basically, the mrouting table shows the IP addresses of the source router and the IP address of the multicast group. The 'incoming interface' is the interface through which traffic for the multicast group is received. The RPF is the IP address of the upstream router to the multicast address.
You might want to have a look at the link below, which describes all the fields in the output (scroll down to Table 42):
As with regard to your question about CCIE and multicast: it is definitely important that you fully understand multicast. Your best source is the documentation CD, which gives you in-depth details about the various multicast aspects:
wasn't able to download your attachment, but the output shows four separate sources sending to the group 220.127.116.11. Since you're configured for Sparse-Mode only, you'd only see these (s,g) entries if you were in the path between the sources and the RP. The timers tell you how long the multicast state has been known for each source - 172.16.2.1 and 172.16.3.1 are identical. I don't recall how ping responses are handled with multicast, but this could be other receivers on the group sending ping replies. this would make them each a source, requiring them to send register packets, etc. to the RP.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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