350-501 · Question #445
What is a feature of mVPN?
The correct answer is B. It provides the ability to support multicast over a Layer 3 VPN. Multicast VPN (mVPN) is a key feature that specifically enables the transparent transport of multicast traffic between customer sites that are connected via a Layer 3 VPN across a service provider's network.
Question
What is a feature of mVPN?
Options
- AIt requires unicast to be disabled on the multicast domain
- BIt provides the ability to support multicast over a Layer 3 VPN
- CIt establishes multiple static MDTs for each multicast domain
- DIt requires the no ip mroute-cache command to be configured on the loopback interface of each
How the community answered
(24 responses)- A4% (1)
- B92% (22)
- D4% (1)
Why each option
Multicast VPN (mVPN) is a key feature that specifically enables the transparent transport of multicast traffic between customer sites that are connected via a Layer 3 VPN across a service provider's network.
mVPN relies on the underlying unicast routing capabilities of the Layer 3 VPN to establish and maintain the multicast distribution trees and transport multicast traffic; unicast is not disabled.
mVPN (Multicast VPN) is explicitly designed to extend a customer's multicast domain across a service provider's MPLS Layer 3 VPN infrastructure, allowing multicast traffic to flow between remote customer sites.
While mVPN utilizes Multicast Distribution Trees (MDTs), it typically establishes a default MDT and can dynamically create data MDTs based on traffic load, rather than requiring multiple static MDTs for each domain.
The `no ip mroute-cache` command is generally not a requirement for mVPN; it's an optional command sometimes used for specific multicast forwarding behavior or troubleshooting, usually on data interfaces.
Concept tested: Multicast VPN (mVPN) purpose
Source: https://www.cisco.com/c/en/us/td/docs/ios/ios_xe/multicast/configuration/guide/mc_xe_cfg_book/mc_vpn.html
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