LAB scenario. Assistance needed.

Hello networkers,

I am trying to learn some BGP/Multicasting/MP-BGP etc, and I have built a lab, as shown in the image below.

https://ibb.co/jyNdcyf

Lab setup:

-2 VMware linux VMs.

-6 Cisco 3725 GNS3 routers.

-OSPF as an IGP

-Router 4 is the Route Reflector for BGP.

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The route reflector seems to be working fine, however I am having issues passing routes between the 2 VMs. Those 2 virtual machines are in their own VRF (VM1 is in R1 and VM2 is in R6), and I cannot understand as of how to configure multiple VRFs being passed through.

I have pasted the config below:

R1 config: https://pastebin.com/mDbD0Rr7

R2 config: https://pastebin.com/RRH8nfqS

R3 config: https://pastebin.com/nm2GWVHB

R4 config: https://pastebin.com/FabaZmnX

R5 config: https://pastebin.com/tPkcLDWk

R6 config: https://pastebin.com/FAdrNRQS

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I am sure the RR does not need to know all the VRFs within the MPLS domain, am I right?