Alcatel-Lucent NRS II – Multicast Routing — Question 10

In an MVPN that uses BGP Auto Discovery for both I-PMSI and S-PMSI, what action is taken by the ingress when customer multicast traffic drops below the threshold?

Answer options

• A. The ingress PE sends a MP_REACH_NLRI message to activate the Intra-AS I-PMSI A-D route.
• B. The ingress PE sends a MPJJNREACH_NLRI message to withdraw the S-PMSI A-D route.
• C. The ingress PE stops sending the S-PMSI A-D route.
• D. The ingress PE stops sending the Source Active A-D route.

Correct answer: B

Explanation

The correct answer is B because when multicast traffic drops below the threshold, the ingress PE needs to withdraw the S-PMSI A-D route to prevent unnecessary resource usage. Options A, C, and D are incorrect as they describe actions that do not align with the behavior expected when traffic falls below the threshold.