The main purpose of using TLOC (Transport LOCation) extensions in WAN Edge router configuration is:
C. creates hardware-level transport redundancy at the local site
Explanation:
TLOC extensions in Cisco SD-WAN are used to define additional transport interfaces on a WAN Edge router. These additional transport interfaces provide hardware-level transport redundancy at the local site. By configuring TLOC extensions, you can create redundant transport paths, allowing the WAN Edge router to switch to an alternate transport interface in case the primary one fails.
Redundancy at the transport level ensures high availability and fault tolerance for the SD-WAN overlay network. If one transport interface becomes unavailable, the SD-WAN traffic can automatically failover to the alternate transport interface, ensuring continuous connectivity and minimizing downtime.
The other options do not accurately represent the main purpose of TLOC extensions:
A. Transports control traffic to remote-site WAN Edge routers: This is not the primary purpose of TLOC extensions. TLOCs represent transport interfaces on a WAN Edge router and are used for data plane traffic handling.
B. Creates an IPsec tunnel from WAN Edge to vBond Orchestrator: TLOC extensions are not directly involved in creating IPsec tunnels to the vBond orchestrator. The vBond orchestrator plays a role in initial authentication and bootstrapping of WAN Edge routers but does not rely on TLOC extensions for IPsec tunnel creation.
D. Transports control traffic to a redundant vSmart Controller: While TLOC extensions are used for data plane transport, they are not specifically responsible for transporting control traffic to redundant vSmart controllers. Control plane connectivity to vSmart controllers is established independently using other mechanisms such as the OMP (Overlay Management Protocol).
Option [A]
TLOC Extensions allows a WAN edge router to communicate over the WAN transport (connected to the adjacent WAN Edge router) through a TLOC-extension interface
Cisco Guide:-
https://www.cisco.com/c/en/us/support/docs/routers/sd-wan/220333-configure-layer-3-tloc-extension.html#:~:text=The%20TLOC%20extension%20allows%20a,have%20redundancy%20on%20transport%20side.
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