I imagine this question has been posted a million times before but here goes. I am trying to image a number of machines via GhostCast server across a 3750X stack running multiple VLANS. I am running the IPBASE image so am aware that multicast functionality is limited however I was hoping someone could help me work around the issue.
I am running 12.2(55)SE3.
I have tried adding both VLAN's into an IGMP group using the "ip igmp join-group" command which shows both VLANs as part of the group but to no reall effect. To be honest though I am clutching at straws! I'm just starting to read through the documentation so hopefully that will help.
Alessio, if we are dealing with inter-VLAN multicast (i.e. the multicasts are originated in one VLAN and are supposed to be delivered into another VLAN) then using the 188.8.131.52 address will not help - apart from this IP address being purposefully defined with link local scope (i.e. not allowed to address any station on a different interface), no router will carry any multicast packet from one interface to another without multicast routing support.
I shall have a look into the docs as well. However, without multicast routing support, the only feasible way of doing this is to perform directed broadcasting.
I think I've found a way round the issue using a stub IGMP type configuration.
On the router I set the following commands:
ip multicast-routing distributed ip pim rp-address 10.92.39.13 < -- address of ghostcast server
On each VLAN involved in ghosting ip pim passive ip igmp helper-address 10.92.39.13 <-- address of ghostcast server
Seems to do the job, a sh ip mroute shows the dynamically built IGMP groups in use (Normally different each time ghostcast server starts) and the client app finds the session name without any prompting.
Cheers all, Let me know if the above helps you at all.
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