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350-501 · Question #601

How do PE routers operate with the MDT in a multicast VPN?

The correct answer is A. When the sending PE router recognizes that multicast data has exceeded the bandwidth. PE routers in a multicast VPN dynamically create a Data Multicast Distribution Tree (MDT) when high-bandwidth customer multicast data exceeds a configured threshold, offloading it from the default MDT.

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Question

How do PE routers operate with the MDT in a multicast VPN?

Options

  • AWhen the sending PE router recognizes that multicast data has exceeded the bandwidth
  • BAfter the default MDT and BGP VPNv4 neighbor is configured, a different PE neighbor in the IPv6
  • CWhen the source PE router establishes adjacency using PIM SM mode in the default MDT, the
  • DThe default MDT uses PIM sparse mode and PIM establishes adjacency over the shortest path

How the community answered

(54 responses)
  • A
    81% (44)
  • B
    6% (3)
  • C
    11% (6)
  • D
    2% (1)

Why each option

PE routers in a multicast VPN dynamically create a Data Multicast Distribution Tree (MDT) when high-bandwidth customer multicast data exceeds a configured threshold, offloading it from the default MDT.

AWhen the sending PE router recognizes that multicast data has exceeded the bandwidthCorrect

The sending PE router monitors multicast traffic, and when the volume for a specific customer multicast group exceeds a pre-defined bandwidth threshold, it triggers the creation of a new, separate Data MDT for that traffic, optimizing core network resource utilization.

BAfter the default MDT and BGP VPNv4 neighbor is configured, a different PE neighbor in the IPv6

This statement is grammatically incomplete and technically vague, not accurately describing PE router operation with MDT beyond basic configuration prerequisites.

CWhen the source PE router establishes adjacency using PIM SM mode in the default MDT, the

This statement is incomplete and does not describe a functional operation of PE routers in relation to dynamic MDT management or traffic handling.

DThe default MDT uses PIM sparse mode and PIM establishes adjacency over the shortest path

While default MDT uses PIM-SM, this option describes general PIM behavior rather than specific PE router operational mechanisms for optimizing multicast traffic with MDTs.

Concept tested: MVPN Data MDT dynamic creation

Source: https://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/mvpn/7_0/mvpn.html

Topics

#Multicast VPN (MVPN)#Multicast Distribution Tree (MDT)#Data MDT#PE Router

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