Discover how SD-WAN Edge routers originate vRoutes (virtual routes) from the TLOCs (Transport Location/Locators) connected to WAN transports, enabling secure data plane connectivity in the SD-WAN fabric.
Table of Contents
Question
What is one way an SD-WAN Edge router originates a vRoute?
A. learned from OSPF intra-area
B. learned from BGP
C. from TLOCs connected to the WAN transports
D. from the vBond controller
Answer
C. from TLOCs connected to the WAN transports
Explanation
In Cisco SD-WAN, an SD-WAN Edge router originates a vRoute (virtual route) from the TLOCs (Transport Location/Locators) connected to the WAN transports.
Each SD-WAN Edge router establishes one or more TLOCs, which represent the physical WAN interfaces or tunnels connected to various WAN transports, such as MPLS, Internet, or LTE. These TLOCs are associated with specific IP addresses and colors (VPNs).
When a TLOC is established and connected to a WAN transport, the SD-WAN Edge router originates a vRoute corresponding to that TLOC’s IP address and color. This vRoute information is then propagated throughout the SD-WAN fabric using the Overlay Management Protocol (OMP).
Other SD-WAN Edge routers in the fabric receive and install these vRoutes in their routing tables, allowing them to establish secure data plane tunnels (vPaths) between TLOCs for forwarding traffic across the overlay network.
The vBond controller and routing protocols like OSPF or BGP are not directly involved in originating vRoutes from TLOCs. The vBond controller’s primary role is to facilitate the initial exchange of control plane information and establish connectivity between SD-WAN Edge routers, while routing protocols like OSPF and BGP are used for dynamic routing within the overlay network, but not for originating vRoutes from TLOCs.
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