BGP Peering Status for VPN Connection with TunnelState Metric Value 1

Correct Answer: A.

TunnelState metric can be used to determine the status of a VPN tunnel.

For VPN tunnels configured using BGP, the TunnelState metric will be 1 when the BGP state is an established state, and while for all other BGP states, it will be 0.

Options B, C and D are incorrect as for all states of BGP peering other than the Established state, TunnelState is 0.

For more information on monitoring VPN using AWS CloudWatch, refer to the following URL,

Sure, I can provide a detailed explanation for your question.

In AWS, when we create a VPN connection using the Border Gateway Protocol (BGP), Amazon CloudWatch provides several metrics that can help us monitor the status of the VPN connection. One of these metrics is the TunnelState metric.

The TunnelState metric indicates the status of the BGP peering for the VPN connection. The possible values for this metric are:

• 0: The BGP peering is in an Idle state.
• 1: The BGP peering is in an Active state.
• 2: The BGP peering is in an Established state.
• 3: The BGP peering is in a Deleting state.

Now, coming to your question, when the TunnelState metric value is indicated as 1, it means that the BGP peering for the VPN connection is in an Active state. This means that the BGP session has been initiated and the VPN gateway is attempting to establish a BGP peering with the customer gateway.

However, the BGP peering is not yet fully established. The VPN gateway is still waiting for the customer gateway to respond to the BGP session initiation. Once the customer gateway responds, the BGP peering will move to the Established state, and the TunnelState metric value will change to 2.

So, the correct answer to your question is option B: BGP peering is in an Active state.