CN102123088A - TE (Traffic Engineering) tunnel establishing method and equipment - Google Patents
TE (Traffic Engineering) tunnel establishing method and equipment Download PDFInfo
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Abstract
The invention discloses a TE (Traffic Engineering) tunnel establishing method and equipment. The method comprises the following steps: routing equipment and adjacent routing equipment mutually receive and send link state messages, wherein fields used for identifying RSVP-TE (Resource Reservation Protocol-Traffic Engineering) configuration properties of links are carried in the link state messages; the routing equipment collects link state information in an MPLS (Multiple Protocol Label Switching) network and forms a TEDB (Traffic Engineering Database) according to the link state messages; the routing equipment operates a CSPF (Constraint based Shortest Path First) algorithm, and selects a link configured with a RSVP-TE protocol in the TEDB; and the routing equipment establishes a TE tunnel according to the selected link. In the invention, the TE tunnel can also be normally established under the condition that an equivalent link exists in an MPLS network.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method and apparatus of setting up traffic engineering tunnel.
Background technology
In present Internet network, network congestion is the subject matter that influences the backbone network performance.TE (Traffic Engineering, traffic engineering) is a kind of technical scheme that solves network congestion.For disposing flux engineering in large-scale backbone network, MPLS (Multi-Protocol Label Switching, multiprotocol label switching) TE is widely used.
In the existing MPLS network, the relevant information of TE and generate TEDB (TE Data Base, TE database) in every equipment contribution link.CSPF (Constrained Shortest Path First, constraint formula OSPF) shears the link among the TEDB, and the link that does not satisfy TE attribute specification is cut, and finds a shortest path.When arriving the path of identical destination for many, when perhaps having 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 lower path of cost (cost); When cost is identical, select the path of the value maximum of minimum available bandwidth; If still remain two, select path (being that the number of router is minimum in the path) with minimum hop count with upper pathway; If still remain two, then select a paths at random with upper pathway.The failure that this method of selecting a paths to carry out traffic engineering tunnel foundation at random can cause the tunnel to be set up.
Summary of the invention
The invention provides a kind of method and apparatus of setting up traffic engineering tunnel, in the MPLS network, exist under the situation of equal-cost link and still can normally set up traffic engineering tunnel.
The invention provides a kind of method of setting up traffic engineering tunnel, be applied to the routing device of MPLS network, this method comprises:
Mutual receiving-transmitting chain state message between described routing device and the adjacent routing device, the field of carrying the RSVP-TE configuration attribute that is used to identify link in this Link State Packet;
Described routing device is collected the link-state information in the MPLS network and is formed TEDB according to described Link State Packet;
Described routing device operation CSPF algorithm, the link of RSVP-TE agreement is disposed in selection in described TEDB;
Described routing device is according to the link establishment traffic engineering tunnel of selecting.
Described routing device is collected the link-state information in the MPLS network and is formed TEDB according to described Link State Packet and comprises:
Described routing device obtains the RSVP-TE configuration attribute of link according to described Link State Packet, and stores the RSVP-TE configuration attribute of link in described TEDB.
Described Link State Packet is specially OSPF message or the ISIS message with TE extended attribute.
When described Link State Packet is when having the OSPF message of TE extended attribute, the described field that is used for identifying the RSVP-TE configuration attribute of link is specially the sub-TLV that increases under the link information field of MPLS TE LSA field of OSPF message;
When described Link State Packet is when having the ISIS message of TE extended attribute, the described field that is used for identifying the RSVP-TE configuration attribute of link is specially the sub-TLV that The Extended IS Reachability TLV increases.
The described link of selecting to dispose the RSVP-TE agreement in described TEDB comprises:
Select the minimum link of cost; When two above link costs are identical, select the link of the value maximum of minimum available bandwidth; If remain two, select link with minimum hop count with uplink; If still remain two, select to dispose the link of RSVP-TE agreement with uplink; If still remain two, then select wherein link at random with uplink;
Perhaps
The link of RSVP-TE agreement is disposed in selection; When having selected two during with uplink, from these two to select the minimum link of cost the uplink; When two above link costs are identical, select the link of the value maximum of minimum available bandwidth; If still remain two, select link with minimum hop count with uplink; If still remain two, then select wherein link at random with uplink.
A kind of routing device is applied to the MPLS network, comprising:
Transmit-Receive Unit, be used for and adjacent routing device between mutual receiving-transmitting chain state message, the field of carrying the RSVP-TE configuration attribute that is used to identify link in this Link State Packet;
The Link State collector unit, the Link State Packet that is used for receiving according to described Transmit-Receive Unit is collected the link-state information in the MPLS network and is formed TEDB;
Path-calculating element is used to move the CSPF algorithm, selects to dispose the link establishment traffic engineering tunnel of RSVP-TE agreement in described TEDB;
The unit is set up in the tunnel, is used for the link establishment traffic engineering tunnel of selecting according to described path-calculating element.
Described Link State collector unit also 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.
Described Link State Packet is specially OSPF message or the ISIS message with TE extended attribute.
When described Link State Packet is when having the OSPF message of TE extended attribute, the described field that is used for identifying the RSVP-TE configuration attribute of link is specially the sub-TLV that increases under the link information field of MPLS TE LSA field of OSPF message;
When described Link State Packet is when having the ISIS message of TE extended attribute, the described field that is used for identifying the RSVP-TE configuration attribute of link is specially the sub-TLV that The Extended IS Reachability TLV increases.
Described path-calculating element also is used for:
Select the minimum link of cost; When two above link costs are identical, select the link of the value maximum of minimum available bandwidth; If remain two, select link with minimum hop count with uplink; If still remain two, select to dispose the link of RSVP-TE agreement with uplink; If still remain two, then select wherein link at random with uplink;
Perhaps
The link of RSVP-TE agreement is disposed in selection; When having selected two during with uplink, from these two to select the minimum link of cost the uplink; When two above link costs are identical, select the link of the value maximum of minimum available bandwidth; If still remain two, select link with minimum hop count with uplink; If still remain two, then select wherein link at random with uplink.
Compared with prior art, the present invention has the following advantages at least:
Among the present invention, routing device in the MPLS network is received and dispatched the Link State Packet of the field of carrying the RSVP-TE configuration attribute that is used to identify link mutually, know the RSVP-TE attribute of link, and then utilization CSPF algorithm option interface disposes the link establishment traffic engineering tunnel of RSVP-TE agreement, guarantees to exist under the situation of equal-cost link still can set up traffic engineering tunnel.
Description of drawings
Fig. 1 is that traffic engineering tunnel is set up the mode schematic diagram in the prior art;
Fig. 2 is the structural representation of the OSPF message of the TE of having extended attribute provided by the invention;
Fig. 3 is a schematic flow sheet of setting up the method for traffic engineering tunnel provided by the invention;
Fig. 4 is the structural representation of the ISIS message of the TE of having extended attribute provided by the invention;
Fig. 5 is that the Type value of ISIS message provided by the invention is distributed schematic diagram;
Fig. 6 is a structural representation of setting up the equipment of traffic engineering tunnel provided by the invention.
Embodiment
Among the present invention, the routing device in the MPLS network exchanges link-state information mutually by Link State Packet, comprising the RSVP-TE configuration attribute of LI(link interface).Routing device generates TEDB according to the information of collecting.When routing device initiated to set up traffic engineering tunnel, CSPF sheared the link among the TEDB of route equipment, and option interface disposes the link establishment traffic engineering tunnel of RSVP-TE agreement.
Dispose OSPF (Open Shortest Path First on each routing device in the above-mentioned MPLS network, ospf) agreement or ISIS (linking status Routing Protocol), accordingly, above-mentioned Link State Packet is specially OSPF message with TE extended attribute or the ISIS message with TE extended attribute, and each routing device is received and dispatched OSPF message or the ISIS message with TE extended attribute according to the ospf protocol or the ISIS agreement of configuration.
Introduce respectively below when Link State Packet be the method for setting up traffic engineering tunnel when having the OSPF message of TE extended attribute or ISIS message.
Have the TE extended attribute the OSPF message structure as shown in Figure 2, wherein, comprise MPLS TE LSA field among the TLV of Opaque LSA, MPLS TE LSA field mainly comprises link information (link information) field.Link information field comprises that link local interface IP address (Local Interface IP address), link are to end interface IP address (Remote Interface IP address) and other TLV and sub-TLV field etc.Among the present invention, can normally set up, in the link information of MPLS TE LSA field, add sub-TLV field and be used to judge whether the interface of link has disposed the RSVP-TE agreement for traffic engineering tunnel under the situation that guarantees to exist equal-cost link.Each sub-TLV in the link information field has Type value separately, span is 1-65535, wherein the value of 1-32767 is that standard is effective, sub-TLV among the existing Link TLV is fixing, and the sub-Types value of using is 1 to 9, therefore, the span of the Type of the sub-TLV that increases among the present invention is 10-32767.Below be example with the Type value 32767 of the sub-TLV that increases.
Routing device in the MPLS network is filled the property value of each field in the OSPF message of the above-mentioned sub-TLV that carries increase according to the Link State of self, and sends the OSPF message of the sub-TLV that carries increase mutually.Wherein, when self LI(link interface) had disposed the RSVP-TE agreement, the Type value of the sub-TLV of increase was 32767.
Each network equipment forms TEDB according to the Link State in the OSPF message collection network that receives.When routing device initiated to set up traffic engineering tunnel, this routing device calculated the link of the traffic engineering tunnel that arrives the tunnel tail node as traffic engineering tunnel head node equipment operation CSPF according to the link-state information of collecting.Tunnel head node equipment specifically selects to set up the link of traffic engineering tunnel in the multilink that arrives the tunnel tail node by following manner:
Select the lower link of cost (cost); When cost is identical, select the link of the value maximum of minimum available bandwidth; If still remain two, select link (being that the number of router is minimum in the link) with minimum hop count with uplink; If still remain two with uplink, then option interface has all disposed the link of RSVP-TE agreement; If still remain two, then select wherein link at random with uplink;
Perhaps
Option interface has all disposed the link of RSVP-TE agreement; From the residue link, select the lower link of cost (cost); When cost is identical, select the link of the value maximum of minimum available bandwidth; If still remain two, select link with minimum hop count with uplink; If still remain two, then select wherein one at random with uplink.
Below in conjunction with concrete application scenarios, introduce the method for setting up traffic engineering tunnel provided by the invention.
With scene shown in Figure 1 is example, sets up a traffic engineering tunnel from Router A to Router C, has two equal-cost links between Router B and Router C.Wherein Router A satisfies the condition that traffic engineering tunnel is set up fully to the link between the Router B; Link 1 between Router B and the Router C also satisfies traffic engineering tunnel and sets up condition, but link 2 does not satisfy the condition that traffic engineering tunnel is set up.
As shown in Figure 3, this method may further comprise the steps:
Concrete, Router B sends the OSPF message according to the ospf protocol of configuration to Router A, announces the link-state information of self collecting, and comprises the RSVP-TE configuration attribute of each LI(link interface).This OSPF message is above-mentioned OSPF message with TE extended attribute.Router B carries the RSVP-TE configuration attribute that Router B arrives the link of Router C in the OSPF message that Router A returns, the value of the Type by the sub-TLV that increases identifies each link and whether disposed the RSVP-TE agreement.For example, Router B collects the link that arrives Router C link 1 and link 2, the interface that Router B detects link 2 does not dispose RSVP-TE agreement (being that the interface for the interface of Router B or Router C does not dispose the RSVP-TE agreement in the link 2), and the interface configuration of link 1 RSVP-TE agreement (two side interfaces that are link 1 have all disposed the RSVP-TE agreement), then Router B carries the information that link 1 has disposed the RSVP-TE agreement in the OSPF message that returns 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 OSPF message that sends and the link information of self adding up, and wherein the state information of Cun Chu each link comprises whether each link disposes the RSVP-TE agreement.
Concrete, in scene shown in Figure 1, Router A operation CSPF algorithm is collected link 1 and the link 3 that obtains disposing the RSVP-TE agreement in TEDB.Then, Router A is according to the traffic engineering tunnel between link 3 and 1 foundation and the Router C.
In the scene shown in Figure 1, when Router B was back to Router A with the information of link 1 and link 2, Router A need select a link between link 1 and 2.Because link 1 and 2 is an equal-cost link, therefore, can only therefrom choose at random one according to existing CSPF routing rule, among the present invention, Router A can determine that link 1 has disposed the RSVP-TE agreement according to the Type value of the sub-TLV of the increase of link 1 and 2, link 2 does not dispose the RSVP-TE agreement, and Router A selects link 1 to set up traffic engineering tunnel.Perhaps, Router B only is sent to Router A with the Link State of the link 1 of the detected RSVP-TE of disposing agreement.
In addition, need explanation, Fig. 1 is a simple application scenarios provided by the invention, in the real network scene, Router A, Router B and Router C can comprise multilink each other, even many equal-cost links, at this moment, Router A has determined to dispose the link of RSVP-TE agreement according to the OSPF message that Router B returns, and selects to have disposed the link establishment traffic engineering tunnel of RSVP-TE agreement.
More than be to be the explanation that example is carried out,, can play the effect of the link establishment traffic engineering tunnel of when having equal-cost link, selecting to have disposed the RSVP-TE agreement equally if use ISIS message with TE extended attribute with OSPF message with TE extended attribute.
As shown in Figure 4, in the extended attribute of ISIS message, comprise the necessary condition that traffic engineering tunnel is set up.Among the present invention, in The Extended IS Reachability TLV, increase a sub-TLV and be used to judge whether LI(link interface) has disposed the RSVP-TE agreement, guarantee that traffic engineering tunnel is normally set up under the equal-cost link situation.Concrete, the attribute of the sub-TLV of this increase also can adopt specific type value to identify and whether dispose the RSVP-TE agreement.According to TLV distribution condition among the RFC, the sub-TLV scope of The Extended IS Reachability TLV is 0-255, distribution condition specifically as shown in Figure 5, wherein there are many Type not to be assigned with use, preferably, the Type value of getting the sub-TLV of increase among the present invention is 254, needs explanation, and the sub-TLV of increase also can get other Type values.
After in the ISIS message, increasing sub-TLV, by similar methods shown in Figure 3, Router A equally can be according to the ISIS message with TE extended attribute that receives, collect the attribute of each link, know whether LI(link interface) has disposed the RSVP-TE agreement, select to satisfy the link establishment traffic engineering tunnel that traffic engineering tunnel is set up condition under the equal-cost link situation.
Among the present invention, routing device in the MPLS network is received and dispatched the Link State Packet of the field of carrying the RSVP-TE configuration attribute that is used to identify link mutually, know the RSVP-TE configuration attribute of link, and then utilization CSPF algorithm option interface disposes the link establishment traffic engineering tunnel of RSVP-TE agreement, guarantees to exist under the situation of equal-cost link still can set up traffic engineering tunnel.
Based on the technical conceive identical with the said method part, the present invention also provides a kind of equipment of setting up traffic engineering tunnel, is applied to the MPLS network, as shown in Figure 6, comprising:
Transmit-Receive Unit 11, be used for and adjacent routing device between mutual receiving-transmitting chain state message, the field of carrying the RSVP-TE configuration attribute that is used to identify link in this Link State Packet;
Link State collector unit 12 is used for collecting the link-state information in the MPLS network and forming TEDB according to the Link State Packet that described Transmit-Receive Unit 11 receives;
Path-calculating element 13 is used to move the CSPF algorithm, selects to dispose the link of RSVP-TE agreement in described TEDB;
Described Link State collector unit 12 also 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.
Described Link State Packet is specially OSPF message or the ISIS message with TE extended attribute.When described Link State Packet is when having the OSPF message of TE extended attribute, the described field that is used for identifying the RSVP-TE configuration attribute of link is specially the sub-TLV that increases under the link information field of MPLS TE LSA field of OSPF message; When described Link State Packet is when having the ISIS message of TE extended attribute, the described field that is used for identifying the RSVP-TE configuration attribute of link is specially the sub-TLV that The Extended IS Reachability TLV increases.
Path-calculating element 13 also is used for:
Select the minimum link of cost; When two above link costs are identical, select the link of the value maximum of minimum available bandwidth; If remain two, select link with minimum hop count with uplink; If still remain two, select to dispose the link of RSVP-TE agreement with uplink; If still remain two, then select wherein link at random with uplink; Perhaps
The link of RSVP-TE agreement is disposed in selection; When having selected two during with uplink, from these two to select the minimum link of cost the uplink; When two above link costs are identical, select the link of the value maximum of minimum available bandwidth; If still remain two, select link with minimum hop count with uplink; If still remain two, then select wherein link at random with uplink.
Among the present invention, routing device in the MPLS network is received and dispatched the Link State Packet of the field of carrying the RSVP-TE configuration attribute that is used to identify link mutually, whether the interface of knowing link disposes the RSVP-TE attribute, and then utilization CSPF algorithm option interface disposes the link establishment traffic engineering tunnel of RSVP-TE agreement, guarantees to exist under the situation of equal-cost link still can set up traffic engineering tunnel.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of 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, module in the 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 among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (10)
1. method of setting up traffic engineering tunnel is applied to the routing device of MPLS network, it is characterized in that this method comprises:
Mutual receiving-transmitting chain state message between described routing device and the adjacent routing device, the field of carrying the RSVP-TE configuration attribute that is used to identify link in this Link State Packet;
Described routing device is collected the link-state information in the MPLS network and is formed TEDB according to described Link State Packet;
Described routing device operation CSPF algorithm, the link of RSVP-TE agreement is disposed in selection in described TEDB;
Described routing device is according to the link establishment traffic engineering tunnel of selecting.
2. the method for claim 1 is characterized in that, described routing device is collected the link-state information in the MPLS network and formed TEDB according to described Link State Packet and comprises:
Described routing device obtains the RSVP-TE configuration attribute of link according to described Link State Packet, and stores the RSVP-TE configuration attribute of link in described TEDB.
3. method as claimed in claim 1 or 2 is characterized in that, described Link State Packet is specially OSPF message or the ISIS message with TE extended attribute.
4. method as claimed in claim 3, it is characterized in that, when described Link State Packet is when having the OSPF message of TE extended attribute, the described field that is used for identifying the RSVP-TE configuration attribute of link is specially the sub-TLV that increases under the link information field of MPLS TE LSA field of OSPF message;
When described Link State Packet is when having the ISIS message of TE extended attribute, the described field that is used for identifying the RSVP-TE configuration attribute of link is specially the sub-TLV that The Extended IS Reachability TLV increases.
5. the method for claim 1 is characterized in that, the described link of selecting to dispose the RSVP-TE agreement in described TEDB comprises:
Select the minimum link of cost; When two above link costs are identical, select the link of the value maximum of minimum available bandwidth; If remain two, select link with minimum hop count with uplink; If still remain two, select to dispose the link of RSVP-TE agreement with uplink; If still remain two, then select wherein link at random with uplink;
Perhaps
The link of RSVP-TE agreement is disposed in selection; When having selected two during with uplink, from these two to select the minimum link of cost the uplink; When two above link costs are identical, select the link of the value maximum of minimum available bandwidth; If still remain two, select link with minimum hop count with uplink; If still remain two, then select wherein link at random with uplink.
6. a routing device is applied to the MPLS network, it is characterized in that, comprising:
Transmit-Receive Unit, be used for and adjacent routing device between mutual receiving-transmitting chain state message, the field of carrying the RSVP-TE configuration attribute that is used to identify link in this Link State Packet;
The Link State collector unit, the Link State Packet that is used for receiving according to described Transmit-Receive Unit is collected the link-state information in the MPLS network and is formed TEDB;
Path-calculating element is used to move the CSPF algorithm, selects to dispose the link of RSVP-TE agreement in described TEDB;
The unit is set up in the tunnel, is used for the link establishment traffic engineering tunnel of selecting according to described path-calculating element.
7. routing device as claimed in claim 6 is characterized in that, 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.
8. as claim 6 or 7 described routing devices, it is characterized in that described Link State Packet is specially OSPF message or the ISIS message with TE extended attribute.
9. routing device as claimed in claim 8, it is characterized in that, when described Link State Packet is when having the OSPF message of TE extended attribute, the described field that is used for identifying the RSVP-TE configuration attribute of link is specially the sub-TLV that increases under the link information field of MPLS TE LSA field of OSPF message;
When described Link State Packet is when having the ISIS message of TE extended attribute, the described field that is used for identifying the RSVP-TE configuration attribute of link is specially the sub-TLV that The Extended IS Reachability TLV increases.
10. routing device as claimed in claim 8 is characterized in that, described path-calculating element also is used for:
Select the minimum link of cost; When two above link costs are identical, select the link of the value maximum of minimum available bandwidth; If remain two, select link with minimum hop count with uplink; If still remain two, select to dispose the link of RSVP-TE agreement with uplink; If still remain two, then select wherein link at random with uplink;
Perhaps
The link of RSVP-TE agreement is disposed in selection; When having selected two during with uplink, from these two to select the minimum link of cost the uplink; When two above link costs are identical, select the link of the value maximum of minimum available bandwidth; If still remain two, select link with minimum hop count with uplink; If still remain two, then select wherein link at random with uplink.
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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 |
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