Hello, I am working on a assignment for one of my classes where I am tasked with building a network consisting of 4 AS' and BGP routing for communication throughout. We have been able to build the entire topology, but the subnet between R6 and R5 is unreachable, and thats when we found that R6 and R5 are not properly advertising their routes. We have ensured that we have a null0 route present in the routing table, and no funny settings have been enabled. We have also tried building the network with only routers R1, R6, and R5, and the issue persists. Attached below is the config for each relevant router.


Any help would be much appreciated!
UPDATE:
We figured it out, the network for R6 and R5 was /16 and not /8