Hello Nani
Great to have you here! We’re happy that you find the forum and Rene’s lessons helpful in your studies!
In the output of the show ip mroute command, you will see various multicast address groups that exist within the mroute table. For each of these, there is a single incoming interface. All multicast traffic that a router will route will only come from a single interface. If any packets from that particular multicast group arrive on another interface, they will be discarded. If there is currently multicast traffic being routed, the incoming interface will be populated. If not, it will be Null.
The outgoing interface list shows the list of interfaces from which multicast traffic will be sent. These interfaces depend on the hosts that have registered to that particular multicast group. If they are currently sending multicast traffic, you will see two times separated by a slash. The first is how long the entry has been in the IP multicast routing table, and the second is when the entry will be removed from the IP multicast routing table. If there is no traffic, you will see “stopped” after the slash.
More information about this output can be found here:
https://www.cisco.com/c/en/us/td/docs/ios/12_2/switch/command/reference/fswtch_r/xrfscmd6.html
Concerning the specific implementation on the GNS3 lab, we’ll need a little more information to determine the specific problem. However you can check your IOS version against that in the following documentation for that specific command:
The default J/P holdtime is indeed 210 seconds while the default PIM hello packet holdtime is 105, so this is correct.
Yes you are correct. This should be 239.3.3.3. I will let Rene know. Thank you!
I hope this has been helpful!
Laz