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BGP routing reflector and the establishment of neighbors between large AS is how, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

The topology diagram is as follows (notice that R1 is in the middle, not from left to right):

Purpose: interworking between R2 and R4

Experimental environment: R1~R4 belongs to the large federation AS100 (also known as the grand federation), among which there are two small as; R5 belongs to the grand federation AS200

Under what circumstances does BGP use:

1. Use BGP between operators

2. When an enterprise has a multi-egress network design, BGP can be used.

3. When you want to flexibly control routing, you can use BGP

The steps of the experiment:

Configure IP address (it doesn't matter, impatient friends can skip it)

R1:

By the way, two loopback ports, one lo10 is used for testing, and the other lo0 is used to build neighbors [the reason for not using the local port is that the loopback port will not be down (try tapping a undo shutdown if you don't believe it), which is good for the stability of the bgp neighbors]

R2:

R3:

R4:

R5:

2. OSPF declares the IP address (the premise of establishing a neighbor is that the route is reachable)

R1:

R2:

R3:

R4:

R5:

Configure the neighbor relationship between as64512 and as64513 within AS100

R1:

R2:

R3:

R4:

4. Set up a route reflector to make R2 and R4 interwork

Because R2 is not connected to R4ping, it is necessary to set up a route reflector

The meaning of this command is to use R2 as the client of R1, so R1 becomes a reflector

Establishing the neighbor relationship between AS100 and AS200

R4:

R5:

Verification results:

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