igmp join and ping

hi

I have a question relevant to igmp.As shown bleow I configured vlan 783 for
igmp group 228.28.28.28.And then from the source ping 228.28.28.28 .Instead
of vlna 783 ip address another interface f1/1 ip address has answered that
ping.Do i know something wrong?As far as I know only igmp join configred
interfaces have to asnwer that ping.

RSRack1R6#ping 228.28.28.28

Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 228.28.28.28, timeout is 2 seconds:

Reply to request 0 from 132.1.17.7, 740 ms

RSRack1SW1# sh ip igmp groups
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last Reporter
228.28.28.28 Vlan783 00:35:30 00:02:39 204.12.1.7
224.0.1.40 FastEthernet1/1 00:36:43 00:02:29 132.1.17.7
RSRack1SW1#sh run int vl
RSRack1SW1#sh run int vlan 783
Building configuration...

Current configuration : 115 bytes
!
interface Vlan783
 ip address 204.12.1.7 255.255.255.0
 ip pim sparse-mode
 ip igmp join-group 228.28.28.28
end

RSRack1SW1#sh run int f1/1
Building configuration...

Current configuration : 105 bytes
!
interface FastEthernet1/1
 no switchport
 ip address 132.1.17.7 255.255.255.0
 ip pim sparse-mode
end

RSRack1SW1#

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Received on Sun Aug 22 2010 - 22:11:12 ART