State refresh is used in PIM Dense mode.
By default cisco router will process state-refresh message and forward it. It won't originate the state-refresh message by default.
To enable originate state-refresh message, you need to enable it in the interface on the router that directly connect to the source. This way the router knows when the mroute will be timeout and stop generate the state-refresh message.
interface ser 1/0.25
ip pim state-refresh originate-interval [sec]
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