CN104135423B - A kind of bidirectional tunnel method for building up and device - Google Patents
A kind of bidirectional tunnel method for building up and device Download PDFInfo
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- CN104135423B CN104135423B CN201410413449.0A CN201410413449A CN104135423B CN 104135423 B CN104135423 B CN 104135423B CN 201410413449 A CN201410413449 A CN 201410413449A CN 104135423 B CN104135423 B CN 104135423B
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Abstract
The invention provides a kind of bidirectional tunnel method for building up, this method includes：When the destination node that node receives source node transmission is the PATH of this node, reserving message is sent to the source node；And to the source node transmitting path message, the PATH that the node is sent carries IP address of the PATH institute through interface received, so that reverse path of the PATH of node transmission along the node RX path message is sent to the source node；The node establishes reverse tunnel when receiving the source node in the reserving message sent after receiving the PATH of this node transmission according to the reserving message received.Based on same inventive concept, the application also proposes that a kind of bidirectional tunnel establishes device, in the case where keeping forward and reverse tunnel consistent, the foundation of simple realization bidirectional tunnel.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of bidirectional tunnel method for building up and device.
Background technology
Network congestion is to influence the subject matter of backbone network performance.The reason for congestion is probably Internet resources deficiency,
Local congestion caused by possible network resource loads are unbalanced.Traffic engineering (Traffic Engineering, TE) solve be
Due to congestion caused by load imbalance.Multiprotocol label switching (Multiprotocol Label Switching, MPLS) TE
MPLS technology and traffic engineering are combined, resource reservation is carried out by the lsp tunnel for being established to specified path, makes network traffics
Congested node is got around, reaches the purpose of balance network traffic.
MPLS traffic engineering tunnels transmit tunnel as the packet of MPLS- tranmission techniques framework (Transport Profile, TP),
Need to realize bidirectional tunnel function, to support 1:1 and 1+1 protection switch, carrying MPLS transmission required for operation, management and dimension
Protect (Operations, Administration and Maintenance, OAM) and guard mode coordinates (Protection
State Coordination, PSC) etc. with interior detection instrument and signaling.
MPLS TE bidirectional tunnels establish mode at present, and route of such as accompanying (Co-routed) mode is specific as follows：
RSVP (Resource Reservation Protocol, RSVP)-TE agreements are extended, led to
Cross RSVP-TE signaling protocols and establish MPLS TE bidirectional tunnels, i.e., the label that passage path (path) message distributes upstream LSR
Downstream LSR is advertised to, the CRLSP in a direction is established during PATH transmission, then by reserving (Resv) message
The LSR labels distributed in downstream are advertised to upstream LSR, the CRLSP in another direction is established during reserving message transmission.
The positive and negative both direction CRLSP for the MPLS TE bidirectional tunnels that Co-routed modes are established uses identical path.
Co-route modes need to carry out expansion modification to basic RSVP message (path message), realize it is relative complex,
Need all intermediate nodes to support Co-routed modes bidirectional tunnel to establish, have to the node selection in network higher
It is required that network design is limited to a certain extent.
The content of the invention
In view of this, the application provides a kind of bidirectional tunnel method for building up and device, is answered to solve both sides' tunnel building
The problem of miscellaneous.
In order to solve the above technical problems, what the technical scheme of the application was realized in：
A kind of bidirectional tunnel method for building up, applied on the node in multiprotocol label switching MPLS network, methods described
Including：
When the destination node that the node receives source node transmission is the PATH of this node, sent out to the source node
Reserving message is sent, to establish positive tunnel；
For the node to the source node transmitting path message, the PATH that the node is sent carries the road received
Footpath message the Internet protocol IP address through interface so that the PATH that the node is sent is along the node RX path
The reverse path of message is sent to the source node；
The node receive the source node sent after the PATH of this node transmission is received it is reserved
During message, reverse tunnel is established according to the reserving message received.
A kind of bidirectional tunnel establishes device, applied on the node in multiprotocol label switching MPLS network, described device
Including：Receiving unit, transmitting element and establish unit；
The receiving unit, for RX path message, receive reserving message；
The transmitting element, the destination node for receiving source node transmission when the receiving unit are the road of this node
During the message of footpath, reserving message is sent to the source node, to establish positive tunnel；And to the source node transmitting path message,
The PATH that the node is sent carry the PATH that receives the Internet protocol IP address through interface so that described
Reverse path of the PATH that node is sent along the node RX path message is sent to the source node；
It is described to establish unit, for receiving the road of this node transmission when the receiving unit receives the source node
During the reserving message sent after the message of footpath, reverse tunnel is established according to the reserving message received.
In summary, the application in PATH by the basis of original RSVP messages are not changed, i.e., not carrying
On the basis of the label of upstream LSR distribution, reverse tunnel is established according to the information in positive tunnel, so as to keep forward and reverse tunnel
In the case of consistent, the foundation of simple realization bidirectional tunnel.
Brief description of the drawings
Fig. 1 is the schematic flow sheet in the path that bidirectional tunnel is established in selection in the embodiment of the present application；
Fig. 2 is MPLS network schematic diagram；
Fig. 3 is the processing procedure schematic flow sheet of destination node during bidirectional tunnel foundation in the embodiment of the present application；
Fig. 4 is the tunnel building apparatus structure schematic diagram for being applied to above-mentioned technology in the application specific embodiment.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and according to embodiment,
Technical scheme is described in detail.
Before the application implements bidirectional tunnel foundation, it need to first determine establish bidirectional tunnel using any paths.Specifically
The node for establishing bidirectional tunnel is needed to calculate the road that this node establishes bidirectional tunnel to destination node when realizing, in MPLS network
Footpath, and along the path that calculates to the destination node transmitting path message；The path calculated all meets constraint to be forward and reverse
The optimal path of forward path in the path of condition.
The node calculates the path that this node establishes bidirectional tunnel to destination node, specifically includes：
The node calculates this node to all forward paths for meeting constraints of destination node；
Optimal path in the forward path that node selection calculates, according to traffic engineering database (TEDB) information
With the information acquisition reverse path of the forward path, and determine whether reverse path meets constraints, if it is, determining the road
Footpath is the path that this node establishes bidirectional tunnel to destination node；Otherwise, sub-optimal path is selected in the forward path calculated,
And determine whether the sub-optimal path is path that this node establishes bidirectional tunnel to destination node.
Below in conjunction with the accompanying drawings, the process that the path of bidirectional tunnel is established in selection is described in detail：
Referring to Fig. 1, Fig. 1 is the schematic flow sheet in the path that bidirectional tunnel is established in selection in the embodiment of the present application.Specific step
Suddenly it is：
Step 101, node calculates all forward paths for meeting constraints to destination node, and by each forward direction
Path and its corresponding priority binding storage.
Referring to Fig. 2, Fig. 2 is MPLS network schematic diagram.In Fig. 2, node A calculates expiring to node D according to TEDB information
All forward paths of sufficient constraints, and each forward path and its corresponding priority are stored, it is specially：Path
A-B-D, priority value 1；Path A-C-D, priority value 2.
Step 102, the node determines whether to store the forward path that this node arrives destination node, if it is, performing step
103；Otherwise, step 106 is performed.
In this step, the node determines whether to have calculated the forward path that this node arrives destination node, in Fig. 2, i.e.,
Determine that node A to node D whether there is path that is reachable and meeting constraints.
Step 103, the node selects currently stored optimal forward path, according to TEDB information and the forward path
Information acquisition reverse path, and determine whether reverse path meets constraints, if it is, performing step 105；Otherwise, perform
Step 104.
Step 104, the currently stored optimal forward path of the knot removal and corresponding priority, step 102 is performed.
Step 105, the node carries out the foundation of bidirectional tunnel to the destination node transmitting path message.
Step 106, this flow is terminated.
Calculate in fig. 2 and store two paths, it is assumed that path A-B-D priority is high, and its reverse path meets
Constraints, then establish bidirectional tunnel on the paths；Assuming that path A-B-D priority is high, and its reverse path is discontented with
Sufficient constraints, then delete the path A-B-D of storage, then determines the path A-C-D of currently stored highest priority, and its is anti-
Whether meet constraints to path, if it is, establishing bidirectional tunnel on the A-C-D of the path；Otherwise, this flow is terminated.
Below in conjunction with the accompanying drawings, the process that bidirectional tunnel is established is described in detail.
Referring to Fig. 3, Fig. 3 is that the processing procedure flow of destination node during bidirectional tunnel foundation in the embodiment of the present application is shown
It is intended to.Concretely comprise the following steps：
Step 301, when the destination node that node receives source node transmission is the PATH of this node, saved to the source
Point sends reserving message, to establish positive tunnel.
This node is when receiving PATH, according to route display object (the Explicit Route of PATH
Object, ERO) address information in object, determine this node whether be the PATH destination node, compared with realization.
The PATH that source node is sent in the present embodiment, without any extension, does not carry label information.The node exists
When receiving PATH, itself is determined after purpose node, to send reserving message to source node, being carried in the reserving message
The label of this node distribution, the foundation in tunnel is carried out in the transmittance process of reserving message, disappeared when source node receives this and reserved
During breath, source node establishes positive tunnel according to the reserving message.
Step 302, the node carries the PATH received to the source node transmitting path message, the PATH
The IP address through interface so that the node send PATH along the node RX path message reverse path hair
Give the source node.
When the application implements, the node also triggers PATH when receiving the PATH of source node transmission
Transmission.
The node send PATH carry receive PATH institute the IP address through interface be connect from this node
In record routing object (Record Route Object, RRO) object of the PATH received, inverted sequence extracts the section
The PATH that receives of point the IP address through interface.
The node by inverted sequence extract PATH that this node receives the IP address through interface carry in this node
In the ERO of the PATH of transmission, to indicate the transmission path of the PATH.
The PATH that the node is sent is realized without any extension, does not also carry label.
Step 303, the node receive source node receive this node transmission PATH after send it is pre-
When staying message, reverse tunnel is established according to the reserving message received.
The node is received in the reserving message of source node transmission, carries the label of source node distribution.
Below still by taking Fig. 2 as an example, the process that bidirectional tunnel is established between source node and destination node is described in detail.
Assuming that by path computing above, it is determined that establishing bidirectional tunnel on the A-B-D of path, process is specifically established such as
Under：
The first step, node A is to node D transmitting path message, the interface IP address that is carried in the ERO of the PATH, according to
The secondary interface B1 for node B IP address (IPB1), node B interface B2 IP address (IPB2), node D interface D1 IP
Address (IPD1)；Node A interface A1 IP address (IPA1) is recorded in RRO.
Second step, when Node-B receiver is to the PATH, the address information in ERO determines that the PATH needs to send out
When sending node D, IPB1, and IPB2 are recorded after the IPA1 recorded in RRO, and the PATH after renewal is sent to node
D。
3rd step, when node D receives the PATH, the address information in the ERO of PATH determines the road
The destination node of footpath message is this node, then sends reserving message to node A；And send PATH.
Node D carries the label of node D distribution when sending reserving message to node A.
The information that node D is carried in the ERO of the PATH sent to node A is true according to the PATH received
It is fixed, be specially：IP address in the RRO for the PATH that node D is received is (IPA1, IPB1, IPB2), and inverted sequence, which extracts, to be connect
IP address in the RRO of the PATH received is (IPB2, IPB1, IPA1), and by inverted sequence extraction each IP address (IPB2,
IPB1, IPA1) according to extraction order add node D into the ERO of the node A PATHs sent, so as to receive the road
The node of footpath message knows the routing information of each jump of the PATH.
During specific implementation, IPD1 can not be also recorded in the RRO that node D receives PATH and the PATH
When, carry out inverted sequence extraction IP address, such as implementation given above；It can also increase in the RRO of the PATH of reception
After IPD1, then inverted sequence extraction, so simply to be extracted a local ip address, being deleted in the IP address reversely extracted should more
IP address, have no effect on the IP address that node D carries into the ERO of the node A PATHs sent.
4th step, when Node-B receiver is sent to node A reserving message to node D, after locally respective handling is carried out,
Reserving message after being handled to node A transmissions；When receiving node D and being sent to node A PATH, locally carry out it is corresponding
After processing, the PATH after being handled to node A transmissions.
Node-B receiver is to reserving message and PATH, the respective handling of progress, compared with realization, here no longer one by one
Description.
5th step, node A receive the reserving message of node D transmissions, establish the positive tunnel to node D；Receive section
The PATH that point D is sent, reserving message is sent to node D.
Node A carries the label of node A distribution when sending reserving message to node D.
6th step, node A issue node D, specific transmission process co-occurrence to the reserving message that node D is sent by node B
There is realization.
7th step, node D receive the reserving message of node A transmissions, establish node A to node D reverse tunnel, extremely
This, bidirectional tunnel, which is established, to be completed.
Described in the present embodiment is the foundation of a bidirectional tunnel, is every when when establishing of a plurality of bidirectional tunnel be present
Bar tunnel distributing Tunnel Identifier, to distinguish different tunnels.
Based on same inventive concept, the application also proposes that a kind of bidirectional tunnel establishes device, applied in MPLS network
Node on.Referring to Fig. 4, Fig. 4 is that the tunnel building apparatus structure for being applied to above-mentioned technology in the application specific embodiment is illustrated
Figure.The device includes：Receiving unit 401, transmitting element 402 and establish unit 403；
Receiving unit 401, for RX path message, receive reserving message；
Transmitting element 402, the destination node for receiving source node transmission when receiving unit 401 are the path of this node
During message, reserving message is sent to the source node, to establish positive tunnel；And to the source node transmitting path message, institute
State node transmission PATH carry receive PATH institute the IP address through interface so that the node transmission road
Reverse path of the footpath message along the node RX path message is sent to the source node；
Unit 403 is established, for receiving the path of this node transmission when receiving unit 401 receives the source node
During the reserving message sent after message, reverse tunnel is established according to the reserving message received.
It is preferred that
Carried in the route display object ERO for the PATH that the node is sent, from the path that the node receives
In the RRO of message, PATH that the node that inverted sequence extracts receives the IP address through interface.
It is preferred that described device further comprises：Computing unit 404；
Computing unit 404, the path of bidirectional tunnel is established for calculating this node to destination node, and trigger transmitting element
402 along the path that calculates to the destination node transmitting path message；The path is forward and reverse path for all meeting constraints
The optimal path of middle forward path.
It is preferred that
Computing unit 404, specifically for calculating this node to all positive roads for meeting constraints of destination node
Footpath；Optimal path in the forward path that selection calculates, according to traffic engineering database TEDB information and the forward path
Information acquisition reverse path, and determine whether reverse path meets constraints, if it is, determining that the path is arrived for this node
Destination node establishes the path of bidirectional tunnel；Otherwise, sub-optimal path is selected in the forward path calculated, and determines the suboptimum
Whether path is path that this node establishes bidirectional tunnel to destination node.
The unit of above-described embodiment can be integrated in one, and can also be deployed separately；A unit is can be merged into, also may be used
To be further split into multiple subelements.
In summary, the application in PATH by the basis of original RSVP messages are not changed, i.e., not carrying
On the basis of the label of upstream LSR distribution, reverse tunnel is established according to the information in positive tunnel, so as to keep forward and reverse tunnel
In the case of consistent, the foundation of simple realization bidirectional tunnel.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements done etc., should be included within the scope of protection of the invention with principle.
Claims (8)
- A kind of 1. bidirectional tunnel method for building up, applied on the node in multiprotocol label switching MPLS network, it is characterised in that Methods described includes：When the destination node that the node receives source node transmission is the PATH of this node, sent to the source node pre- Message is stayed, to establish positive tunnel；Wherein, the label of this node distribution is carried in the reserving message；To the source node transmitting path message, the PATH that the node is sent carries the path received and disappeared the node Internet protocol IP address of the breath institute through interface, so that the PATH of node transmission is along the node RX path message Reverse path be sent to the source node；The node is receiving the reserving message of source node transmission after the PATH of this node transmission is received When, reverse tunnel is established according to the reserving message received.
- 2. according to the method for claim 1, it is characterised in that the PATH that the node is sent carries the road received Footpath message the IP address through interface, including：Carried in the route display object ERO for the PATH that the node is sent, the PATH received from the node Record routing object RRO in, PATH that the node that inverted sequence extracts receives the IP address through interface.
- 3. method according to claim 1 or 2, it is characterised in that methods described further comprises：Node in the MPLS network is when needing to establish the node of bidirectional tunnel, and it is double to destination node foundation to calculate this node To the path in tunnel, and along the path calculated to the destination node transmitting path message；The path all meets about to be forward and reverse The optimal path of forward path in the path of beam condition.
- 4. according to the method for claim 3, it is characterised in that described this node that calculates establishes two-way tunnel to destination node The path in road, including：The node calculates this node to all forward paths for meeting constraints of destination node；Optimal path, according to traffic engineering database TEDB information and is somebody's turn to do in the forward path that the node selection calculates The information acquisition reverse path of forward path, and determine whether reverse path meets constraints, if it is, determining that the path is This node establishes the path of bidirectional tunnel to destination node；Otherwise, sub-optimal path is selected in the forward path calculated, and really Whether the fixed sub-optimal path is path that this node establishes bidirectional tunnel to destination node.
- 5. a kind of bidirectional tunnel establishes device, applied on the node in multiprotocol label switching MPLS network, it is characterised in that Described device includes：Receiving unit, transmitting element and establish unit；The receiving unit, for RX path message, receive reserving message；The transmitting element, the destination node for receiving source node transmission when the receiving unit disappear for the path of this node During breath, reserving message is sent to the source node, to establish positive tunnel；Wherein, this node point is carried in the reserving message The label matched somebody with somebody；And to the source node transmitting path message, the PATH that the node is sent carries the path received and disappeared Internet protocol IP address of the breath institute through interface, so that the PATH of node transmission is along the node RX path message Reverse path be sent to the source node；It is described to establish unit, for disappearing when the receiving unit receives the source node in the path for receiving the transmission of this node During the reserving message sent after breath, reverse tunnel is established according to the reserving message received.
- 6. device according to claim 5, it is characterised in thatCarried in the route display object ERO for the PATH that the node is sent, the PATH received from the node Record routing object RRO in, PATH that the node that inverted sequence extracts receives the IP address through interface.
- 7. the device according to claim 5 or 6, it is characterised in that described device further comprises：Computing unit；The computing unit, the path of bidirectional tunnel is established for calculating this node to destination node, and trigger it is described send it is single Member is along the path that calculates to the destination node transmitting path message；The path all meets in the path of constraints to be forward and reverse The optimal path of forward path；Wherein, described node is to need to need to establish the node of bidirectional tunnel in the MPLS network.
- 8. device according to claim 7, it is characterised in thatThe computing unit, specifically for calculating this node to all forward paths for meeting constraints of destination node； Optimal path in the forward path that selection calculates, according to traffic engineering database TEDB information and the letter of the forward path Breath obtains reverse path, and determines whether reverse path meets constraints, if it is, determining that purpose is arrived in the path for this node Node establishes the path of bidirectional tunnel；Otherwise, sub-optimal path is selected in the forward path calculated, and determines the sub-optimal path Whether it is path that this node establishes bidirectional tunnel to destination node.
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| CN201410413449.0A CN104135423B (en) | 2014-08-21 | 2014-08-21 | A kind of bidirectional tunnel method for building up and device |
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| US10560367B2 (en) * | 2016-01-18 | 2020-02-11 | Nokia Of America Corporation | Bidirectional constrained path search |
| CN106656802B (en) * | 2016-12-21 | 2019-06-21 | 北京格林伟迪科技股份有限公司 | A kind of end-to-end tunnel generation method |
| CN107682259A (en) * | 2017-10-24 | 2018-02-09 | 新华三技术有限公司 | Method for searching and device |
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| CN101577657A (en) * | 2008-05-08 | 2009-11-11 | 华为技术有限公司 | Method of tunnel establishment and system for realizing tunnel establishment |
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| CN102724117A (en) * | 2012-06-06 | 2012-10-10 | 华为技术有限公司 | Multi-protocol label switching (MPLS) traffic engineering (TE) tunnel building method and device |
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| US20060018255A1 (en) * | 2004-07-26 | 2006-01-26 | Avaya Technology Corp. | Defining a static path through a communications network to provide wiretap law compliance |
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| CN101001102A (en) * | 2007-01-10 | 2007-07-18 | 北京航空航天大学 | Route device and method for raising service quality of space information network |
| CN101577657A (en) * | 2008-05-08 | 2009-11-11 | 华为技术有限公司 | Method of tunnel establishment and system for realizing tunnel establishment |
| CN101945049A (en) * | 2010-09-20 | 2011-01-12 | 中兴通讯股份有限公司 | Multi-protocol label switching system, node equipment and establishing method of bidirectional tunnel |
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