I have 3 ASR-1001-X routers. One router has two tunnels to each one of the other 2 routers. The other 2 routers only have one tunnel to the central router. Central router is on network 172.16, the other two routers are on networks 172.17, and 172.19. I can ping 172.19, and 17 from 16, I can ping 172.16 from 19 and 17, but I cannot ping 17 from 19 and vice versa. How can I tell router on network 172.16 that when 172.19 send a package to 172.17 to route it through the tunnel to 17, and back? Hope I am making sense.