Comprehensive experiment of MPLS and BGP

The first step is to divide the network segment and configure ip unchanged, as shown below

We can configure the first loopback first. After the configuration, we can establish BGP neighbors between AR1 and AR2,5, and AR7 and AR8 neighbors

Take AR8 as an example (the rest of the logs are too many to be rejected)

Write MPLS on AR3, 4, and 6 according to the subject's requirements after BGP neighbor establishment

Take AR3 as an example

Take AR4 as an example

Then announce all network segments in the entire AS2 area to allow them to communicate with each other

Then add a second loopback interface to all routers on AS2. After that, you only need to announce it on the router with BGP written.

Take AR5 as an example (don't forget AR1,8)

When I got here, I found that my AR1 could not ping AR8, so I checked and found that it is because all BGPs in the AS2 area need to establish neighbors, that is to say, AR7 needs to establish neighbors with AR2 and 5. I hope everyone pays attention.

After the ping, most of the previous parts were basically completed, and then I came to AR1 to check the routes. There were no routes for AR3, 6, and 7 in the routing table. Because they were removed by the log, I did not take screenshots, and then I checked one by one., found that the second loopback of AR3,4 needs to be announced on AR2, and the loopback of AR6 needs to be announced on AR5, so that the routes in AR2,5 will be complete

Take AR2 as an example

Now the routing table in AR1 is complete

At this time, AR1 is complete, and there is no MPLS route before

Then there is the problem of route selection. From the table, only 172.16.2.0/24 of AR2 does not meet the route selection. The question requires him to go from below, so we use the method of grabbing and calling to change the cost.The smaller the better, we can change the cost of 172.16.16.1 from AR1 to AR2 to 10

As shown below

Let's look at the AR2 routing of the changed cost

Has it become the priority to go down, and then our entire experiment is exactly in line with the requirements of the topic, and the experiment is over