You are working as a Tier 3 NOC engineer at a large service provider. Supporting the core network is part of your job responsibility. An escalation has come to you after Tier 2 determines that a problem lies within the core of the network and is affecting every customer. You have analyzed the information in the trouble ticket, performed your own troubleshooting, and have determined that a BGP session is flapping between two core routers. Which two steps should you take before escalating to the router vendor? (Choose two.)
Verify that the routers are sending keepalives.
Determine if there is a Layer 2 or 3 transport problem.
Enable path MTU discovery.
Restart the BGP router process
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