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In order to assert routes from a CNA system to your network, each USTAT needs a dedicated link to an edge router. In the detailed configuration example in Chapter 2: Configuring Your Routers of the CNA Advanced Monitoring Guide, the links between USTATs and routers are GRE tunnels.
To add HA to the network in that chapter, you would simply add another CNA system to your network fabric and configure additional GRE tunnels on the edge routers to connect each router to a duplicate set of USTATs.
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