Further clarification: I've set next-hop-self on the iBGP peers, and intend to have a full mesh between the routers. However I tested it before the full mesh was complete. Here is a rough idea of what I've got: MT Router -- (ospf) -- 2x L3 switches -- (ospf) -- MT router MT routers advertise a loopback into OSPF and I am able to ping between MT routers. iBGP can establish and learn an abundance of routes - next-hop-self and update-source configured Route tables update and show the learned routes as valid with recursive next-hop of the loopback of the far-end MT router Traceroute to a subnet behind the far-end MT router stops at the first switch with "destination network unreachable" or equivalent because the switch itself has no route for the final destination Are there any special settings required for the switches to process the recursive-next-hop address instead of the packets actual destination IP? -----Original Message----- From: Public <public-bounces@talk.mikrotik.com.au> On Behalf Of Philip Loenneker Sent: Friday, 23 October 2020 10:01 AM To: public@talk.mikrotik.com.au Subject: [MT-AU Public] iBGP over OSPF Hi all, I have multiple MikroTik routers connected to non-MikroTik switches with OSPFv2 and v3 enabled on routers and switches (isolated VRF) to distribute loopbacks and interconnect subnets. No other subnets are in the IGP. I can establish iBGP peers between loopbacks and exchange all routes (showing recursive next hop), including default route, but I can't connect to subnets behind other routers. In a traceroute the switches report that there is no valid next hop. This all seems logical, except that all the guides say to do it this way. I've seen some guides say to run MPLS over the top to get reachability, but I don't want to have that, especially since some routers are CHR and have issues with MPLS on some hypervisors. Does anyone have any advice on this? Do I need to have L2 as adjacency between all routers eg with a tunnel over the OSPF loopbacks, or MPLS, or should this work as the guides all suggest? I'm sure I'm missing something obvious... Regards, Philip _______________________________________________ Public mailing list Public@talk.mikrotik.com.au https://aus01.safelinks.protection.outlook.com/?url=http%3A%2F%2Ftalk.mikrot...