CN102123088B - Set up the method and apparatus of traffic engineering tunnel - Google Patents
Set up the method and apparatus of traffic engineering tunnel Download PDFInfo
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Abstract
The invention discloses a kind of method and apparatus setting up traffic engineering tunnel, the method comprises: mutual receiving-transmitting chain state message between routing device and neighboring routing device, carries the field of the RSVP-TE configuration attribute for identifying link in this Link State Packet; Described routing device is collected the link-state information in MPLS network according to described Link State Packet and is formed TEDB; Described routing device runs CSPF algorithm, and in described TEDB, option and installment has the link of RSVP-TE agreement; Described routing device is according to the link establishment traffic engineering tunnel selected.In the present invention, when there is equal-cost link in an mpls network, still normally can set up traffic engineering tunnel.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of method and apparatus setting up traffic engineering tunnel.
Background technology
In current Internet network, network congestion is the subject matter affecting backbone network performance.TE (Traffic Engineering, traffic engineering) is a kind of technical scheme solving network congestion.In order to disposing flux engineering in large-scale backbone network, MPLS (Multi-Protocol Label Switching, multiprotocol label switching) TE is widely used.
In existing MPLS network, in every platform equipment contribution link TE relevant information and generate TEDB (TE Data Base, TE database).CSPF (Constrained Shortest Path First, constraint formula OSPF) shears the link in TEDB, the link not meeting TE attribute specification is cut, finds a shortest path.When there being many paths to identical destination, or when there is many equal-cost links, CSPF does not calculate all optimal paths of destination, but only calculates an optimal path.The routing rule of CSPF algorithm is: select the path that cost (cost) is lower; When cost is identical, select the path that the value of minimum available bandwidth is maximum; If still remain two with upper pathway, select the path (namely in path, the number of router is minimum) with minimum hop count; If still remain two with upper pathway, then Stochastic choice one paths.The failure that the method that this Stochastic choice one paths carries out traffic engineering tunnel foundation can cause tunnel to be set up.
Summary of the invention
The invention provides a kind of method and apparatus setting up traffic engineering tunnel, when there is equal-cost link in an mpls network, still normally can set up traffic engineering tunnel.
The invention provides a kind of method setting up traffic engineering tunnel, be applied to the routing device of MPLS network, the method comprises:
Mutual receiving-transmitting chain state message between described routing device and neighboring routing device, carries the field of the RSVP-TE configuration attribute for identifying link in this Link State Packet;
Described routing device is collected the link-state information in MPLS network according to described Link State Packet and is formed TEDB;
Described routing device runs CSPF algorithm, and in described TEDB, option and installment has the link of RSVP-TE agreement;
Described routing device is according to the link establishment traffic engineering tunnel selected.
Described routing device is collected the link-state information in MPLS network according to described Link State Packet and is formed TEDB and comprises:
Described routing device obtains the RSVP-TE configuration attribute of link according to described Link State Packet, and in described TEDB, store the RSVP-TE configuration attribute of link.
Described Link State Packet is specially the OSPF message or ISIS message with TE extended attribute.
When described Link State Packet is the OSPF message with TE extended attribute, the sub-TLV that the field of the described RSVP-TE configuration attribute for identifying link increases under being specially the link information field in the MPLS TE LSA field of OSPF message;
When described Link State Packet is the ISIS message with TE extended attribute, the field of the described RSVP-TE configuration attribute for identifying link is specially the sub-TLV increased in The Extended IS Reachability TLV.
Described in described TEDB option and installment have the link of RSVP-TE agreement to comprise:
Select the link that cost is minimum; When there being more than two link costs identical, select the link that the value of minimum available bandwidth is maximum; If remain two with uplink, select the link with minimum hop count; If still remain two with uplink, option and installment has the link of RSVP-TE agreement; If still remain two with uplink, then a Stochastic choice wherein link;
Or
Option and installment has the link of RSVP-TE agreement; When have selected two with uplink time, from these two with the link selecting cost minimum uplink; When there being more than two link costs identical, select the link that the value of minimum available bandwidth is maximum; If still remain two with uplink, select the link with minimum hop count; If still remain two with uplink, then a Stochastic choice wherein link.
A kind of routing device, is applied to MPLS network, comprises:
Transmit-Receive Unit, for receiving-transmitting chain state message mutual between neighboring routing device, carries the field of the RSVP-TE configuration attribute for identifying link in this Link State Packet;
Link State collector unit, collects the link-state information in MPLS network for the Link State Packet received according to described Transmit-Receive Unit and forms TEDB;
Path-calculating element, for running CSPF algorithm, in described TEDB, option and installment has the link establishment traffic engineering tunnel of RSVP-TE agreement;
Unit is set up in tunnel, for the link establishment traffic engineering tunnel selected according to described path-calculating element.
Described Link State collector unit also for:
Obtain the RSVP-TE configuration attribute of link according to described Link State Packet, and in described TEDB, store the RSVP-TE configuration attribute of link.
Described Link State Packet is specially the OSPF message or ISIS message with TE extended attribute.
When described Link State Packet is the OSPF message with TE extended attribute, the sub-TLV that the field of the described RSVP-TE configuration attribute for identifying link increases under being specially the link information field in the MPLS TE LSA field of OSPF message;
When described Link State Packet is the ISIS message with TE extended attribute, the field of the described RSVP-TE configuration attribute for identifying link is specially the sub-TLV increased in The Extended IS Reachability TLV.
Described path-calculating element also for:
Select the link that cost is minimum; When there being more than two link costs identical, select the link that the value of minimum available bandwidth is maximum; If remain two with uplink, select the link with minimum hop count; If still remain two with uplink, option and installment has the link of RSVP-TE agreement; If still remain two with uplink, then a Stochastic choice wherein link;
Or
Option and installment has the link of RSVP-TE agreement; When have selected two with uplink time, from these two with the link selecting cost minimum uplink; When there being more than two link costs identical, select the link that the value of minimum available bandwidth is maximum; If still remain two with uplink, select the link with minimum hop count; If still remain two with uplink, then a Stochastic choice wherein link.
Compared with prior art, the present invention at least has the following advantages:
In the present invention, routing device in MPLS network receives and dispatches the Link State Packet of the field of the RSVP-TE configuration attribute carried for identifying link mutually, know the RSVP-TE attribute of link, and then use CSPF algorithms selection interface configuration to have the link establishment traffic engineering tunnel of RSVP-TE agreement, ensure still can set up traffic engineering tunnel when there is equal-cost link.
Accompanying drawing explanation
Fig. 1 is that in prior art, traffic engineering tunnel sets up mode schematic diagram;
Fig. 2 is the structural representation with the OSPF message of TE extended attribute provided by the invention;
Fig. 3 is the schematic flow sheet setting up the method for traffic engineering tunnel provided by the invention;
Fig. 4 is the structural representation with the ISIS message of TE extended attribute provided by the invention;
Fig. 5 is that the Type value of ISIS message provided by the invention distributes schematic diagram;
Fig. 6 is the structural representation setting up the equipment of traffic engineering tunnel provided by the invention.
Embodiment
In the present invention, the routing device in MPLS network passes through the mutual link exchange state information of Link State Packet, comprising the RSVP-TE configuration attribute of LI(link interface).Routing device generates TEDB according to the information collected.When routing device initiates to set up traffic engineering tunnel, CSPF shears the link in the TEDB of routing device, and option interface is configured with the link establishment traffic engineering tunnel of RSVP-TE agreement.
Each routing device in above-mentioned MPLS network configures OSPF (Open Shortest Path First, ospf) agreement or ISIS (linking status Routing Protocol), accordingly, above-mentioned Link State Packet is specially the OSPF message with TE extended attribute or the ISIS message with TE extended attribute, and each routing device has OSPF message or the ISIS message of TE extended attribute according to the ospf protocol of configuration or the transmitting-receiving of ISIS agreement.
Introduce the method setting up traffic engineering tunnel when Link State Packet is OSPF message or the ISIS message with TE extended attribute below respectively.
Have the structure of the OSPF message of TE extended attribute as shown in Figure 2, wherein, the TLV of Opaque LSA comprises MPLS TE LSA field, and MPLS TE LSA field mainly comprises linkinformation (link information) field.Link information field comprises link local interface IP address (Local Interface IP address), link opposite end interface IP address (Remote Interface IPaddress) and other TLV and sub-TLV field etc.In the present invention, in order to when ensureing to there is equal-cost link, traffic engineering tunnel can normally be set up, in the link information field of MPLS TE LSA, add sub-TLV field for judging whether the interface of link is configured with RSVP-TE agreement.Each sub-TLV in linkinformation field has respective Type value, span is 1-65535, wherein the value of 1-32767 is that standard is effective, the sub-Types value that sub-TLV in existing Link TLV fixes use is 1 to 9, therefore, the span of the Type of the sub-TLV increased in the present invention is 10-32767.Below for the Type value 32767 of the sub-TLV increased.
Routing device in MPLS network fills the property value of each field in the above-mentioned OSPF message carrying the sub-TLV of increase according to the Link State of self, and mutually sends the OSPF message carrying the sub-TLV of increase.Wherein, when self LI(link interface) is configured with RSVP-TE agreement, the Type value of the sub-TLV of increase is 32767.
Each network equipment forms TEDB according to the Link State in the OSPF message collection network received.When routing device initiates to set up traffic engineering tunnel, this routing device runs CSPF as traffic engineering tunnel head node equipment, calculates the link of the traffic engineering tunnel arriving tunnel tail node according to the link-state information collected.Tunnel head node equipment selects especially by following manner the link setting up traffic engineering tunnel in the multilink arriving tunnel tail node:
Select the link that cost (cost) is lower; When cost is identical, select the link that the value of minimum available bandwidth is maximum; If still remain two with uplink, select the link (namely in link, the number of router is minimum) with minimum hop count; If still remain two with uplink, then option interface is all configured with the link of RSVP-TE agreement; If still remain two with uplink, then a Stochastic choice wherein link;
Or
Option interface is all configured with the link of RSVP-TE agreement; The link that cost (cost) is lower is selected from residue link; When cost is identical, select the link that the value of minimum available bandwidth is maximum; If still remain two with uplink, select the link with minimum hop count; If still remain two with uplink, then Stochastic choice wherein.
Below in conjunction with embody rule scene, introduce the method setting up traffic engineering tunnel provided by the invention.
For scene shown in Fig. 1, set up a traffic engineering tunnel from Router A to Router C, between RouterB and Router C, there are two equal-cost links.Link wherein between Router A to Router B meets the condition that traffic engineering tunnel is set up completely; Link 1 between Router B and Router C also meets traffic engineering tunnel set up the condition, but link 2 does not meet the condition that traffic engineering tunnel is set up.
As shown in Figure 3, the method comprises the following steps:
Step 301, Router A receives the OSPF message carrying the sub-TLV of increase that Router B sends, and the link information in collection network forms TEDB.
Concrete, Router B sends OSPF message according to the ospf protocol of configuration to Router A, notices the link-state information of themselves capture, comprises the RSVP-TE configuration attribute of each LI(link interface).This OSPF message is the above-mentioned OSPF message with TE extended attribute.Carry the RSVP-TE configuration attribute that Router B arrives the link of Router C in the OSPF message that Router B returns to Router A, identify each link by the value of the Type of sub-TLV increased and whether be configured with RSVP-TE agreement.Such as, Router B collects the link arriving Router C link 1 and link 2, Router B detects that the interface of link 2 does not configure RSVP-TE agreement (namely not configuring RSVP-TE agreement for the interface of Router B or the interface of Router C in link 2), and the interface configuration of link 1 RSVP-TE agreement (namely two side interfaces of link 1 are all configured with RSVP-TE agreement), then Router B carries the information that link 1 is configured with RSVP-TE agreement in the OSPF message returned to Router A, and the Type value of the sub-TLV of the increase of link 1 is 32767.
Router A sets up the TEDB of self according to Router B the OSPF message sent and the link information self added up, and the state information of each link wherein stored comprises each link and whether is configured with RSVP-TE agreement.
Step 302, when Router A needs to set up the traffic engineering tunnel arriving Router C, Router A runs CSPF algorithm, and in TEDB, option and installment has this traffic engineering tunnel of link establishment of RSVP-TE agreement.
Concrete, in scene shown in Fig. 1, Router A runs CSPF algorithm, collects and obtain the link 1 and the link 3 that are configured with RSVP-TE agreement in TEDB.Then, Router A is according to the traffic engineering tunnel between link 3 and 1 foundation with Router C.
In scene shown in Fig. 1, when link 1 is all back to Router A with the information of link 2 by Router B, Router A needs to select a link between link 1 and 2.Because link 1 and 2 is equal-cost link, therefore, one can only be therefrom chosen at random according to existing CSPF routing rule, in the present invention, RouterA can be configured with RSVP-TE agreement according to the Type value determination link 1 of the sub-TLV of the increase of link 1 and 2, link 2 does not configure RSVP-TE agreement, and Router A selects link 1 to set up traffic engineering tunnel.Or the Link State of the link 1 being configured with RSVP-TE agreement detected only is sent to Router A by Router B.
In addition, need explanation, Fig. 1 is a simple application scenarios provided by the invention, in real network scene, Router A, Router B and Router C can comprise multilink each other, even many equal-cost links, now, Router A determines according to the OSPF message that Router B returns the link being configured with RSVP-TE agreement, and the option and installment link establishment traffic engineering tunnel of RSVP-TE agreement.
Being more than the explanation that the OSPF message with TE extended attribute carries out for example, if use the ISIS message with TE extended attribute, the effect of the link establishment traffic engineering tunnel of when there is equal-cost link option and installment RSVP-TE agreement can being played equally.
As shown in Figure 4, in the extended attribute of ISIS message, comprise the necessary condition that traffic engineering tunnel is set up.In the present invention, in The Extended IS Reachability TLV, increase a sub-TLV for judging whether LI(link interface) is configured with RSVP-TE agreement, under ensureing equal-cost link situation, traffic engineering tunnel is normally set up.Concrete, the attribute of the sub-TLV of this increase also can adopt specific type value to identify whether be configured with RSVP-TE agreement.According to TLV distribution condition in RFC, the sub-TLV scope of The Extended IS Reachability TLV is 0-255, distribution condition is concrete as shown in Figure 5, many Type are wherein had not to be assigned with use, preferably, the Type value of getting the sub-TLV of increase in the present invention is 254, needs to illustrate, the sub-TLV of increase also can get other Type values.
Increase sub-TLV in ISIS message after, by method similar shown in Fig. 3, Router A equally can according to the ISIS message with TE extended attribute received, collect the attribute of each link, know whether LI(link interface) is configured with RSVP-TE agreement, in equal-cost link situation, select the link establishment traffic engineering tunnel meeting traffic engineering tunnel set up the condition.
In the present invention, routing device in MPLS network receives and dispatches the Link State Packet of the field of the RSVP-TE configuration attribute carried for identifying link mutually, know the RSVP-TE configuration attribute of link, and then use CSPF algorithms selection interface configuration to have the link establishment traffic engineering tunnel of RSVP-TE agreement, ensure still can set up traffic engineering tunnel when there is equal-cost link.
Based on the technical conceive identical with said method part, the present invention also provides a kind of equipment setting up traffic engineering tunnel, is applied to MPLS network, as shown in Figure 6, comprising:
Transmit-Receive Unit 11, for receiving-transmitting chain state message mutual between neighboring routing device, carries the field of the RSVP-TE configuration attribute for identifying link in this Link State Packet;
Link State collector unit 12, collects the link-state information in MPLS network for the Link State Packet received according to described Transmit-Receive Unit 11 and forms TEDB;
Path-calculating element 13, for running CSPF algorithm, in described TEDB, option and installment has the link of RSVP-TE agreement;
Unit 14 is set up in tunnel, for the link establishment traffic engineering tunnel selected according to described path-calculating element 13.
Described Link State collector unit 12 also for:
Obtain the RSVP-TE configuration attribute of link according to described Link State Packet, and in described TEDB, store the RSVP-TE configuration attribute of link.
Described Link State Packet is specially the OSPF message or ISIS message with TE extended attribute.When described Link State Packet is the OSPF message with TE extended attribute, the sub-TLV that the field of the described RSVP-TE configuration attribute for identifying link increases under being specially the linkinformation field in the MPLS TE LSA field of OSPF message; When described Link State Packet is the ISIS message with TE extended attribute, the field of the described RSVP-TE configuration attribute for identifying link is specially the sub-TLV increased in TheExtended IS Reachability TLV.
Path-calculating element 13 also for:
Select the link that cost is minimum; When there being more than two link costs identical, select the link that the value of minimum available bandwidth is maximum; If remain two with uplink, select the link with minimum hop count; If still remain two with uplink, option and installment has the link of RSVP-TE agreement; If still remain two with uplink, then a Stochastic choice wherein link; Or
Option and installment has the link of RSVP-TE agreement; When have selected two with uplink time, from these two with the link selecting cost minimum uplink; When there being more than two link costs identical, select the link that the value of minimum available bandwidth is maximum; If still remain two with uplink, select the link with minimum hop count; If still remain two with uplink, then a Stochastic choice wherein link.
In the present invention, routing device in MPLS network receives and dispatches the Link State Packet of the field of the RSVP-TE configuration attribute carried for identifying link mutually, know whether the interface of link is configured with RSVP-TE attribute, and then use CSPF algorithms selection interface configuration to have the link establishment traffic engineering tunnel of RSVP-TE agreement, ensure still can set up traffic engineering tunnel when there is equal-cost link.
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 required 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, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform 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 carry out being 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 being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (8)
1. set up a method for traffic engineering tunnel, be applied to the routing device of MPLS network, it is characterized in that, the method comprises:
Mutual receiving-transmitting chain state message between described routing device and neighboring routing device, carries the field of the RSVP-TE configuration attribute for identifying link in this Link State Packet;
Described routing device is collected the link-state information in MPLS network according to described Link State Packet and is formed TEDB;
Described routing device runs CSPF algorithm, and in described TEDB, option and installment has the link of RSVP-TE agreement;
Described routing device is according to the link establishment traffic engineering tunnel selected;
Wherein, described routing device is collected the link-state information in MPLS network according to described Link State Packet and is formed TEDB and comprises:
Described routing device obtains the RSVP-TE configuration attribute of link according to described Link State Packet, and in described TEDB, store the RSVP-TE configuration attribute of link.
2. the method for claim 1, is characterized in that, described Link State Packet is specially the OSPF message or ISIS message with TE extended attribute.
3. method as claimed in claim 2, it is characterized in that, when described Link State Packet is the OSPF message with TE extended attribute, the sub-TLV that the field of the described RSVP-TE configuration attribute for identifying link increases under being specially the link information field in the MPLS TE LSA field of OSPF message;
When described Link State Packet is the ISIS message with TE extended attribute, the field of the described RSVP-TE configuration attribute for identifying link is specially the sub-TLV increased in The Extended IS Reachability TLV.
4. the method for claim 1, is characterized in that, described in described TEDB option and installment have the link of RSVP-TE agreement to comprise:
Select the link that cost is minimum; When there being more than two link costs identical, select the link that the value of minimum available bandwidth is maximum; If remain two with uplink, select the link with minimum hop count; If still remain two with uplink, option and installment has the link of RSVP-TE agreement; If still remain two with uplink, then a Stochastic choice wherein link;
Or
Option and installment has the link of RSVP-TE agreement; When have selected two with uplink time, from these two with the link selecting cost minimum uplink; When there being more than two link costs identical, select the link that the value of minimum available bandwidth is maximum; If still remain two with uplink, select the link with minimum hop count; If still remain two with uplink, then a Stochastic choice wherein link.
5. a routing device, is applied to MPLS network, it is characterized in that, comprising:
Transmit-Receive Unit, for receiving-transmitting chain state message mutual between neighboring routing device, carries the field of the RSVP-TE configuration attribute for identifying link in this Link State Packet;
Link State collector unit, collects the link-state information in MPLS network for the Link State Packet received according to described Transmit-Receive Unit and forms TEDB;
Path-calculating element, for running CSPF algorithm, in described TEDB, option and installment has the link of RSVP-TE agreement;
Unit is set up in tunnel, for the link establishment traffic engineering tunnel selected according to described path-calculating element;
Wherein, described Link State collector unit is used for:
Obtain the RSVP-TE configuration attribute of link according to described Link State Packet, and in described TEDB, store the RSVP-TE configuration attribute of link.
6. routing device as claimed in claim 5, it is characterized in that, described Link State Packet is specially the OSPF message or ISIS message with TE extended attribute.
7. routing device as claimed in claim 6, it is characterized in that, when described Link State Packet is the OSPF message with TE extended attribute, the sub-TLV that the field of the described RSVP-TE configuration attribute for identifying link increases under being specially the link information field in the MPLS TE LSA field of OSPF message;
When described Link State Packet is the ISIS message with TE extended attribute, the field of the described RSVP-TE configuration attribute for identifying link is specially the sub-TLV increased in The Extended IS Reachability TLV.
8. routing device as claimed in claim 5, is characterized in that, described path-calculating element also for:
Select the link that cost is minimum; When there being more than two link costs identical, select the link that the value of minimum available bandwidth is maximum; If remain two with uplink, select the link with minimum hop count; If still remain two with uplink, option and installment has the link of RSVP-TE agreement; If still remain two with uplink, then a Stochastic choice wherein link;
Or
Option and installment has the link of RSVP-TE agreement; When have selected two with uplink time, from these two with the link selecting cost minimum uplink; When there being more than two link costs identical, select the link that the value of minimum available bandwidth is maximum; If still remain two with uplink, select the link with minimum hop count; If still remain two with uplink, then a Stochastic choice wherein link.
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| CN102685004A (en) * | 2012-04-27 | 2012-09-19 | 南京邮电大学 | Method for implementing traffic engineering in GMPLS/OBS (generalized multi-protocol label switching/optical burst switching) network |
| CN103078796B (en) * | 2013-01-28 | 2016-03-30 | 杭州华三通信技术有限公司 | A kind of route computing method and equipment |
| CN103152242B (en) * | 2013-03-11 | 2016-08-10 | 杭州华三通信技术有限公司 | A kind of reception authentication relationship method for building up based on RSVP and equipment |
| CN103475557B (en) * | 2013-09-05 | 2017-02-08 | 华为技术有限公司 | Tunnel setup method and router |
| CN105681195B (en) * | 2014-11-21 | 2020-05-22 | 中兴通讯股份有限公司 | Method and device for collecting LSP path affinity attribute |
| CN104539623B (en) * | 2015-01-07 | 2017-11-07 | 烽火通信科技股份有限公司 | IGP agreements multi-process CSPF's realizes system and method in mixed networking |
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| CN106803811A (en) * | 2015-11-26 | 2017-06-06 | 中兴通讯股份有限公司 | The acquisition methods and device of a kind of routing iinformation |
| CN111147370B (en) * | 2016-07-08 | 2021-08-20 | 华为技术有限公司 | Method and control device for determining forwarding path |
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