八、基于BGP实现两个AS系统间通信

上传者: 33782021 | 上传时间: 2022-09-22 14:04:50 | 文件大小: 55KB | 文件类型: ZIP
AS内部的路由器使用相同的路由选择协议和共同的度量,以确定分组在该AS内的路由。当前,路由选择协议分为两类: 1)内部网关协议IGP(Internet Gateway Protocol)。AS内部使用的路由选择协议,常用的由RIP和OSPF。 2)外部网关协议EGP(External Gateway Protocol)。源主机与目的主机在不同AS中,当数据包传到一个AS的边界时,就需要使用一种协议将路由信息传递到另一个AS中,即EGP协议。目前使用最多的BGP为版本4,即BGP-4。 BGP(Border Gateway Protocol)是用于AS间的动态路由协议,交换AS间的可达路由信息,防止路由环路。 BGP属于外部网关协议EGP,与IGP不同,其目的不在于发现和计算路由,而在于在AS之间选择最佳路由和控制路由的传播。 BGP使用TCP作为传输协议,提高协议可靠性。当路由更新时,BGP只发送更新的路由,减少占用带的宽。

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