cisco 官方文档ip address unnumbered 简介



借用ip 地址这种功能，其最主要的目的就是节省宝贵的ip 地址资源。一个接口如果没有ip 地址就无法生成路由，也就无法转发报文。所谓“借用ip 地址”，其实质就是：一个接口上没有配置ip 地址，但是还想使用该接口。就向其它有ip 地址的接口借一个ip 地址过来，以使该接口能够正常使用。如果被借用接口有多个ip地址，则只能借用主ip 地址。如果被借用接口没有ip 地址，则借用接口的ip 地址为0.0.0.0。该功能通过ip address unnumbered 命令来实现-ip address unnumbered Profile



Borrow the ip address of this function, its main purpose is to save valuable resources of the ip address. If an interface ip address will not be able to generate routing, will not be able to forward packets. The so-called "ip address" to borrow, and its essence is this: an interface is not configured ip address, but would also like to use the interface. By an ip address over to the other interface ip address, so that the normal use of the interface. If you have multiple ip address interface borrowed, you can only borrow the main ip address. If the borrowed interface ip address, the borrowing interface ip address is 0.0.0.0. This function is the ip address unnumbered command to achieve