[c-nsp] multicast 3750X

[selamat pagi]

Here is part of my LAB-setup:

PE              (RP lo 0)
 vrf RED   (ip igmp join-group 239.5.5.5)
 ¦
 ¦   PIM
 ¦
 CE      (SVI / PIM SM (ip igmp join-group 239.6.6.6)
 ¦
 ¦   IGMP
 ¦
 Receiver      (ip igmp join-group 239.8.8.8)

--------------------------------------------
PE5           6500 151-1.SY1
CE   3750X             150-2.SE2
Receiver      3750X             150-2.SE2
--------------------------------------------
The issue is:
Receiver can reach 239.6.6.6 and 239.5.5.5
PE or CE cannot reach 239.8.8.8

Changing CE and receiver from 3750X to 6500,  MC-ping works from all 3
devices to any MC-group.

PE:
(*, 239.8.8.8), 02:43:40/00:02:45, RP 5.5.5.5, flags: S
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    TenGigabitEthernet2/5, Forward/Sparse, 02:39:09/00:02:45

(5.5.5.5, 239.8.8.8), 00:14:15/00:02:57, flags: T
  Incoming interface: Loopback0, RPF nbr 0.0.0.0
  Outgoing interface list:
    TenGigabitEthernet2/5, Forward/Sparse, 00:14:15/00:02:45


Debug on CE does not show any output. (deb ip icmp)

Is there any 3750X specific command I need to enable ?

Any idea or troubleshooting advice is greatly appreciated.

many thanks, keti