Refer to the exhibit. Which two commands must the engineer configure for the company’s PIM-SM network to enable Auto-RP mappings to be sent over the FastEthernet0/0 interface, without affecting normal operation? (Choose two.)
Refer to the exhibit. Which two commands must the engineer configure for the company’s PIM-SM network to enable Auto-RP mappings to be sent over the FastEthernet0/0 interface, without affecting normal operation? (Choose two.)
To enable Auto-RP mappings to be sent over the FastEthernet0/0 interface without affecting the normal operation of the network, you should configure 'enable auto-rp listener' and 'enable sparse-dense mode'. The 'enable auto-rp listener' command allows Auto-RP messages to be forwarded even if the interface is in sparse mode, which is necessary for ensuring the discovery of RP mappings in a PIM-SM network. The 'enable sparse-dense mode' command allows the network to operate in sparse mode for normal multicast traffic while using dense mode for Auto-RP messages, allowing these messages to be transmitted effectively.
In column Ver/Mode, the "S" stands for sparse mode. So why should pim sparse-mode be enabled again? A is ok. B imho is not correct
A or D are used to allow Cisco-RP-Announce and Cisco-RP-Discovery multicast messages to be flooded to all PIM enabled routers in the network (although D is not usually recommended).
ip pim autorp listener do not need to be set for sparse-dense mode. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16-5/imc-pim-xe-16-5-book/imc-basic-cfg.html#GUID-08C0EDBD-4A85-4FC3-AF2C-AA930C578F3C
Ip pim autorp listener = forwarding of the Auto-RP messaged Ip pim send-rp announce <interface> ... = sending rp-announce messages 224.0.1.39
Its AC, The ip pim autorp-listener allows the specific AutoRP traffic (destined to 224.0.1.39 and 224.0.1.40) to be flooded using dense mode rules across interfaces configured for strict sparse mode. This command has no meaning if using sparse-dense-mode - with this mode, the AutoRP traffic can always be flooded using dense mode rules.