Hello,

We have 2 sites separated by an MPLS cloud owned by our service provider.

One site is our core (Site A) and the other site is a remote site (Site B), no routing protocol, just static routes between them.

We have multiple Vlans on Site B: staff computers on Vlan 22, voip application on VLAN 33.

We have a VOIP application that requires multicast between our two sites. The VOIP application in on different Vlan 33 on Site B.

We are trying to setup sparse mode multicast with RP being Site A switch.

Our service provider is probably blocking multicast traffic (we didn't contact them yet), so we decided to build a GRE tunnel between the sites and route the multicast traffic over the tunnel.

We have issues with the multicast (sparse mode, bidirectional) over the tunnel.

We are trying to leave the staff VLAN 22 go over the physical interface towards the MPLS cloud back to our core, using the unicast routing table, while have the multicast traffic from VLAN 33 go over the GRE tunnel

Is this even possible?

Or we should have all of our VLANs go over the tunnel?

Thank you!