CN1202638C - Method for delivering link state information to pass through network - Google Patents
Method for delivering link state information to pass through network Download PDFInfo
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- CN1202638C CN1202638C CN 03114923 CN03114923A CN1202638C CN 1202638 C CN1202638 C CN 1202638C CN 03114923 CN03114923 CN 03114923 CN 03114923 A CN03114923 A CN 03114923A CN 1202638 C CN1202638 C CN 1202638C
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Abstract
The present invention relates to a method for delivering link state information to pass through a network, which is used for passing through a multi-hop IP network in a control plane of an automatically switched optical network to transfer a routing packet of the link state information of an optical network transmission plane. The present invention belongs to the technical field of optical communication. The packs OSPF (an open shortest path protocol) routing packets used for describing the link state information of the optical network transmission plane by adding independent packing / unpacking modules in a node of an optical network control plane, which leads transmitted link state information to penetrate through the multi-hop IP network. The method provided by the present invention has the advantages of high packing efficiency, good versatility and simple realization, solves the problem that the link state information can not be transmitted by penetrating through the network between nodes of the control plane, eliminates the topology limitation of the control plane in an IP network, and greatly enhances the flexibility of the design of ht e optical network control plane.
Description
Technical field
The present invention relates to the method that a kind of link-state information passing through network is passed on, be used for passing through the route bag that the multi-hop IP network is transmitted light network transmission plane link-state information, belong to the optical communication technology field at the ASON control plane.
Technical background:
ASON can be divided into three parts on function: management plane, control plane and transmission plane.ASON utilizes the intelligence of control plane to realize exchange automatically, could make the decision-making of setting up light path according to gained information but the node of control plane must be able to access the link-state information that transmits the plane.With must mutual relays link state information between the node of the corresponding control plane of node that directly links to each other by optical fiber in the light network transmission plane.Therefore, in light network control system plane, high-efficiency reliable is passed on the link-state information on light network transmission plane to become and is realized the prerequisite of exchange automatically.
In order to realize the control plane of ASON, internet engineering working group (IETF) has formulated GMPLS (GMPLS) agreement and has supported light network control system plane to move in IP network.In light network control system plane, the GMPLS agreement adopts improved open shortest path agreement (ospf protocol) to pass on the link-state information of describing light network transmission plane.
At present, can not pass through the link-state information that the multi-hop IP network is transmitted light network transmission plane between light network control system plane node, its reason is the restriction of ospf protocol itself.Ospf protocol regulation OSPF route bag can not be transmitted by the router in the IP network, and this makes OSPF route bag can not pass through the multi-hop IP network.Though in the draft that IETF proposes, proposed the modification of ospf protocol but do not proposed solution to this problem.
Summary of the invention:
The objective of the invention is to be at the deficiencies in the prior art, propose a kind of efficient, general, simple method, the route of describing transmission plane link-state information is wrapped in pass through the multi-hop IP network in the control plane.
In order to realize such requirement, the present invention proposes the method that a kind of link-state information passing through network is passed on, by in the node on light network control system plane, increasing independently encapsulation/decapsulation module, carry out the IP-in-IP encapsulation to being used to describe OSPF (open shortest path agreement) the route bag that optical-fiber network transmits the plane link-state information, make the link-state information that transmits to pass through the multi-hop IP network.
Technical scheme of the present invention comprises:
In the node on each light network control system plane, increase an independently IP-in-IP encapsulation/decapsulation module, realize the OSPF route bag that produces in the node is encapsulated and decapsulation.To send in the control plane node of Link State descriptor at each, the description that is produced by the ospf protocol module is transmitted the routing IP bag of plane link-state information as data, transferring to the IP-in-IP package module by interprocess communication encapsulates it, the new IP head that adds adopts this machine address as source IP address, adopts purpose control plane node address as purpose IP address.
The node of control plane judges whether that by differentiating its protocol number the packet of receiving is transferred to the IP-in-IP decapsulation module to be handled to the IP that receives bag, and the OSPF route bag that encapsulate and the OSPF route packet protocol that does not encapsulate are number different.To the OSPF route bag that encapsulated, transferring to the IP-in-IP decapsulation module handles, decapsulation module is taken out and wherein is encapsulated in inner OSPF route bag, transfers to the ospf protocol module by interprocess communication again and handles, and finishes the reception and registration of link-state information passing through network.OSPF route bag to not encapsulating then abandons it.
After adopting this selection drop mechanism, even the router in the IP network of control plane place also moves the OSPF Routing Protocol, can do not thought by mistake be the route bag that sends by light network control system plane node by the OSPF route bag that these routers produced by the node on light network control system plane yet, thus the influence of having avoided the operation of light network control system plane ospf protocol to be subjected to.Simultaneously because the router in the network of control plane place, encapsulation back will can not think that the encapsulated data packet of being transmitted by it is the OSPF packet, thereby avoided influence to control plane place IP network.
The present invention increases the independently method of encapsulation/decapsulation module owing to having adopted, the compatible fully suggestion of being adopted the link-state information on improved ospf protocol reception and registration light network transmission plane by the light network control system plane that proposes in the ietf draft.The use that the ospf protocol of moving in original smooth network control system plane node can not make an amendment has realized versatility and simplicity requirement.The minimum encapsulation cost that the method for packing of the IP-in-IP that the present invention adopts adopts on the basis of respecting original protocol specification has realized that the route free clothing gets over the multi-hop IP network, has satisfied the requirement that optical network control plane is efficiently passed on link-state information.Control plane can run in the IP network that adopts any Routing Protocol after the method that adopts the present invention to propose simultaneously, does not have any influence between the routing iinformation that router sent in routing iinformation that transmits between the node of control plane and the network.
The present invention use a kind of packaging efficiency height, versatility good, realize that simple method has solved between the node of control plane and can not pass through the problem that the transmission of multi-hop IP network transmits the plane link-state information, eliminate the topological constraints of light network control system plane in IP network, strengthened the flexibility of light network control system planar design greatly.
Description of drawings:
The situation schematic diagram that Fig. 1 is separated by the multi-hop IP network for light network control system plane node.
As shown in Figure 1, OXC1 and OXC2 are two optical cross connection nodes (OXC) on the light network transmission plane, directly link to each other by optical fiber; The control section of OXC1 and the control section of OXC2 corresponding OXC1 of difference and the node of OXC2 in control plane are separated by the multi-hop IP network.Link-state information between OXC1 and the OXC2 must be transmitted with the form of OSPF route bag between the control section of the control section of OXC1 and OXC2.Shown in figure, separated by the multi-hop IP network between the control section of the control section of OXC1 and OXC2 in the control plane, if the method that does not adopt the present invention to propose then can not be transmitted the link-state information on light network transmission plane between them.
Fig. 2 is after adopting method of the present invention, the process that the link-state information passing through network is passed on.
Fig. 3 is the explanation of IP-in-IP packaged type.
Embodiment:
Below in conjunction with drawings and Examples technical scheme of the present invention is further described.
In the present embodiment, OXC1 is two optical cross connection nodes that directly link to each other by optical fiber on the light network transmission with OXC2; Their corresponding nodes in control plane are the control section of OXC1 and the control section of OXC2, are separated by the multi-hop IP network, as shown in Figure 1.
The method that the link-state information passing through network that utilizes the present invention to propose is passed on, after in the node (control section of OXC1 and the control section of OXC2) on light network control system plane, respectively increasing a software module of carrying out the IP-in-IP encapsulation/decapsulation, the process that the link-state information passing through network is passed on to control plane node 2 (OXC2 control section) from control plane node 1 (OXC1 control section) as shown in Figure 2:
1. at control plane node 1, IP-in-IP encapsulation/decapsulation module is to by the ospf protocol mould
The OSPF route bag that piece produces encapsulates, and it adopts the mode of interprocess communication from OSPF
The data that the acquisition of protocol software module will encapsulate.The method of IP-in-IP encapsulation is a kind of mark
Accurate method for packing, the IP bag that it will encapsulate is placed in the new IP bag as payload,
Its packaged type as shown in Figure 3, the source address in the IP head of new IP bag adopts this node
Target control plane node address is adopted in address, destination address, and protocol number adopts IETF rule
Fixed 4, TTL (life-span) field is made as greater than 1, other word in the new external IP head
The content of section is the copy of the respective field in the IP head internally.Inner OSPF route bag
IP head and data do not make any change.
2. after being sent by light network control system plane node by the route bag after the encapsulation, when this route bag process
During router in the IP network of place, light network control system plane, these routers can be this IP bag
Being used as the general data bag transmits.
3. when the arrival destination node was control plane node 2, destination node was differentiated the protocol number of its IP bag,
When being 89, the protocol number that is checked through this IP bag just abandons this IP bag, when finding that protocol number is
Just this IP bag was transferred to decapsulation module at 4 o'clock and handle, decapsulation module will have by decapsulation
Imitate load and take out, transfer to ospf protocol resume module in the node by interprocess communication,
Thereby finish the ospf protocol data communication, realized description light network transmission plane Link State
The reception and registration of the OSPF route bag of information.
Whole solution just for each node in the light network control system plane has increased the encapsulation/decapsulation module, and does not change ospf protocol itself to the change of original system, makes scheme simple possible and have versatility.Packing forms adopts the IP-in-IP method, can satisfy under the prerequisite of hiding inner OSPF route bag fully, method for packing such as generic route encapsulation (GRE) with other standards, IP-in-UDP etc. compare, if all do not use the Optional Field of IP head, the IP-in-IP encapsulation will make each OSPF route packet length increase 160bit, adopt GRE then to need to increase greater than 192bit, adopt IP-in-UDP then to need to increase 224bit, as seen adopt the IP-in-IP mode to have the little advantage of encapsulation cost, can guarantee that the reception and registration of light network control system plane transmits the efficient of plane link-state information.This invention can be used as to solve fully passes through the solution that the multi-hop IP network is passed on transmission plane link-state information between light network control system plane node, thereby light network control system plane can unrestrictedly be run in the various IP network.
Claims (1)
1, the method that a kind of link-state information passing through network is passed on, it is characterized in that: in the node on each light network control system plane, increase an IP-in-IP encapsulation/decapsulation module, to send in the control plane node of Link State descriptor at each, the description that is produced by open shortest path ospf protocol module is transmitted the routing IP bag of plane link-state information as data, transferring to package module by interprocess communication encapsulates it, the new IP head that adds adopts this machine address as source IP address, adopt purpose control plane node address as purpose IP address, the node of control plane judges whether that by differentiating its protocol number the packet of receiving is transferred to decapsulation module to be handled to the IP bag of receiving, to the OSPF route bag that does not encapsulate, then it is abandoned, to the OSPF route bag that encapsulated, transferring to decapsulation module handles, decapsulation module is taken out and wherein is encapsulated in inner OSPF route bag, surrender the ospf protocol module by interprocess communication again and handle, finish the reception and registration of link-state information passing through network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03114923 CN1202638C (en) | 2003-01-16 | 2003-01-16 | Method for delivering link state information to pass through network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03114923 CN1202638C (en) | 2003-01-16 | 2003-01-16 | Method for delivering link state information to pass through network |
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| CN1431797A CN1431797A (en) | 2003-07-23 |
| CN1202638C true CN1202638C (en) | 2005-05-18 |
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| CN 03114923 Expired - Fee Related CN1202638C (en) | 2003-01-16 | 2003-01-16 | Method for delivering link state information to pass through network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11374836B1 (en) | 2020-12-09 | 2022-06-28 | Microsoft Technology Licensing, Llc | Network link testing using IP-in-IP encapsulation |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4491652B2 (en) * | 2003-10-24 | 2010-06-30 | テレフオンアクチーボラゲット エル エム エリクソン（パブル） | Apparatus and method for controlling service progress between different domains |
| CN1791004B (en) * | 2004-12-15 | 2010-05-05 | 北京邮电大学 | Novel asymmetric vector network topology abstract method |
| CN100438496C (en) * | 2004-12-19 | 2008-11-26 | 华为技术有限公司 | Network transmission method for multi-protocol label exchange VPN |
| CN100550899C (en) * | 2005-02-21 | 2009-10-14 | 华为技术有限公司 | The implementation method of dispersing link state information in the optical-fiber network |
| CN100431314C (en) * | 2005-05-08 | 2008-11-05 | 中兴通讯股份有限公司 | Method for maintaining and controlling plane attainable information in automatic exchanging optical network |
| CN100417117C (en) * | 2005-06-15 | 2008-09-03 | 华为技术有限公司 | Method for recognizing node accessibility in automatically switched optical network |
| CN100527745C (en) * | 2006-12-31 | 2009-08-12 | 中国科学院计算技术研究所 | A LSA passive collection method under the OSPF full adjacent connection condition |
| EP2760173B1 (en) * | 2011-09-27 | 2018-08-08 | Huawei Technologies Co., Ltd. | Data transmission method, device and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11374836B1 (en) | 2020-12-09 | 2022-06-28 | Microsoft Technology Licensing, Llc | Network link testing using IP-in-IP encapsulation |
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