Hello all, I maintain a network with 4 Bird 1.6 routers in it. The 4 routers are connected in a square like this: +-------+ +-------+ | | | | | dc1-1 +--------+ dc2-1 | | | | | +---+---+ +---+---+ | | | | | | +---+---+ +---+---+ | | | | | dc1-2 +--------+ dc2-2 | | | | | +-------+ +-------+ Each link participates in OSPF Area 0. Until last weekend all links were 1 gbit/sec, and all was fine and OSPF did it's thing. Last weekend we upgraded the top link (between dc1-1 and dcg2-1) to 10 gbit/sec, the other 3 links are still 1 gbit/sec. OSPF should take this increased bandwidth into account. But it can only do that if the reference bandwidth is configured correctly. To what is the reference bandwidth set in Bird 1.6 and how can I tweak this? I've checked https://bird.network.cz/?get_doc&v=16&f=bird-6.html#ss6.8 but I couldn't find which option defines the reference bandwidth. Or should I define a cost for each interface now manually, so it gives the 10 gbit/sec link a 10 times lower cost than the other 3? Kind regards, Cybertinus