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USTAT modules do not support dynamic routing protocols, so static routes will be used. On each edge router, you need to create static routes to each of the CNA tunnels configured on that router.
In global config mode on the edge router ER1, enter the following Cisco IOS commands:
ip route 172.25.5.1 255.255.255.255 Tunnel1 ip route 172.25.5.2 255.255.255.255 Tunnel2
On the edge router ER2, enter the following Cisco IOS command:
ip route 172.25.5.3 255.255.255.255 Tunnel3
The addresses are the VIPs assigned to each USTAT. Tunnel1 and Tunnel2 coexist on one edge router; Tunnel3 is alone on the other.
NOTE: In order to accommodate asymmetric routing--a situation where a packet destined for USTATa, which is configured for Tunnel1, arrives at router ER2, which is configured for Tunnel2--you will need to redistribute static routes into an interior routing protocol, or place additional static routes on each edge router.
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