As per the diagram, we have two server access switches attached to each other with a port channel and attached to distribution switches.
Sdi02 has been configured to act as the DR and man02 has been configured to be the RP for the multicast group. Both SAC switches are configured to have VLAN19 and 18.
Problem I'm having is when I server 10.3.19.54 send multicast traffic to x.x.x.1 group only other servers in VLAN19 can see it. However the same server can talk and listen to multicast group x.x.x.2 without any issues. Also Server 10.3.18.185 doesn't have any problem with the group x.x.x.1 and there are other servers in the group without any issues.
When I do show ip mroute on SDI01, I can see server 10.3.19.54 however it's not appearing on SDI02 which is supposed to be the DR.
If I do âshow ip igmp group x.x.x.1â I can see the server 10.3.19.54 on both SDI01 and SDI02. Also I can see the port connecting 10.3.19.54 registering to the multicast group on âshow cam staticâ on the server access switche SAC09 and all port channels on both switches.
Problem is 10.3.19.54 is not registering on the RP and it's not going anywhere afer SDI01. As per the config theory it should take the port channel connecting SAC09 and SAC10 and then hit SDI02 and then talk to the RP.
After doing may troubleshooting, clearing mroute, clearing static cam, clearing igmp group, nothing works.
I've changed the server IP and still no luck (server IP was changed to ruled out any port issues on the port channel - once I changed the IP channel hash took a different port).
I've plugged a laptop on to the same SAC switch and used âUDPSENDâ to subscribe to the same multicast group and VLAN also I used the server OLD IP address as well, however the laptop didn't register on DR or RP but it registered on SDI01.
To fix the issue I had to put a static cam entries on both SAC switches and after that clear mroute on both SDI switches and it started working for the group x.x.x.1. All good.
UNTIL today we started having a similar issue on the multicast group x.x.x.3 with the same symptoms. So I'm wondering there is an underlined issue to this.
CAM aging is set to 1200 on the SAC switches and 300 on the SDI switches and port fast has been enabled on all SAC switch ports.
ANY LIGHT ON THIS ISSUE IS HIGHLY APPRICIATED.