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Industrial-grade 4G router TCP/IP network architecture 1. Layering of TCP/IP network system   TCP/IP (TransmissionControlProtocol/InternetProtocol), transmission control protocol/Internet protocol. It was developed by the defense advanced research projects agency in the 1970s, and was later integrated into UNIX and popularized. It emerged in the 1980s as the Internet's...

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The structure of 4G DTU The main function of DTU is to transmit data from remote devices back to the background center via wired/wireless. Different data transmission modes of DTU include all-network-connected DTU, GPRS DTU, WIFI DTU, CAN DTU and 4G DTU. Today, we will have a look at the structure and work flow of DTU.   To complete...

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The use of industrial wireless routers Industrial-grade wireless router adopts high performance 32-bit industrial-grade ARM9 communication processor, which is widely used in finance, electric power, postal, water conservancy, environmental protection, meteorology and other industries.   Industrial router is mainly used in intelligent transportation,...

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Cascade and stack of industrial-grade 4G routers The most basic star Ethernet architecture, the actual star enterprise network may be much more complex than this. This renaturation is not only reflected in how high-end network equipment, how complex configuration, more importantly, the performance of network switching level is more complex. Industrial routers and firewalls...

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工业4G路由器BGP邻居的flaping

文章目录 : 产品文章

•工业路由器通过IGP学到对方loopback,并用looback建EBGP邻居

•又在BGP中通告此loopback。此时BGP邻居会出现flaping

R1和R2之间运行一个IGP协议,比如说EIGRP。将环回口都宣告进去,这样R1和R2相互之间就有对方环回口的工业级路由器路由了,然后再用环回口建立EBGP邻居关系。最后再把2.2.2.0和1.1.1.0的环回口宣告进BGP。这时你会发现工业无线路由器BGP路由会发生flapping。

原因一:无线路由器

•首先R1和R2之间运行了EIGRP,学到对方的环回口工业级无线路由器路由是一条EIGRP路由,管理距离是90

•而当这两个环回口宣告进BGP后,R1和R2又通过BGP学到对方环回口路由,管理距离是20

•这时,全网工业级路由器BGP路由由于管理距离最小,会进入全网工业路由器路由表,取代EIGRP路由

•问题在于,现在的全网通工业路由器BGP路由是有问题的,下一跳是不可达的

R2收到的1.1.1.0的BGP路由下一跳是R1的环回口1.1.1.1

R1收到的2.2.2.0的BGP路由下一跳是R2的环回口2.2.2.2

•BGP有一个检查机制,每60S检查一次BGP路由,看是否有效,60S后就会检查到这些工业级全网通路由器路由并设为无效

•BGP路由无效以后,在路由表中就没有了,EIGRP路由又起作用了。

•有了EIGRP路由,BGP路由的下一跳有可达了。又有效了。

•BGP邻居有效以后,又会抢占了EIGRP路由的地位,又会导致全网通工业级路由器BGP路由下一跳不可达。

原因二:4g路由器

•首先R1和R2之间运行了EIGRP,学到对方的环回口工业全网通路由器路由是一条EIGRP路由,管理距离是90

•而当这两个环回口宣告进BGP后,R1和R2又通过BGP学到对方环回口路由,管理距离是20

•这时,工业级全网路由器BGP路由由于管理距离最小,会进入路由表,取代EIGRP路由

•问题在于,现在的工业4G路由器BGP路由是有问题的,下一跳是不可达的

R2收到的1.1.1.0的工业级4G路由器BGP路由下一跳是R1的环回口1.1.1.1

R1收到的2.2.2.0的BGP路由下一跳是R2的环回口2.2.2.2

•路由不可达就造成两个邻居之间没法发送keeplive

•180S后BGP邻居关系超时,并DOWN掉。这时EIGRP路由又起作用了。

•有了EIGRP路由,BGP邻居关系又可以建立了。

•BGP邻居有效以后,工业全网路由器BGP路由又会抢占了EIGRP路由的地位,又会导致BGP邻居再一次DOWN掉。

标签:全网通路由器    全网通4g路由器

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