The mroute table is empty of 226.0.0.1 group information
Debug multicast forwarding
We activate PIM on the fa0/0 interface (to enable multicast packets processing) and run a debug ip mfib pak
A debug on R1 shows the packet from the server fails the acceptance check. Is it due to sparse mode? Or in general? We put the interface into dense mode
the debug shows the output in the following figure. The flow is now accepted but fails because of no forwarding interface.
We configure back the interface into sparse mode
In addition, we configure R4 to be a RP (static) instead of R1.
Now the packet is accepted for forwarding
But because of no forwarding interface the packets are still dropped
We check also that R4 initiates the register process with the RP (which is R4 in our case)
At R4,
The mroute table is populated by (S,G) entry but it is pruned because of the outgoing interface list is empty
Let’s configure the RP on the other routers to match R4
At R1 as soon as we configure the RP address to match R4
We check that R1 build a join message for 226.0.0.1 and put it in R2 queue
