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* KVM: add configurable MAC/IP script hook for static ARP/NDP and routes Introduces a new agent.properties option `vm.network.macip.static` (false by default) that makes BridgeVifDriver invoke on modifymacip.sh on every NIC plug (VM start) and unplug (VM stop). This is very useful in EVPN+VXLAN environments as it can reduce BUM traffic. By setting static ARP/NDP entries bridges can be configured using 'neigh_suppress on' as the ARP/NDP entries are already set statically by CloudStack. Setting 'neigh_suppress on' requires a manual change in the modifyvxlan.sh script as this is not the default behavior. * vxlan: In EVPN mode, disable ARP/NDP learning FRR populates the FDB via BGP EVPN, so kernel data-plane learning is redundant and counterproductive. Static ARP (IPv4) and NDP (IPv6) entries are added on startup of the Instance and remove on shutdown. FRR populates the FDB/neighbor table via control plane, and neigh_suppress tells the kernel bridge to use that information instead of flooding. This will vastly reduce BUM traffic with static ARP/NDP entries. |
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