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

Question

Options

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

• A
  10% (5)
• B
  2% (1)
• C
  83% (43)
• D
  6% (3)

Explanation

In a multicast VPN (MVPN), Multicast Distribution Trees (MDTs) are used to transport multicast traffic between PE routers. The default MDT is always active and is used for control traffic and low-bandwidth multicast traffic. When multicast traffic exceeds a certain bandwidth threshold, the sending PE router creates a data MDT for that specific multicast stream. It then sends a UDP message to notify other PE routers of the new data MDT using the default MDT. This optimizes multicast traffic flow by using dedicated data MDTs for high-bandwidth traffic, reducing unnecessary load on the default MDT.

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