OSPF Over Speedfusion without sharing routes

Product Discussion
1

Hi everyone,

I’ve had an unusual request from a customer, so apologies in advance if this doesn’t make sense! They have Cisco kit setup and using OSPF for routing across their sites. They are starting to introduce Starlink to some sites where fibre isn’t available or as a backup WAN connection. With the lack of a truly static IP from SL, they are looking to use an SDWAN device to create a tunnel back to their DC (introduce Peplink!). With that, they ideally don’t want to share routing tables with the Peplink, they want all routing to stay with their Cisco kit and just use the SpeedFusion as a layer 2 link. Is that possible? Should we just push them to sharing routes with the peplink?

2

Hi Scott! No, sharing routes with the Peplink devices would not be needed. If a layer 2 SpeedFusion VPN is configured between the two Peplink devices, then any multicast messages sent by the Cisco devices connected to the LAN will forwarded over the SpeedFusion tunnel. Thus the two Cisco devices could form an OSPF adjacency with each other.

3

Thanks Aivaras! In this case, would we need to configure static routes on the Cisco devices to point to the Peplink? i.e. HQ Cisco has a static route pointing to the Peplink for any traffic destined for the remote site? Or is the OSPF adjacency enough?

4

Not if the Peplink’s are configured with layer2 SpeedFusion. To the CISCOs it would appear to be a bridge interface or a virtual ethernet cable joining their connected ports.