FRRouting Internet routing protocol suite FRRouting (FRR) is a Internet routing protocol suite implementing BGP, OSPF, RIP, IS-IS, PIM, LDP, BFD, Babel, PBR, OpenFabric, VRRP, EIGRP and NHRP. FRR's integration in Linux IP networking stacks makes it a general purpose routing stack for a wide variety of use cases including connecting hosts/VMs/containers to the network, advertising network services, LAN switching and routing, Internet access routers, and Internet peering.