Principles of the RIP

Routing Information Protocol (RIP) is based on distance vector algorithms. It exchanges routing information through User Datagram Protocol (UDP) packets and uses port 520.
RIP uses hop count to measure the distance to the destination address, and this hop count is called metric value. By default, the number of hops from a device to the connected network is 0, that of hops from the device to a network through another device is 1, and the rest may be deduced by analogy. This means that a metric value is equal to the number of devices through which a device can reach the destination network from its local network. To restrict the convergence time, RIP requires that the metric value be an integer between 0 and 15. A metric value greater than or equal to 16 is defined as infinite, which means the destination network or host is unreachable. Due to this restriction, RIP cannot be applied to large-scale networks.
RIP supports the split horizon and poison reverse functions to improve the performance and prevent routing loops.
For more information, visit Huawei technical support website.

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