CN100450096C - Method for determining converting state of end-to-end pseudo-line simulation node - Google Patents
Method for determining converting state of end-to-end pseudo-line simulation node Download PDFInfo
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- CN100450096C CN100450096C CNB2006100575894A CN200610057589A CN100450096C CN 100450096 C CN100450096 C CN 100450096C CN B2006100575894 A CNB2006100575894 A CN B2006100575894A CN 200610057589 A CN200610057589 A CN 200610057589A CN 100450096 C CN100450096 C CN 100450096C
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Abstract
The present invention provides a method for determining the converting state of an end-to-end pseudo line simulation node, which comprises the following steps that the end state of a node can be determined; the far end state of the node can be obtained; the converting state of the node can be determined by the end state and the far end state of the node. The present invention can determine the converting state of the node by the end state of the node and the far end state of the node which is connected with the node, and the converting state of the node can be simply and accurately determined. Because the far end state is considered when the converting state of the node is determined, the consistency of the converting state of all nodes in a pseudo line can be realized, namely that the state of a whole communication link can be known by a single node. The configuration and the inquiry of services are convenient. The present invention reduces the communication flow of state notice and the error rate, and is convenient for relevant control signaling, network management, charging processing, etc.
Description
Technical field
The present invention relates to the emulation technology in the communications field, relate in particular to a kind of method of definite converting state of end-to-end pseudo-line simulation node.
Background technology
Telecom operators are that the client provides two layers of link in the mode of lease special line (Leased Line) at first, but because this mode exists building time long, circuit can't be shared, cost an arm and a leg, be difficult to shortcomings such as management, it is many to be not suitable for branch, increase fast client, therefore along with ATM (Asynchronous TransportMode, asynchronous transfer mode) and FR (Frame Relay, frame relay) development of technology, telecom operators begin to adopt VC (Virtual Circuit, virtual circuit) mode provides two layers of link of point-to-point for the client, the client sets up the three-layer network of oneself thereon again with carrying IP (Internet Protocol, Internet protocol), IPX data flow such as (Internet Packet Exchange, ppp internetwork packet exchange control protocols).
Yet the virtual circuit mode provides VPN (VirtualPrivate Network, Virtual Private Network) professional and Internet business on different type network (as ATM, FR), and operator need build, safeguard multiple independently network, so cost is still higher; Another shortcoming of virtual circuit mode is that speed is slower, and configuration is complicated, and when increasing a website, the keeper need carry out a large amount of configuration efforts.
For remedying the deficiency of above technology, a kind ofly on IP network, provide the VPN service, can conveniently set arbitrary velocity, the simple technology of configuration is arisen at the historic moment, this technology is MPLS (Multiple Protocol LabelSwitch, multiprotocol label switching) VPN.This technology can provide IP service and two layers of three-layer VPN service simultaneously, can conveniently set arbitrary velocity, configuration simply on same network.Operator can provide services such as Best-effort (doing one's best) IP service, three-layer VPN, two-layer VPN, traffic engineering, Differentiated Services simultaneously on a kind of network, thereby greatly reduces networking, maintenance, operating cost.
Vpn service based on MPLS has two kinds, is respectively L3 (Layer 3) MPLS VPN and L2 (Layer 2) MPLS VPN.Wherein, the advantage of L2MPLS VPN is to avoid getting involved user's inside route level as L3 VPN, and operator does not need maintenance customer's routing iinformation.Along with the continuous development of this technology and application, produced PWE3 (Pseudo wire Emulation Edge-to-Edge, pseudo wire emulation end to end) business.PWE3 is exactly a kind of L2VPN technology, expands on the basis of the Martini of original L2VPN technology, has optimized LDP (Label Distribution Protocol, tag distribution protocol) signaling and has carried out mutual flow process.IETF (Internet Engineering Task Force, the Internet engineering duty group) describes new signaling process in detail in agreement draft-ietf-pwe3-control-protocol-17.txt, mainly be to have increased the Notification message; And in agreement draft-martini-pwe3-segmented-pw-00.txt at original SH-PW (Single-Hop PW, MH-PW (Multi-hop PW has been proposed on basis single-hop PW), multi-hop PW) notion has been described the signaling of pseudo-line exchange and the flow process of forwarding.
Pseudo-line switching technology has solved following three problems: (1) two service provider's edge device can be at different AS (Autonomous System, autonomous system) in the territory, (such as one is the MPLS network to the network type difference of (2) two service provider's edge devices, another is the L2TPv3 network), when (3) service provider's edge device performance can't satisfy the demands, under the situation of keeping pseudo-line invariable number, reduce the session number of carrier signaling, allow converging of pseudo-line move.Therefore, pseudo-line service is further expanded, and can stride different autonomous systems, can connect MPLS network and L2TPv3 network, to the performance requirement reduction of service provider's edge device.
Set up in the process at the PW of PWE3, realize forwarding information is assigned on the corresponding PW node by the LDP signaling protocol.The LDP of PWE3 realizes having two kinds of single-hop and multi-hops.Mainly described when handling the exchange of MPLS control plane the processing procedure of LDP signaling message at draft-ietf-pwe3-segmented-pw-00, wherein mentioned use Notification or Mapping/Release and transmitted forwarding state.
Yet, can only could determine by the management equipment of this node of login for the forwarding state of node in the prior art, can not determine the forwarding state of this node according to the port status of the port status of node itself and adjacent node.
In addition, because can not easy definite node forwarding state in the prior art, more do not require all node forwarding state consistency, therefore, in the product of different companies is realized, have the correct and inconsistent phenomenon of each node forwarding state of Signalling exchange.For example, comprise A, B, four nodes of C, D in the system, the forwarding state of four nodes is inconsistent, wherein B is for transmitting, and A, C and D node are for transmitting, will be when A sends to D as a business, actual in B can not transmit and can not realize, but because A and not knowing, therefore receive in the same old way and send this business, the result causes this business can't arrive D, has only login D could confirm service condition, influence fault inquiry and location, under the situation of chargeing, be easy to generate wrong metering data.
Summary of the invention
The problem to be solved in the present invention provides a kind of method of definite converting state of end-to-end pseudo-line simulation node, after solving the configuration of prior art pseudo-line service, and can not the easy defective of accurately determining the node forwarding state.
In order to address the above problem, the invention provides a kind of method of definite converting state of end-to-end pseudo-line simulation node, may further comprise the steps:
A, the local terminal node state of determining this node according to the connecting circuit state and the local terminal tunnel state of node;
B, obtain the adjacent node state of this node;
C, the forwarding state of determining this node according to the local terminal node state and the adjacent node state of this node.
The connecting circuit of this node is UP and local terminal tunnel when being UP, and the local terminal node state of this node is for transmitting.
Described adjacent node state is announced by signaling message.
Described signaling message is the amplifying message MAPPING or the NOTIFICATION of the tag distribution protocol in the Pseudo Wire Emulation Edge-to-Edge signaling.
Local terminal node state and adjacent node state according to this node determine that the forwarding state of this node is specially: when the local terminal node state of this node for can transmit and the adjacent node state for can transmit the time, determine that then the forwarding state of this node is for transmitting.
Described node comprises beginning or end, or middle switching node.
For middle switching node, the connecting circuit state is obtained by the local terminal node state of this centre switching node one side and the adjacent node state equivalence of this side.
In the middle of described the local terminal tunnel state of switching node one side be the adjacent node state of UP and this side for can transmit the time, described connecting circuit state is UP.
Compared with prior art, the present invention has the following advantages:
The local terminal node state of the present invention by node and the adjacent node state of the node that links to each other with this node are determined the forwarding state of this node, can be easy and determine the forwarding state of node exactly; And, owing to considered the adjacent node state during forwarding state of definite node, can realize the forwarding state consistency of all nodes in the pseudo-line, promptly can understand the state of whole communication link by single node, make things convenient for business configuration and inquiry, reduced the communication flows of state advertisement and reduced error rate, can conveniently be correlated with control signaling (as the masterslave switchover under many business), webmaster and charging processing etc.
Description of drawings
Fig. 1 is the flow chart that the present invention determines the method for converting state of end-to-end pseudo-line simulation node;
Fig. 2 is the conforming system construction drawing of a kind of Pseudo Wire Emulation Edge-to-Edge single-hop of the present invention forwarding state;
Fig. 3 is the conforming system construction drawing of a kind of Pseudo Wire Emulation Edge-to-Edge multi-hop of the present invention forwarding state;
Fig. 4 is the equivalent structure figure of middle switching node among Fig. 3.
Embodiment
The method flow of a kind of definite converting state of end-to-end pseudo-line simulation node of the present invention may further comprise the steps as shown in Figure 1:
Step s101 determines the local terminal state of node.Wherein, the local terminal state is by the connecting circuit of this node and the decision of local terminal tunnel state, that is: when connecting circuit be UP (existence) and local terminal tunnel when being UP (existence), the local terminal state of this node is for transmitting; When one of them did not exist when the connecting circuit of this node or local terminal tunnel, the local terminal state of this node was for transmitting.
Step s102 obtains the far-end state of this node.This far-end state transmits by the MAPPING/NOTIFICATION message of LDP signaling expansion.
Step s103, the forwarding state of determining this node according to the local terminal state and the far-end state of this node.When the local terminal state of this node for can transmit and the far-end state for can transmit the time, the forwarding state of this node is for transmitting; When the local terminal state of this node or far-end state one of them for can not transmit the time, the forwarding state of this node is for transmitting.
In the method for above-mentioned definite converting state of end-to-end pseudo-line simulation node, end-to-end pseudo-line simulation node comprises: single-hop node and multi-hop node, described single-hop node is a beginning or end, the promptly middle switching node of described multi-hop node.Respectively beginning or end and two kinds of situations of middle switching node are illustrated below:
For beginning or end: at first judge the connecting circuit state and the local terminal tunnel state of this beginning or end, if connecting circuit state and local terminal tunnel state all are UP (existence), then the local terminal state of this beginning or end is for transmitting; Request, Mapping, Notification, Release and Withdraw message by the expansion of LDP signaling obtains the far-end state then, when the local terminal state of beginning or end for can transmit and the far-end state for can transmit the time, the forwarding state of this beginning or end is for transmitting.
For middle switching node: at first, be connecting circuit state under the single-hop node mode with the far-end state equivalence of the local terminal tunnel state of middle switching node one side and this side; Then, the local terminal state of determining this centre switching node according to the equivalent connecting circuit and the opposite side local terminal tunnel state of this centre switching node one side: if when the equivalent connecting circuit of this centre switching node one side and opposite side local terminal tunnel state are UP (existence), the local terminal state of this side of this centre switching node is for transmitting, wherein, if and only if this side tunnel effectively and the far-end state of this side for can transmit the time, this side equivalence connecting circuit is UP; At last, determine the forwarding state of this centre switching node according to the local terminal state of this centre switching node and corresponding far-end state: the local terminal state of middle switching node one side is for transmitting, and corresponding far-end state is for can transmit the time, and the forwarding state of this centre switching node is for transmitting.For example, if the local terminal of this centre switching node one side (A side) equivalence connecting circuit is that UP and opposite side (B side) tunnel are UP, this side (B side) far-end state is can transmit the time simultaneously, and then the forwarding state of this node is for transmitting.
In addition, implement the forwarding state that method of the present invention is determined each node, can realize all node forwarding state consistency in the pseudo-line by each node on pseudo-line.
Starting point in the Pseudo Wire Emulation Edge-to-Edge, terminal point or arbitrary in the middle of switching node be can not transmit the time because of condition changing makes forwarding state, forwarding state notifying mechanism according to forwarding state pass through mechanism and signaling, all node states are and can not transmit on the pseudo-line, thereby realize end-to-end pseudo-line forwarding state consistency.Wherein, the forwarding state of pseudo-line node sends to management equipment by message or the node basis is worked as precondition, automatically become and to transmit during as the signaling session failed, all need be during the variation of arbitrary node forwarding state by above-mentioned signaling mechanism to the adjacent node transmission, thus each node state finally is consistent.
When above-mentioned implementation is applied to have only the system of two single-hop nodes (starting point and terminal point), as shown in Figure 2, the local terminal state of determining starting point UPE1 by connecting circuit and the local tunnel state of starting point UPE1, starting point UPE1 is by the far-end state of far-end information acquisition terminal point UPE2, when the far-end state of the local terminal state of starting point UPE1 and terminal point UPE2 all is can transmit the time, the forwarding state of starting point UPE1 is for transmitting; In like manner, when the far-end state of the local terminal state of terminal point UPE2 and starting point UPE1 all is can transmit the time, the forwarding state of terminal point UPE2 is for transmitting.When starting point UPE1 or terminal point UPE2 one of them for can not transmit the time, according to the forwarding state propagation function of LDP signaling, all node states are and can not transmit on the pseudo-line; All recover just often when starting point UPE1 and terminal point UPE2 forwarding state, according to the forwarding state propagation function of LDP signaling, then the state of each node becomes all and can transmit.
When such scheme is applied to comprise the system of starting point, terminal point and at least one middle switching node, as shown in Figure 3 and Figure 4, because there is not connecting circuit in switching node in the middle of the pseudo-line, and switching node realizes that adjacent two PW sections link to each other respectively, therefore have the single-hop of being different from node (UPE) on handling in the middle of the pseudo-line.When handling the signaling of middle switching node A side, the equivalence of B side is formed equivalent connecting circuit for AC; When if the equivalent connecting circuit of this centre switching node B side and A side local terminal tunnel state are UP (existence), the local terminal state of the A side of this centre switching node is for transmitting, wherein, and if only if B side tunnel effectively and the far-end state of B side for can transmit the time, B side equivalence connecting circuit is UP.When the local terminal state of middle switching node A side for transmitting, and the far-end state of A side be for can transmit the time, the forwarding state of this centre switching node A side is for transmitting; In like manner, when the local terminal state of middle switching node B side for transmitting, and the far-end state of B side be for can transmit the time, the forwarding state of this centre switching node B side is for transmitting; When the forwarding state of the A of middle switching node side and B side all is can transmit the time, the forwarding state of this centre switching node is for transmitting.When starting point UPE1, terminal point UPE2 or middle switching node SPE one of them for can not transmit the time, according to the forwarding state propagation function of LDP signaling, all node states are and can not transmit on the pseudo-line; All recover just often when starting point UPE1, terminal point UPE2 or middle switching node SPE forwarding state, according to the forwarding state propagation function of LDP signaling, then the state of each node becomes all and can transmit.
In addition, in the Pseudo Wire Emulation Edge-to-Edge, when an end tunnel from the nothing of becoming is arranged, perhaps becoming from nothing has, if the far-end of this end exists and can transmit, then equivalent process is the AC state variation of node opposite side; When the far-end state variation of an end or when existing situation to change, there is the tunnel in this end, and then also equivalent process is the AC state variation of opposite side.
The present invention not only is used for the LDP signaling process status of processes consistency problem of PWE3, also be applicable to satisfy and realize the forwarding state consistency with LDP PWE3 condition similar communication system, such as, support state advertisement signaling between two-way link and support node, these signalings can be standard or privately owned.
The above only is a preferred implementation 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 (8)
1, a kind of method of definite converting state of end-to-end pseudo-line simulation node is characterized in that, may further comprise the steps:
The local terminal node state of determining this node according to the connecting circuit state and the local terminal tunnel state of node;
Obtain the adjacent node state of this node;
The forwarding state of determining this node according to the local terminal node state and the adjacent node state of this node.
2, determine the method for converting state of end-to-end pseudo-line simulation node according to claim 1, it is characterized in that the connecting circuit of this node is UP and local terminal tunnel when being UP, the local terminal node state of this node is for transmitting.
3, determine the method for converting state of end-to-end pseudo-line simulation node according to claim 1, it is characterized in that described adjacent node state is announced by signaling message.
4, as the method for definite converting state of end-to-end pseudo-line simulation node as described in the claim 3, it is characterized in that described signaling message is the amplifying message MAPPING or the NOTIFICATION of the tag distribution protocol in the Pseudo Wire Emulation Edge-to-Edge signaling.
5, determine the method for converting state of end-to-end pseudo-line simulation node according to claim 1, it is characterized in that, described local terminal node state and adjacent node state according to this node determines that the forwarding state of this node is specially: when the local terminal node state of this node for can transmit and the adjacent node state for can transmit the time, determine that then the forwarding state of this node is for transmitting.
6, determine the method for converting state of end-to-end pseudo-line simulation node according to claim 1, it is characterized in that described node comprises beginning or end, or middle switching node.
7, as the method for definite converting state of end-to-end pseudo-line simulation node as described in the claim 6, it is characterized in that, when described node was middle switching node, described connecting circuit state was obtained by the local terminal tunnel state of this centre switching node one side and the adjacent node state equivalence of this side.
8, as the method for definite converting state of end-to-end pseudo-line simulation node as described in the claim 7, it is characterized in that, in the middle of described the local terminal tunnel state of switching node one side be the adjacent node state of UP and this side for can transmit the time, described connecting circuit state is UP.
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| CN1625176A (en) * | 2003-12-03 | 2005-06-08 | 华为技术有限公司 | Realization method of edge to edge pseudo-line simulation protocol |
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| CN1722726A (en) * | 2004-07-12 | 2006-01-18 | 中兴通讯股份有限公司 | Layer-2 VPN equipment supporting pseudo line tag reflection and networking method |
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| CN1714544A (en) * | 2002-11-21 | 2005-12-28 | 思科技术公司 | System and method for interconnecting heterogeneous layer 2 VPN applications |
| CN1625176A (en) * | 2003-12-03 | 2005-06-08 | 华为技术有限公司 | Realization method of edge to edge pseudo-line simulation protocol |
| CN1722726A (en) * | 2004-07-12 | 2006-01-18 | 中兴通讯股份有限公司 | Layer-2 VPN equipment supporting pseudo line tag reflection and networking method |
Non-Patent Citations (4)
| Title |
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| 分层VPLS模型中PW的创建和维护. 刘峰，朱恒晔，崔子筠.微机发展，第16卷第2期. 2006 |
| 分层VPLS模型中PW的创建和维护. 刘峰，朱恒晔，崔子筠.微机发展，第16卷第2期. 2006 * |
| 边缘到边缘的伪线仿真（PWE3）：1. 框架结构. 李朝举.中国数据通信，第5期. 2003 |
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Effective date of registration: 20221019 Address after: No. 1899 Xiyuan Avenue, high tech Zone (West District), Chengdu, Sichuan 610041 Patentee after: Chengdu Huawei Technologies Co.,Ltd. Address before: 518129 Bantian HUAWEI headquarters office building, Longgang District, Guangdong, Shenzhen Patentee before: HUAWEI TECHNOLOGIES Co.,Ltd. |
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