CN100555989C - A kind of implementation method of point to multi-point pseudowire - Google Patents
A kind of implementation method of point to multi-point pseudowire Download PDFInfo
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- CN100555989C CN100555989C CN200610033286.9A CN200610033286A CN100555989C CN 100555989 C CN100555989 C CN 100555989C CN 200610033286 A CN200610033286 A CN 200610033286A CN 100555989 C CN100555989 C CN 100555989C
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Abstract
A kind of implementation method of point to multi-point pseudowire, this method comprises: the root of the inlet network boundary router of multicast service as point to multi-point pseudowire is set, and the outlet network boundary router of multicast service is as the leaf of point to multi-point pseudowire; Leaf request root suggestion label, in process by root suggestion label, the ability of being supported as this point to multi-point pseudowire with the ability of root, desire is added the ability that ability that the leaf of described point to multi-point pseudowire supports and root support to be compared, determine that can this leaf add described point to multi-point pseudowire, make the label unanimity of all leaves that add this point to multi-point pseudowire.The present invention has solved the problem that realizes P2MP PW in the PWE3 field by using the LDP signaling, for realizing that simulation points provides method to the unidirectional multicast service of multiple spot on the packet switching network.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the implementation method of a kind of point to multi-point pseudowire (Point toMultiPoint Pseudo Wire---P2MP PW).
Background technology
The pseudo wire emulation of the edge-to-edge that IETF tissue (Internet Engineering Task Force---the Internet engineering duty group) proposes (Pseudo Wire EmulationEdge-to-Edge---PWE3) be a kind of packet switching network (Packet SwitchedNetwork---PSN) go up the mechanism of the various point to point service, PTP of simulation, the business that simulated can be TDM special line, ATM, FR or Ethernet etc.PWE3 utilizes the tunneling mechanism on the PSN to simulate a kind of necessary attribute of business, and the tunnel here is called pseudo-line (PW).PWE3 can (Protocol Data Unit---PDU) encapsulate, PDU contains necessary data of emulation special services and control information in the inside to the protocol Data Unit of special services.Use PWE3 mechanism, operator can transfer to all transport services among the network (as IP/MPLS) of a fusion.From user's angle, can think that the pseudo-line of PWE3 simulation is a kind of link or circuit of special use.
At present, at the PWE3 of IETF working group draft
In " draft-ietf-pwe3-control-protocol-17 ", the LDP of MPLS (MultipleProtocol Label Switch---multiprotocol label switching) (Label DistributeProtocol---tag distribution protocol) signaling is expanded, and described the signaling process process of using LDP to set up and safeguard P2P PW in detail.Defined two kinds of FEC (Forwarding Equivalence Class---forwarding equivalence class) element in this draft, FEC 128PWid (Pseudo Wire Identifier---pseudo-line identifier) is with PW ID (Pseudo WireIdentifier---pseudo-line identifier) two-way PW of sign, FEC 129GPWid (Generalized Pseudo Wire Identifier---general pseudo-line identifier) is with two-way PW of (the attached identifier in SAISource Attachment Identifier-source, the attached identifier of TAI Target AttachmentIdentifier-target) sign.Fig. 1 has described and has used FEC 129 to set up the process of P2P PW: PE1 sends foundation from Label Mapping message initiation PW to PE2, after PE2 receives Label Mapping message, the PW FEC that carries in the detect-message compares the TAI value of wherein carrying with the Forwarder (transponder) of this locality; If PE2 find one can with the corresponding transponder of TAI value, PE2 sends Label Mapping message to PE1 and sets up reverse PW, two-way PW successfully sets up, otherwise PW sets up failure.Set up at PW and to carry out the PW state in the process simultaneously and consult, if initiation is set up in the Label Mapping message of PW and is carried PW state TLV (Type-Length-Value---the coding of " type-length-value " form), then express support for and use PW state TLV, if the Label Mapping that far-end sends does not carry PW state TLV, then PW does not support the use of PW state TLV.PW sets up the negotiation that process is also carried out control word, and as if the tenability unanimity of two PE to control word, then PW normally sets up; Otherwise an end reduces ability with reach an agreement (promptly not supporting control word)." draft-ietf-pwe3-control-protocol-17 " draft has only proposed solution to the foundation of P2P PW, can not realize foundation and the maintenance of P2MP PW.
At the MPLS of IETF (Multiple Protocol Label Switch---multiprotocol label switching) working group's draft
In " draft-yasukawa-mpls-ldp-mcast-over-p2mp-lsps-01 ", the scheme of P2MP MPLS-TE LSP carrying multicast LDP LSP (Label Switched Path, label switched path) has been proposed.By P2MP TE (Traffic Engineering---traffic engineering) LSP duplicate packet, all next jumping LSR (Label Switched Router, LSR) receives identical duplicate packet, next jumps LSR to the identical label of same multicast stream use in order to guarantee each, has proposed the upper tag proposed projects.As shown in Figure 2, a downstream LSR that add multicast stream upstream LSR send the Label Mapping message of carrying special tag.After upstream LSR received this message, LSR sent Label Request message suggestion label downstream.Downstream LSR is if accept the label of upstream LSR suggestion, and the LabelMapping message that this label is carried in LSR response upstream confirms to accept the label that upstream LSR advises; If do not receive the label of suggestion, send Notification message; All are added the downstream LSR of this multicast stream, the label that LSR suggestion in upstream is identical.Should only propose solution by " draft-yasukawa-mpls-ldp-mcast-over-p2mp-lsps-01 " draft, can not realize foundation and the maintenance of P2MP PW in the PWE3 field at the P2MP TE LSP carrying P2MP LDP LSP in MPLS field.
Summary of the invention
Technical problem to be solved by this invention is: realize P2MP PW in PWE3 (Pseudo Wire EmulationEdge-to-Edge---the pseudo wire emulation of edge-to-edge) field.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
A kind of implementation method of point to multi-point pseudowire, this method comprises: the root of the inlet network boundary router of multicast service as point to multi-point pseudowire is set, and the outlet network boundary router of multicast service is as the leaf of point to multi-point pseudowire; Leaf request root suggestion label, in process by root suggestion label, the ability of being supported as this point to multi-point pseudowire with the ability of root, desire is added the ability that ability that the leaf of described point to multi-point pseudowire supports and root support to be compared, determine that can this leaf add described point to multi-point pseudowire, and make the label unanimity of all leaves that add this point to multi-point pseudowire;
Describedly desire added the ability that ability that the leaf of point to multi-point pseudowire supports and root support compare, determine that can this leaf add described point to multi-point pseudowire and comprise:
The ability of this leaf and root relatively, when this leaf can be supported the ability that all roots are supported, and when root can be advised label, root sends the message of suggestion label to leaf, accepted the label of root suggestion when this leaf, the ability of this leaf adjustment self also sends the affirmation message of the label that accepts a proposal to root, and this leaf successfully adds described point to multi-point pseudowire; Otherwise root sends the message that discharges label to leaf, and leaf can not add this point to multi-point pseudowire.
The implementation method of another kind of point to multi-point pseudowire, this method comprises: the root of the inlet network boundary router of multicast service as point to multi-point pseudowire is set, the outlet network boundary router of multicast service is initiated the foundation of point to multi-point pseudowire as the leaf of point to multi-point pseudowire by leaf; With the label of first leaf distribution that successfully adds this point to multi-point pseudowire as the label of this point to multi-point pseudowire, the ability that the ability of described first leaf is supported as this point to multi-point pseudowire and root; Add the follow-up leaf of described point to multi-point pseudowire for desire, relatively its ability of supporting and the described ability of being supported are determined that can described follow-up leaf add described point to multi-point pseudowire, and are made the label unanimity of all leaves that add this point to multi-point pseudowire;
Describedly add the follow-up leaf of described point to multi-point pseudowire for desire, relatively its ability of supporting and the described ability of being supported, determine that can described follow-up leaf add described point to multi-point pseudowire and comprise:
The ability of follow-up leaf and root, when this follow-up leaf can be supported the ability that all roots are supported, and when root can be advised label, root sends the message of suggestion label to follow-up leaf, accepted the label of root suggestion when follow-up leaf, the ability of this follow-up leaf adjustment self also sends the affirmation message of the label that accepts a proposal to root, and this follow-up leaf successfully adds described point to multi-point pseudowire; Otherwise root sends the message that discharges label to follow-up leaf, and follow-up leaf can not add this point to multi-point pseudowire.
Beneficial effect of the present invention is: the present invention has solved the problem that realizes P2MP PW in the PWE3 field by using the LDP signaling, for realizing that simulation points provides method to the unidirectional multicast service of multiple spot on the packet switching network.
Description of drawings
Fig. 1 uses FEC 129 for prior art and sets up the process schematic diagram of P2P PW;
Fig. 2 is the signaling procedure schematic diagram of prior art upper tag suggestion;
Fig. 3 sets up the schematic diagram of P2MP PW for first kind of scheme of the present invention;
Fig. 4 is first kind of scheme flow chart of the present invention;
Fig. 5 sets up the schematic diagram of P2MP PW for second kind of scheme of the present invention;
Fig. 6 is second kind of scheme flow chart of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
The present invention adopts two kinds of relevant methods, realizes P2MP PW in the PWE3 field.When CE need insert multicast service (as IPTV, DVB etc.),, promptly initiate the foundation of P2MP PW by the foundation that coupled PE initiates multicast tree.Two kinds of methods all are provided with the root of the entry PE of multicast service as P2MP PW, and outlet PE is initiated the foundation of P2MP PW as the leaf of P2MP PW by leaf; Different is that first method is to a P2MP PW, by root suggestion label, the ability that the ability of root is supported as this P2MP PW.For the leaf that will add this P2MP PW, relatively the ability supported of the ability supported of this leaf and root determines that can this leaf add, and makes the label unanimity of all leaves that add this P2MP PW.And second method, different to first leaf that will add P2MP PW with the processing method of the follow-up leaf that will add P2MP PW, be with the label of first leaf that successfully adds distribution label, the ability that the ability of the leaf that first successfully adds is supported as this P2MP PW (comprising root) as this P2MP PW; Has same characteristic features for the follow-up processing method and the first method that will add the leaf of P2MP PW, promptly for the follow-up leaf that will add this P2MP PW, the ability supported of the ability supported of this leaf and first leaf that successfully adds (just root support ability) relatively, determine that can this leaf add, make the label unanimity of all leaves that add this P2MP PW.
Referring to Fig. 3, Fig. 4, as follows for the specific descriptions of first method:
1, to add the LabelMapping message of the leaf PE2 of P2MP PW to root PE1 transmission request suggestion label, carry the P2MPPW FEC of a P2MP PW of unique identification in this Label Mapping message, the special tags value of expression request root PE1 suggestion label, and ability information such as status signaling, control word support.Wherein, P2MP PW FEC has two kinds of elements optional: a kind of P2MPPWid of being for all preallocated PW ID of leaf that will add certain P2MP PW, is used for P2MP PW of unique identification; Another kind is P2MP GPWid, and all will add the leaf of certain P2MP PW will know the TAI value corresponding with certain transponder of root, promptly passes through P2MP PW of certain TAI unique identification of root.
2, after root PE1 receives Label Mapping message, detect the P2MP PW FEC that it carries, and the ability that the ability of root is supported as P2MP PW; Wherein:
● when P2MP PW FEC is P2MP PWid, or when finding the Forwarder corresponding during for P2MP GPWid, divide following two kinds of different situations to handle with TAI:
1) if leaf can prop root support have the ability, and root can be advised label, then root PE1 sends the Label Request message of advising label to leaf PE2, carries the PW label of corresponding P2MP PW FEC and suggestion in this message, and the ability information of self; If root can not or be reluctant to send the LabelRelease message that discharges label by the suggestion label, carry corresponding P2MP PW FEC in this message; This leaf can not add P2MP PW;
2) if some ability that leaf can not prop root, then root sends Label Release message, and this leaf can't add P2MP PW.
● do not find the Forwarder corresponding with TAI when P2MP PW FEC is P2MP GPWid, then sends Label Release message, this leaf can't add P2MP PW.
3, the label that accepts a proposal of leaf PE2, and adjust the ability of leaf PE2 self according to the ability information that the Label Request message that root sends is carried, send the affirmation message Label Mapping message of the label that accepts a proposal to root PE1.Carry the label of corresponding P2MP PW FEC and suggestion in this message, and the ability information identical with root, leaf PE2 successfully adds among the P2MP PW; Otherwise leaf PE2 sends and informs Notification message, informs the label that root does not accept a proposal, and this leaf PE2 can't add P2MP PW.
4, all leaves that add this P2MP PW are handled identically with said process, and advise identical label by root.
Referring to Fig. 5, Fig. 6, as follows for the specific descriptions of second method:
1, to add the LabelMapping message of the leaf PE2 of P2MP PW to root PE1 transmission request suggestion label, carry the P2MPPW FEC of a P2MP PW of unique identification in this Label Mapping message, expression needs the special tags value of root PE1 suggestion label, and ability information such as status signaling, control word support.Wherein, P2MP PW FEC has two kinds of elements optional: a kind of P2MPPWid of being for all preallocated PW ID of leaf that will add certain P2MP PW, is used for P2MP PW of unique identification; Another kind is P2MP GPWid, and all will add the leaf of certain P2MP PW will know the TAI value corresponding with certain transponder of root, promptly passes through P2MP PW of certain TAI unique identification of root.
2, after root PE1 receives Label Mapping message, detect the P2MP PW FEC that it carries, wherein:
● when P2MP PW FEC is P2MP PWid, or when finding the Forwarder corresponding during for P2MP GPWid, divide following two kinds of different situations to handle with TAI:
A, if root PE1 receive this P2MP PW FEC for the first time, then with the label that carries in the Label Mapping message label as this P2MP PW, with the ability that the ability of this leaf PE2 is supported as P2MP PW (comprising root), P2MP PW successfully sets up, and this leaf PE2 adds P2MP PW; If root PE1 can not support some ability that leaf is supported, then root sends Label Release message, and this leaf PE2 can't add P2MP PW.
B, if root PE1 had received this P2MP PW FEC, then the ability that desire is added the follow-up leaf PE4 of P2MP PW and root compares and judges:
1) if this leaf PE4 can prop root PE1 support have the ability, it is the ability that first leaf PE2 that successfully adds supports, and root can be advised label, then root PE1 sends Label Request message to leaf PE4, carry the PW label (label of this P2MP PW) of corresponding P2MP PW FEC and suggestion in this message, and the ability information of root; If root can not or be reluctant to send Label Release message by the suggestion label, carry corresponding P2MP PW FEC in this message; This leaf can not add P2MP PW;
2) if some ability that leaf PE4 can not prop root PE1, then root sends Label Release message, and this leaf PE4 can't add P2MP PW.
● do not find the Forwarder corresponding with TAI when P2MP PW FEC is P2MP GPWid, then sends Label Release message, this leaf can't add P2MP PW.
3, leaf PE4 receives the label of suggestion, adjust the ability of self according to its ability information of carrying, send the affirmation message Label Mapping message of the label that accepts a proposal to root PE1, carry the label of corresponding P2MP PW FEC and suggestion in this message, and the ability information consistent with root PE1, leaf PE4 successfully adds among the P2MP PW; Otherwise leaf sends Notification message, informs the label that root does not accept a proposal.
4, the processing of the leaf of this P2MP PW of follow-up adding is identical with the process of leaf PE4, and by the identical label of root suggestion.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (6)
1, a kind of implementation method of point to multi-point pseudowire, this method comprises: the root of the inlet network boundary router of multicast service as point to multi-point pseudowire is set, and the outlet network boundary router of multicast service is as the leaf of point to multi-point pseudowire; Leaf request root suggestion label, in process by root suggestion label, the ability of being supported as this point to multi-point pseudowire with the ability of root, desire is added the ability that ability that the leaf of described point to multi-point pseudowire supports and root support to be compared, determine that can this leaf add described point to multi-point pseudowire, and make the label unanimity of all leaves that add this point to multi-point pseudowire;
Describedly desire added the ability that ability that the leaf of point to multi-point pseudowire supports and root support compare, determine that can this leaf add described point to multi-point pseudowire and comprise:
The ability of this leaf and root relatively, when this leaf can be supported the ability that all roots are supported, and when root can be advised label, root sends the message of suggestion label to leaf, accepted the label of root suggestion when this leaf, the ability of this leaf adjustment self also sends the affirmation message of the label that accepts a proposal to root, and this leaf successfully adds described point to multi-point pseudowire; Otherwise root sends the message that discharges label to leaf, and leaf can not add this point to multi-point pseudowire.
2, method according to claim 1 is characterized in that: described method comprises following concrete steps:
The Ye Xianggen that A, desire add described point to multi-point pseudowire sends the message that label is advised in request, carries the point to multi-point pseudowire forwarding equivalence class in this message;
B, root detect the point to multi-point pseudowire forwarding equivalence class that described request suggestion tag message is carried, when described point to multi-point pseudowire forwarding equivalence class is the point to multi-point pseudowire identifier, or find and the corresponding transponder of the attached identifier of target during to the general pseudo-line identifier of multiple spot for point, carry out step C; Otherwise root sends the message that discharges label to leaf, and leaf can not add this point to multi-point pseudowire;
C, the ability of this leaf and root relatively, when this leaf can be supported the ability that all roots are supported, and root be can advise label the time, root sends the message of suggestion label to leaf, carries out step D; Otherwise root sends the message that discharges label to leaf, and leaf can not add this point to multi-point pseudowire;
D, accepted the label of root suggestion when this leaf, the ability of this leaf adjustment self also sends the affirmation message of the label that accepts a proposal to root, and this leaf successfully adds described point to multi-point pseudowire; Otherwise leaf sends and informs message, informs the label that root does not accept a proposal, and this leaf can't add described point to multi-point pseudowire.
3, method according to claim 2, it is characterized in that: the described point to multi-point pseudowire forwarding equivalence class of described steps A is used for point to multi-point pseudowire of unique identification, comprises special tags value, status signaling and the control word tenability information of request root suggestion label; Carry the identical point to multi-point pseudowire forwarding equivalence class and the pseudo line tag of suggestion in the message of the label of suggestion described in the described step C, and the ability information of root self; The label that carries identical point to multi-point pseudowire forwarding equivalence class in the described acknowledge message of described step D and advise, and the ability information identical with root by root.
4, a kind of implementation method of point to multi-point pseudowire, this method comprises: the root of the inlet network boundary router of multicast service as point to multi-point pseudowire is set, the outlet network boundary router of multicast service is initiated the foundation of point to multi-point pseudowire as the leaf of point to multi-point pseudowire by leaf; With the label of first leaf distribution that successfully adds this point to multi-point pseudowire as the label of this point to multi-point pseudowire, the ability that the ability of described first leaf is supported as this point to multi-point pseudowire and root; Add the follow-up leaf of described point to multi-point pseudowire for desire, relatively its ability of supporting and the described ability of being supported are determined that can described follow-up leaf add described point to multi-point pseudowire, and are made the label unanimity of all leaves that add this point to multi-point pseudowire;
Describedly add the follow-up leaf of described point to multi-point pseudowire for desire, relatively its ability of supporting and the described ability of being supported, determine that can described follow-up leaf add described point to multi-point pseudowire and comprise:
The ability of follow-up leaf and root, when this follow-up leaf can be supported the ability that all roots are supported, and when root can be advised label, root sends the message of suggestion label to follow-up leaf, accepted the label of root suggestion when follow-up leaf, the ability of this follow-up leaf adjustment self also sends the affirmation message of the label that accepts a proposal to root, and this follow-up leaf successfully adds described point to multi-point pseudowire; Otherwise root sends the message that discharges label to follow-up leaf, and follow-up leaf can not add this point to multi-point pseudowire.
5, method according to claim 4 is characterized in that: described method comprises following concrete steps:
The Ye Xianggen that A, desire add described point to multi-point pseudowire sends the message that label is advised in request, carries the point to multi-point pseudowire forwarding equivalence class in this message;
B, root detect the point to multi-point pseudowire forwarding equivalence class that described request suggestion tag message is carried, when described point to multi-point pseudowire forwarding equivalence class is the point to multi-point pseudowire identifier, or find and the corresponding transponder of the attached identifier of target during to the general pseudo-line identifier of multiple spot for point, carry out step C; Otherwise root sends the message that discharges label to leaf, and leaf can not add this point to multi-point pseudowire;
C, root judge whether to receive this point to multi-point pseudowire forwarding equivalence class for the first time, if received this point to multi-point pseudowire forwarding equivalence class, carry out step e;
If D receives this point to multi-point pseudowire forwarding equivalence class for the first time, and root can be supported the ability of this leaf, then the label that this leaf is distributed is as the label of this point to multi-point pseudowire, the ability that the ability of this leaf is supported as this point to multi-point pseudowire and root, this leaf is as first leaf that successfully adds this point to multi-point pseudowire;
The ability of E, follow-up leaf and root, when this follow-up leaf can be supported the ability that all roots are supported, and root be can advise label the time, root sends the message of suggestion label to follow-up leaf, carries out step F; Otherwise root sends the message that discharges label to follow-up leaf, and follow-up leaf can not add this point to multi-point pseudowire;
F, accepted the label of root suggestion when follow-up leaf, the ability of this follow-up leaf adjustment self also sends the affirmation message of the label that accepts a proposal to root, and this follow-up leaf successfully adds described point to multi-point pseudowire; Otherwise follow-up leaf sends and informs message, informs the label that root does not accept a proposal, and this follow-up leaf can't add described point to multi-point pseudowire.
6, method according to claim 5, it is characterized in that: the described point to multi-point pseudowire forwarding equivalence class of described steps A is used for point to multi-point pseudowire of unique identification, comprises special tags value, status signaling and the control word tenability information of request root suggestion label; Carry the identical point to multi-point pseudowire forwarding equivalence class and the pseudo line tag of suggestion in the message of the label of suggestion described in the described step e, and the ability information of root self; The label that carries identical point to multi-point pseudowire forwarding equivalence class in the described acknowledge message of described step F and advise, and the ability information identical with root by root.
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| CN101931563A (en) * | 2009-06-23 | 2010-12-29 | 中国移动通信集团公司 | Label checking method and system |
| ES2531546T3 (en) * | 2009-06-29 | 2015-03-17 | Huawei Technologies Co., Ltd. | Apparatus and method to establish a so-called pseudo-conductor |
| CN102148745B (en) | 2010-02-08 | 2014-03-12 | 中兴通讯股份有限公司 | Method and system for increasing forwarding efficiency of virtual private LAN service network |
| CN102263668A (en) * | 2011-08-25 | 2011-11-30 | 福建星网锐捷网络有限公司 | Method, system and device for realizing one-way pseudowire circuit in MPLS (multi-protocol label switching) network |
| CN105591771A (en) * | 2014-10-22 | 2016-05-18 | 中兴通讯股份有限公司 | Ethernet service configuration method and apparatus |
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Granted publication date: 20091028 Termination date: 20180120 |