PIM DM Lab another question
I have simulated the PIM DM lab (Multicast : vol 1 v4.1)
Everything seems to be working fine step by step :
> Configured PIM DM on all interfaces
> Generate multicast traffic from SW1 using rtr object
> All routers learn about this mroute and prune as there is no receiver of this group
> Add the command 'ip igmp join-group 18.104.22.168' on SW2
> I can then see the Graft message being generated and all the upstream routers
change thier respective statuses from pruned to forwarding and I can see the traffic
flowing from R6 towards SW2
Right !! this is what the task requires but the problem is that it only works for 3 minutes once
the igmp membership is configured on SW2 and after 3 mintues, R6 generates a prune message
which is relayed to all upstream routers and all the links are then pruned.
Is this expected behaviour ?
What I am suspecting is that, although we have IGMP membership command configured on SW1,
its not actually simulating a multicast host presence untill a real host joins the group. Only then,
IGMP on SW1 will continuously send IGMP membership messages to R6. Othwise, both
R6 and SW2 will assume that there is no host to receive the traffic.
Please confirm if my understanding is correct ?
If this is correct, then I am wondering what would happen in the real exam ? Will they accept
the solution in 'pruned' situation ?
Thanks in advance...