Hello -
This may be a strange request for information, but I will do my best to explain our situation and what we are trying to accomplish.
We are a small company with nine locations. Each of these locations is connected to the other locations across a private MPLS WAN network. We use OSPF as the routing protocol to facilitate the connections.
The device making the OSPF connection and performing the routing varies.
Location 1 - A stacked pair of Nexus 9000 Layer 3 switches
Locations 2 and 3 - A stacked pair of Meraki MS350 Layer 3 switches
Locations 4 through 9 - A single Cisco ISR 4300 series
Locations 1-7 also have a dedicated internet connection. Locations 8 and 9 do not have a dedicated internet connection.
We have also invested in devices which are places at each branch to establish an SD-WAN connection across both the MPLS and local internet connection where one is available. These are EdgeConnect appliances from HPE Aruba.
The idea when we purchased the EdgeConnect devices was that the SD-WAN tunnels they build would give us redundancy for the branch connections should the router with the OSPF connection over the MPLS connection fail, or if there was an outage on one or more legs of the MPLS connection. Unfortunately, we have never been able to get this to actually work correctly.
At Location 1 and Locations 4-9, the EdgeConnect appliance is connected to the Cisco ISR over a BGP connection. As stated previously, the ISR is also configured in OSPF Area 0 to connect to the other locations. I have attached a crude diagram to hopefully show this clearly.
Due to the limitations of our Meraki L3 devices, this BGP connection cannot be made at Locations 2 and 3 - the Merakis don't support BGP.
The EdgeConnect appliances form tunnels between themselves using routes learned from both the BGP and OSPF connections. This is how we get the redundancy and survivability we want at Loc 1 + 4-9. But without the BGP we don't have that redundancy at Locs 2-3.
Is there some approach we can utilize on the Merakis at Locs 2-3 that will allow us to accomplish what we want?
I know this has to be confusing to follow. If I can provide more information to make more clear what we want to do, I am very happy to provide it.
Thanks,
Matt Brown // Revity Credit Union
