CN101159695A - Link selecting method and apparatus - Google Patents
Link selecting method and apparatus Download PDFInfo
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- CN101159695A CN101159695A CNA2007101872426A CN200710187242A CN101159695A CN 101159695 A CN101159695 A CN 101159695A CN A2007101872426 A CNA2007101872426 A CN A2007101872426A CN 200710187242 A CN200710187242 A CN 200710187242A CN 101159695 A CN101159695 A CN 101159695A
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Abstract
The invention discloses a link selection method, which comprises following steps: acquiring link delay parameters of each link node; and selecting the link delay parameters as the selection basis of a constrained shortest path first CSPF algorithm when the link is needed to be selected to construct a multi-protocol label switch traffic engineering MPLS TE tunnel. The invention discloses node equipment used as a head node for selecting link to a destination link node. By using the invention, the TE tunnel is constructed by using the link delay as the basis of CSPF for selecting path, such that the constructed tunnel after the link delay change can be re-optimized to a link having small delay, thereby satisfying the requirement for constructing the tunnel for tasks sensitive to time delay, such as audio and video tasks.
Description
Technical field
The present invention relates to networking technology area, relate in particular to a kind of link selecting method and equipment.
Background technology
Present MPLS (Multi-Protocol Label Switch, multiprotocol label switching) TE (TrafficEngineering, traffic engineering) path computing adopts CSPF (Constrained Shortest PathFirst is based on the shortest-path first algorithm of constraint) algorithm in the technology.CSPF calculates and arrives the termination point of a tunnel shortest path, do not re-use between simple neighbours link cost as metric, and utilized bandwidth, Link color, administrative power recast are basis, also have the highest several arbitration foundations when two roads when same attribute is arranged in addition: the minimum hop count in bandwidth availability ratio, path.
Below explanation available technology adopting CSPF carries out the algorithm of link selection.In networking shown in Figure 1, there are a plurality of RT (Router, router), each RT is a link nodes in the link.When RTA needs to set up the MPLS traffic engineering tunnel between RTB, MPLS TE is IGP (the Interior Gateway Protocol by expanding earlier, IGRP) link attribute (as bandwidth, management weights, Link color) with TE attribute is carried in propagation in entire I GP zone, CSPF calculates the algorithm that is adopted and follows SPF (Shortest Path First, SPF) algorithm (being called dijkstra's algorithm again) is similar substantially, just constraints has difference when calculating, and adopts following principle to carry out link selection:
1, finds the path of the minimum cost of IGP, therefore get rid of path 1;
2, search the path of maximum available bandwidth, therefore get rid of path 2;
If it is a plurality of that the path of 3 maximum available bandwidths exists, find out the minimum path of jumping figure, therefore get rid of path 3;
If 4 still exist a plurality ofly, then can select according in following 3 principles any:
(1) selects at random, promptly in path 4,5, select one at random; Or
(2) select (most-fill) of link compactedness maximum, wherein dedicated bandwidth/the total bandwidth of link compactedness=; Or
(3) (least-fill) of selection link compactedness minimum.
At present, for some voice and video traffic, responsive more to the link time-delay.Therefore when selecting the link establishment tunnel, need foresee the time-delay of different links in advance, the tunnel is set up in the shortest path of selecting to delay time.And existing above-mentioned CSPF carries out in the method for link selection, does not use the link time-delay to select foundation as CSPF, can not guarantee to offer to the more path of low delay of sensitive traffic of delaying time.In addition, for IGP TE expansion, time-delay does not provide independent extended field to link, can not offer the voice and video business in dynamic optimization adjustment low delay TE path.
Summary of the invention
The invention provides a kind of link selecting method, be used to realize select the foundation in path to set up the MPLS traffic engineering tunnel as CSPF the link time-delay.
For achieving the above object, the invention provides a kind of link selecting method, may further comprise the steps:
Obtain the link delay parameter of each link nodes;
When need selecting link establishment multi-protocol label switching traffic engineering MPLS traffic engineering tunnel, with described link delay parameter as selection foundation based on the shortest-path first algorithm CSPF that retrains.
Wherein, the described link delay parameter that obtains each link nodes is specially:
Receive the exploitation SPF ospf protocol message that each link nodes sends;
Resolve the extended field in the described ospf protocol message, obtain the link delay parameter that wherein carries and store local MPLS TE database into.
Wherein, before the described link delay parameter that obtains each link nodes, also comprise:
Each link nodes gets access to the link delay parameter of object chain circuit node;
With each the link nodes diffusion in link of described link delay parameter.
Wherein, the described link delay parameter that gets access to the object chain circuit node is specially:
Send probe messages and receive the response message that described object chain circuit node sends to the address of described object chain circuit node;
According to the difference of timestamp in described probe messages and the described response message, get access to the link delay parameter of described object chain circuit node.
Wherein, described link delay parameter each link nodes in link is spread is specially:
Described link delay parameter is sent to the MPLS TE entity of this link nodes;
Described MPLS TE entity is added on described link delay parameter in the extended field of ospf protocol message;
Described MPLS TE is diffused into each link nodes in the link with the described ospf protocol message that carries the link delay parameter.
Wherein, the described ospf protocol message that will carry the link delay parameter also comprises after being diffused into each link nodes in the link:
When detecting the described link delay parameter that obtains and changing, surpass default threshold value if described link delay parameter changes difference, then with the link delay parameter after the described variation by each link nodes diffusion in link of ospf protocol message.
Wherein, described ospf protocol message is OSPF TYPE10 LSA message or Update message.
The present invention also provides a kind of node device, comprising:
Link delay parameter acquiring unit is used to obtain the link delay parameter of each link nodes;
The link selection unit, when being used for need selecting the link establishment tunnel as first node, the link delay parameter that described link delay parameter acquiring unit is obtained is as the selection foundation of CSPF.
Wherein, also comprise:
MPLS TE Database Unit is used to store the link delay parameter that described link delay parameter acquiring unit gets access to, and offers described link selection unit.
Wherein, also comprise:
The link detection unit is used for getting access to the link delay parameter of described object chain circuit node by sending probe messages and receive response message to the object chain circuit node;
The information release unit is used for each link nodes diffusion to link of the link delay parameter of object chain circuit node that described link detection unit is obtained.
Wherein, also comprise:
Upgrade judging unit, be used for when the link delay parameter to the object chain circuit node that described link detection unit obtains changes, surpass default threshold value if described link delay parameter changes difference, then the link delay parameter after the described variation is sent to described information release unit.
Compared with prior art, the present invention has the following advantages:
The equipment in the network that makes selects the foundation in path to set up mpls-te tunnel as CSPF the link time-delay, and can be after link time-delay changes with the tunnel re-optimization set up to the little link of time-delay, thereby satisfy the needs of voice and video etc. being set up the tunnel to the responsive business of delaying time.
Description of drawings
Fig. 1 is the networking schematic diagram that available technology adopting CSPF carries out link selection;
Fig. 2 is the flow chart of a kind of link selecting method among the present invention;
Fig. 3 is the form schematic diagram of the TYPE10 LSA message that uses of the present invention;
Fig. 4 is the form schematic diagram of TLV in the TYPE10 LSA message that uses of the present invention;
Fig. 5 is the schematic diagram of a link selection scene among the present invention;
Fig. 6 is the schematic diagram of a kind of routing device among the present invention.
Embodiment
Core concept of the present invention is: obtain the link delay parameter of each link nodes in the network link, select the foundation in path to set up the MPLS traffic engineering tunnel as CSPF this link delay parameter.
Among the present invention, a kind of link selecting method wherein, is that router is an example with each link nodes in the link as shown in Figure 2, may further comprise the steps:
Step s101, router obtain and destination router between the link time-delay of link.
Concrete, this obtain link time-delay method can for: use NQA (Network QualityAnalyzer, Network Quality Analysis) method, in direct connected link, send ICMP (the Internet Control Message Protocol that comprises timestamp to the destination router address, the Internet Internet Control Message Protocol) ECHO message, the other side responds and has carried the ICMP Reply message that transmitting time is stabbed and response time is stabbed, and calculates the link time-delay by time tolerance.
Step s102, router are synchronized to local MPLS TE functional entity with the link time-delay that gets access to.
Step s103, MPLS TE functional entity spread delay parameter by the ospf protocol message in this area.
Concrete, MPLS TE entity can be with link time-delay OSPF (the Open ShortestPath First that gets access to, preferential open shortest path) TYPE10 LSA (Link State Advertisement, LSA) spreads after expanding encapsulation, according to present regulation for TYPE10 LSA, range of scatter is area-local (only in the one's respective area with interior diffusion), then flooding mechanism is that only the link in current area spreads, and each link nodes on the link can both receive this message.
This area be meant to solving the bandwidth availability ratio that router quantity in the network causes when huge descend, according to ospf protocol with a plurality of zones (area) that network was divided into.The zone logically is divided into router different groups.Different zones identifies with regional number (area id).
In the prior art, the form of TYPE10 LSA message as shown in Figure 3.Wherein, front 20 bytes are the LSA head, and the Opaque information of back is the TLV that has MPLS TE attribute, and the form of TLV as shown in Figure 4.
Be divided into two kinds for TLV: be respectively the router address TLV of Type=1 and the link TLV of Type=2, wherein link TLV is made up of different Sub-TLV in 9, describes the various parameters of link, comprising:.
1-Link type (1octet): Linktype, support point-to-point and multichannel to reach;
2-Link ID (4octets): link ID;
3-Local interface IP address (4octets): local interface IP address;
4-Remote interface IP address (4octets): remote interface address;
5-Traffic engineering metric (4octets): the tolerance of traffic engineering;
6-Maximum bandwidth (4octets): maximum link bandwidth;
7-Maximum reservable bandwidth (4octets): but the maximum reserved bandwidth;
8-Unreserved bandwidth (32octets): current available bandwidth (at each priority);
9-Administrative group (4octets): link attribute sign.
According to the regulation of prior art, the sub-TLV type is that 32778-65535 does not also distribute, and therefore can select one of them to be defined as time-delay, is example as representing the link time-delay with 60000:
60000-Link Lantency (4octets): link time-delay.
Step s104, each router upgrade local TEDB according to this OSPF message.
Concrete, safeguard link attribute and the topological attribute that has in the network among the TEDB of each router (Traffic Engineering DataBase, traffic engineering database).Carry the OSPF message of link delay parameter according to this, can be in the TEDB of this locality to network in the link attribute of respective links safeguard, comprise the maintenance of link time-delay attribute.
When the router in step s105, the network need be set up the MPLS traffic engineering tunnel, with the link foundation that attribute calculates as CSPF of delaying time.
Concrete, when the select target router carries out setting up of MPLS traffic engineering tunnel, not only needing to adopt existing basis in the prior art, the link time-delay that also needs to increase newly is as the CSPF basis.In addition, can according to actual needs the priority of delay parameter as the CSPF basis be set.For example: can be with link time-delay, COST and bandwidth as the high priority condition.If other conditions such as bandwidth are consistent with COST, then relatively link time-delay, the link that the preferred link time-delay is less.For example for situation shown in Figure 5, RTA is when needs and RTB set up the tunnel, and under the bandwidth of the two paths up and down situation consistent with COST, RTA can select the little link of top link time-delay to be used for setting up the tunnel with RTB.
Step s106, set up the tunnel with selected destination router.
Concrete, can use RSVP (Resource Reservation Protocol, RSVP) and destination router to set up new tunnel.
Except above-mentioned router obtain link time-delay as link nodes and the step that in the link of network, spreads, each router in the network also needs real-time update is carried out in the variation of link time-delay.When getting access to new link delay parameter, each router in the network can carry the OSPF Update message of new link delay parameter by transmission, and the link time-delay of particular link is upgraded.The OSPF update package that the minor variations of delaying time for fear of link causes repeats to send, and can on each router in network a threshold value be set.When router detection arrives the link delay parameter variation of link, determine whether sending OSPF Update message by the threshold value that is provided with.For example, when the positive and negative variation of the difference of twice time-delay in front and back surpassed threshold value A% (as 5%), router just can send OSPF Update message and be diffused in the whole area.
The said method that the application of the invention provides, the equipment in the network that makes selects the foundation in path to set up traffic engineering tunnel as CSPF the link time-delay, can be after link time-delay changes with the tunnel re-optimization set up to the little link of time-delay, thereby satisfy the needs of voice and video etc. being set up the tunnel to the responsive business of delaying time.
A kind of node device also is provided among the present invention, as shown in Figure 6, comprises:
Link delay parameter acquiring unit 11 is used to obtain the link delay parameter of each link nodes; Acquisition methods is specially: resolve the extended field of the message of other link nodes transmissions, get access to the link delay parameter that wherein carries, this message can be OSPF TYPE10 LSA message or the Update message based on ospf protocol.
MPLS TE Database Unit 13 is used to store link delay parameter that link delay parameter acquiring unit 11 gets access to and the parameter that is used for the selection of CSPF, and offers link selection unit 12 and be used for link selection.
This node device also comprises:
Upgrade judging unit 16, when the link delay parameter that is used for obtaining when link detection unit 14 changes, surpass default threshold value if the link delay parameter changes difference, the link delay parameter after then will changing sends to information release unit 15.
The said equipment that the application of the invention provides, the equipment in the network that makes selects the foundation in path to set up traffic engineering tunnel as CSPF the link time-delay, can be after link time-delay changes with the tunnel re-optimization set up to the little link of time-delay, thereby satisfy the needs of voice and video etc. being set up the tunnel to the responsive business of delaying time.
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, comprises that some instructions are used so that an equipment is carried out the described method of each embodiment of the present invention.
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 (11)
1. a link selecting method is characterized in that, may further comprise the steps:
Obtain the link delay parameter of each link nodes;
When need selecting link establishment multi-protocol label switching traffic engineering MPLS traffic engineering tunnel, with described link delay parameter as selection foundation based on the shortest-path first algorithm CSPF that retrains.
2. link selecting method according to claim 1 is characterized in that the described link delay parameter that obtains each link nodes is specially:
Receive the exploitation SPF ospf protocol message that each link nodes sends;
Resolve the extended field in the described ospf protocol message, obtain the link delay parameter that wherein carries and store local MPLS TE database into.
3. link selecting method according to claim 1 is characterized in that, before the described link delay parameter that obtains each link nodes, also comprises:
Each link nodes gets access to the link delay parameter of object chain circuit node;
With each the link nodes diffusion in link of described link delay parameter.
4. as link selecting method as described in the claim 3, it is characterized in that the described link delay parameter that gets access to the object chain circuit node is specially:
Send probe messages and receive the response message that described object chain circuit node sends to the address of described object chain circuit node;
According to the difference of timestamp in described probe messages and the described response message, get access to the link delay parameter of described object chain circuit node.
5. as link selecting method as described in the claim 3, it is characterized in that, described each link nodes diffusion in link of link delay parameter be specially:
Described link delay parameter is sent to the MPLS TE entity of this link nodes;
Described MPLS TE entity is added on described link delay parameter in the extended field of ospf protocol message;
Described MPLS TE is diffused into each link nodes in the link with the described ospf protocol message that carries the link delay parameter.
6. as link selecting method as described in the claim 5, it is characterized in that the described ospf protocol message that will carry the link delay parameter also comprises after being diffused into each link nodes in the link:
When detecting the described link delay parameter that obtains and changing, surpass default threshold value if described link delay parameter changes difference, then with the link delay parameter after the described variation by each link nodes diffusion in link of ospf protocol message.
7. as link selecting method as described in claim 2 or 5 or 6, it is characterized in that described ospf protocol message is OSPF TYPE10 LSA message or Update message.
8. a node device is characterized in that, comprising:
Link delay parameter acquiring unit is used to obtain the link delay parameter of each link nodes;
The link selection unit, when being used for need selecting the link establishment tunnel as first node, the link delay parameter that described link delay parameter acquiring unit is obtained is as the selection foundation of CSPF.
9. as node device as described in the claim 8, it is characterized in that, also comprise:
MPLS TE Database Unit is used to store the link delay parameter that described link delay parameter acquiring unit gets access to, and offers described link selection unit.
10. as node device as described in the claim 8, it is characterized in that, also comprise:
The link detection unit is used for getting access to the link delay parameter of described object chain circuit node by sending probe messages and receive response message to the object chain circuit node;
The information release unit is used for each link nodes diffusion to link of the link delay parameter of object chain circuit node that described link detection unit is obtained.
11. as node device as described in the claim 10, it is characterized in that, also comprise:
Upgrade judging unit, be used for when the link delay parameter to the object chain circuit node that described link detection unit obtains changes, surpass default threshold value if described link delay parameter changes difference, then the link delay parameter after the described variation is sent to described information release unit.
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| CNA2007101872426A CN101159695A (en) | 2007-11-16 | 2007-11-16 | Link selecting method and apparatus |
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| CN101296180B (en) * | 2008-06-19 | 2010-11-10 | 上海交通大学 | Wireless Mesh network self-adapting routing method based on throughput performance |
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