CN104052672A - Multicast achieving method and device based on LISP - Google Patents
Multicast achieving method and device based on LISP Download PDFInfo
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Abstract
The invention discloses a multicast achieving method and device based on the LISP. The multicast achieving method based on the LISP comprises the steps that after the functions of a tunnel router are agented by an enable BSR, a registration message is sent to an MS, wherein the registration message contains the information of the functions, agented by the enable BSR, of the tunnel router; the tunnel router sends a first bootstrap message to the MS when receiving the first bootstrap message; the tunnel router receives a second bootstrap message, from another tunnel router, forwarded by the MS, and a first (EID and RLOC) mapping table is formed by means of address information contained in the second bootstrap message. According to the multicast achieving method based on the LISP, trans-LISP-network transmission of PIM SM protocol messages can be achieved, the LISP multicast function is achieved under the condition that the address of a multicast source is unknown for the ITR/ETR, and the multicast achieving method and device based on the LISP can effectively support the LISP network.
Description
Technical field
The present invention relates to communication technical field, especially a kind of method of realizing group broadcasting and equipment based on LISP.
Background technology
As shown in Figure 1, for LISP (Location/ID Separation Protocol, position and identity separated protocol) the networking schematic diagram of network, this LISP network can be divided into network ip address EID (Endpoint ID, end mark) and RLOC (Routing Locator, route locating).Wherein, can introduce the mapping relations of EID-to-RLOC in LISP network, this EID is used for identifying main frame, does not possess overall routing function, and this RLOC is for the whole network route.In LISP network, IPv4 or IPv6 main frame only identify its ID, and its position is identified by ITR (Ingress Tunnel Router, tunnel portal router)/ETR (Egress Tunnel Router, tunnel outlet router).LISP network comprises datum plane and control plane, and datum plane is mainly used in encapsulation/decapsulation and the forwarding of message, and control plane mainly completes the mapping of EID and RLOC.
In LISP network, by realizing LISP multicast functionality with current multicast protocol, its core concept is: multicast data message is carried out multicast encapsulation by ITR, is transferred to ETR carries out decapsulation by core net, and ETR transmits the multicast data message after decapsulation again.
In prior art, in order to realize LISP multicast functionality in LISP network, ITR/ETR need to know multicast source address, needs to know (EID, RLOC) mapping relations of multicast source.But, for the networking schematic diagram of the LISP network shown in Fig. 2, as a PIM SM (Protocol Independent Multicast-Sparse Mode of multiple LISP network composition, Protocol Independent Multicast-Sparse Mode) when territory, ITR/ETR cannot be known (the EID of multicast source, RLOC) mapping relations, cannot realize LISP multicast functionality then.
Summary of the invention
The embodiment of the present invention provides a kind of method of realizing group broadcasting and equipment based on LISP, so that ITR/ETR realizes LISP multicast functionality in the situation that not knowing multicast source address, and effectively supports LISP network.
In order to achieve the above object, the embodiment of the present invention provides a kind of method of realizing group broadcasting based on LISP, is applied in the network that comprises mapping server MS and multiple tunnel routers, and described method comprises:
Tunnel router is enabling after BootStrap Router BSR agent functionality, sends registration message to described MS, carries described tunnel router and enabled the information of BSR agent functionality in described registration message;
Described tunnel router, in the time of the first Bootstrap message of receiving from the candidate bsr in the LISP network at this tunnel router place, sends to described MS by described the first Bootstrap message;
Described tunnel router receives the second Bootstrap message from other tunnel router that described MS forwards, utilize the address information of carrying in described the second Bootstrap message to generate the first (end mark EID, route locating RLOC) mapping table, and to the second Bootstrap message described in the each device forwards in the LISP network at described tunnel router place; Wherein, described EID is the address information of the candidate bsr in the LISP network at described other tunnel router place, and described RLOC is the address information of described other tunnel router.
Described tunnel router also comprises after utilizing address information generation first (EID, the RLOC) mapping table carrying in described the second Bootstrap message:
When the candidate convergent point of described tunnel router in the LISP network of receiving this tunnel router place declared message to first of BSR transmission, if BSR is in the LISP at other tunnel router place network, utilize the first (EID, RLOC) described the first declaration message is sent to other tunnel router by the information recording in mapping table, declares that message repeating is to BSR by other tunnel router by described first;
Described tunnel router is receiving that other tunnel router utilizes the first (EID, when what the information RLOC) recording in mapping table forwarded declares message from second of candidate's convergent point, utilize the address information of carrying in described the second declaration message to generate the second (EID, RLOC) mapping table, and described the second declaration message is sent to the BSR in the LISP network at this tunnel router place; Wherein, the described EID in described second (EID, RLOC) mapping table is the address information of the candidate's convergent point in the LISP network at described other tunnel router place, and described RLOC is the address information of described other tunnel router.
Described tunnel router also comprises after utilizing address information generation second (EID, the RLOC) mapping table carrying in described the second declaration message:
Described tunnel router is in the time of the 3rd Bootstrap message of receiving from the BSR in the LISP network at this tunnel router place, utilize described the second (EID, RLOC) described the 3rd Bootstrap message is sent to other tunnel router by the information recording in mapping table, and the each equipment by other tunnel router, described the 3rd Bootstrap message being transmitted in the LISP network at other tunnel router place carries out the election of convergent point.
Described tunnel router also comprises after utilizing address information generation second (EID, the RLOC) mapping table carrying in described the second declaration message:
The multicast source of described tunnel router in the LISP network of receiving this tunnel router place to convergent point send multicast data message time, if convergent point is in the LISP at other tunnel router place network, utilize the second (EID, RLOC) described multicast data message is sent to other tunnel router by the information recording in mapping table, by other tunnel router, described multicast data message sent to convergent point;
Described tunnel router is receiving that other tunnel router utilizes the second (EID, RLOC) when the multicast data message from multicast source that the information that records in mapping table forwards, described multicast data message is sent to the convergent point in the LISP network at this tunnel router place, and receive (the S that described convergent point returns, G) join message, and by described (S, G) join message and send to described other tunnel router, and described in being forwarded to described multicast source by described other tunnel router, (S, G) joins message.
The embodiment of the present invention provides the method for realizing group broadcasting of a kind of position-based and identity separated protocol LISP, is applied in the network that comprises mapping server MS and multiple tunnel routers, and described method comprises:
Described MS receives the registration message from tunnel router; Wherein, in described registration message, carried described tunnel router and enabled the information of BSR agent functionality;
Described MS, in the time knowing that tunnel router has enabled BSR agent functionality, records the corresponding relation between the address information of described tunnel router and the receiving interface of described registration message in BSR mapping table;
Described MS receives the Bootstrap message from other tunnel router, and utilizes the information recording in described BSR mapping table that described Bootstrap message is transmitted to described tunnel router.
The embodiment of the present invention provides the tunnel router of a kind of position-based and identity separated protocol LISP, is applied in the network that comprises mapping server MS and multiple tunnel routers, and described tunnel router comprises:
Sending module, for enabling after BootStrap Router BSR agent functionality, sends registration message to described MS, carries described tunnel router and enabled the information of BSR agent functionality in described registration message;
In the time of the first Bootstrap message of receiving from the candidate bsr in the LISP network at described tunnel router place, described the first Bootstrap message is sent to described MS;
In the time receiving the second Bootstrap message from other tunnel router that described MS forwards, to the second Bootstrap message described in the each device forwards in the LISP network at described tunnel router place;
Generation module, for in the time receiving described the second Bootstrap message, utilize the address information of carrying in described the second Bootstrap message to generate the first (end mark EID, route locating RLOC) mapping table, described EID is the address information of the candidate bsr in the LISP network at described other tunnel router place, and described RLOC is the address information of described other tunnel router.
Described sending module, while also declaring message for the candidate's convergent point in the LISP network of receiving described tunnel router place to first of BSR transmission, if described BSR is in the LISP at other tunnel router place network, utilize described the first (EID, RLOC) described the first declaration message is sent to other tunnel router by the information recording in mapping table, declares that message repeating is to BSR by described other tunnel router by described first; Receiving that other tunnel router utilizes described the first (EID, RLOC), when the second declaration message from candidate's convergent point that the information that records in mapping table forwards, described the second declaration message is sent to the BSR in the LISP network at this tunnel router place;
Described generation module, also for receiving that other tunnel router utilizes the first (EID, when what the information RLOC) recording in mapping table forwarded declares message from second of candidate's convergent point, utilize the address information of carrying in described the second declaration message to generate the second (EID, RLOC) mapping table, described the second (EID, RLOC) the described EID in mapping table is the address information of the candidate's convergent point in the LISP network at described other tunnel router place, and described RLOC is the address information of described other tunnel router.
Described sending module, also for when the 3rd Bootstrap message of receiving from the BSR in the LISP network at described tunnel router place, utilize the second (EID, RLOC) described the 3rd Bootstrap message is sent to other tunnel router by the information recording in mapping table, and the each equipment by other tunnel router, described the 3rd Bootstrap message being transmitted in the LISP network at other tunnel router place carries out the election of convergent point.
Described sending module, also for the multicast source in the LISP network of receiving described tunnel router place to convergent point send multicast data message time, if convergent point is in the LISP at other tunnel router place network, utilize the second (EID, RLOC) described multicast data message is sent to other tunnel router by the information recording in mapping table, by other tunnel router, described multicast data message sent to convergent point; Receiving that other tunnel router utilizes the second (EID, RLOC) when the multicast data message from multicast source that the information that records in mapping table forwards, described multicast data message is sent to the convergent point in the LISP network at described tunnel router place, and receive (the S that described convergent point returns, G) join message, and by described (S, G) join message and send to described other tunnel router, and described in being forwarded to described multicast source by described other tunnel router, (S, G) joins message.
The embodiment of the present invention provides the mapping server MS of a kind of position-based and identity separated protocol LISP, is applied in the network that comprises described MS and multiple tunnel routers, and described MS specifically comprises:
Receiver module, for receiving the registration message from tunnel router; Wherein, in described registration message, carried described tunnel router and enabled the information of BSR agent functionality;
Memory module in the time knowing that tunnel router has enabled BSR agent functionality, records the corresponding relation between the address information of tunnel router and the receiving interface of registration message in BSR mapping table;
Sending module, for when the Bootstrap message of receiving from other tunnel router, utilizes the information recording in described BSR mapping table that described Bootstrap message is transmitted to tunnel router.
Compared with prior art, the embodiment of the present invention at least has the following advantages: in the embodiment of the present invention, in the time of a PIM SM territory of multiple LISP network composition, by enable BSR (Bootstrap Router on tunnel router (as tunnel portal router ITR and tunnel outlet router ETR), BootStrap Router) agent functionality, thereby can realize the transmission of PIM SM protocol massages leap LISP network, regard multiple independently LISP networks as a PIM SM territory, unified election BSR and RP (Rendezvous Point, convergent point), for LISP multicast provides more selection scheme, and can in the situation that not knowing multicast source address, realize at ITR/ETR LISP multicast functionality, and effectively support LISP network.
Brief description of the drawings
Fig. 1 and Fig. 2 are the networking schematic diagrames of the LISP network that proposes in prior art;
Fig. 3 is a kind of method of realizing group broadcasting schematic flow sheet based on LISP that the embodiment of the present invention proposes;
Fig. 4 is the form schematic diagram of a kind of Map-register of expansion message of embodiment of the present invention proposition;
Fig. 5 and Fig. 6 are the form schematic diagrames that Bootstrap message is encapsulated that the embodiment of the present invention proposes;
Fig. 7 is the application schematic diagram of a kind of RPT building process of embodiment of the present invention proposition;
Fig. 8 is the application schematic diagram of a kind of multicast data packet forwarding process of embodiment of the present invention proposition;
Fig. 9 is the structural representation of a kind of tunnel router of providing of the embodiment of the present invention;
Figure 10 is the structural representation of a kind of mapping server MS of embodiment of the present invention proposition.
Embodiment
For problems of the prior art, the embodiment of the present invention provides a kind of method of realizing group broadcasting based on LISP, the method is applied to and comprises MS (Map Server, mapping server) and the network of multiple tunnel routers in, tunnel router can be tunnel portal router ITR and tunnel outlet router ETR.Application scenarios schematic diagram taking Fig. 2 as the embodiment of the present invention, a PIM SM territory of multiple LISP networks (being LISP network A and LISP network B) composition, tunnel router is ITR1, ITR2, ETR1 and ETR2, and multicast source is positioned at LISP network A, and recipient is positioned at LISP network B.ITR in LISP network A is connected with MS by MR (Map Resolver, mapping resolver), and the ETR in LISP network B is directly connected with MS.In addition, the priority of C-BSR1 (Candidate-BSR, candidate bsr), C-BSR2, C-BSR3 is identical, and its IP address is respectively 1.0.0.1/24,2.2.0.1/24 and 2.2.0.2/24.C-RP1 (Candidate-RP, candidate RP) priority is that 10, IP address is 1.1.0.2/24, and the priority of C-RP2, C-RP3 and C-RP4 is 1, and the multicast group range that all C-RP serve is identical.
DR (Designated Router, Designated Router) as unique forwarding person of multicast packet in shared network, in LISP network A, need to be DR corresponding to shared network election multicast source by hello packet, in LISP network B, need to be DR corresponding to shared network election recipient by hello packet.The election process of DR is identical with the DR election process of current PIM SM technology, repeats no more herein.
As shown in Figure 3, should specifically can comprise the following steps by the method for realizing group broadcasting based on LISP:
Step 301, tunnel router, after enabling BSR agent functionality, sends registration message to MS.Wherein, in this registration message, carried tunnel router and enabled the information of BSR agent functionality.
Under the application scenarios shown in Fig. 2, when enable BSR agent functionality on ITR1 and ETR1 after, ITR1 can periodically (arrange a timer, acquiescence can be 30s in the transmission cycle) to MS transmission registration message, and the information of having carried ITR1 in this registration message and enabled BSR agent functionality; ETR1 periodically (timer is set, and the acquiescence transmission cycle can be 30s) to MS transmission registration message, and the information of having carried ETR1 in this registration message and enabled BSR agent functionality.
Wherein, the registration message that ITR1 and ETR1 send to MS can be the Map-register of expansion (mapping registration) message, as shown in Figure 4, for the form schematic diagram of Map-register message of expansion, the Map-register message of this expansion, by Reserved (reserving) field in expansion Map-register message, identifies ITR1 or ETR1 and has enabled BSR agent functionality.As: the 1bit of Reserved field is defined as to M position, and M=1 mark ITR1 or ETR1 have enabled BSR agent functionality.
Step 302, MS, in the time knowing that tunnel router has enabled BSR agent functionality, records the corresponding relation between the address information of this tunnel router and the receiving interface of registration message in BSR mapping table.
In the embodiment of the present invention, on MS, need to safeguard BSR mapping table, this BSR mapping table is used for recording the corresponding relation between the address information of tunnel router (having enabled the tunnel router of BSR agent functionality) and the receiving interface of registration message (having enabled the tunnel router of BSR agent functionality to the registration message of MS transmission).Based on this, MS is after the registration message of receiving from tunnel router, enabled BSR agent functionality if parse tunnel router from this registration message, MS records the corresponding relation between the address information of this tunnel router and the receiving interface of this registration message in BSR mapping table.
As shown in Figure 2, MS is after the registration message of receiving from ITR1, learn that by parsing the ITR1 that sends this registration message has enabled BSR agent functionality, MS records the corresponding relation between the address information (10.0.0.1/24) of ITR1 and the receiving interface (being assumed to be interface 1) of registration message in BSR mapping table.MS is after the registration message of receiving from ETR1, learn that by parsing the ETR1 that sends this registration message has enabled BSR agent functionality, MS records the corresponding relation between the address information (11.0.0.1/24) of ETR1 and the receiving interface (being assumed to be interface 2) of registration message in BSR mapping table.
Step 303, tunnel router, in the time of the first Bootstrap message (being BSM message) of receiving from the candidate bsr in the LISP network at this tunnel router place, sends to MS by this first Bootstrap message.
As shown in Figure 2, in LISP network A, C-BSR1 can send Bootstrap message (i.e. the first Bootstrap message) to the all-router in LISP network A, ITR1 is after the Bootstrap message of receiving from C-BSR1, find that the source IP address of this Bootstrap message is in local routing table, therefore ITR1 confirms that this Bootstrap message is from the candidate bsr in the LISP network A at this ITR1 place, and this Bootstrap message is carried out to LISP encapsulation, and the Bootstrap message after LISP encapsulation is sent to MS by MR.
As shown in Figure 5, for ITR1, Bootstrap message is carried out the form schematic diagram of LISP encapsulation.MR is after the Bootstrap message of receiving after this LISP encapsulation, by BGP (Border Gateway Protocol, Border Gateway Protocol)-over-GRE (Generic Routing Encapsulation, generic route encapsulation) tunnel sends to MS, as shown in Figure 6, for MR, Bootstrap message is carried out the form schematic diagram of tunnel encapsulation.In Fig. 5, the address of the non-ITR1 of source IP address in OH, the address that object IP address is MR; In Fig. 6, the address of the non-ITR1 of source IP address in OH, the address that object IP address is MS.
As shown in Figure 2, in LISP network B, C-BSR2 and C-BSR3 all can send Bootstrap message (i.e. the first Bootstrap message) to the all-router in LISP network B, ETR1 is after the Bootstrap message of receiving respectively from C-BSR2 and C-BSR3, find from the source IP address of the Bootstrap message of C-BSR2 and C-BSR3 all in local routing table, therefore confirm that Bootstrap message from C-BSR2 and C-BSR3 is from the candidate bsr in the LISP network B at this ETR1 place.Because Bootstrap message from C-BSR2 and C-BSR3 is simultaneously in LISP network B, therefore ETR1 can be only to preferably carrying out LISP encapsulation from the Bootstrap message of C-BSR3, and Bootstrap message after LISP is encapsulated sends to MS.
As shown in Figure 5, for ETR1, Bootstrap message is carried out the form schematic diagram of LISP encapsulation.In Fig. 5, the address of the non-ITR1 of source IP address in OH, the address that object IP address is MS.
Step 304, MS receives the first Bootstrap message from tunnel router, and the information recording in the BSR mapping table that utilizes this MS to safeguard forwards this first Bootstrap message to other tunnel router.
As shown in Figure 2, the information recording in the BSR mapping table that MS safeguards is: the corresponding relation between address information (10.0.0.1/24) and the interface 1 of ITR1, the corresponding relation between address information (11.0.0.1/24) and the interface 2 of ETR1.Based on the information recording in BSR mapping table, when MS receives the first Bootstrap message from ITR1 by interface 1, utilize the corresponding relation between address information (11.0.0.1/24) and the interface 2 of ETR1, by interface 2, this first Bootstrap message is transmitted to ETR1; When MS receives the first Bootstrap message from ETR1 by interface 2, utilize the corresponding relation between address information (10.0.0.1/24) and the interface 1 of ITR1, by interface 1, this first Bootstrap message is transmitted to ITR1.
Step 305, tunnel router receives the second Bootstrap message from other tunnel router that MS forwards, and utilize the address information of carrying in this second Bootstrap message to generate the first (EID, RLOC) mapping table, and to each device forwards the second Bootstrap message in the LISP network at this tunnel router place.Wherein, the EID in this first (EID, RLOC) mapping table is the address information of the candidate bsr in the LISP network at other tunnel router place, and the RLOC address information that is other tunnel router.
As shown in Figure 2, ITR1 receives the second Bootstrap message from ETR1 that MS forwards, and this second Bootstrap message is the Bootstrap message after LISP encapsulation, and ITR1 is by the second Bootstrap message is carried out to LISP decapsulation, to obtain original Bootstrap message.Afterwards, because the source IP address of Bootstrap message is not in local routing table, therefore ITR1 utilizes the address information of carrying in this Bootstrap message to generate the first (EID, RLOC) mapping table, this first (EID, RLOC) EID in mapping table corresponds to the address information (being the address information of candidate bsr in Bootstrap message) of the C-BSR3 in the LISP network B at ETR1 place, and RLOC corresponds to the address information (being the source IP address in the Inner Header in Bootstrap message) of ETR1.In addition, ITR1 forwards this Bootstrap message to the each direct-connected device in the LISP network A at this ITR1 place, so that this Bootstrap message is directly sent to the all-router in LISP network A.
As shown in Figure 2, ETR1 receives the second Bootstrap message from ITR1 that MS forwards, and this second Bootstrap message is the Bootstrap message after LISP encapsulation, and ETR1 is by the second Bootstrap message is carried out to LISP decapsulation, to obtain original Bootstrap message.Afterwards, because the source IP address of Bootstrap message is not in local routing table, therefore ETR1 utilizes the address information of carrying in this Bootstrap message to generate the first (EID, RLOC) mapping table, this first (EID, RLOC) EID in mapping table corresponds to the address information (being the address information of candidate bsr in Bootstrap message) of the C-BSR1 in the LISP network A at ITR1 place, and RLOC corresponds to the address information (being the source IP address in the Inner Header in Bootstrap message) of ITR1.In addition, ETR1 forwards this Bootstrap message to the each direct-connected device in the LISP network B at this ETR1 place, so that this Bootstrap message is directly sent to the all-router in LISP network B.
Based on above-mentioned processing, the Bootstrap message in LISP network can send in other LISP network across LISP network, and the router in each LISP network can elect BSR based on the BSR technology of electing from candidate bsr.Under the application scenarios shown in Fig. 2, suppose that C-BSR3 is elected as the BSR in pim-sm domain.
After electing BSR, also need to from each C-RP of each LISP network, elect RP, based on this, the method for realizing group broadcasting based on LISP proposing in the embodiment of the present invention can also comprise the following steps:
When step 1, the candidate convergent point of tunnel router in the LISP network of receiving this tunnel router place are declared message to first of BSR transmission, if BSR is in the LISP at other tunnel router place network, utilize the first (EID, RLOC) the first declaration message is sent to other tunnel router by the information recording in mapping table, by other tunnel router by the first declaration message repeating to BSR.
As shown in Figure 2, when the candidate convergent point (as C-RP1 or C-RP2) of ITR1 in the LISP network A of receiving this ITR1 place declared message to first of BSR (C-BSR3) transmission, because C-BSR3 is in the LISP at ETR1 place network B, and the upper maintenance of ITR1 has the first (EID, RLOC) mapping table, and this first (EID, RLOC) EID in mapping table corresponds to the address information of the C-BSR3 in the LISP network B at ETR1 place, and RLOC corresponds to the address information of ETR1, therefore ITR1 is after receiving the first declaration message, can utilize this first (EID, RLOC) information recording in mapping table is carried out LISP encapsulation to this first declaration message, and the first declaration message after LISP encapsulation is directly sent to ETR1, and by ETR1 by this first declaration message repeating to C-BSR3.
Step 2, tunnel router are in the time receiving the second declaration message from candidate's convergent point that other tunnel router forwards, utilize the address information of carrying in this second declaration message to generate the second (EID, RLOC) mapping table, and the second declaration message is sent to the BSR in the LISP network at this tunnel router place.Wherein, the EID in this second (EID, RLOC) mapping table is the address information of the candidate's convergent point in the LISP network at other tunnel router place, and the RLOC address information that is other tunnel router.
As shown in Figure 2, ETR1 is in the time receiving the second declaration message from C-RP1 that ITR1 forwards, this the second declaration message is carried out to LISP decapsulation, declaration message after this LISP decapsulation is sent to the C-BSR3 in the LISP network B at this ETR1 place, and utilize the address information of carrying in declaration message to generate the second (EID, RLOC) mapping table, this second (EID, RLOC) EID in mapping table is the address information of the C-RP1 in the LISP network A at ITR1 place, and the RLOC address information that is ITR1.ETR1 is in the time receiving the second declaration message from C-RP2 that ITR1 forwards, this the second declaration message is carried out to LISP decapsulation, declaration message after this LISP decapsulation is sent to the C-BSR3 in the LISP network B at this ETR1 place, and utilize the address information of carrying in declaration message to generate the second (EID, RLOC) mapping table, this second (EID, RLOC) EID in mapping table is the address information of the C-RP2 in the LISP network A at ITR1 place, and the RLOC address information that is ITR1.
Step 3, BSR (as C-BSR3) collect the declaration message from each C-RP (as C-RP1, C-RP2, C-RP3 and C-RP4), the C-RP address of carrying in messages according to these declarations, priority with and the class range of service, gather (the RP collection for RP-Set, be the mapping relations database of multicast group and RP), and RP-Set is encapsulated in the 3rd Bootstrap message, and send the 3rd Bootstrap message with broadcast mode.
In the time that C-BSR3 sends the 3rd Bootstrap message with broadcast mode, the 3rd Bootstrap message can send on the each equipment in LISP network B, and ETR1 can receive the 3rd Bootstrap message from C-BSR3.
Step 4, tunnel router are in the time of the 3rd Bootstrap message of receiving from the BSR in the LISP network at this tunnel router place, utilize the second (EID, RLOC) the 3rd Bootstrap message is sent to other tunnel router by the information recording in mapping table, and the each equipment by other tunnel router, the 3rd Bootstrap message being transmitted in the LISP network at other tunnel router place carries out the election of convergent point.
As shown in Figure 2, ETR1 is in the time of the 3rd Bootstrap message of receiving from the BSR in the LISP network B at this ETR1 place (being C-BSR3), due to the second (EID of ETR1, RLOC) EID in mapping table is C-RP1 in the LISP network A at ITR1 place or the address information of C-RP2, and the address information that RLOC is ITR1, therefore, ETR1 can utilize the information recording in second (EID, RLOC) mapping table that the 3rd Bootstrap message is sent to ITR1.Afterwards, the each equipment by ITR1, the 3rd Bootstrap message being transmitted in the LISP network A at ITR1 place carries out the election of convergent point.
After above-mentioned processing, all-router in LISP network A and LISP network B all can be received the Bootstrap message from C-BSR3, and the information that can provide according to RP-Set, from numerous C-RP, be its corresponding RP:(a of specific multicast group selection according to following principle) first compare the class range that C-RP serves, the class range smaller who serves wins; (b) if the class range of service is identical, then compare the priority of C-RP, priority the higher person is won; (c) if priority is also identical, re-use Hash function and calculate hash value, the greater is won; (d), if hash value is also identical, IP address the greater of C-RP is won.According to above rule, the C-RP1 in LISP network A is by the RP being elected as in pim-sm domain.
After above-mentioned processing, in the time of a PIM SM territory of multiple LISP network composition, between multiple LISP networks across pim-sm domain, will elect BSR (being C-BSR3) and RP (being C-RP1), BSR based on electing and RP, can realize PIM SM protocol massages and cross over the transmission of LISP network, and can regard multiple independently LISP networks as a PIM SM territory, unified election BSR and RP, thereby for LISP multicast provides more selection scheme, and can in the situation that not knowing multicast source address, realize at ITR/ETR LISP multicast functionality, and can effectively support LISP network.
Electing BSR (being C-BSR3) and RP (being C-RP1) afterwards, for process for registering the multicast source, the method for realizing group broadcasting based on LISP proposing in the embodiment of the present invention can also comprise the following steps:
When multicast data message that step 1, the multicast source of tunnel router in the LISP network of receiving this tunnel router place send to convergent point, if convergent point is in the LISP at other tunnel router place network, utilize the second (EID, RLOC) multicast data message is sent to other tunnel router by the information recording in mapping table, by other tunnel router, multicast data message sent to convergent point.
Step 2, tunnel router, in the time receiving the multicast data message from multicast source that other tunnel router forwards, send to multicast data message the convergent point in the LISP network at this tunnel router place.
As shown in Figure 2, the multicast source of ITR1 in the LISP network A of receiving this ITR1 place to convergent point (C-RP1) send multicast data message time, because C-RP1 is in the LISP at this ITR1 place network A, therefore, ITR1 directly by multicast data packet forwarding to C-RP1, this process is same as the prior art, does not repeat them here.The multicast source of ETR1 in the LISP network B of receiving this ETR1 place to convergent point (C-RP1) send multicast data message time, because C-RP1 is in the LISP at ITR1 place network A, and the second (EID of ETR1, RLOC) EID in mapping table is the address information of the C-RP1 in the LISP network A at ITR1 place, RLOC is the address information of ITR1, therefore ETR1 can directly utilize the second (EID, RLOC) multicast data message is sent to ITR1 by the information recording in mapping table, and by ITR1 receive ETR1 forward the multicast data message from multicast source time, multicast data message is sent to the convergent point (C-RP1) in the LISP network A at this ITR1 place.
Wherein, in the time that the multicast source in LISP network B has sent a data message to multicast group G, the DR being connected with multicast source, receiving after this data message, is packaged into multicast data message, and sends to convergent point (C-RP1) by mode of unicast.First this multicast data message can be sent on ETR1, because C-RP1 is in the LISP at ITR1 place network A, and the object IP address of multicast data message is at the second (EID, RLOC) in mapping table, therefore ETR1 directly carries out LISP encapsulation to this multicast data message, and utilize the information recording in second (EID, RLOC) mapping table that multicast data message is sent to ITR1.ITR1 is receiving after multicast data message, and this multicast data message is carried out to LISP decapsulation, and with mode of unicast, multicast data message is sent to the C-RP1 in the LISP network A at ITR1 place.
Step 3, convergent point (being C-RP1) are being received after multicast data message, on the one hand decapsulation logon message will be encapsulated in multicast data message wherein along RPT ((Rendezvous Point Tree, shared tree)) be transmitted to recipient, sending (S, G) to multicast source direction hop-by-hop on the other hand joins message.
Step 4, convergent point to multicast source direction hop-by-hop send (S, G) while joining message, tunnel router receives the (S that convergent point returns, G) join message, and by (S, G) join message and send to other tunnel router, and joined message to multicast source forwarding (S, G) by other tunnel router.
As shown in Figure 2, send (S at convergent point (being C-RP1) to the multicast source direction hop-by-hop in LISP network B, G) while joining message, ITR1 is by (the S that receives that C-RP1 returns, G) join message, and to this (S, G) join message and carry out LISP encapsulation, and by (the S after LISP encapsulation, G) join message and send to ETR1, (S, G) after by ETR1, LISP being encapsulated joins message and carries out LISP decapsulation, and continue to join message to multicast source direction hop-by-hop transmission (S, G).Like this, from RP (being C-RP1) to multicast source the router of process just formed SPT ((Shortest Path Tree, shortest path tree) branch, these routers have all generated (S, G) list item in it is transmitted.SPT is taking the DR of multicast source as root, taking RP as leaf.Afterwards, the multicast data message that multicast source sends arrives C-RP1 along the SPT having established, and then by C-RP1, multicast data message is forwarded to recipient along RPT.When C-RP1 receives that, after the multicast data message that forwards along SPT, to sending stopped registration messages with the direct-connected DR of multicast source, process for registering the multicast source finishes by mode of unicast.
Electing BSR (being C-BSR3) and RP (being C-RP1) afterwards, taking Fig. 7 as example, the relevant treatment of RPT building process is described: (1) is in the time that Host C adds a multicast group G, first by IGMP (Internet Group Management Protocol, Internet igmpinternet)) its direct-connected DR of message notifying; (2) DR has grasped after the recipient information of multicast group G, sends and joins message to the RP direction hop-by-hop at this multicast group place; (3) from DR to RP the router of process just formed the branch of RPT, these routers have all generated (*, G) list item in it is transmitted, " * " here represents from any multicast source.RPT is taking RP as root, taking DR as leaf.When the multicast data message of multicast packet group G is during through RP, will arrive DR along the RPT having established, and then arrive recipient.
After electing BSR and RP, for datum plane, taking Fig. 8 as example, the relevant treatment of multicast data packet forwarding process is described: suppose that the multicast group that recipient adds is 232.1.1.1, the source IP address of multicast data message in a LISP network is 5.1.0.1, and object IP address is 232.1.1.1; The source IP address of multicast data message on public network is 10.0.0.1, and object IP address is 232.1.1.1; The source IP address of multicast data message in another LISP network is 5.1.0.1, and object IP address is 232.1.1.1.
The said method of the embodiment of the present invention describes as IPv4 network as example taking backbone network, and said method can also be applicable to the situation that backbone network is IPv6 network.In addition, the said method of the embodiment of the present invention describes as IPv4 network as example taking LISP network, and said method can also be applicable to the situation that LISP network is IPv6 network, now encapsulating compound mode has: tetra-kinds of LISP IPv4-in-IPv4, LISP IPv4-in-IPv6, LISP IPv6-in-IPv6 and LISP IPv6-in-IPv4.The said method of the embodiment of the present invention describes as example to dispose PIM-SM between multiple LISP networks, and said method can also be applicable to the situation of disposing PIM-SM between non-LISP network and LISP network.
Based on the inventive concept same with said method, the tunnel router of a kind of position-based and identity separated protocol LISP is also provided in the embodiment of the present invention, be applied in the network that comprises mapping server MS and multiple tunnel routers as shown in Figure 9, described tunnel router specifically comprises:
Sending module 11, for enabling after BootStrap Router BSR agent functionality, sends registration message to described MS, carries described tunnel router and enabled the information of BSR agent functionality in described registration message;
In the time of the first Bootstrap message of receiving from the candidate bsr in the LISP network at described tunnel router place, described the first Bootstrap message is sent to described MS;
In the time receiving the second Bootstrap message from other tunnel router that described MS forwards, to the second Bootstrap message described in the each device forwards in the LISP network at described tunnel router place;
Generation module 12, for in the time receiving described the second Bootstrap message, utilize the address information of carrying in described the second Bootstrap message to generate the first (end mark EID, route locating RLOC) mapping table, described EID is the address information of the candidate bsr in the LISP network at described other tunnel router place, and described RLOC is the address information of described other tunnel router.
Described sending module 11, while also declaring message for the candidate's convergent point in the LISP network of receiving described tunnel router place to first of BSR transmission, if described BSR is in the LISP at other tunnel router place network, utilize described the first (EID, RLOC) described the first declaration message is sent to other tunnel router by the information recording in mapping table, declares that message repeating is to BSR by described other tunnel router by described first; Receiving that other tunnel router utilizes described the first (EID, RLOC), when the second declaration message from candidate's convergent point that the information that records in mapping table forwards, described the second declaration message is sent to the BSR in the LISP network at this tunnel router place;
Described generation module 12, also for receiving that other tunnel router utilizes the first (EID, when what the information RLOC) recording in mapping table forwarded declares message from second of candidate's convergent point, utilize the address information of carrying in described the second declaration message to generate the second (EID, RLOC) mapping table, described the second (EID, RLOC) the described EID in mapping table is the address information of the candidate's convergent point in the LISP network at described other tunnel router place, and described RLOC is the address information of described other tunnel router.
Described sending module 11, also for when the 3rd Bootstrap message of receiving from the BSR in the LISP network at described tunnel router place, utilize the second (EID, RLOC) the 3rd Bootstrap message is sent to other tunnel router by the information recording in mapping table, and the each equipment by other tunnel router, described the 3rd Bootstrap message being transmitted in the LISP network at other tunnel router place carries out the election of convergent point.
Described sending module 11, also for the multicast source in the LISP network of receiving described tunnel router place to convergent point send multicast data message time, if convergent point is in the LISP at other tunnel router place network, utilize the second (EID, RLOC) described multicast data message is sent to other tunnel router by the information recording in mapping table, by other tunnel router, described multicast data message sent to convergent point; Receiving that other tunnel router utilizes the second (EID, RLOC) when the multicast data message from multicast source that the information that records in mapping table forwards, described multicast data message is sent to the convergent point in the LISP network at described tunnel router place, and receive (the S that described convergent point returns, G) join message, and by described (S, G) join message and send to described other tunnel router, and described in being forwarded to described multicast source by described other tunnel router, (S, G) joins message.
Wherein, the modules of apparatus of the present invention can be integrated in one, and also can separate deployment.Above-mentioned module can be merged into a module, also can further split into multiple submodules.
Based on the inventive concept same with said method, the mapping server MS of a kind of position-based and identity separated protocol LISP is also provided in the embodiment of the present invention, be applied in the network that comprises described MS and multiple tunnel routers, as shown in figure 10, described mapping server MS specifically comprises:
Receiver module 21, for receiving the registration message from tunnel router; Wherein, in described registration message, carried described tunnel router and enabled the information of BSR agent functionality; Memory module 22 in the time knowing that tunnel router has enabled BSR agent functionality, records the corresponding relation between the address information of tunnel router and the receiving interface of registration message in BSR mapping table; Sending module 23, for when the Bootstrap message of receiving from other tunnel router, utilizes the information recording in described BSR mapping table that described Bootstrap message is transmitted to tunnel router.
Wherein, the modules of apparatus of the present invention can be integrated in one, and also can separate deployment.Above-mentioned module can be merged into a module, also can further split into multiple submodules.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential general hardware platform by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in a storage medium, comprise that some instructions (can be personal computers in order to make a computer equipment, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into multiple submodules.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Disclosed is above only several specific embodiment of the present invention, and still, the present invention is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (10)
1. a method of realizing group broadcasting of position-based and identity separated protocol LISP, is applied in the network that comprises mapping server MS and multiple tunnel routers, it is characterized in that, described method comprises:
Tunnel router is enabling after BootStrap Router BSR agent functionality, sends registration message to described MS, carries described tunnel router and enabled the information of BSR agent functionality in described registration message;
Described tunnel router, in the time of the first Bootstrap message of receiving from the candidate bsr in the LISP network at this tunnel router place, sends to described MS by described the first Bootstrap message;
Described tunnel router receives the second Bootstrap message from other tunnel router that described MS forwards, utilize the address information of carrying in described the second Bootstrap message to generate the first (end mark EID, route locating RLOC) mapping table, and to the second Bootstrap message described in the each device forwards in the LISP network at described tunnel router place; Wherein, described EID is the address information of the candidate bsr in the LISP network at described other tunnel router place, and described RLOC is the address information of described other tunnel router.
2. the method for claim 1, is characterized in that, described tunnel router also comprises after utilizing address information generation first (EID, the RLOC) mapping table carrying in described the second Bootstrap message:
When the candidate convergent point of described tunnel router in the LISP network of receiving this tunnel router place declared message to first of BSR transmission, if BSR is in the LISP at other tunnel router place network, utilize the first (EID, RLOC) described the first declaration message is sent to other tunnel router by the information recording in mapping table, declares that message repeating is to BSR by other tunnel router by described first;
Described tunnel router is receiving that other tunnel router utilizes the first (EID, when what the information RLOC) recording in mapping table forwarded declares message from second of candidate's convergent point, utilize the address information of carrying in described the second declaration message to generate the second (EID, RLOC) mapping table, and described the second declaration message is sent to the BSR in the LISP network at this tunnel router place; Wherein, the described EID in described second (EID, RLOC) mapping table is the address information of the candidate's convergent point in the LISP network at described other tunnel router place, and described RLOC is the address information of described other tunnel router.
3. method as claimed in claim 2, is characterized in that, described tunnel router also comprises after utilizing address information generation second (EID, the RLOC) mapping table carrying in described the second declaration message:
Described tunnel router is in the time of the 3rd Bootstrap message of receiving from the BSR in the LISP network at this tunnel router place, utilize described the second (EID, RLOC) described the 3rd Bootstrap message is sent to other tunnel router by the information recording in mapping table, and the each equipment by other tunnel router, described the 3rd Bootstrap message being transmitted in the LISP network at other tunnel router place carries out the election of convergent point.
4. method as claimed in claim 2, is characterized in that, described tunnel router also comprises after utilizing address information generation second (EID, the RLOC) mapping table carrying in described the second declaration message:
The multicast source of described tunnel router in the LISP network of receiving this tunnel router place to convergent point send multicast data message time, if convergent point is in the LISP at other tunnel router place network, utilize the second (EID, RLOC) described multicast data message is sent to other tunnel router by the information recording in mapping table, by other tunnel router, described multicast data message sent to convergent point;
Described tunnel router is receiving that other tunnel router utilizes the second (EID, RLOC) when the multicast data message from multicast source that the information that records in mapping table forwards, described multicast data message is sent to the convergent point in the LISP network at this tunnel router place, and receive (the S that described convergent point returns, G) join message, and by described (S, G) join message and send to described other tunnel router, and described in being forwarded to described multicast source by described other tunnel router, (S, G) joins message.
5. a method of realizing group broadcasting of position-based and identity separated protocol LISP, is applied in the network that comprises mapping server MS and multiple tunnel routers, it is characterized in that, described method comprises:
Described MS receives the registration message from tunnel router; Wherein, in described registration message, carried described tunnel router and enabled the information of BSR agent functionality;
Described MS, in the time knowing that tunnel router has enabled BSR agent functionality, records the corresponding relation between the address information of described tunnel router and the receiving interface of described registration message in BSR mapping table;
Described MS receives the Bootstrap message from other tunnel router, and utilizes the information recording in described BSR mapping table that described Bootstrap message is transmitted to described tunnel router.
6. a tunnel router of position-based and identity separated protocol LISP, is applied in the network that comprises mapping server MS and multiple tunnel routers, it is characterized in that, described tunnel router comprises:
Sending module, for enabling after BootStrap Router BSR agent functionality, sends registration message to described MS, carries described tunnel router and enabled the information of BSR agent functionality in described registration message;
In the time of the first Bootstrap message of receiving from the candidate bsr in the LISP network at described tunnel router place, described the first Bootstrap message is sent to described MS;
In the time receiving the second Bootstrap message from other tunnel router that described MS forwards, to the second Bootstrap message described in the each device forwards in the LISP network at described tunnel router place;
Generation module, for in the time receiving described the second Bootstrap message, utilize the address information of carrying in described the second Bootstrap message to generate the first (end mark EID, route locating RLOC) mapping table, described EID is the address information of the candidate bsr in the LISP network at described other tunnel router place, and described RLOC is the address information of described other tunnel router.
7. tunnel router as claimed in claim 6, is characterized in that,
Described sending module, while also declaring message for the candidate's convergent point in the LISP network of receiving described tunnel router place to first of BSR transmission, if described BSR is in the LISP at other tunnel router place network, utilize described the first (EID, RLOC) described the first declaration message is sent to other tunnel router by the information recording in mapping table, declares that message repeating is to BSR by described other tunnel router by described first; Receiving that other tunnel router utilizes described the first (EID, RLOC), when the second declaration message from candidate's convergent point that the information that records in mapping table forwards, described the second declaration message is sent to the BSR in the LISP network at this tunnel router place;
Described generation module, also for receiving that other tunnel router utilizes the first (EID, when what the information RLOC) recording in mapping table forwarded declares message from second of candidate's convergent point, utilize the address information of carrying in described the second declaration message to generate the second (EID, RLOC) mapping table, described the second (EID, RLOC) the described EID in mapping table is the address information of the candidate's convergent point in the LISP network at described other tunnel router place, and described RLOC is the address information of described other tunnel router.
8. tunnel router as claimed in claim 7, is characterized in that,
Described sending module, also for when the 3rd Bootstrap message of receiving from the BSR in the LISP network at described tunnel router place, utilize the second (EID, RLOC) described the 3rd Bootstrap message is sent to other tunnel router by the information recording in mapping table, and the each equipment by other tunnel router, described the 3rd Bootstrap message being transmitted in the LISP network at other tunnel router place carries out the election of convergent point.
9. tunnel router as claimed in claim 7, is characterized in that,
Described sending module, also for the multicast source in the LISP network of receiving described tunnel router place to convergent point send multicast data message time, if convergent point is in the LISP at other tunnel router place network, utilize the second (EID, RLOC) described multicast data message is sent to other tunnel router by the information recording in mapping table, by other tunnel router, described multicast data message sent to convergent point; Receiving that other tunnel router utilizes the second (EID, RLOC) when the multicast data message from multicast source that the information that records in mapping table forwards, described multicast data message is sent to the convergent point in the LISP network at described tunnel router place, and receive (the S that described convergent point returns, G) join message, and by described (S, G) join message and send to described other tunnel router, and described in being forwarded to described multicast source by described other tunnel router, (S, G) joins message.
10. a mapping server MS of position-based and identity separated protocol LISP, is applied in the network that comprises described MS and multiple tunnel routers, it is characterized in that, described MS specifically comprises:
Receiver module, for receiving the registration message from tunnel router; Wherein, in described registration message, carried described tunnel router and enabled the information of BSR agent functionality;
Memory module in the time knowing that tunnel router has enabled BSR agent functionality, records the corresponding relation between the address information of tunnel router and the receiving interface of registration message in BSR mapping table;
Sending module, for when the Bootstrap message of receiving from other tunnel router, utilizes the information recording in described BSR mapping table that described Bootstrap message is transmitted to tunnel router.
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