350-501 Question #138: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An engineer is configuring an administrative domain in the given multi-vendor environment with PIM-SM. Which feature must the engineer implement so that devices will dynamically learn the RP?

Options

• AAuto-RP
• BBIDIR-PIM
• CSSM
• DBSR

Explanation

In a multi-vendor PIM-SM environment, the Bootstrap Router (BSR) is the standard feature for dynamically learning the Rendezvous Point (RP).

Approach. The Bootstrap Router (BSR) protocol is an open-standard mechanism within PIM-SM that allows routers to dynamically discover and disseminate Rendezvous Point (RP) information throughout a multicast domain. BSR is specifically designed to function in heterogeneous, multi-vendor network environments, making it the appropriate choice for dynamic RP learning in such a setup.

Common mistakes.

• A. Auto-RP is a Cisco proprietary solution for dynamic RP discovery and is not compatible with multi-vendor environments.
• B. BIDIR-PIM (Bi-Directional PIM) is a specific PIM mode designed for efficient many-to-many multicast traffic, not a mechanism for dynamic RP discovery.
• C. SSM (Source-Specific Multicast) is a multicast model where receivers explicitly specify the source of traffic, thus eliminating the need for an RP, which is not what the question asks for (dynamic RP learning in PIM-SM).

Concept tested. PIM-SM dynamic RP discovery in multi-vendor environments

Reference. https://www.cisco.com/c/en/us/td/docs/ios/ipmulti/configuration/guide/imc_cg_roadmap/imc_pim_bsr_disc.html

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