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352-001 · Question #653

Refer to the exhibit. Which two features can be used to make multicast work in this situation? (Choose two.)

The correct answer is C. Enable the IGMP querier feature on LAN switch A D. Configure a static MAC entry for the multicast server. Without a multicast router acting as an IGMP querier, enabling the querier on a switch and adding a static MAC entry for the multicast server restores proper Layer 2 multicast forwarding.

Designing Network Services

Question

Refer to the exhibit. Which two features can be used to make multicast work in this situation? (Choose two.)

Options

  • ADisable IGMP snooping on both switches
  • BDisable the IGMP query election process
  • CEnable the IGMP querier feature on LAN switch A
  • DConfigure a static MAC entry for the multicast server
  • EDisable PIM snooping on both switches

How the community answered

(62 responses)
  • A
    6% (4)
  • B
    13% (8)
  • C
    76% (47)
  • E
    5% (3)

Why each option

Without a multicast router acting as an IGMP querier, enabling the querier on a switch and adding a static MAC entry for the multicast server restores proper Layer 2 multicast forwarding.

ADisable IGMP snooping on both switches

Disabling IGMP snooping resolves the flooding problem by flooding multicast to all ports, but this wastes bandwidth and is not a targeted or best-practice solution for a missing querier.

BDisable the IGMP query election process

Disabling the IGMP query election process does not solve the underlying problem - it still leaves no querier present, so group membership cannot be maintained by IGMP snooping.

CEnable the IGMP querier feature on LAN switch ACorrect

Enabling the IGMP querier feature on LAN switch A allows the switch to originate IGMP General Query messages in the absence of a multicast router. This keeps IGMP snooping functional by prompting hosts to re-declare group membership, ensuring the switch correctly populates its forwarding table for multicast groups.

DConfigure a static MAC entry for the multicast serverCorrect

Configuring a static MAC entry for the multicast server group address guarantees that multicast frames are always forwarded to the server's port regardless of the IGMP snooping state, providing a reliable forwarding path even before dynamic group membership is established.

EDisable PIM snooping on both switches

Disabling PIM snooping is unrelated to the Layer 2 IGMP querier absence issue and would not affect IGMP-based group membership tracking on the switches.

Concept tested: IGMP querier and static MAC for Layer 2 multicast forwarding

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_igmp/configuration/xe-16/imc-igmp-xe-16-book/imc-igmp-snooping.html

Topics

#IGMP snooping#IGMP querier#multicast#static MAC entry

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