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The similarities and differences between industrial... 1. definition of industrial 4G router and industrial switch   Industrial 4G router:   Industrial 4G router is a network device responsible for path finding. It provides users with communication by finding the least communication from multiple paths in the interconnection network. Industrial 4G router...

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4g router features of E-lins Technology With the development of new communication technologies and the continuous improvement of network efficiency and function of wireless communication, 4G has been widely used. 4G industrial-grade wireless routers are playing an increasingly important role in the applications of various industries, and the price is getting...

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E-Lins Industrial router applications Industrial-grade routers as Internet network layer communication equipment application in all walks of life, brought a lot of convenience for our industry. "E-Lins" introduce the application of industrial router scenario analysis.   1 The self-service terminal network   E-lins industrial router networking...

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Classification of 4G industrial routers There are many types of 4G industrial routers, which can be divided into different categories from different perspectives. Different types of 4G industrial routers can be used in different environments. The following sections classify the 4G industrial routers from different perspectives. According to the performance From...

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Dual SIM Router vs. Dual Radio Router Projects are looking to save their enterprises time and money ask us this very often: “When would I need to use dual SIMs, and in what situations should I consider dual radio dual sim router?” In order to make this clear, let’s take a quick look at the dual SIM and dual SIM dual radio module functionality. Dual...

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工业级全网路由器LSA本身可以floodin到整个互联网络

文章目录 : 产品文章

OSPF泛洪【工业路由器

Flooding采用2种报文 LSU Type 4—链路状态更新报文 LSA Type 5—链路状态确认报文

个链路状态更新报文和确认报文都可以携带多个LSA。工业级全网路由器LSA本身可以floodin到整个互联网络,但更新报文和确认报文只能在具有邻接关系的两个节点之间传送。4g路由器

在P-P网络,工业无线路由器是以组播方式将更新报文发送到组播地址224.0.0.5 在P-MP和虚链路网络,工业级路由器以单播方式将更新报文发送至邻接邻居的接口地址 在广播型网络,DRother工业路由器只能和DR&BDR形成邻接关系,所以更新报文将发送到224.0.0.6,相应的DR以224.0.0.5泛洪LSA并且BDR只接收LSA,不会确认和泛洪这些更新,除非DR失效 在NBMA型网络,LSA以单播方式发送到DR BDR,并且DR以单播方式发送这些更新 工业全网路由器LSA的洪泛是可靠的,所以必须对每1个发送的LSA进行确认,确认分隐式确认(Implicit Acknowledge)和显式确认(Explicit Acknowledge)

当工业级无线路由器要发送LSA的时候,会把LSA的拷贝放在链路状态重传列表中,这个LSA每隔RxmtInterval重传1次,直到该LSA得到确认,或邻接关系中断.无论哪种网络类型,重传的全网通工业路由器LSA总是以unicast的方式发送的确认可以是delayed或direct,前者可以使用1个LSAck确认多个LSA,当然这个延迟的时间必须小于RxmtInterval;后者的确认是立即发送,采用单播的方式.当出现下面2种情况的时候将采用直接确认:

1.从邻居那里收到了重复的LSA

2.全网通工业级路由器LSA的老化时间(Age)达到最大生存时间(MaxAge)

查看LSDB信息,使用show ip ospf database命令,如下:

LSA通过序列号,校验和,和老化时间保证LSDB中的LSA是最新的

Seq: 序列号(Seq)的范围是0×80000001到0x7fffffff

Checksum: 校验和(Checksum)计算除了Age字段以外的所有字段,每5分钟校验1次

Age: 范围是0到3600秒,16位长.当工业级4G路由器发出1个LSA后,就把Age设置为0,当这个LSA经过1台工业4G路由器以后,Age就会增加1个由InfTransDelay设定的时间(默认为1秒,这个时间可以通过命令ip ospf transmit-delay 修改).LSA保存在LSDB中的时候,老化时间也会增加

当收到相同的LSA的多个实例的时候,将通过下面的方法来确定哪个LSA是最新的:

1. 比较工业全网通路由器LSA实例的序列号,越大的越新

2. 如果序列号相同,就比较校验和,越大越新

3. 如果校验和也相同,就比较老化时间,如果只有1个LSA拥有MaxAge(3600秒)的老化时间,它就是最新的

4. 如果工业级全网通路由器LSA老化时间相差15分钟以上,(叫做MaxAgeDiff),老化时间越小的越新

5. 如果上述都无法区分,则认为这2个LSA是相同的

标签:无线路由器    全网通路由器

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