An SP core is running PIM on the network. Multicast groups in this networkare in the 232.0.0.0/8 range. Which commandenables multicast routing operations without using an RP?

The correct answer is B. ip pim ssm default. The 232.0.0.0/8 address range is the IANA-reserved range for Source-Specific Multicast (SSM). SSM is a PIM mode where receivers explicitly specify both the multicast group AND the source address (S, G), eliminating the need for a Rendezvous Point (RP). The command ip pim ssm defa

Multicast Routing

Question

Options

Aip pim autorp
Bip pim ssm default
Cip pim bidir-enable
Dip pim register-source

How the community answered

(35 responses)

A
6% (2)
B
91% (32)
D
3% (1)

Explanation

The 232.0.0.0/8 address range is the IANA-reserved range for Source-Specific Multicast (SSM). SSM is a PIM mode where receivers explicitly specify both the multicast group AND the source address (S, G), eliminating the need for a Rendezvous Point (RP). The command ip pim ssm default enables SSM for the default SSM range (232.0.0.0/8), allowing multicast routing to operate without any RP configuration. Choice A (autorp) enables Cisco's Auto-RP mechanism, which is used for Any-Source Multicast (ASM) and requires an RP. Choice C (bidir-enable) enables Bidirectional PIM, which still uses an RP for a shared tree. Choice D (register-source) sets the source IP address used in PIM Register messages sent to the RP, which is also an ASM/RP concept. Only SSM operates without an RP.

Topics

#Multicast Routing#PIM#Source Specific Multicast (SSM)#Rendezvous Point (RP)

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