350-501 · Question #130
Refer to the exhibit. An engineer is implementing Auto-RP and reviewing the configuration of the PE-A. Which configuration permits Auto-RP messages to be forwarded over this interface?
The correct answer is D. PE-A(config-if)#ip pim sparse-dense-mode. To permit Auto-RP messages to be forwarded over an interface, it must be configured for PIM sparse-dense-mode.
Question
Refer to the exhibit. An engineer is implementing Auto-RP and reviewing the configuration of the PE-A. Which configuration permits Auto-RP messages to be forwarded over this interface?
Exhibit
Options
- APE-A(config-if)#ip pim sparse-mode
- BPE-A(config-if)#no ip pim bsr-border
- CPE-A(config-if)#ip igmp version 3
- DPE-A(config-if)#ip pim sparse-dense-mode
How the community answered
(41 responses)- A7% (3)
- B2% (1)
- C15% (6)
- D76% (31)
Why each option
To permit Auto-RP messages to be forwarded over an interface, it must be configured for PIM sparse-dense-mode.
PIM sparse-mode interfaces, by default, do not forward dense mode multicast traffic like Auto-RP messages without explicit configuration or joins.
The `no ip pim bsr-border` command is related to the PIM Bootstrap Router (BSR) mechanism for dynamic RP discovery, not Auto-RP, and does not directly enable Auto-RP message forwarding.
The `ip igmp version 3` command configures the Internet Group Management Protocol version, which is used by hosts to report multicast group membership, but it does not control PIM forwarding behavior for router-to-router multicast messages like Auto-RP.
Concept tested: Auto-RP message forwarding and PIM modes
Source: https://www.cisco.com/c/en/us/td/docs/ios/solutions_continuity/mcst_rtg/pim_rp/pim_rp_design.html
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