I am trying to understand what I do not understand, bare with me, i lack some basics i assume and i need to understand what exactly do i lack. We have a Hub to Spoke topology. In the HUB we have configured on our Routed MX OSPF towards LAN. We also have static routes configured and enabled in VPN for all private ip addresses(all rfc1918). The Next Hop ip for the static routes is the LAN VIP of 2 NEXUS L3 switches. We also have configured the Single Lan subnet with/using the Router ID for the MX, so he can be identified by other OSPF peers. The limitation on Meraki says that "The MX will only advertise Meraki Auto VPN routes. The MX does not learn routes advertised by any OSPF neighbors". Not 100% sure what this means, so lets break it down: 1.Spoke A is sending a packet with a private ip of 192.168.1.2 which arrives at the HUB. 2.MX is configured with OSPF and the static routes that i was describing above. 3.The MX learns the subnet and now it must route the packet towards LAN. a)So, what is actually happening here? If it was purely OSPF configured without the static routes, the packet would drop because OSPF doesn't provide a next hop because the MX cannot learn any OSPF routes from neighbors, therefore it doesn't have e next hop ip address towards the HUB LAN learned by OSPF. Correct me? please please please correct me if my judgement is wrong. b)So, what is actually happening here? We add the static routes configured towards the HUB LAN as described above. Now, the MX has a next hop ip address learned in the routing table thanks to the static routes so it knows how to reach the HUB LAN, so it must route/send the packet to the HUB LAN. - Now, because the MX knows the next hop, it sends the packet through OSPF towards the VIP of the 2 NEXUS? or it sends the packet through the static routes to reach the HUB LAN? - this is where i get confused, i really do not understand how the packet arrives at the HUB LAN. What is the actual path of the packet? what would be the traffic flow? OSPF path or Static routes Path? sorry if this is silly for you - Also from LAN to HUB MX to AutoVPN, i need to understand the path backwards. These are my notes: The MX will advertise Meraki Auto VPN routes from Spokes to LAN. The MX cannot learn routes advertised by any OSPF neighbors, so in other words, it cannot learn the next hop LAN through OSPF to send the subnets towards the NEXUS LAN. WHY? MX must know where to send these routes, it must have a next hop as a default gateway towards LAN. With ospf being configured, it is not enough because the MX still doesn't know the path towards LAN even if it has OSPF configured(ospf cannot provide the next hop!!), reason why static routes define the next hop path to reach the LAN network. Now, because the MX learns how to get to the next hop through static routes, it can send the private subnets through ospf??? what?
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