Discover the optimal multicast routing protocol for building VXLAN flood-and-learn networks based on IETF RFC 7348. Learn why Bidirectional PIM (PIM Bidir) meets the requirements for efficient BUM and short BUM replication modes using shared trees.
Table of Contents
Question
An engineer must build a VXLAN flood-and-learn network. The customer requires the solution to be based on the IETF documented practice in RFC 7348. The solution must use broadcast, unknown unicast, and multicast (BUM) and include the efficient BUM and short BUM replication modes that use only shared trees.
Which technology meets these requirements?
A. MVPN
B. PIM sparse mode
C. PIM SSM
D. Bidirectional PIM
Answer
D. Bidirectional PIM
Explanation
Bidirectional PIM is a multicast routing protocol that builds shared bidirectional trees between Rendezvous Points (RPs) and receivers. It supports efficient BUM and short BUM replication modes, which use shared trees for replicating broadcast, unknown unicast, and multicast (BUM) traffic, as required by the VXLAN flood-and-learn network based on RFC 7348.
In a VXLAN flood-and-learn network, Bidirectional PIM (PIM Bidir) is used to replicate BUM traffic from the source VTEP (VXLAN Tunnel Endpoint) to the remote VTEPs. The source VTEP sends BUM traffic to the Rendezvous Point (RP), which then replicates the traffic onto the shared bidirectional tree, reaching all interested receivers (remote VTEPs).
PIM Bidir uses shared trees and supports efficient and short BUM replication modes, making it the most suitable option for the given requirements.
The other options are not correct:
A. MVPN (Multicast VPN) is a technology for enabling multicast across VPNs, but it does not directly address the requirements for a VXLAN flood-and-learn network.
B. PIM sparse mode builds source-based trees, which are not shared and do not meet the requirement for using shared trees and efficient BUM replication modes.
C. PIM SSM (Source-Specific Multicast) is a variation of PIM sparse mode that also builds source-based trees, which do not meet the requirements.
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