CN101567847A - Method and equipment for sending bootstrapping messages in multi-cast virtual private network - Google Patents
Method and equipment for sending bootstrapping messages in multi-cast virtual private network Download PDFInfo
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Abstract
The invention provides a method and an equipment for sending bootstrapping messages in a multi-cast virtual private network. The invention adopts a BSR delegable role to surrogate and process the sending of the BSR bootstrapping messages, thus reducing the quantity of the bootstrapping messages sent/received on an MTI by a PE and reducing the consumption of the bootstrapping message on PE processed resources and public net bandwidth resources.
Description
Technical field
The present invention relates to the network multicast technical field, be specifically related to a kind of method and apparatus that in multicasting virtual private network (VPN, Virtual Private Network), sends Bootstrap message (Bootstrap Message).
Background technology
Protocol Independent Multicast-sparse mode (PIM-SM, Protocol Independent Multicast-SparseMode) in the network, a kind of special router is arranged, promptly elected BootStrap Router (BSR, BootStrapRouter), elected BSR sometimes also abbreviates BSR as.Elected BSR is that (C-BSR elects out by Bootstrap message comparison priority and IP address between Candidate-BSR) for candidate bootstrap router in the network.In case determined elected BSR, it is the Bootstrap message (Bootstrap Message) of destination address with 224.0.0.13 that elected BSR just begins periodic all PIM-SM interfaces transmissions from self, the life span of this Bootstrap message (TTL, Time To Live) equals 1.The router forwarded hop-by-hop that this Bootstrap message is received spreads in whole network, so that the PIM-SM equipment of the whole network is all known the information of elected BSR.Candidate's Rendezvous Point (C-RP in the network, Candidate-Rendezvous Point) can be periodically unicast packet contain the declaration message (Advertisement Message) of self C-RP information to elected BSR, elected BSR then will be according to the declaration message that receives, with the RP pond (RP-Set) of corresponding C-RP address according to information such as its group address, mask adding oneself, and the Bootstrap message that sends by periodicity is published to the C-RP information of collecting in the whole PIM-SM network; Each router in the network will utilize identical rule according to the C-RP information of elected BSR transmission, select a C-RP as Rendezvous Point (RP, Rendezvous Point) for particular multicast group from numerous C-RP, and this RP is corresponding with this particular multicast group.RP is a kind of special C-RP.
Multicasting VPN is based on multiprotocol label switching (MPLS, Multi-Protocol Label Switching) three-layer VPN (L3VPN) network and realizes the technology of multicast transmission.MPLS L3VPN is a kind of based on Border Gateway Protocol (BGP, Border Gateway Protocol) and the VPN that realizes of MPLS expansion technique, form by the backbone network of operator and each VPN website (Site) of user, isolated each other between each website of same VPN, only could realize intercommunication by backbone network.
Figure 1 shows that a kind of typical MPLS L3VPN networking schematic diagram in the prior art.Among Fig. 1, website 1, website 3 and website 5 are formed multicasting VPN 1 network, and website 2, website 4 and website 6 are formed multicasting VPN 2 networks.Comprise following three types equipment among Fig. 1:
The backbone network nucleus equipment (P, Provider), as the P1 among Fig. 1, P2 and P3.P does not directly link to each other with CE, mainly is responsible for the MPLS message and transmits.
The Provider Edge network equipment (PE, Provider Edge) is as the PE1 among Fig. 1, PE2 and PE3.PE directly links to each other with CE, is responsible for the processing of VPN route, is the main implementor of MPLS L3VPN.
User network boundary device (CE, Customer Edge) is as the CE1～CE6 among Fig. 1.CE can be router or switch, also can be a main frame, mainly is responsible for the issue of user network route.
When moving multicasting VPN in the network shown in fig. 1, carrying three separate multicast services in this network simultaneously: public network example (instance), VPN instance 1 and VPN instance 2.The PE at public network edge supports the many examples of VPN, is equivalent to the multicast equipment of many platform independent operations, is isolated from each other between each VPN instance.With VPN instance 1 is example, multicasting VPN is meant: when the multicast source among the VPN 1 when certain multicast group sends multicast packet, among all possible recipient, the multicast member that only belongs to VPN 1 (being in website 1, website 3 or the website 5 among Fig. 1) just can be received the multicast packet that this multicast source is sent in network.Multicast packet all transmits in the multicast mode in each website and public network.
In multicasting VPN is used, private network site deployment PIM-SM, Bootstrap message can pass through PE, passes through public network and carries out alternately.As shown in Figure 2, the private network website that PE1/PE2/PE3 connected is all disposed the multicasting VPN business, and CE1, CE2 and CE3 are configured to C-BSR, and CE1 and CE3 are configured to C-RP.Suppose that CE1 is elected as elected BSR, so CE1 can outside transmission purpose periodically the Bootstrap message that is 224.0.0.13.After PE1 receives this Bootstrap message, this Bootstrap message is sent to Multicast Tunnel (MT, Multicast Tunnel), diffuse to PE2/PE3 by MT from self Multicast Tunnel Interface (MTI, Multicast TunnelInterface).PE2/PE3 receives this Bootstrap message from MTI separately, and hop-by-hop is multicasted to CE2 and CE3 again.Dotted arrow is represented the transmission path of the Bootstrap message that CE1 sends among Fig. 2.
Usually can there be more VPN instance in the multicasting VPN, for example uses in the networking, the quantity of VPN instance even can reach the order of magnitude of 1K at the L3VPN of reality.Each VPN instance all needs to safeguard the elected BSR of oneself, and each elected BSR all periodically sends Bootstrap message.In addition, during multicasting VPN is used, Multicast Tunnel Interface (MTI, Multicast Tunnel Interface) is equivalent to the radio network interface, all PE nodes are equivalent to insert simultaneously a radio network on MTI, Bootstrap message is being broadcast on the MTI mouth on all PE nodes of this radio network, and actual L3VPN often disposes dozens or even hundreds of PE node in using.
As seen from the above analysis, during the multicasting VPN of prior art is used, can be in the quantity of the Bootstrap message of public network transmission because the increase of the quantity of the quantity of VPN instance and public network PE and swift and violent increasing.PE sends on MTI/when receiving Bootstrap message, can carry out generic route encapsulation (GRE to Bootstrap message, Generic Routing Encapsulation) encapsulation/decapsulation is handled, and a large amount of Bootstrap messages is carried out the GRE encapsulation/decapsulation, will inevitably consume a large amount of processing resource of PE; And a large amount of Bootstrap messages can consume a large amount of public-network bandwidth resources when transmitting in public network.
Summary of the invention
Embodiment of the invention technical problem to be solved provides a kind of method and apparatus that sends Bootstrap message in multicasting VPN, the quantity of the Bootstrap message that minimizing PE sends on MTI/receives, thus Bootstrap message is handled resource and public-network bandwidth resource to PE consumption reduced.
For solving the problems of the technologies described above, the embodiment of the invention provides scheme as follows:
A kind of method that sends Bootstrap message in multicasting virtual private network VPN comprises:
The first Provider Edge network equipment PE receives first Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BootStrap Router BSR periodically sends, and when whenever receiving described first Bootstrap message, whether the number of times of judging first Bootstrap message that the current content that receives continuously is identical is lower than predetermined value: if then by Multicast Tunnel current first Bootstrap message that receives is forwarded to other PE in the multicasting VPN; Otherwise, do not transmit current first Bootstrap message that receives by described Multicast Tunnel; The one PE is the outlet PE of multicasting VPN website under the elected BSR, and described content comprises C-RP information;
Wherein, send to described first Bootstrap message of described other PE by Multicast Tunnel, being used to offer described other PE preserves, so that described other PE is not when receiving described first Bootstrap message in first predetermined period, periodically first Bootstrap message that the last time is preserved forwards by the private network Protocol Independent Multicast PIM interface of self.
Preferably, in the said method,
The one PE by and the periodically mutual PIM hello packet of described other PE, set up and keep and described other PE between the PIM neighborhood;
After the number of times of the first identical Bootstrap message of the current content that receives continuously meets or exceeds described predetermined value, if a PE does not receive the PIM hello packet of the arbitrary PE among described other PE in second predetermined period, then recover to transmit current first Bootstrap message that receives by described Multicast Tunnel.
Preferably, in the said method, if a described PE does not receive first Bootstrap message that elected BSR sends in the 3rd predetermined period, then send second Bootstrap message that is used to trigger the BSR election to described other PE by Multicast Tunnel, comprise first priority that promising described elected BSR is provided with in described second Bootstrap message, and described first priority is lower than the priority of candidate bsr in the described multicasting VPN.
Preferably, in the said method, described content also comprises: candidate bsr information and elected BSR information.
The embodiment of the invention also provides the another kind of method that sends Bootstrap message in multicasting virtual private network VPN, the second Provider Edge network equipment PE is connected with a PE by Multicast Tunnel, a described PE is the outlet PE of multicasting VPN website under the elected BootStrap Router BSR, and described method comprises:
The 2nd PE starts a timer, and receives first Bootstrap message that a described PE transmits by described Multicast Tunnel, and described first Bootstrap message is the Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends;
Wherein, the 2nd PE is after whenever receiving described first Bootstrap message, and the described timer of resetting is preserved current first Bootstrap message that receives, and by self private network Protocol Independent Multicast PIM interface current first Bootstrap message that receives is forwarded; Wherein, if described timer expiry, first Bootstrap message that the 2nd PE then periodically preserves the last time forwards by the private network PIM interface of self.
Preferably, in the said method, the 2nd PE further deleted previous first Bootstrap message of preserving before preserving current first Bootstrap message that receives.
The embodiment of the invention also provides the PE of the Provider Edge network equipment among a kind of multicasting virtual private network VPN, and this PE is the outlet PE of multicasting VPN website under the elected BootStrap Router BSR, comprises first receiving element and first retransmission unit, wherein,
Described first receiving element is used to receive first Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends, and when whenever receiving described first Bootstrap message, triggers described first retransmission unit;
Described first retransmission unit, be used for triggering according to described first receiving element, whether the number of times of judging first Bootstrap message that the current content that receives continuously is identical is lower than predetermined value: if then by Multicast Tunnel current first Bootstrap message that receives is forwarded to other PE in the multicasting VPN; Otherwise, do not transmit current first Bootstrap message that receives by described Multicast Tunnel; Described content comprises C-RP information;
Wherein, described first retransmission unit sends to described first Bootstrap message of described other PE by Multicast Tunnel, being used to offer described other PE preserves, so that described other PE is not when receiving described first Bootstrap message in first predetermined period, periodically first Bootstrap message that the last time is preserved forwards by the private network Protocol Independent Multicast PIM interface of self.
Preferably, among the above-mentioned PE, also comprise:
Neighbours' maintenance unit, be used for by with the periodically mutual PIM hello packet of described other PE, set up and keep the PIM neighborhood between this PE and described other PE;
Described first retransmission unit, also be used for after the number of times of the first identical Bootstrap message of the current content that receives continuously meets or exceeds described predetermined value, if described neighbours' maintenance unit does not receive the PIM hello packet of the arbitrary PE among described other PE in second predetermined period, then recover to transmit current first Bootstrap message that receives by described Multicast Tunnel.
Preferably, among the above-mentioned PE, also comprise election initiation unit;
Described first receiving element when also being used for not receiving first Bootstrap message of elected BSR transmission in the 3rd predetermined period, triggering described election and initiates the unit;
The unit is initiated in described election, be used for triggering according to described first receiving element, send second Bootstrap message that is used to trigger the BSR election by described Multicast Tunnel to described other PE, comprise first priority that promising described elected BSR is provided with in described second Bootstrap message, and described first priority is lower than the priority of candidate bsr in the described multicasting VPN.
Preferably, among the above-mentioned PE, described content also comprises: candidate bsr information and elected BSR information.
The embodiment of the invention also provides the second Provider Edge network equipment PE among a kind of multicasting virtual private network VPN, the 2nd PE is connected with a PE by Multicast Tunnel, a described PE is the outlet PE of multicasting VPN website under the elected BootStrap Router BSR, and the 2nd PE comprises second receiving element and second retransmission unit;
Described second receiving element, be used to start a timer, and receive first Bootstrap message that a described PE transmits by described Multicast Tunnel, and after whenever receiving described first Bootstrap message, the described timer of resetting, and trigger described second retransmission unit, wherein, described first Bootstrap message is the Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends;
Described second retransmission unit is used for the triggering according to described second receiving element, preserves current first Bootstrap message that receives, and by the private network Protocol Independent Multicast PIM interface of this 2nd PE self current first Bootstrap message that receives is forwarded; Wherein, if described first timer is overtime, then first Bootstrap message of periodically the last time being preserved forwards by the private network PIM interface of this 2nd PE self.
Preferably, among the 2nd PE, described second receiving element also was used for before preserving current first Bootstrap message that receives, further previous first Bootstrap message of preserving of deletion.
The embodiment of the invention also provides the PE of the Provider Edge network equipment among the another kind of multicasting virtual private network VPN, comprises role's judging unit, first receiving element, first retransmission unit, second receiving element and second retransmission unit, wherein,
Described role's judging unit is used for judging whether the elected BSR of multicasting VPN is positioned at the multicasting VPN website that this PE connects, if then start described first receiving element; Otherwise, start described second receiving element;
Described first receiving element is used to receive first Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends, and when whenever receiving one first Bootstrap message, triggers described first retransmission unit;
Described first retransmission unit, be used for triggering according to described first receiving element, whether the number of times of judging first Bootstrap message that the current content that receives continuously is identical is lower than predetermined value: if then by Multicast Tunnel current first Bootstrap message that receives is forwarded to other PE in the multicasting VPN; Otherwise, do not transmit current first Bootstrap message that receives by described Multicast Tunnel; Described content comprises C-RP information;
Described second receiving element, be used to start a timer, and receive first Bootstrap message that a PE transmits by Multicast Tunnel, and after whenever receiving one first Bootstrap message, the described timer of resetting, and trigger described second retransmission unit, wherein, a described PE is the outlet PE of multicasting VPN website under the elected BootStrap Router BSR, and described first Bootstrap message is the Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends;
Described second retransmission unit is used for the triggering according to described second receiving element, preserves current first Bootstrap message that receives, and by the private network Protocol Independent Multicast PIM interface of this PE self current first Bootstrap message that receives is forwarded; Wherein, if described first timer is overtime, then first Bootstrap message of periodically the last time being preserved forwards by the private network PIM interface of this PE.
Preferably, among the above-mentioned PE, also comprise:
Neighbours' maintenance unit, be used for by with the periodically mutual PIM hello packet of described other PE, set up and keep the PIM neighborhood between this PE and other PE;
Described first retransmission unit, also be used for after the number of times of the first identical Bootstrap message of the current content that receives continuously meets or exceeds described predetermined value, if described neighbours' maintenance unit does not receive the PIM hello packet of the arbitrary PE among described other PE in second predetermined period, then recover to transmit current first Bootstrap message that receives by described Multicast Tunnel.
Preferably, among the above-mentioned PE, also comprise election initiation unit;
Described first receiving element when also being used for not receiving first Bootstrap message of elected BSR transmission in the 3rd predetermined period, triggering described election and initiates the unit;
The unit is initiated in described election, is used for the triggering according to described first receiving element, sends second Bootstrap message that is used to trigger the BSR election by described Multicast Tunnel to described other PE.
Preferably, among the above-mentioned PE, described content also comprises: candidate bsr information and elected BSR information.
From the above as can be seen, the method and apparatus that in multicasting VPN, sends Bootstrap message that the embodiment of the invention provides, by a PE first Bootstrap message that elected BSR sends is analyzed, when the first Bootstrap message content stable, stop to send first Bootstrap message by Multicast Tunnel, reduced the quantity of a PE by first Bootstrap message of MT transmission, first Bootstrap message is carried out GRE encapsulate needed processing resource thereby saved a PE, reduced first Bootstrap message taking public-network bandwidth; Simultaneously, the embodiment of the invention has also reduced the quantity of first Bootstrap message that the 2nd PE receives from Multicast Tunnel, thereby reduced by the 2nd PE first Bootstrap message that receives from Multicast Tunnel has been separated the work of treatment amount that GRE encapsulates, the processing resource of having saved the 2nd PE.
Description of drawings
Fig. 1 is a kind of typical MPLS L3VPN networking schematic diagram in the prior art;
Fig. 2 is the transmission schematic diagram of the Bootstrap message that elected BSR sends in the prior art;
Fig. 3 is the described flow chart that sends the method for Bootstrap message in multicasting VPN of the embodiment of the invention;
The structural representation of a kind of PE that Fig. 4 provides for the embodiment of the invention;
The structural representation of a kind of the 2nd PE that Fig. 5 provides for the embodiment of the invention;
The structural representation of the another kind of PE that Fig. 6 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of method and apparatus that sends Bootstrap message in multicasting VPN, on the PE of multicasting VPN, adopt the BSR agency mechanism, spread scope with the BSR message is controlled in the private network scope as far as possible, send on MTI to reduce PE/handle the device processes resource that is consumed because of the GRE encapsulation/decapsulation when receiving Bootstrap message, reduce Bootstrap message taking simultaneously the public network link bandwidth.The present invention is described further by specific embodiment below in conjunction with accompanying drawing.
Include a PE and the 2nd PE in the multicasting VPN of the embodiment of the invention, wherein, a PE is the outlet PE of multicasting VPN website under the elected BSR, and the 2nd PE is the PE that is connected with a PE by the Multicast Tunnel in the public network.Because network topology structure has certain stability in the multicasting VPN, the C-RP increase and decrease in the multicasting VPN is not frequent generation, and therefore, the content of first Bootstrap message that elected BSR periodically sends usually is identical.In this case, a PE can suppress the transmission of first Bootstrap message, no longer first Bootstrap message is sent to other PE by MT; The 2nd PE then can utilize first Bootstrap message of previous preservation, periodically transmits in local VPN.
As shown in Figure 3, the described method that sends Bootstrap message in multicasting VPN of the embodiment of the invention may further comprise the steps:
Here, in the step 33, the 2nd PE can delete first Bootstrap message of previous preservation before preserving current first Bootstrap message that receives, preserve current first Bootstrap message that receives again, with conserve storage.
In the above-mentioned steps 32, the one PE sends to described first Bootstrap message of described other PE by Multicast Tunnel, being used to offer described other PE preserves, so that described other PE is not when receiving described first Bootstrap message in first predetermined period, periodically first Bootstrap message that the last time is preserved forwards by the private network PIM interface of self.The numerical value of the overtime thresholding of first predetermined period and timer is identical, specifically can be set to be equal to or higher than the numerical value that elected BSR sends the transmission cycle of first Bootstrap message.
In the above-mentioned steps 32, the one PE is by judging whether the C-RP information in first Bootstrap message is identical, when the number of times of the first identical Bootstrap message of the current C-RP information that receives continuously meets or exceeds predetermined value, inhibition is carried out in the transmission of first Bootstrap message handled, stop to send current first Bootstrap message that receives by Multicast Tunnel.Present embodiment can also be provided with more strict judgment mode, the content that comprises C-RP information, candidate bsr information and elected BSR information in first Bootstrap message is judged, when the number of times of the first all identical Bootstrap message of the current foregoing that receives continuously meets or exceeds predetermined value, just carry out the inhibition processing is carried out in the transmission of first Bootstrap message, stop to send current first Bootstrap message that receives by Multicast Tunnel.
In the present embodiment, elected BSR is positioned at the local VPN website of a PE, so a PE as BSR proxy role 1, bears the inhibition of first Bootstrap message is handled; The 2nd PE receives first Bootstrap message that a PE transmits from MT, thereby the 2nd PE can judge elected BSR in the VPN website that far-end PE connected, and not in the local VPN website of the 2nd PE, therefore, the 2nd PE is as BSR proxy role 2, when a PE suppresses first Bootstrap message, bear the work that sends first Bootstrap message to local VPN website.By above-mentioned processing, present embodiment has reduced the quantity of first Bootstrap message that a PE sends on MTI, and the quantity that has reduced first Bootstrap message that the 2nd PE receives on MTI, handle the device processes resource that consumed because of the GRE encapsulation/decapsulation thereby reduced PE when MTI transmission/reception first Bootstrap message.Owing to reduced the quantity of first Bootstrap message that transmits by MT, present embodiment has also been saved the bandwidth resources of public network link simultaneously.
If the C-RP in the multicasting VPN changes, elected BSR can obtain this information, and upgrades the C-RP information in first Bootstrap message, after a PE receives first Bootstrap message, judge C-RP information and change, then recover to send current first Bootstrap message that receives by Multicast Tunnel.After this, if new variation does not take place the C-RP information in first Bootstrap message that receives, then after the number of times of this first Bootstrap message that receives reaches predetermined value, a PE again can be again suppresses to handle to the transmission of first Bootstrap message.
Same as the prior art, in the present embodiment, a PE by and multicasting VPN in the periodically mutual PIM hello packet of other PE, set up and keep and described other PE between the PIM neighborhood.After the number of times of the first identical Bootstrap message of the current C-RP information that receives continuously met or exceeded described predetermined value, a PE suppressed to handle to first Bootstrap message.In suppressing the process of handling, if a PE does not receive the PIMHello message of the arbitrary PE among described other PE in second predetermined period, then this arbitrary PE of explanation may break down, the work of the BSR proxy role 2 that it is born also may be affected, at this moment, the one PE stops the inhibition of first Bootstrap message is handled, and recovers to transmit current first Bootstrap message that receives by described Multicast Tunnel, can be diffused into each VPN website smoothly to guarantee first Bootstrap message.Here, the numerical value of second predetermined period can be set to the several times that the PIMHello message sends the cycle, for example, is set to 3～5 PIM hello packet and sends the cycle.
In addition, consider that elected BSR also may break down, as crashing or restarting, present embodiment further increases following treatment mechanism: after elected BSR breaks down, and dwelling period transmission first Bootstrap message; If a PE does not receive first Bootstrap message that elected BSR sends in the 3rd predetermined period, then send second Bootstrap message that is used to trigger the BSR election to described other PE by Multicast Tunnel.Here, can the priority of described elected BSR be arranged to minimumly in second Bootstrap message, be lower than the candidate bsr in the multicasting VPN, thereby trigger the BSR election of a new round, concrete way to elect is same as the prior art, repeats no more herein.If elected BSR changes, a PE no longer is the outlet PE of VPN website under the elected BSR, and a PE will no longer bear the work of BSR proxy role 1 so.Described the 3rd predetermined period specifically can be set to be higher than the numerical value that elected BSR sends the transmission cycle of first Bootstrap message, for example is arranged to be several times as much as a numerical value in the transmission cycle of first Bootstrap message.
Be example still below, the described method of present embodiment be further explained explanation, to help better to understand present embodiment with networking structure shown in Figure 2.
Suppose that the private network website that the PE1/PE2/PE3 among Fig. 2 is connected separately all disposes the multicasting VPN business, comprising at each private network site deployment PIM-SM.CE1, CE2 and CE3 all are configured to C-BSR, and CE1 and CE3 are configured to C-RP.
During the CE1 initial access network, as C-BSR, it is the Bootstrap message of 224.0.0.13 that CE1 can outwards send destination address, includes the C-BSR information of CE1 in this Bootstrap message.After PE1 receives and detects this Bootstrap message, find to have newly-increased C-BSR (being CE1),, send this Bootstrap message by MTI other PE in multicasting VPN therefore according to existing Bootstrap message transmission flow.This Bootstrap message sends to PE2/PE3 by MT in public network, PE2/PE3 can find to have newly-increased C-BSR after receiving this Bootstrap message equally, therefore can send this Bootstrap message to separately CE according to existing Bootstrap message transmission flow, then, re-elect elected BSR according to the BSR election flow process of prior art.Suppose that CE1 is elected as elected BSR.
As elected BSR, CE1 will gather the C-RP information in the network, and periodically by Bootstrap message the C-RP information of collecting will be published in the whole PIM-SM network.At this moment, when PE1 receives the Bootstrap message of CE1 transmission, can be by looking into self routing table, the next hop address that is found to the route of elected BSR (CE1) is positioned at local VPN website, and therefore, PE1 bears the work of BSR proxy role 1.PE2/PE3 is behind the Bootstrap message that receives the PE1 forwarding, look into routing table separately, the next hop address that can be found to the route of elected BSR (CE1) is far-end PE (i.e. the PE1 that is connected with this PE by Multicast Tunnel), therefore, PE2/PE3 thinks it oneself is BSR proxy role 2, thereby bears the work of BSR proxy role 2.
After this, PE1 receives the Bootstrap message that CE1 sends, and can judge whether the identical Bootstrap message of the current C-RP information that receives continuously reaches predetermined value, if do not reach, then transmits the current Bootstrap message that receives by Multicast Tunnel to PE2/PE3; When PE2/PE3 receives the Bootstrap message that PE1 sends from Multicast Tunnel, preserve the C-RP information in this Bootstrap message, simultaneously as BSR proxy role 2, PE2/PE3 also can preserve this Bootstrap message.
After after a while, suppose that the number of times of the Bootstrap message (Bootstrap message that CE1 sends) that C-RP information that PE1 receives is identical reaches predetermined value, at this moment, PE1 will stop to send the current Bootstrap message that receives by MTI; If PE2/PE3 (being the timer expiry in the above-mentioned steps 33) in a Bootstrap message receiving cycle does not receive the Bootstrap message that PE1 sends, then as BSR proxy role 2, the private network PIM interface (promptly bind the PIM interface of VPN) of beginning cycle by self sends the last Bootstrap message of preserving.
Greet (PIM Hello) message by periodically mutual PIM between PE1 and the PE2/PE3, set up and keep the PIM neighborhood.When the inferior PIM hello packet of not receiving that PE2 or PE3 send of PE1 continuous N (M is a predefined numerical value), think that then the BSR proxy role goes wrong, this moment, PE1 recovered to send by MTI the Bootstrap message from CE1 of current reception immediately.
C-RP in network changes, occur unusual as the CE3 in the local VPN website of PE3, after a period of time, owing to do not receive the C-RP message that CE3 sends, CE1 will upgrade the C-RP information in the Bootstrap message, PE1 receives that at this moment, PE recovers to send by MTI the Bootstrap message from CE1 of current reception from finding behind the Bootstrap message of CE1 that C-RP information changes.
If it is unusual that elected BSR takes place, crash as CE1, after PE1 does not receive the Bootstrap message of CE1 in a period of time, can send new Bootstrap message at once, and the priority of the BSR message of CE1 is set to minimumly in this new Bootstrap message, can trigger BSR election so again.
C-BSR in multicasting VPN increases, and also is deployed as C-BSR as CE3, after PE3 receives the Bootstrap message of CE3 transmission so, this Bootstrap message is forwarded to all PE by MTI, chooses to initiate BSR.If CE3 is elected as new elected BSR, PE3 then becomes BSR proxy role 1 so, and PE2 becomes BSR proxy role 2, carries out corresponding work separately.
More than describe the method that in multicasting VPN, sends Bootstrap message in detail.At last, the embodiment of the invention also provides in order to implement the PE of said method.The described PE of the embodiment of the invention includes but not limited to router device, three-tier switch equipment.
As shown in Figure 4, the embodiment of the invention provides a kind of PE, and this PE is the outlet PE of multicasting VPN website under the elected BootStrap Router BSR, comprises first receiving element and first retransmission unit, wherein,
Described first receiving element is used to receive first Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends, and when whenever receiving one first Bootstrap message, triggers described first retransmission unit;
Described first retransmission unit, be used for triggering according to described first receiving element, whether the number of times of judging first Bootstrap message that the current content that receives continuously is identical is lower than predetermined value: if then by Multicast Tunnel current first Bootstrap message that receives is forwarded to other PE in the multicasting VPN; Otherwise, do not transmit current first Bootstrap message that receives by described Multicast Tunnel; Described content comprises C-RP information;
Wherein, described first retransmission unit sends to described first Bootstrap message of described other PE by Multicast Tunnel, being used to offer described other PE preserves, so that described other PE is not when receiving described first Bootstrap message in first predetermined period, periodically first Bootstrap message that the last time is preserved forwards by the private network Protocol Independent Multicast PIM interface of self.
Preferably, among the above-mentioned PE, can also comprise: neighbours' maintenance unit, be used for by with the periodically mutual PIM hello packet of described other PE, set up and keep the PIM neighborhood between this PE and other PE.Described first retransmission unit, can also be used for after the number of times of the first identical Bootstrap message of the current content that receives continuously meets or exceeds described predetermined value, if described neighbours' maintenance unit does not receive the PIM hello packet of the arbitrary PE among described other PE in second predetermined period, then recover to transmit current first Bootstrap message that receives by described Multicast Tunnel.
Preferably, among the above-mentioned PE, can also comprise election initiation unit;
Described first receiving element when also being used for not receiving first Bootstrap message of elected BSR transmission in the 3rd predetermined period, triggering described election and initiates the unit;
The unit is initiated in described election, is used for the triggering according to described first receiving element, sends second Bootstrap message that is used to trigger the BSR election by described Multicast Tunnel to described other PE.Here, comprise first priority that promising described elected BSR is provided with in described second Bootstrap message, and described first priority is lower than the priority of candidate bsr in the described multicasting VPN.
Preferably, among the above-mentioned PE, described content can also comprise: candidate bsr information and elected BSR information.
The embodiment of the invention also provides a kind of the 2nd PE, and the 2nd PE is connected with a PE by Multicast Tunnel, and a described PE is the outlet PE of multicasting VPN website under the elected BootStrap Router BSR.As shown in Figure 5, the 2nd PE comprises second receiving element and second retransmission unit, wherein,
Described second receiving element, be used to start a timer, and receive first Bootstrap message that a described PE transmits by described Multicast Tunnel, and after whenever receiving one first Bootstrap message, the described timer of resetting, and trigger described second retransmission unit, wherein, described first Bootstrap message is the Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends;
Described second retransmission unit is used for the triggering according to described second receiving element, preserves current first Bootstrap message that receives, and by the private network Protocol Independent Multicast PIM interface of this 2nd PE self current first Bootstrap message that receives is forwarded; Wherein, if described first timer is overtime, then first Bootstrap message of periodically the last time being preserved forwards by the private network PIM interface of this 2nd PE self.
Here, preferably, described second receiving element can also be used for before preserving current first Bootstrap message that receives, further previous first Bootstrap message of preserving of deletion.
The embodiment of the invention also provides another PE at last, and as shown in Figure 6, this PE comprises role's judging unit, first receiving element, first retransmission unit, second receiving element and second retransmission unit, wherein,
Described role's judging unit is used for judging whether the elected BSR of multicasting VPN is positioned at the multicasting VPN website that this PE connects, if then start described first receiving element; Otherwise, start described second receiving element;
Described first receiving element is used to receive first Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends, and when whenever receiving one first Bootstrap message, triggers described first retransmission unit;
Described first retransmission unit, be used for triggering according to described first receiving element, whether the number of times of judging first Bootstrap message that the current content that receives continuously is identical is lower than predetermined value: if then by Multicast Tunnel current first Bootstrap message that receives is forwarded to other PE in the multicasting VPN; Otherwise, do not transmit current first Bootstrap message that receives by described Multicast Tunnel; Described content comprises C-RP information;
Described second receiving element, be used to start a timer, and receive first Bootstrap message that a PE transmits by Multicast Tunnel, and after whenever receiving one first Bootstrap message, the described timer of resetting, and trigger described second retransmission unit, wherein, a described PE is the outlet PE of multicasting VPN website under the elected BootStrap Router BSR, and described first Bootstrap message is the Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends;
Described second retransmission unit is used for the triggering according to described second receiving element, preserves current first Bootstrap message that receives, and by the private network Protocol Independent Multicast PIM interface of this PE self current first Bootstrap message that receives is forwarded; Wherein, if described first timer is overtime, then first Bootstrap message of periodically the last time being preserved forwards by the private network PIM interface of this PE.
Preferably, among the PE shown in Figure 6, can also comprise: neighbours' maintenance unit, be used for by with the periodically mutual PIM hello packet of described other PE, set up and keep the PIM neighborhood between this PE and other PE.Described first retransmission unit, also be used for after the number of times of the first identical Bootstrap message of the current content that receives continuously meets or exceeds described predetermined value, if described neighbours' maintenance unit does not receive the PIM hello packet of the arbitrary PE among described other PE in second predetermined period, then recover to transmit current first Bootstrap message that receives by described Multicast Tunnel.
Preferably, among the PE shown in Figure 6, can also comprise election initiation unit.Described first receiving element when also being used for not receiving first Bootstrap message of elected BSR transmission in the 3rd predetermined period, triggering described election and initiates the unit; The unit is initiated in described election, is used for the triggering according to described first receiving element, sends second Bootstrap message that is used to trigger the BSR election by described Multicast Tunnel to described other PE.
Preferably, among the PE shown in Figure 6, described content can also comprise: candidate bsr information and elected BSR information.
In sum, the embodiment of the invention is by the BSR agency mechanism of different PE nodes, reduced the Bootstrap message quantity that PE sends/receives on MTI, thereby alleviated PE, reduced Bootstrap message taking simultaneously the public network link forwarding bandwidth because of carrying out the resource consumption that the GRE encapsulation/decapsulation is handled.
The above only is embodiments of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (16)
1. a method that sends Bootstrap message in multicasting virtual private network VPN is characterized in that, comprising:
The first Provider Edge network equipment PE receives first Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BootStrap Router BSR periodically sends, and when whenever receiving described first Bootstrap message, whether the number of times of judging first Bootstrap message that the current content that receives continuously is identical is lower than predetermined value: if then by Multicast Tunnel current first Bootstrap message that receives is forwarded to other PE in the multicasting VPN; Otherwise, do not transmit current first Bootstrap message that receives by described Multicast Tunnel; The one PE is the outlet PE of multicasting VPN website under the elected BSR, and described content comprises C-RP information;
Wherein, send to described first Bootstrap message of described other PE by Multicast Tunnel, being used to offer described other PE preserves, so that described other PE is not when receiving described first Bootstrap message in first predetermined period, periodically first Bootstrap message that the last time is preserved forwards by the private network Protocol Independent Multicast PIM interface of self.
2. the method for claim 1 is characterized in that,
The one PE by and the periodically mutual PIM hello packet of described other PE, set up and keep and described other PE between the PIM neighborhood;
After the number of times of the first identical Bootstrap message of the current content that receives continuously meets or exceeds described predetermined value, if a PE does not receive the PIM hello packet of the arbitrary PE among described other PE in second predetermined period, then recover to transmit current first Bootstrap message that receives by described Multicast Tunnel.
3. method as claimed in claim 1 or 2, it is characterized in that, if a described PE does not receive first Bootstrap message that elected BSR sends in the 3rd predetermined period, then send second Bootstrap message that is used to trigger the BSR election to described other PE by Multicast Tunnel, comprise first priority that promising described elected BSR is provided with in described second Bootstrap message, and described first priority is lower than the priority of candidate bsr in the described multicasting VPN.
4. method as claimed in claim 3 is characterized in that, described content also comprises: candidate bsr information and elected BSR information.
5. method that in multicasting virtual private network VPN, sends Bootstrap message, the second Provider Edge network equipment PE is connected with a PE by Multicast Tunnel, a described PE is the outlet PE of multicasting VPN website under the elected BootStrap Router BSR, it is characterized in that described method comprises:
The 2nd PE starts a timer, and receives first Bootstrap message that a described PE transmits by described Multicast Tunnel, and described first Bootstrap message is the Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends;
Wherein, the 2nd PE is after whenever receiving described first Bootstrap message, and the described timer of resetting is preserved current first Bootstrap message that receives, and by self private network Protocol Independent Multicast PIM interface current first Bootstrap message that receives is forwarded; Wherein, if described timer expiry, first Bootstrap message that the 2nd PE then periodically preserves the last time forwards by the private network PIM interface of self.
6. method as claimed in claim 5 is characterized in that, the 2nd PE further deleted previous first Bootstrap message of preserving before preserving current first Bootstrap message that receives.
7. the Provider Edge network equipment PE among the multicasting virtual private network VPN, this PE is the outlet PE of multicasting VPN website under the elected BootStrap Router BSR, it is characterized in that this PE comprises first receiving element and first retransmission unit, wherein,
Described first receiving element is used to receive first Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends, and when whenever receiving described first Bootstrap message, triggers described first retransmission unit;
Described first retransmission unit, be used for triggering according to described first receiving element, whether the number of times of judging first Bootstrap message that the current content that receives continuously is identical is lower than predetermined value: if then by Multicast Tunnel current first Bootstrap message that receives is forwarded to other PE in the multicasting VPN; Otherwise, do not transmit current first Bootstrap message that receives by described Multicast Tunnel; Described content comprises C-RP information;
Wherein, described first retransmission unit sends to described first Bootstrap message of described other PE by Multicast Tunnel, being used to offer described other PE preserves, so that described other PE is not when receiving described first Bootstrap message in first predetermined period, periodically first Bootstrap message that the last time is preserved forwards by the private network Protocol Independent Multicast PIM interface of self.
8. PE as claimed in claim 7 is characterized in that, also comprises:
Neighbours' maintenance unit, be used for by with the periodically mutual PIM hello packet of described other PE, set up and keep the PIM neighborhood between this PE and described other PE;
Described first retransmission unit, also be used for after the number of times of the first identical Bootstrap message of the current content that receives continuously meets or exceeds described predetermined value, if described neighbours' maintenance unit does not receive the PIM hello packet of the arbitrary PE among described other PE in second predetermined period, then recover to transmit current first Bootstrap message that receives by described Multicast Tunnel.
9. as claim 7 or 8 described PE, it is characterized in that, also comprise election initiation unit;
Described first receiving element when also being used for not receiving first Bootstrap message of elected BSR transmission in the 3rd predetermined period, triggering described election and initiates the unit;
The unit is initiated in described election, be used for triggering according to described first receiving element, send second Bootstrap message that is used to trigger the BSR election by described Multicast Tunnel to described other PE, comprise first priority that promising described elected BSR is provided with in described second Bootstrap message, and described first priority is lower than the priority of candidate bsr in the described multicasting VPN.
10. PE as claimed in claim 9 is characterized in that, described content also comprises: candidate bsr information and elected BSR information.
11. the second Provider Edge network equipment PE among the multicasting virtual private network VPN, the 2nd PE is connected with a PE by Multicast Tunnel, a described PE is the outlet PE of multicasting VPN website under the elected BootStrap Router BSR, it is characterized in that the 2nd PE comprises second receiving element and second retransmission unit;
Described second receiving element, be used to start a timer, and receive first Bootstrap message that a described PE transmits by described Multicast Tunnel, and after whenever receiving described first Bootstrap message, the described timer of resetting, and trigger described second retransmission unit, wherein, described first Bootstrap message is the Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends;
Described second retransmission unit is used for the triggering according to described second receiving element, preserves current first Bootstrap message that receives, and by the private network Protocol Independent Multicast PIM interface of this 2nd PE self current first Bootstrap message that receives is forwarded; Wherein, if described first timer is overtime, then first Bootstrap message of periodically the last time being preserved forwards by the private network PIM interface of this 2nd PE self.
12. the 2nd PE as claimed in claim 11 is characterized in that,
Described second receiving element also was used for before preserving current first Bootstrap message that receives, further previous first Bootstrap message of preserving of deletion.
13. the Provider Edge network equipment PE among the multicasting virtual private network VPN is characterized in that, comprises role's judging unit, first receiving element, first retransmission unit, second receiving element and second retransmission unit, wherein,
Described role's judging unit is used for judging whether the elected BSR of multicasting VPN is positioned at the multicasting VPN website that this PE connects, if then start described first receiving element; Otherwise, start described second receiving element;
Described first receiving element is used to receive first Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends, and when whenever receiving one first Bootstrap message, triggers described first retransmission unit;
Described first retransmission unit, be used for triggering according to described first receiving element, whether the number of times of judging first Bootstrap message that the current content that receives continuously is identical is lower than predetermined value: if then by Multicast Tunnel current first Bootstrap message that receives is forwarded to other PE in the multicasting VPN; Otherwise, do not transmit current first Bootstrap message that receives by described Multicast Tunnel; Described content comprises C-RP information;
Described second receiving element, be used to start a timer, and receive first Bootstrap message that a PE transmits by Multicast Tunnel, and after whenever receiving one first Bootstrap message, the described timer of resetting, and trigger described second retransmission unit, wherein, a described PE is the outlet PE of multicasting VPN website under the elected BootStrap Router BSR, and described first Bootstrap message is the Bootstrap message that includes candidate's Rendezvous Point C-RP information that elected BSR periodically sends;
Described second retransmission unit is used for the triggering according to described second receiving element, preserves current first Bootstrap message that receives, and by the private network Protocol Independent Multicast PIM interface of this PE self current first Bootstrap message that receives is forwarded; Wherein, if described first timer is overtime, then first Bootstrap message of periodically the last time being preserved forwards by the private network PIM interface of this PE.
14. PE as claimed in claim 13 is characterized in that, also comprises:
Neighbours' maintenance unit, be used for by with the periodically mutual PIM hello packet of described other PE, set up and keep the PIM neighborhood between this PE and other PE;
Described first retransmission unit, also be used for after the number of times of the first identical Bootstrap message of the current content that receives continuously meets or exceeds described predetermined value, if described neighbours' maintenance unit does not receive the PIM hello packet of the arbitrary PE among described other PE in second predetermined period, then recover to transmit current first Bootstrap message that receives by described Multicast Tunnel.
15 PE as claimed in claim 13 is characterized in that, also comprise election initiation unit;
Described first receiving element when also being used for not receiving first Bootstrap message of elected BSR transmission in the 3rd predetermined period, triggering described election and initiates the unit;
The unit is initiated in described election, is used for the triggering according to described first receiving element, sends second Bootstrap message that is used to trigger the BSR election by described Multicast Tunnel to described other PE.
16. PE as claimed in claim 13 is characterized in that, described content also comprises: candidate bsr information and elected BSR information.
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| CN2009100858115A CN101567847B (en) | 2009-06-01 | 2009-06-01 | Method and equipment for sending bootstrapping messages in multi-cast virtual private network |
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| CN2009100858115A CN101567847B (en) | 2009-06-01 | 2009-06-01 | Method and equipment for sending bootstrapping messages in multi-cast virtual private network |
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| CN101567847B CN101567847B (en) | 2012-01-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102217254A (en) * | 2011-05-23 | 2011-10-12 | 华为技术有限公司 | Method and apparatus for transferring boot strap information |
| CN102281148A (en) * | 2011-08-22 | 2011-12-14 | 福建星网锐捷网络有限公司 | Method for establishing multicast distribution tree in mode of inter-virtual private network (VPN), equipment and system thereof |
| CN105591961A (en) * | 2015-07-29 | 2016-05-18 | 杭州华三通信技术有限公司 | Method and device for selecting rendezvous point RP for multicast group |
| WO2016150394A1 (en) * | 2015-03-25 | 2016-09-29 | 华为技术有限公司 | Method, device and system for transmitting multicast protocol packet |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7046662B1 (en) * | 2001-08-21 | 2006-05-16 | Nortel Networks Ltd | System, device, and method for distributing routing information in an optical virtual private network |
| KR100925732B1 (en) * | 2005-05-27 | 2009-11-11 | 엘지전자 주식회사 | Method and device for securely sending bootstrap message in device managment |
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2009
- 2009-06-01 CN CN2009100858115A patent/CN101567847B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102217254A (en) * | 2011-05-23 | 2011-10-12 | 华为技术有限公司 | Method and apparatus for transferring boot strap information |
| WO2011144065A3 (en) * | 2011-05-23 | 2012-05-03 | 华为技术有限公司 | Method and apparatus for transferring bootstrap message |
| CN102217254B (en) * | 2011-05-23 | 2014-06-04 | 华为技术有限公司 | Method and apparatus for transferring boot strap information |
| US9608897B2 (en) | 2011-05-23 | 2017-03-28 | Huawei Technologies Co., Ltd. | Method and device for transferring bootstrap message |
| CN102281148A (en) * | 2011-08-22 | 2011-12-14 | 福建星网锐捷网络有限公司 | Method for establishing multicast distribution tree in mode of inter-virtual private network (VPN), equipment and system thereof |
| CN102281148B (en) * | 2011-08-22 | 2014-07-02 | 福建星网锐捷网络有限公司 | Method for establishing multicast distribution tree in mode of inter-virtual private network (VPN), equipment and system thereof |
| WO2016150394A1 (en) * | 2015-03-25 | 2016-09-29 | 华为技术有限公司 | Method, device and system for transmitting multicast protocol packet |
| CN105591961A (en) * | 2015-07-29 | 2016-05-18 | 杭州华三通信技术有限公司 | Method and device for selecting rendezvous point RP for multicast group |
| CN105591961B (en) * | 2015-07-29 | 2019-06-14 | 新华三技术有限公司 | For the method and apparatus of multicast group selection convergent point RP |
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| CN101567847B (en) | 2012-01-11 |
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