Ospf Protocol Configuration experiment Summary

The ospf Protocol Configuration experiment summary project is required. In the past two days, an environment is set up on GNS3, And the ospf cost value configured on the corresponding interface is 1000, however, some problems are found and the conclusions obtained through experiments are summarized as follows (please correct me !) :


Figure 1 Figure 2 1 when calculating the shortest path, if the cost values of the two paths are the same, select the link propagation with a large ip address of the source interface. When calculating the shortest path, if the cost values of the two paths are the same, select link propagation with a large ip address of the source interface; www.2cto.com 1. calculate the shortest path from R1 to R4. The cost and cost are the same on the two paths. Then, I learned from the experiment that R1 will select the e1/0 port with a large IP address to send packets, select the R1--R2--R4 path. 2. For shortest path calculation, the cost value of int2 is calculated once from the packet sent from one interface int1 on the vro to another interface int2. (Note: In Figure 2, the multicast protocol is also configured. You can ignore the previous SPT path and only check the RPT part.) You may question whether the image is incorrectly painted, because the R7 to RP Router does not seem to be the shortest path. It seems that there is still a shorter path (Blue Line logo), which is also my previous confusion. After repeated experiments, it turns out that if the path is blue, therefore, the total cost of R7 to RP is the sum of the cost values of the four links, not the three. Therefore, I come to the conclusion that the shortest path takes the network segment as the destination, not the device. See figure 2. Author LilyEnjoyingLife