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+TROUBLESHOOTING
+
+# Check kernel mcast cache
+# On Linux:
+ip mroute show
+
+! qpimd on last-hop router
+! . attached to mcast receiver
+! . runnning both PIM-SSM and IGMPv3
+!
+show ip mroute (kernel mcast programming is correct?)
+show ip pim upstream (we joined our upstream?)
+show ip pim neighbor (upstream is neighbor?)
+show ip pim interface (pim enabled on interfaces?)
+show ip multicast (multicast enabled at all?)
+show ip rib SRC (unicast route towards source?)
+
+show ip igmp sources (receiver joined on interface?)
+show ip igmp interface (igmp enabled on receiver interface?)
+
+! qpimd on intermmediate routers
+! . may be attached to mcast source
+! . runnning only PIM-SSM, not IGMPv3
+!
+show ip mroute (kernel mcast programming is correct?)
+show ip pim upstream (we joined our upstream?)
+show ip pim join (downstream joined us?)
+show ip pim neighbor (downstream is neighbor?)
+show ip pim interface (pim enabled on interfaces?)
+show ip multicast (multicast enabled at all?)
+show ip rib SRC (unicast route towards source?)
+
+--EOF--