OSPF Network Point-to-Multipoint
Just to let you know,
As per one of the explanations:
R8 does not have an exact match for the prefix 22.214.171.124/24, which is the actual
subnet assignment of the DMVPN Network. Instead, it knows that there are five
endpoints on the network: 126.96.36.199, 188.8.131.52, 184.108.40.206, 220.127.116.11, and 18.104.22.168.
This is the normal and desirable behavior for OSPF network type point-to-multipoint,
according to the RFC standard.
On CSR 1000v IOS XE 3.11S the route is learnt on R8. This is a BUG (another one).
I tried this on my real rack and GNS3 and the /24 route of the DMVPN is not advertised at all by R5 to R8.
This is the 2nd weird thing I've seen on this IOS XE version, so I'm upgrading to 3.1202S in hope to see less of this. Anyways I'm doing the whole V5 WB again so I'll try to post as many bugs as I can whenever I found one.