Question

A network engineer connects an on-premises Cisco IOS XE router to a Cisco IOS XE router hosted in Google Cloud using two IPsec VTI tunnels (Tunnel10 and Tunnel20) over separate ISP links. OSPF area 0 is enabled on both tunnel interfaces to exchange the on-premises 10.10.0.0/16 and cloud 10.200.0.0/16 prefixes. The business requires that all traffic use Tunnel10 as the primary path, with Tunnel20 used only if Tunnel10 fails. Both tunnels currently carry equal-cost routes and traffic is load-balancing across both. Which configuration change on the on-premises router achieves the requirement?

Accepted Answer

Set 'ip ospf cost 100' on Tunnel20 so its higher cost makes it a less-preferred backup path

Answer

Configure 'ip ospf priority 0' on Tunnel20 to prevent it from becoming the designated router

Answer

Apply 'ip ospf hello-interval 30' on Tunnel20 to slow its adjacency and deprioritize it

Answer

Enable 'ip ospf network broadcast' on Tunnel10 to give it a lower default cost