the master between the target sink point
When being broken down with forward-path, forwarded by the backup outgoing interface using the IP address of the target multicast group as purpose address
Flux of multicast.
9. multicast networking according to claim 8, which is characterized in that the first Multicast Routing equipment further include:
Sending module, for when receiving the multicast source and being sent to the flux of multicast of the target multicast group, in the multicast data flow
The snoop tag is added in amount, forms the detection flow, and the detection flow is forwarded by the backup outgoing interface, with
The optimal forward-path of flux of multicast is established between the first Multicast Routing equipment and target sink point as backup
Forward-path.
10. multicast networking according to claim 9, which is characterized in that the multicast networking further includes being located at the backup
The second Multicast Routing equipment on forward-path, the second Multicast Routing equipment include:
Second receiving module, for when the second Multicast Routing equipment receives the detection flow, in the Multicast Routing
It searches in the forwarding information table of equipment using the IP address of the target sink point as the singlecast router of purpose address, and described the
Multicast Routing is created according to the detection flow in the forwarding information table of two Multicast Routing equipment；
Third setup module, the interface for the second Multicast Routing equipment to be received the detection flow are set as newly-built
Multicast Routing backup incoming interface, set described new for the corresponding outgoing interface of primary next-hop of the singlecast router found
The backup outgoing interface for the Multicast Routing built, and the detection flow is forwarded by the backup outgoing interface.
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