JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2023) — Question 32

There is a GRE tunnel configured over the Internet between Router-1 and Router-2. An OSPF adjacency is configured over this GRE tunnel. However, the OSPF adjacency briefly reaches the Full state before it is torn down. This cycle repeats indefinitely.
Which two actions would you perform to solve this problem? (Choose two.)

Answer options

• A. Configure OSPF to not export the tunnel endpoint interface routes.
• B. Configure the GRE interfaces on both routers as passive interfaces in OSPF.
• C. Configure the physical WAN interfaces on both routers as passive OSPF interfaces.
• D. Configure static routes to the tunnel endpoints.

Correct answer: A, D

Explanation

Configuring OSPF to not export the tunnel endpoint interface routes (Option A) prevents routing loops and unnecessary advertisements, which can stabilize the OSPF adjacency. Additionally, setting static routes to the tunnel endpoints (Option D) ensures that the routing information is correctly directed and can help maintain the OSPF relationship. Options B and C do not address the underlying issue of route advertisements causing instability.