CN103997457B - Method for realizing OSPF unnumbered broadcast and NBMA interface - Google Patents
Method for realizing OSPF unnumbered broadcast and NBMA interface Download PDFInfo
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- CN103997457B CN103997457B CN201410244844.0A CN201410244844A CN103997457B CN 103997457 B CN103997457 B CN 103997457B CN 201410244844 A CN201410244844 A CN 201410244844A CN 103997457 B CN103997457 B CN 103997457B
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Abstract
The invention discloses a method for realizing an OSPF unnumbered broadcast and NBMA interface, which transmits and synchronizes network and interface attributes along with HE LL O messages in a subnet where the interface is positioned, shields all legality checks required to be in the same network segment in OSPF processing on the unnumbered broadcast and NBMA interface, generates a network identifier which is unique in the whole network after DR and BDR are selected, dynamically generates L SA according to the network identifier, shields the routing output of network nodes and routing nodes in OSPF shortest path tree calculation, and only outputs Stub leaf routing.
Description
Technical field
The present invention relates to the applicability technology of OSPF Routing Protocols, more particularly to a kind of OSPF without numbering broadcast,
The implementation method of nbma interface.
Background technology
With the lifting of development and the user demand of technology, in broadcast（Broadcast）、NBMA（Non-broadcasting multicast communication）
Realize on style interface and communicate without numbering, since existing ospf protocol enables on without numbering broadcast and nbma interface
After cannot normally restrain and be restricted.This just needs to seek support in the ospf protocol connects without numbering broadcast and NBMA
The solution of mouth type.
The content of the invention
The present invention proposes a kind of implementation methods of OSPF without numbering broadcast, nbma interface, and this method is by network
With interface attributes with " the Network Mask " in HELLO messages（Subnet mask）Field subnet where interface is transmitted together
Step.Shielding requires the legitimacy inspection in the same network segment in OSPF processing on without numbering broadcast, nbma interface
Look into.After the completion of DR, bdr election, the unique network identity of the whole network will be generated after the network attribute of DR and interface attributes combination, then
According to this network identity dynamic generation LSA.The route of network node and routing node is shielded in the calculating of OSPF shortest path trees
Output, only exports Stub leaves route.Network attribute refers to some network segment for the router for enabling ospf protocol, and the network segment is complete
Net is unique, and without size network segment relation.Interface attributes refer to refer to the router that enables ospf protocol without numbering broadcast or
Interface sequence number without numbering nbma interface, unique mark interface in this router.By DR source addresses and corresponding mask phase
With income value, then with corresponding interface sequence number be added generation the unique network identity of the whole network.
It is described to refer to utilize " the Network Mask " in HELLO messages with HELLO messages（Subnet mask）Field represents
Network and interface attributes.“Network Mask”（Subnet mask）Field identification method is as follows：
A) ospf interface is when having numbering, which is ospf interface mask；
B) when ospf interface is without numbering point-to-point, which is 0；
C) when ospf interface is without numbering point-to-point, the highest bit of the field is 0, other 31 bits represent network category
The netmask digit of property and the interface identifier of interface attributes.
The transmission synchronously refers to that each OSPF is reported without numbering broadcast or nbma interface by the HELLO of above-mentioned mark
Source address of the text using network attribute as the message is transmitted in corresponding interface.After HELLO messages are received, by HELLO messages
In " Network Mask "（Subnet mask）Field contents and message source address are taken out, and are stored, updated and safeguarded.
The method according to this network identity dynamic generation LSA is as follows：
1）With the Link id fields of the Router-LSA of the unique network identity filling OSPF of the whole network；
2）With the link-state ID field of the unique network identity filling Network-LSA of the whole network；
3）With the Link Data of the Router-LSA of interface identifier filling OSPF；
4）The Network Mask fields of Network-LSA are set to complete 1.
The method have the benefit that：Provide a kind of realization sides of OSPF without numbering broadcast, nbma interface
Method, reduces ospf protocol expense, improves user networking experience.
Embodiment
In existing OSPF technologies, numbering is only supported in broadcast, nbma interface, in no numbering
After enabling ospf protocol under broadcast, nbma interface, ospf protocol cannot normally restrain, so that influencing routing table causes to lead to
Letter interrupts.
Implementation methods of the OSPF proposed by the present invention without numbering broadcast, nbma interface, by building HELLO messages
In " Network Mask "（Subnet mask）Field, transmits respective network in the network where broadcast, nbma interface
And interface attributes, the generation for follow-up LSA messages provide information resources, original mechanism of OSPF is recycled to carry out the whole network synchronization
Calculate with topology, lead to not normally because being introduced without numbering broadcast, nbma interface so as to solve existing OSPF technologies
The problem of convergence.
1）It is unique that a whole network is chosen in the router, and without the size network segment relation network segment, with the network segment in the router
Interface IP address as the source address that OSPF messages are sent without numbering broadcast, nbma interface, netmask is converted to mask
Digit is filled in " the Network Mask " of HELLO messages（Subnet mask）In field.
2）The interface identifier without numbering broadcast, nbma interface of router is filled in HELLO messages
“Network Mask”（Subnet mask）In field.
3）" Network Mask " in HELLO messages（Subnet mask）Field represents network and interface attributes.
“Network Mask”（Subnet mask）Field identification method is as follows：
A) ospf interface is when having numbering, which is ospf interface mask；
B) when ospf interface is without numbering point-to-point, which is 0；
C) when ospf interface is without numbering point-to-point, the highest bit of the field is 0, other 31 bits represent network category
The netmask digit of property and the interface identifier of interface attributes.
4）Shielding requires the conjunction in the same network segment in OSPF processing on without numbering broadcast, nbma interface
Method inspection.
5）After OSPF receives HELLO messages without numbering broadcast or nbma interface, by HELLO messages
“Network Mask”（Subnet mask）The source address of field contents and message is taken out and is stored, updated and safeguarded.
6）After the completion of DR, bdr election, switching, the source address of the DR in the database by HELLO packet storages with
Corresponding mask phase is with obtaining unique network segment；Unique network segment is added to obtain the unique network mark of the whole network with corresponding interface identifier again
Know.
7）The method that new LSA is produced according to the unique network identity of the whole network of generation is as follows：
A) the Link id fields of the Router-LSA of OSPF are filled with the unique network identity of the whole network；
B) with the link-state ID field of the unique network identity filling Network-LSA of the whole network；
C) the Link Data of the Router-LSA of OSPF are filled with interface identifier；
D) the Network Mask fields of Network-LSA are set to complete 1.
8）The route output of network node and routing node is shielded in the calculating of OSPF shortest path trees, only exports Stub leaves
Sub-route.
By above step it can be seen that this method has following advantage：Real without numbering broadcast, nbma interface
Ospf protocol technology is showed, so as to solve existing OSPF technologies because causing nothing without numbering broadcast, nbma interface introducing
The problem of method normally restrains.Due to the introducing of no numbering, ospf protocol expense is greatly reducing, improves user group dictyosome
Test.
Claims (4)
- A kind of 1. implementation methods of OSPF without numbering broadcast, nbma interface, it is characterised in that：By network attribute and interface Attribute is with " the Network Mask " in HELLO messages（Subnet mask）Field subnet where interface is transmitted synchronization； The validity checking in the same network segment is required without shielding in the OSPF processing on numbering broadcast, nbma interface； After the completion of DR, bdr election, by the network attribute of DR and the unique network identity of interface attributes combination producing the whole network, further according to this Network identity dynamic generation LSA；The route output of network node and routing node is shielded in the calculating of OSPF shortest path trees, only Export Stub leaves route；Network attribute refers to some network segment for the router for enabling ospf protocol, and the network segment is unique in the whole network, And without size network segment relation；The router that interface attributes refer to enable ospf protocol without numbering broadcast or without numbering The interface sequence number of nbma interface；By DR source addresses and corresponding mask phase and income value, then it is added and gives birth to corresponding interface sequence number Into the unique network identity of the whole network.
- 2. a kind of implementation methods of the OSPF according to claim 1 without numbering broadcast, nbma interface, its feature exist In：“Network Mask”（Subnet mask）Field identification method is as follows：A) ospf interface is when having numbering, which is ospf interface mask；B) when ospf interface is without numbering point-to-point, which is 0；C) when ospf interface is without numbering point-to-multipoint, the highest bit of the field is 0, remaining 31 bit is the unique net of the whole network Network identifies.
- 3. a kind of implementation methods of the OSPF according to claim 1 without numbering broadcast, nbma interface, its feature exist In：Transmission synchronously refers to HELLO messages of each OSPF without numbering broadcast or nbma interface transmission using network attribute as this The source address of message, after HELLO messages are received, by " the Network Mask " in HELLO messages（Subnet mask）In field Hold and the source address of message is taken out, and stored, updated and safeguarded.
- 4. a kind of implementation methods of the OSPF according to claim 1 without numbering broadcast, nbma interface, its feature exist In：It is as follows according to the method for this network identity dynamic generation LSA：A) the Link id fields of the Router-LSA of OSPF are filled with the unique network identity of the whole network；B) with the link-state ID field of the unique network identity filling Network-LSA of the whole network；C) the Link Data of the Router-LSA of OSPF are filled with interface identifier；D) the Network Mask fields of Network-LSA are set to complete 1.
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| CN1905560B (en) * | 2006-08-09 | 2010-12-08 | 烽火通信科技股份有限公司 | Method of using non-number port in route protocol based on IPV4 |
| US8958305B2 (en) * | 2009-10-30 | 2015-02-17 | Juniper Networks, Inc. | OSPF point-to-multipoint over broadcast or NBMA mode |
| WO2012103731A1 (en) * | 2011-06-30 | 2012-08-09 | 华为技术有限公司 | Method and device for establishing router neighbor |
| CN103023775B (en) * | 2012-12-26 | 2015-11-25 | 杭州华三通信技术有限公司 | Router in ospf network and processing method thereof |
| CN103236980A (en) * | 2013-04-07 | 2013-08-07 | 中国电子科技集团公司第三十研究所 | Router and method for implementing unnumbered broadcasting ports of router |
| CN103825760B (en) * | 2014-02-25 | 2017-06-06 | 新华三技术有限公司 | A kind of method and apparatus that neighborhood is set up based on ospf protocol |
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