Which multicast address is reserved for cisco-rp-announce?
A.
224.0.331.37
B.
224.0.1.38
C.
224.0.1.39
D.
224.0.1.40
Explanation:
Auto-RP is a mechanism to automate distribution of RP information in a multicast network. The
Auto-RP mechanism operates using two basic components, the candidate RPs and the RP
mapping agents.
• Candidate RPs advertize their willingness to be an RP via “RP-announcement” messages.
These messages are periodically sent to a reserved well-known group 224.0.1.39 (CISCO-RPANNOUNCE).
• RP mapping agents join group 224.0.1.39 and map the RPs to the associated groups. The RP
mapping agents advertise the authoritative RP-mappings to another well-known group address
224.0.1.40 (CISCO-RP-DISCOVERY). All PIM routers join 224.0.1.40 and store the RP-mappings
in their private cache.