[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["很难理解","hardToUnderstand","thumb-down"],["信息或示例代码不正确","incorrectInformationOrSampleCode","thumb-down"],["没有我需要的信息/示例","missingTheInformationSamplesINeed","thumb-down"],["翻译问题","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC):2025-08-12。"],[],[],null,["# High availability requirements for spoke resources\n\nFor Network Connectivity Center to properly enable site-to-site data transfer, you must\nconfigure spoke resources in high availability configurations. If you don't,\nsites might be unable to pass traffic to one another.\n\nEach resource type has different requirements for high availability, as\ndescribed in the following sections.\n\nHigh availability for Cloud Interconnect\n----------------------------------------\n\nFor site-to-site data transfer to work correctly with\nCloud Interconnect resources, you must configure multiple Interconnect\nconnections, each in a separate edge availability domain.\n\nFor detailed information about how to configure Cloud Interconnect\nresources for high availability, see the following documentation:\n\n- [Redundancy and SLA for\n Dedicated Interconnect](/network-connectivity/docs/interconnect/concepts/dedicated-overview#redundancy)\n- [Establishing 99.99% availability for\n Dedicated Interconnect](/network-connectivity/docs/interconnect/tutorials/dedicated-creating-9999-availability)\n- [Redundancy and SLA for\n Partner Interconnect](/network-connectivity/docs/interconnect/concepts/partner-overview#redundancy)\n- [Establishing 99.99% availability for\n Partner Interconnect](/network-connectivity/docs/interconnect/tutorials/partner-creating-9999-availability)\n- [Creating redundant Interconnect connections with sufficient\n capacity](/network-connectivity/docs/interconnect/concepts/best-practices#capacity)\n\nHigh availability for Cloud VPN\n-------------------------------\n\nFor site-to-site data transfer to work correctly with Cloud VPN\nresources, you must configure multiple HA VPN gateway interfaces\nand tunnels to achieve a 99.99% SLO. For guidance, see the\n[Cloud VPN overview](/network-connectivity/docs/vpn/concepts/overview#ha-vpn).\n\nHigh availability for Router appliance\n--------------------------------------\n\nFor site-to-site data transfer to work correctly with router appliance instances\nattached to a spoke, you must do the following:\n\nIf you place all your router appliance instances in a single spoke,\nuse equal-cost multipath (ECMP) to advertise the same set of prefixes from\ntwo router appliance instances. To advertise different prefixes for each\nspoke, add each router appliance instance to a different spoke.\n\nYou can't create a cross-region configuration in a single spoke.\n\nECMP is the result of advertising the same prefix or prefixes, with\nthe same MEDs and AS path as applicable, from two or more\nrouter appliance instances. The guidance about\n[route selection in VPC networks](/vpc/docs/routes#routeselection)\napplies to router appliance instances as it does to other\nGoogle Cloud resources.\n\nFor detailed information about how to configure router appliance instances\nfor high availability, see\n[requirements for 99.9% availability](/network-connectivity/docs/network-connectivity-center/concepts/ra-overview#ra-availability).\n\nWhat's next\n-----------\n\n- To view a sample topology, see [Sample topology for site-to-site data transfer](/network-connectivity/docs/network-connectivity-center/concepts/data-transfer-topology).\n- To learn more about how Network Connectivity Center enables full mesh connectivity, see [Route exchange with site-to-site data transfer](/network-connectivity/docs/network-connectivity-center/concepts/route-exchange).\n- To work through a tutorial, see [Connecting two sites by using Cloud VPN spokes](/network-connectivity/docs/network-connectivity-center/tutorials/connecting-two-offices-with-vpns).\n- To create hubs and spokes, see [Working with hubs and spokes](/network-connectivity/docs/network-connectivity-center/how-to/working-with-hubs-spokes).\n- To view a list of partners whose solutions are integrated with Network Connectivity Center, see [Network Connectivity Center partners](/network-connectivity/docs/network-connectivity-center/partners)."]]