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The detailed difference between 4G industrial router...   4G industrial router and 4G DTU both realize the wireless network data transmission function, and the differences between them are mainly from the use method, appearance interface and application environment, etc. Today, we will introduce some differences between 4G router and 4G DTU.   Different methods...

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Application analysis of iot sensing technology   The Internet of things (iot) is widely used in the integration of networks through intelligent perception, recognition technology, pervasive computing and other communication perception technologies. The iot is understood as "Internet connected by things". The Internet of things (iot) connects all objects with...

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What is a single/dual frequency wireless 4G router 1. Introduction to "single frequency" router The single-frequency router only works in the 2.4ghz band, which is generally supported by wireless terminals. However, the 2.4ghz band has large interference, which may affect the wireless rate and stability.   2. Introduction to "dual-frequency" router Dual-frequency...

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Wireless communication DTU features Data Transfer unit (DTU) is a wireless terminal device specially used to convert serial Data into IP Data or convert IP Data into serial Data for transmission through wireless communication network.   DTU advantages: Rapid and flexible network, short construction cycle, low cost; Wide network coverage; Good...

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The advantage of using wireless data transmission module... Data transmission can be simply divided into two major types: wired (including the installation of optical cables, cables or leased telecommunication lines) and wireless (including the establishment of dedicated wireless data transmission system or the borrowing of CDPD, GSM, CDMA and other public network information platforms).     In...

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工业路由器OSPF建立邻居到LSA的互换的交换过程

文章目录 : 产品文章

工业路由器OSPF建立邻居,到LSA的互换,到路由表的计算,需要经过一系列的工业级路由器数据包交换过程,过程如下:

Hello

Database Description Packets (DBD)

Link-state Request (LSR)

Link-state update(LSU)

LSDB

具体情况如下:

Hello

Hello包是用来建立和维护工业无线路由器OSPF邻居的,要交换LSA,必须先通过Hello包建立工业级无线路由器OSPF邻居。

Database Description Packets (DBD)【无线路由器

当一个人去书店买书时,想要决定买哪本书,并不会先将书店里所有的书都看一遍,才做决定买哪本好,通常是只看书的目录,或者大概翻一翻,再对比一下,就能决定买哪本;而工业4G路由器OSPF的工业级4G路由器LSA交换也是一样的,邻居建立之后,并不会立刻就将自己链路状态数据库中所有的工业LTE路由器LSA全部发给邻居,而是将LSA的基本描述信息发给邻居,这就是Database Description Packets (DBD),是LSA的目录信息,相当于书的目录,邻居在看完全网通工业级路由器DBD之后,就能知道哪些LSA是需要邻居发送给自己的。

Link-state Request (LSR)

邻居在看完发来的工业级LTE路由器LSA描述信息(DBD)之后,就知道哪些LSA是需要邻居发送给自己的,自己就会向邻居发送LSA请求(LSR),告诉邻居自己需要哪些LSA。

Link-state update(LSU)

当邻居收到其它全网通工业路由器发来的LSA请求(LSR)之后,就知道对方需要哪些LSA,然后根据LSR,将完整的工业级全网通路由器LSA内容全部发给邻居,以供计算路由表。

LSDB

就是已经收到了所有需要邻居发给自己的工业全网通路由器LSA,这时的链路状态数据库已经达到收敛状态。全网通路由器

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