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350-601 · Question #88

When using Overlay Transport Virtualization (OTV), how do L2 multicast frames traverse the overlay?

The correct answer is C. The L2 multicast frames are encapsulated in an OTV packet using the configured data-group. OTV handles Layer 2 multicast frames by encapsulating them into OTV packets that utilize a configured data-group IP multicast address, allowing these frames to traverse the underlying IP transport network across the overlay.

Network

Question

When using Overlay Transport Virtualization (OTV), how do L2 multicast frames traverse the overlay?

Options

  • AThe L2 multicast frames are encapsulated in an OTV packet using the configured control-group
  • BThe L2 multicast frames are dropped because multicast cannot be carried across the overlay
  • CThe L2 multicast frames are encapsulated in an OTV packet using the configured data-group
  • DThe L2 multicast frames are forwarded natively across the overlay based on their multicast IDs

How the community answered

(53 responses)
  • A
    4% (2)
  • C
    94% (50)
  • D
    2% (1)

Why each option

OTV handles Layer 2 multicast frames by encapsulating them into OTV packets that utilize a configured data-group IP multicast address, allowing these frames to traverse the underlying IP transport network across the overlay.

AThe L2 multicast frames are encapsulated in an OTV packet using the configured control-group

The control-group multicast address in OTV is reserved for the OTV control plane, which carries IS-IS updates for MAC address reachability information, not for encapsulating Layer 2 data plane multicast frames.

BThe L2 multicast frames are dropped because multicast cannot be carried across the overlay

OTV is designed to extend Layer 2 domains, and this includes carrying Layer 2 multicast traffic effectively across the IP overlay, making the statement that they are dropped incorrect.

CThe L2 multicast frames are encapsulated in an OTV packet using the configured data-groupCorrect

When Layer 2 multicast frames need to traverse an OTV overlay, the OTV edge device encapsulates these frames into new IP multicast packets, using the specifically configured data-group IP multicast address for the overlay, which is then forwarded across the IP transport network.

DThe L2 multicast frames are forwarded natively across the overlay based on their multicast IDs

OTV operates by encapsulating Layer 2 frames into IP packets for transport over the IP network; it does not forward Layer 2 frames 'natively' across an IP-based overlay.

Concept tested: OTV Layer 2 multicast forwarding

Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/otv/config/c_OTV_ConfigGuide/OTV_Overview.html

Topics

#OTV#Multicast#Data Center Interconnect#Encapsulation

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