wido opened a new issue #3488: cloud0 subnet should not be hardcoded to 169.254.0.1/16 URL: https://github.com/apache/cloudstack/issues/3488 We are setting up a BGP+EVPN+VXLAN setup using Frr and BGP Unnumbered and this is causing some problems with the *cloud0* bridge created by the cloudstack agent. Although the global setting *control.cidr* can be modified, the KVM Agent will still create this bridge with a hardcoded subnet: **com/cloud/hypervisor/kvm/resource/BridgeVifDriver.java** <pre> if (!foundLinkLocalBr) { Script.runSimpleBashScript("ip address add 169.254.0.1/16 dev " + linkLocalBr + ";" + "ip route add " + NetUtils.getLinkLocalCIDR() + " dev " + linkLocalBr + " src " + NetUtils.getLinkLocalGateway()); } </pre> When using BGP Unnumbered it will try to create a route pointing to *169.254.0.1* This works until the CloudStack Agent is started: <pre> 10.255.255.1 via 169.254.0.1 dev enp81s0f1 proto bgp metric 20 onlink 10.255.255.2 via 169.254.0.1 dev enp81s0f1 proto bgp metric 20 onlink 10.255.255.3 via 169.254.0.1 dev enp81s0f1 proto bgp metric 20 onlink 10.255.255.4 via 169.254.0.1 dev enp81s0f1 proto bgp metric 20 onlink 10.255.255.6 via 169.254.0.1 dev enp81s0f1 proto bgp metric 20 onlink 10.255.255.7 via 169.254.0.1 dev enp81s0f1 proto bgp metric 20 onlink 10.255.255.8 via 169.254.0.1 dev enp81s0f1 proto bgp metric 20 onlink </pre> After the CloudStack Agent is started the 169.254.0.1/16 is added to cloud0 and not allowing Frr to create these routes: <pre> zebra[5010]: 0:10.255.255.8/32: Route install failed zebra[4562]: Extended Error: Nexthop has invalid gateway </pre> The solution would be that through *agent.properties* this CIDR can be controlled and isn't hardcoded.
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