CN105306362A - Internet protocol version 6 (IPv6) based open shortest path first (OSPF) network routing information passive collection method and system - Google Patents
Internet protocol version 6 (IPv6) based open shortest path first (OSPF) network routing information passive collection method and system Download PDFInfo
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- CN105306362A CN105306362A CN201510598802.1A CN201510598802A CN105306362A CN 105306362 A CN105306362 A CN 105306362A CN 201510598802 A CN201510598802 A CN 201510598802A CN 105306362 A CN105306362 A CN 105306362A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
- H04L45/123—Evaluation of link metrics
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Abstract
The invention relates to the technical field of network measurement, and more particularly to an internet protocol version 6 (IPv6) based open shortest path first (OSPF) network routing information passive collection method and system. The method comprises steps that an adjacency relation between routers in an IPv6 network is established, only a Hello message is sent between the routers so as to maintain a necessary adjacency relation, when a certain router receives link state advertisement information, the router directly sends the link state advertisement information to an adjacent router; and if the OSPF network in the IPv6 network is a multi-autonomous domain OSPF network, a full adjacency relation is established between a collection device and the router in each autonomous domain, and a tag is arranged at the head of a collected message, wherein the tag identifies the IP address of a sender of the collected message, and an autonomous system (AS) number, in which the collected message is, is determined according to the correspondence between the IP address and the AS number. According to the method, the OSPF routing information of the ASs of a plurality of autonomous domains is collected; and the method can collect information in a passive manner, does not affect the network environment, and can collect information in real time.
Description
Technical field
The present invention relates to Network Measurement Technologies field, particularly relate to the passive acquisition method based on the ospf network routing iinformation of IPV6 and system.
Background technology
Along with the develop rapidly of the Internet and the continuous renewal of Internet of Things and cloud computing technology, quantity and the scale of the network equipment and mobile terminal are doubled and redoubled, and the address space of IPV4 is once well sold and in short supply.In order to address this problem, new a set of consensus standard IPv6 that Internet Engineering Task tissue (IETF) is developed, on existing Internet protocol IP v4 basis, address space is expanded, better achieve Multicast function, add Design of Information System Security Architecture, preferably resolve IPv4 problems faced.The network size of current IPv6 grows stronger day by day, and progressively substitutes IPv4.
OSPF (OpenShortestPathFirst SPF) is a kind of Routing Protocol of typical Link State (Link-state), for in single autonomous system (AutonomousSystem, AS) internal decision making route.Because it has fast convergence rate, occupied bandwidth is few, supports the plurality of advantages such as VLSM, becomes current the most widely used Interior Gateway Protocol.Simultaneously OSPF Routing Protocol provides good support to IPv6 network, the basis of ospf protocol version 2 is carried out perfect, has issued OSPFv3, be used for supporting that the routing iinformation under IPv6 network is selected.Along with the Internet is to the development of IPv6, OSPFv3 will better be applied.
In traditional routing iinformation acquisition scheme, the router of collecting device and access network sets up syntople, and in region, other routers all regard access device as common router.In such a mode, the routing iinformation data that collecting device obtains have good real-time, but too much influence can not be caused to monitored network in order to ensure the access of collecting device, need between collecting device and couple in router, configure filter and access control list.And collecting device by other router senses in network, and for router-level topology, so inevitably cause the unsteadiness of collecting device can directly expand to whole network, can impact other equipment under this mode.
Patent of invention " a kind of method and apparatus based on Open Shortest Path First ospf protocol sets up neighborhood ", be applied to the network equipment supporting ospf protocol, described method comprises: send neighbor advertisement message by ospf interface to opposite equip.; Described neighbor advertisement message carries the default mark for identifying the ospf interface type sending this neighbor advertisement message; Receive the neighbor advertisement message from described opposite equip., described default mark according to carrying in the neighbor advertisement message received carries out interface type matching check, and check out interface type that the default mark carried in this neighbor advertisement message identifies and this equipment receive the type of the interface of this neighbor advertisement message identical time, continue to set up with the neighborhood of described opposite equip. according to agreement and carry out neighborhood maintenance.By this invention, foundation and the maintenance of invalid neighbours can be limited.But this invention mainly presets mark when ospf protocol sets up syntople, interface type matching check is carried out according to the default mark in the neighbor advertisement message received, prevent the foundation of invalid neighbours, but in the present invention, mainly for the passive collection of OSPF message, can not have any impact to the topology of collection network, when neighborhood is set up, the priority of collecting device is set to minimum, avoid collecting device to elect as DR, increase collecting device burden.
Patent of invention " a kind of message processing method and device ", relates to the communications field, reduces the generation of OSPFv3 neighbours' oscillatory condition repeatedly to a certain extent, comprising: receive ospf OSPFv3 protocol massages; The OSPFv3 protocol massages being used for data syn-chronization is stored in the high buffer queue of priority; The non-OSPFv3 protocol massages for data syn-chronization is stored in the low buffer queue of priority; According to the OSPFv3 protocol massages in each buffer queue of sequence process of priority.The method that this invention provides is applied to sets up neighbours.But this invention is mainly for the reception of OSPFv3 message and buffer memory, by the packet storage of OSPFv3 in the high buffer queue of priority, process according to the sequence of priority, the present invention is mainly for the collection of message, the method of OSPFv3 message is mainly obtained when not affecting network condition, be intended to the existence of hiding collecting device, achieve the collection of multiple Autonomous Domain, ensure that the correctness of message information independence in different Autonomous Domain and image data.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes based on the passive acquisition method of the ospf network routing iinformation of IPV6 and system.
The present invention proposes a kind of passive acquisition method of the ospf network routing iinformation based on IPv6, comprising:
Single Autonomous Domain ospf network obtaining information step, set up the syntople between router in IPv6 network, wherein only send hello packet between router and maintain necessary syntople, after certain router receives link state notification information, send described link state notification information directly to neighbor router;
Many Autonomous Domains ospf network obtaining information step, if ospf network is many Autonomous Domains ospf network in IPv6 network, router in collecting device and each Autonomous Domain sets up full adjacency, and the head gathering message is arranged a label, the IP address of the transmit leg of message is gathered, determined the message place collected by the corresponding relation of described IP address and No. AS No. AS described in described tag identifier.
The passive acquisition method of the described ospf network routing iinformation based on IPv6, also comprise before described single Autonomous Domain ospf network obtaining information step: every platform router passes through hello packet, DR is elected according to router priority separately, and and set up syntople between the neighbor router of DR, every platform router sends link state notification information to each neighbor router, the neighbours conversion link state advertisement information of each neighbor router successively to described each neighbor router after receiving link state notification information.
The passive acquisition method of the described ospf network routing iinformation based on IPv6, every platform router preserves the backup of the link state notification information that this router a receives in a database, and all-router safeguards a identical database.
The passive acquisition method of the described ospf network routing iinformation based on IPv6, described single Autonomous Domain ospf network obtaining information step also comprises: be set to minimum by the priority of collecting device; The Data Description (DD) packet that each router and neighbor router exchange is empty; Router stops sending LSU after setting up syntople.
The passive acquisition method of the described ospf network routing iinformation based on IPv6, when described many Autonomous Domains ospf network obtaining information step also comprises the syntople set up between router, the link state notification information that database description switching phase sends is empty, and reduces to minimum by the priority of collecting device.
The present invention also proposes a kind of passive acquisition system of the ospf network routing iinformation based on IPv6, comprising:
Single Autonomous Domain ospf network obtaining information module, for setting up the syntople in IPv6 network between router, wherein only send hello packet between router and maintain necessary syntople, after certain router receives link state notification information, send described link state notification information directly to neighbor router;
Many Autonomous Domains ospf network obtaining information module, if be many Autonomous Domains ospf network for ospf network in IPv6 network, router in collecting device and each Autonomous Domain sets up full adjacency, and the head gathering message is arranged a label, the IP address of the transmit leg of message is gathered, determined the message place collected by the corresponding relation of described IP address and No. AS No. AS described in described tag identifier.
The passive acquisition system of the described ospf network routing iinformation based on IPv6, also comprise: every platform router passes through hello packet, DR is elected according to router priority separately, and and set up syntople between the neighbor router of DR, every platform router sends link state notification information to each neighbor router, the neighbours conversion link state advertisement information of each neighbor router successively to described each neighbor router after receiving link state notification information.
The passive acquisition system of the described ospf network routing iinformation based on IPv6, every platform router preserves the backup of the link state notification information that this router a receives in a database, and all-router safeguards a identical database.
The passive acquisition system of the described ospf network routing iinformation based on IPv6, described single Autonomous Domain ospf network obtaining information module also comprises: be set to minimum by the priority of collecting device; The Data Description (DD) packet that each router and neighbor router exchange is empty; Router stops sending LSU after setting up syntople.
The passive acquisition system of the described ospf network routing iinformation based on IPv6, when described many Autonomous Domains ospf network obtaining information step also comprises the syntople set up between router, the link state notification information that database description switching phase sends is empty, and reduces to minimum by the priority of collecting device.
From inventing above, the invention has the advantages that:
The present invention gathers the ospf routing information of multiple Autonomous Domain AS; Can passive type carry out information gathering, can not impact network environment; The present invention realizes the passive monitoring to monitoring network, effectively can avoid the situation in traditional acquisition scheme, collecting device being added network router-level topology, and collect comprehensive ospf routing information, ensures the real-time gathered simultaneously; The present invention, in the process gathering OSPF message, conceals the existence of collecting device, achieves the collection of multiple Autonomous Domain, ensure that the correctness of message information independence in different Autonomous Domain and image data.
Accompanying drawing explanation
Fig. 1 is that two routers foundation link flow chart entirely;
Fig. 2 is that distribution map is disposed in message collection.
Embodiment
The object of the invention is for current based on setting up syntople and the contradiction not affecting network topology in the ospf network environment of IPv6, propose the passive acquisition method based on the ospf network routing iinformation of IPV6 and system, to carry out real-time monitoring analysis to network condition, the collection solved in the middle of existing technologies is not comprehensive, network is impacted, gathers the problems such as poor real.
Be below concrete steps of the present invention, as follows:
The passive acquisition technique of OSPFv3 routing iinformation of single Autonomous Domain in IPV6 network:
In OSPFv3 network, the stage of routers exchange routing iinformation comprises two: before router sets up routing protocol neighbor relation and after router sets up routing protocol neighbor relation.
Before setting up syntople, every platform router, by using hello packet, elects DR according to respective priority and and sets up syntople between its neighbours.Every platform router sends LSA (LSA) to each neighbours, and each neighbours will forward these LSA (flooding) to its neighbours successively after receiving LSA.Every platform router will preserve the backup of a LSA that it receives in a database, and all-router safeguards a identical database, is called LSDB.Under normal circumstances, two routers set up the process of syntople as shown in Figure 1.
After setting up syntople, after setting up syntople between router, mutually no longer send the information such as DD (DatabaseDescription data specifying-information message), just send Hello and maintain necessary syntople, after certain router receives LSA, send the information of this LSA directly to neighbor router.
In order to realize the object of passive collection OSPFv3 network route information, have employed three kinds of measures and improving two above processes, as follows:
The priority of collecting device is set to minimum, in ospf network, the router setting up syntople will elect DR (DesignatedRouter Designed Router) to carry out the link-state information in this territory of inundation according to priority facility, to avoid being elected as DR when setting up full adjacency with the router in Autonomous Domain as collecting device, increase the burden of collecting device, affect the real-time that message gathers, therefore the priority of collecting device is set to minimum, does not participate in the election of DR;
The Data Description (DD) packet exchanged with neighbor router is empty, before syntople set up by collecting device and neighbor router, need to carry out the exchange of LSA database description, now collecting device is not to the LSA header information corresponding to neighbor router declaration collecting device, namely empty Data Description (DD) packet is sent, such neighbor router can not to any LSA information of collecting device request, to realize the object of passive collection routing iinformation, and neighbor router thinks that LSA information is all transmitted, and enters full adjacent state between router;
Router does not send LSU (LinkStateUpdate Link State Update Packet) after setting up syntople, after routing iinformation collecting device and neighbor router enter full adjacent state, the LSA message that neighbor router sends can be got, and collecting device can not send the LSA message of this syntople in network, thus realizes the object of passive collection.Because the LSA information of routing iinformation acquisition probe is not present in region, therefore a unidirectional limit is only had to exist between routing iinformation acquisition probe and neighbor router, and unidirectional limit can't be used for router-level topology in ospf protocol specification, achieve the requirement that passive type is monitored.
Many Autonomous Domains OSPFv3 network route information acquisition technique in IPV6 network:
The object of many Autonomous Domains OSPFv3 network route information collection is by a routing iinformation collecting device, OSPFv3 network route information in multiple Autonomous Domain can be collected, this kind of information gathering mode has many good qualities, such as: the deployment way of equipment can be made more flexible, realize making full use of of equipment simultaneously.
OSPFv3 is intra-area routes agreement, and message information is inundation in this Autonomous Domain only, so there is no ASNumber field, cannot distinguish No. AS (AutonomousSystem autonomous system).Certain router in collecting device and an Autonomous Domain sets up a full adjacency, obtains the message information of this Autonomous Domain.When there is multiple Autonomous Domain, collecting device needs to set up full adjacency with the router in each Autonomous Domain.In order to distinguish the message of different Autonomous Domain, need collection header to stamp a label, this tag identifier IP address of this routing iinformation transmit leg, determined the message place collected by the corresponding relation of this IP address and No. AS No. AS.
Simultaneously, the LSA information of different Autonomous Domain is there is in the LSDB of collecting device, when setting up syntople, must ensure that the LSA header information that database description switching phase sends is sky, and the priority of collecting device is reduced to minimum, guarantee that the OSPF message in different Autonomous Domains keeps independent, can not influence each other.
The present invention also proposes the passive acquisition system of the ospf network routing iinformation based on IPv6, comprising:
Every platform router passes through hello packet, DR is elected according to router priority separately, and and set up syntople between the neighbor router of DR, every platform router sends link state notification information to each neighbor router, the neighbours conversion link state advertisement information of each neighbor router successively to described each neighbor router after receiving link state notification information;
Single Autonomous Domain ospf network obtaining information module, for setting up the syntople in IPv6 network between router, wherein only send hello packet between router and maintain necessary syntople, after certain router receives link state notification information, send described link state notification information directly to neighbor router;
Many Autonomous Domains ospf network obtaining information module, if be many Autonomous Domains ospf network for ospf network in IPv6 network, router in collecting device and each Autonomous Domain sets up full adjacency, and the head gathering message is arranged a label, the IP address of the transmit leg of message is gathered, determined the message place collected by the corresponding relation of described IP address and No. AS No. AS described in described tag identifier.
Every platform router preserves the backup of the link state notification information that this router a receives in a database, and all-router safeguards a identical database.
Described single Autonomous Domain ospf network obtaining information module also comprises: be set to minimum by the priority of collecting device; The Data Description (DD) packet that each router and neighbor router exchange is empty; Router stops sending LSU after setting up syntople.
When described many Autonomous Domains ospf network obtaining information step also comprises the syntople set up between router, the link state notification information that database description switching phase sends is empty, and reduces to minimum by the priority of collecting device.
Be below one embodiment of the invention, as follows:
As shown in Figure 2, in the ospf network of the mono-AREA of many AS, a collecting device is disposed in network, start BGP and ospf protocol, BGP or ospf adjacency relation is set up with one or more the normal router in network, ensure the connectedness of this router and other routers, just can start to carry out the collecting work of route data.
Claims (10)
1., based on a passive acquisition method for the ospf network routing iinformation of IPv6, it is characterized in that, comprising:
Single Autonomous Domain ospf network obtaining information step, set up the syntople between router in IPv6 network, wherein only send hello packet between router and maintain necessary syntople, after certain router receives link state notification information, send described link state notification information directly to neighbor router;
Many Autonomous Domains ospf network obtaining information step, if ospf network is many Autonomous Domains ospf network in IPv6 network, router in collecting device and each Autonomous Domain sets up full adjacency, and the head gathering message is arranged a label, the IP address of the transmit leg of message is gathered, determined the message place collected by the corresponding relation of described IP address and No. AS No. AS described in described tag identifier.
2. as claimed in claim 1 based on the passive acquisition method of the ospf network routing iinformation of IPv6, it is characterized in that, also comprise before described single Autonomous Domain ospf network obtaining information step: every platform router passes through hello packet, DR is elected according to router priority separately, and and set up syntople between the neighbor router of DR, every platform router sends link state notification information to each neighbor router, the neighbours conversion link state advertisement information of each neighbor router successively to described each neighbor router after receiving link state notification information.
3. as claimed in claim 2 based on the passive acquisition method of the ospf network routing iinformation of IPv6, it is characterized in that, every platform router preserves the backup of the link state notification information that this router a receives in a database, and all-router safeguards a identical database.
4., as claimed in claim 1 based on the passive acquisition method of the ospf network routing iinformation of IPv6, it is characterized in that, described single Autonomous Domain ospf network obtaining information step also comprises: be set to minimum by the priority of collecting device; The Data Description (DD) packet that each router and neighbor router exchange is empty; Router stops sending LSU after setting up syntople.
5. as claimed in claim 1 based on the passive acquisition method of the ospf network routing iinformation of IPv6, it is characterized in that, when described many Autonomous Domains ospf network obtaining information step also comprises the syntople set up between router, the link state notification information that database description switching phase sends is empty, and reduces to minimum by the priority of collecting device.
6., based on a passive acquisition system for the ospf network routing iinformation of IPv6, it is characterized in that, comprising:
Single Autonomous Domain ospf network obtaining information module, for setting up the syntople in IPv6 network between router, wherein only send hello packet between router and maintain necessary syntople, after certain router receives link state notification information, send described link state notification information directly to neighbor router;
Many Autonomous Domains ospf network obtaining information module, if be many Autonomous Domains ospf network for ospf network in IPv6 network, router in collecting device and each Autonomous Domain sets up full adjacency, and the head gathering message is arranged a label, the IP address of the transmit leg of message is gathered, determined the message place collected by the corresponding relation of described IP address and No. AS No. AS described in described tag identifier.
7. as claimed in claim 6 based on the passive acquisition system of the ospf network routing iinformation of IPv6, it is characterized in that, also comprise: every platform router passes through hello packet, DR is elected according to router priority separately, and and set up syntople between the neighbor router of DR, every platform router sends link state notification information to each neighbor router, the neighbours conversion link state advertisement information of each neighbor router successively to described each neighbor router after receiving link state notification information.
8. as claimed in claim 7 based on the passive acquisition system of the ospf network routing iinformation of IPv6, it is characterized in that, every platform router preserves the backup of the link state notification information that this router a receives in a database, and all-router safeguards a identical database.
9., as claimed in claim 6 based on the passive acquisition system of the ospf network routing iinformation of IPv6, it is characterized in that, described single Autonomous Domain ospf network obtaining information module also comprises: be set to minimum by the priority of collecting device; The Data Description (DD) packet that each router and neighbor router exchange is empty; Router stops sending LSU after setting up syntople.
10. as claimed in claim 1 based on the passive acquisition system of the ospf network routing iinformation of IPv6, it is characterized in that, when described many Autonomous Domains ospf network obtaining information step also comprises the syntople set up between router, the link state notification information that database description switching phase sends is empty, and reduces to minimum by the priority of collecting device.
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| CN105306362B (en) | 2018-08-10 |
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