I am new to multicast and have a question regarding receiving the multicast. what is the easiest way to figure out if the data is being sent by the source or not. Any tips will be a big help.
To troubleshoot multicast, I have found the "show ip mroute count" command is a good place to start.
When you do this command, you will see the multicast groups, and statistics for the source address - which you mention you want to check.
Looking at the line beginning with "Source", you can see the forwarding statistics for the group. They are separated by "/" and are as follows:
Sent Packet Count/Packets sent per second/Avg Pkt Size/Kilobits per second
An example is below:
show ip mroute count
IP Multicast Statistics
2 routes using 1714 bytes of memory
1 group, 0.50 average sources per group
Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)
Group: 22.214.171.124, Source count: 1, Packets forwarded: 4, Packets received: 4
Source: 10.1.1.4/32, Forwarding: 4/1/100/0, Other: 4/0/0