什麼是路由反映程式?What is Route Reflector?

適用于: Azure Stack HCI、版本 20H2;Windows Server 2019Applies to: Azure Stack HCI, version 20H2; Windows Server 2019

邊界閘道協定 (BGP) 路由反映程式隨附于 遠端存取服務 (RAS) 閘道 ,並提供在路由器之間路由同步處理所需的 bgp 完整網狀拓撲的替代方案。Border Gateway Protocol (BGP) Route Reflector is included with Remote Access Service (RAS) Gateway and provides an alternative to BGP full mesh topology that is required for route synchronization between routers. 軟體定義網路部署中的路由反映程式是一種邏輯實體,位於 RAS 閘道和 網路控制站之間的控制平面上。A Route Reflector in a Software Defined Networking deployment is a logical entity that sits on the control plane between the RAS Gateways and the Network Controller. 不過,它不會參與資料平面路由。It does not, however, participate in data plane routing.

路由反映器的運作方式How Route Reflector works

透過完整的網狀同步處理,所有 BGP 路由器都必須與路由拓撲中的所有其他路由器連接。With full mesh synchronization, all BGP routers must connect with all other routers in the routing topology. 不過,當您使用路由反映時,路由反映程式是唯一與其他所有路由器(稱為 BGP 路由反映用戶端)連線的路由器,因此可簡化路由同步處理並減少網路流量。When you use Route Reflector, however, the Route Reflector is the only router that connects with all of the other routers, called BGP Route Reflector clients, thereby simplifying route synchronization and reducing network traffic. 路由反映會學習所有路由、計算最佳路由,以及將最佳路由轉散發至其 BGP 用戶端。The Route Reflector learns all routes, calculates best routes, and redistributes the best routes to its BGP clients.

您可以設定個別租使用者的遠端存取通道,以在 (VM) 的多部 RAS 閘道虛擬機器上終止。You can configure an individual tenant's remote access tunnels to terminate on more than one RAS Gateway virtual machine (VM). 這可在一個 RAS 閘道 VM 無法滿足租使用者連線的所有頻寬需求時,為雲端服務提供者 (Csp) 提供更大的彈性。This provides increased flexibility for Cloud Service Providers (CSPs) in situations where one RAS Gateway VM cannot meet all of the bandwidth requirements of the tenant connections.

不過,這項功能會介紹路由管理的額外複雜性,以及在租使用者遠端網站與其在雲端資料中心的虛擬資源之間的路由進行有效的同步處理。This capability, however, introduces the additional complexity of route management and effective synchronization of routes between the tenant remote sites and their virtual resources in the cloud datacenter. 提供連線到多個 RAS 閘道的租使用者也會在企業端的設定中帶來額外的複雜性,其中每個租使用者網站都會有個別的路由鄰居。Providing tenants with connections to multiple RAS Gateways also introduces additional complexity in configuration at the enterprise end, where each tenant site will have separate routing neighbors.

控制平面中的 BGP 路由反映器可解決這些問題,並讓 CSP 內部網狀架構部署對企業租使用者而言是透明的。A BGP Route Reflector in the control plane addresses these problems and makes the CSP internal fabric deployment transparent to the enterprise tenants.

  • 當您將新的租使用者新增至您的資料中心時,網路控制站會自動將第一個租使用者 RAS 閘道設定為路由反映程式。When you add a new tenant to your datacenter, Network Controller automatically configures the first tenant RAS Gateway as a Route Reflector.

  • 每個租使用者都有對應的路由反映程式,且位於與該租使用者相關聯的其中一個 RAS 閘道 Vm 上。Each tenant has a corresponding Route Reflector, and it resides on one of the RAS Gateway VMs that are associated with that tenant.

  • 租使用者路由反映程式會作為與租使用者相關聯之所有 RAS 閘道 Vm 的路由反映。A tenant Route Reflector acts as the Route Reflector for all of the RAS Gateway VMs that are associated with the tenant. RAS 閘道路由反映的租使用者閘道是路由反映器用戶端。Tenant gateways other than the RAS Gateway Route Reflector are the Route Reflector Clients. 路由反映程式會執行所有路由反映用戶端之間的路由同步處理,以進行實際的資料路徑路由。The Route Reflector performs route synchronization between all Route Reflector Clients so that the actual data path routing can occur.

  • 路由反映程式不提供其設定所在的 RAS 閘道服務。A Route Reflector does not provide services for the RAS Gateway upon which it is configured.

  • 路由反映程式會使用對應至租使用者企業網站的企業路由來更新網路控制站。A Route Reflector updates Network Controller with the enterprise routes that correspond to the tenant's enterprise sites. 這可讓網路控制站設定租使用者虛擬網路上所需的 Hyper-v 網路虛擬化原則,以進行端對端資料路徑存取。This allows Network Controller to configure the required Hyper-V Network Virtualization policies on the tenant virtual network for End-to-End Data Path access.

  • 如果您的企業客戶使用客戶位址空間中的 BGP 路由,RAS 閘道路由反映程式是唯一的外部 BGP (eBGP) 鄰近對應租使用者的所有網站。If your Enterprise customers use BGP Routing in the Customer Address space, the RAS Gateway Route Reflector is the only external BGP (eBGP) neighbor for all of the sites of the corresponding tenant. 無論企業租使用者的通道終止點為何,都是如此。This is true regardless of the Enterprise tenant's tunnel termination points. 換句話說,無論 CSP 資料中心的哪一個 RAS 閘道 VM 終止租使用者網站的站對站 VPN 通道,所有租使用者網站的 eBGP 對等都是路由反映。In other words, no matter which RAS Gateway VM in the CSP datacenter terminates the site-to-site VPN tunnel for a tenant site, the eBGP Peer for all the tenant sites is the Route Reflector.

後續步驟Next steps

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