Why do packet loops occur during the configuration of BlDlR-PIM?

The correct answer is B. The network is partially upgraded to support BIDlR-PIM. BIDIR-PIM (Bidirectional PIM) requires all routers in the multicast domain to support and run BIDIR-PIM for correct operation. Unlike PIM-SM, BIDIR-PIM uses a shared bidirectional tree rooted at a Rendezvous Point (RP), and traffic flows both toward and away from the RP. When…

Networking

Question

Options

AThe network does not support BIDIR-PIM
BThe network is partially upgraded to support BIDlR-PIM
CNo interface for carrying traffic for multicast groups has been configured
DThe router has not been configured to advertise itself

How the community answered

(23 responses)

A
4% (1)
B
87% (20)
D
9% (2)

Explanation

BIDIR-PIM (Bidirectional PIM) requires all routers in the multicast domain to support and run BIDIR-PIM for correct operation. Unlike PIM-SM, BIDIR-PIM uses a shared bidirectional tree rooted at a Rendezvous Point (RP), and traffic flows both toward and away from the RP. When only some routers in the network have been upgraded to BIDIR-PIM while others still run PIM-SM, the inconsistent multicast state handling between the two modes causes forwarding inconsistencies, leading to packet loops. Option A would cause failures, not loops. Option C (no interface configured) causes a reachability issue. Option D is not a recognized cause of looping in BIDIR-PIM.

Topics

#Multicast Routing#BIDIR-PIM#PIM Interoperability#Packet Looping

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