Colleagues,
There is a leaf router with 1 WAN and 1 LAN interface (a remote branch). Why do I see so many (S, G) mroutes? Just for example:
strj#sh ip mroute 224.0.1.3 summary
[dd](*, 224.0.1.3), 00:03:20/00:02:59, RP 10.14.129.71, OIF count: 1, flags: SJCF (10.14.128.61, 224.0.1.3), 00:02:32/00:00:27, OIF count: 1, flags: CJT (10.14.128.126, 224.0.1.3), 00:03:17/00:01:20, OIF count: 1, flags: CFT (10.14.128.190, 224.0.1.3), 00:02:37/00:00:22, OIF count: 1, flags: CJT (10.14.128.254, 224.0.1.3), 00:00:56/00:02:03, OIF count: 1, flags: CJT (10.14.134.5, 224.0.1.3), 00:02:41/00:00:18, OIF count: 1, flags: CJT (10.14.134.6, 224.0.1.3), 00:01:05/00:01:54, OIF count: 1, flags: CJT (10.14.134.30, 224.0.1.3), 00:00:52/00:02:07, OIF count: 1, flags: CJT (10.14.134.31, 224.0.1.3), 00:02:24/00:00:35, OIF count: 1, flags: CJT (10.14.134.38, 224.0.1.3), 00:02:20/00:00:39, OIF count: 1, flags: CJT (10.14.134.107, 224.0.1.3), 00:01:10/00:01:49, OIF count: 1, flags: CJT (10.14.134.125, 224.0.1.3), 00:02:25/00:00:34, OIF count: 1, flags: CJT strj#
My limited understanding of multicast routing says that (*, 224.0.1.3) should suffice. Maybe (10.14.128.126, 224.0.1.3) is necessary because there is a sender on the LAN interface. But why all the other source trees?
TIA for any input.