Hello there.... looking to see if anyone could shine a light on what could be causing the problem that I am currently having with multicasting not working across two branch sites.
multicast routing enabled
igmp v2 enabled
multicast source = Branch1
multicasting at Branch1 works well for clients located at Branch1. multicast from Branch1 to clients at Branch2 does not work. Branches are connected via a Metro Ethernet PTP link through the provider. Provider confirms that multicast traffic is allowed and routable. Multicasting is enabled at Branch2's core router and PIM enabled in sparse mode on vlan interface where clients reside.
Performed a packet trace on a client located at Branch2. On the trace, I can see that the client does attempt to join the correct group, but never receives a response from the source. I notice the following:
The TTL on this IGMP packet is set to 1, which will be theoretically dropped before reaching the source as it is 4 hops away - is this my problem and is there any way to increase the TTL on an IGMP packet or how does one remedy this?
A ping test from a client located at Branch1 to the multicast source is successful. A ping test from a client located at Branch2 to the multicast source fails. A traceroute from the client located at Branch2 to the multicast source does not go beyond the first hop. Not sure I understand the reasonning for this failure.
If anyone could share a thought or two on what could be the problem, it would be greatly appreciated.