Can you clarify what it is that you are requesting? Can you give us a little more information about the architecture you are trying to create and for what purpose?
Also keep in mind that if you have a suggestion for a lesson, you can always go to the Member Ideas page shown below, and make a suggestion for a particular lesson you’d like to see. You may find that others have made similar suggestions and you can add your voice to theirs.
In the meantime, take a look at this Cisco documentation that describes BGP route reflectors and how they can be incorporated into an ACI Fabric in a data center.
As with any BGP AS, all routers within an AS must be reachable in order for BGP to function correctly. Whether you use an RR or not, all routers within AS 123 must have routing established between them. This is typically achieved using an IGP like OSPF or EIGRP. So yes, an IGP should run in the AS to ensure reachability between all routers.
Notice how the next-hop wasn’t changed, it still refers to R1. What has changed was the addition of two new path attributes - Cluster List and Originator ID that Rene covers in his lesson.
The originator_ID is the router ID of the router from who the route originates from. It’s used as a loop prevention mechanism. If the router sees its own RID here, it will discard the packet.
Yes, route reflectors will only reflect routes. Configurations like update-source and next-hop-self are functions that operate within the confines of the router on which they are configured.
