>> В том то и дело что по mroute видно что 3400 не
>> знает об источнике, не могу понять почему.
> Хорошо, а как выглядит show ip mroute на 3750?Там все хорошо. 3750 знает о источниках.
(*, 226.100.10.218), 7w0d/stopped, RP 10.77.10.17, flags: SJC
Incoming interface: Vlan91, RPF nbr 192.168.29.1, Mroute
Outgoing interface list:
Vlan3049, Forward/Dense, 3d03h/stopped
Vlan5, Forward/Sparse-Dense, 19w0d/00:02:52
(10.251.251.8, 226.100.10.218), 1w0d/00:02:57, flags: JT
Incoming interface: Vlan91, RPF nbr 192.168.29.1
Outgoing interface list:
Vlan3049, Forward/Dense, 3d03h/stopped
Vlan5, Forward/Sparse-Dense, 1w0d/00:02:52
(*, 226.100.10.217), 7w0d/stopped, RP 10.77.10.17, flags: SJC
Incoming interface: Vlan91, RPF nbr 192.168.29.1, Mroute
Outgoing interface list:
Vlan3049, Forward/Dense, 3d03h/stopped
Vlan5, Forward/Sparse-Dense, 19w0d/00:02:53
(10.251.251.7, 226.100.10.217), 1w0d/00:02:57, flags: JT
Incoming interface: Vlan91, RPF nbr 192.168.29.1
Outgoing interface list:
Vlan3049, Forward/Dense, 3d03h/stopped
Vlan5, Forward/Sparse-Dense, 1w0d/00:02:53
(*, 226.100.10.211), 7w0d/stopped, RP 10.77.10.17, flags: SJC
Incoming interface: Vlan91, RPF nbr 192.168.29.1, Mroute
Outgoing interface list:
Vlan3049, Forward/Dense, 3d03h/stopped
Vlan5, Forward/Sparse-Dense, 19w0d/00:02:52
(10.251.251.8, 226.100.10.211), 1w0d/00:02:57, flags: JT
Incoming interface: Vlan91, RPF nbr 192.168.29.1
Outgoing interface list:
Vlan3049, Forward/Dense, 3d03h/stopped
Vlan5, Forward/Sparse-Dense, 1w0d/00:02:52
(*, 226.100.10.210), 7w0d/stopped, RP 10.77.10.17, flags: SJC
Incoming interface: Vlan91, RPF nbr 192.168.29.1, Mroute
Outgoing interface list:
Vlan3049, Forward/Dense, 3d03h/stopped
Vlan5, Forward/Sparse-Dense, 19w0d/00:02:54
(10.251.251.7, 226.100.10.210), 1w0d/00:02:57, flags: JT
Incoming interface: Vlan91, RPF nbr 192.168.29.1
Outgoing interface list:
Vlan3049, Forward/Dense, 3d03h/stopped
Vlan5, Forward/Sparse-Dense, 1w0d/00:02:54
и тд.
Т.е. для каждой группы по две записи.