Hi guys!! Sorry to seek your assistance yet again, but it is a the
first time I have played with mpls VPN multicast and havin some
problems.
I done the lab, and got everything up and running easy enough. In VPNA
I could ping the multicast group from ce, across the mpls l3 VPN core
to the multicast subcriber ce. Likewise VPNB.
Quite happy with myself at this point. Mdt and tunnels up and working
fine.
I review the the DSG, and I have done everything correct, except I
didn't configure an mdt address family in bgp! It still seems to work
fine.
I have done some reading to try and understand why it's needed, and
why mines working. Buy I'm not clear...
I understand that no RP is needed in SSM as there are no shared trees.
I now understand that mbgp mdt address family is needed so that each
pe can be told what sources it needs to register to. (is that right?)
I'm guessing in my scenario it doesn't actually need the mdt because
it knows about the remote pe's as it is configured in vpnv4 family (?).
If we had a non configured remote pe, such as via route reflectors it
wouldn't know to subscribe, without the mdt family.
Is this right?
I have been searching for the answer but not managed to find. Now
watching vlecture on mpls multicast, but unfurtunetly they voted for
any source multicast, so don't think it will be confirmed here :(
Appreciate any clarity!
Sent from my iPhone
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