I don't believe any of the intermediate devices need to participate in multicast because it is a GRE tunnel from one end to the other. I suspect that is what Sundar meant to say, just a typo.
If you want to allow multicasting on a 6500. There are a couple of things here. If all the computers are within the same vlan then you need to
1) turn on IGMP snooping
2) make the 6500 an "igmp querier". You need top do this because IGMP snooping listens for answers to queries but something has to make the query. Usually it is a router but some Catalyst switches can perform this function.
Alternatively you could just turn on pim under the relevant vlan interface on the 6500. "ip pim dense-mode". You still need IGMP snooping and you need to turn on "ip multicast-routing"
If the computers are on different vlans then do as above with pim on the vlan interface and ip multicast-routing turned on.
1) You only need IGMP snooping on switches and i guess most of the end to end network would be made up of routers. So if the entire end to end network is under your control yes you would need to enable multicast routing on all the intermediate routers. You would very probably look to use pim sparse-mode rather than pim dense-mode.
To be honest if you just want multicast between the 2 DMZ's Sundar's example is probably the way to go.
If you were doing the multicast on a vlan but not all interfaces: - that is what IGMP snooping is for. You can configure IGMP snooping globally on the switch or under the relevant layer 3 SVI but you don't configure it on individual switch ports. You don't need to.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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