Brief Introduction to Management Distance and Measurement in OSPF Routing Protocol

Many users may not understand the role of some parameters in the OSPF routing protocol. First, let everyone know the management distance in the OSPF routing protocol, and then give a comprehensive introduction to the measurement issues. If the router receives a route from OSPF and a route from RIP, it selects an OSPF route. Because the OSPF management interval is 110, and the RIP management interval is 120.

Here is another example: for example, if your vro receives a route from Internal, its management interval is 90, But you accidentally input a static route to an IP address, the Gap Management address of this IP address is 1. The vroeigrp uses a static route instead of an IPsec route. The last point is to emphasize that the management interval is the focus of the CCNA examination. If you are preparing to take this test, you must know the Management Distance of the general OSPF routing protocol.

Measure

The OSPF routing protocol uses metrics to determine which route table to be placed when two valid routes can be sent to the same target file. The router puts the route table in the route table with the smallest measurement, because it considers this route as the nearest and therefore the best. In contrast to the management distance, there is only one OSPF routing protocol. They cannot process routes in multiple resource pools. For example, enter the show ip:

Note that there are two routes transmitted to this network in this network. However, this router only accepts one of the routes with the shortest measurement in the routing table. Here is an example of a route table entry:

Different OSPF routing protocols have different algorithms for metrics. The RIP algorithm is based on the number of hops, and OSPF is based on the bandwidth. The OSPF algorithm is determined by the bandwidth, delay time, load, and reliability.