INE ver-4 vol-1 Multicasting lab (Dense-mode)

Sw-1------------ R3---------R1---------R5-------R6------------SW-2

Sw-2(conf)#interface FastEthernet0/0
 ip address 10.1.68.8 255.255.255.0
 ip pim dense-mode
 ip igmp join-group 224.1.1.1

Sw1#ping 224.1.1.1

Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 224.1.1.1, timeout is 2 seconds:
.
Sw1#ping 10.1.68.8

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.68.8, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/42/80 ms
Sw1#

PIM DENSE-MODE is run betweent the interfaces
Ospf is enabled as the routing protocol

Question
1) Why is it that there is no reply recieved in Sw-1 ?
2)If I configure an interface in R1 or R3 to be part of ip igmp group
224.1.1.1 then I am able to get a reply ?

What can be the problem ?

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Received on Sun Feb 28 2010 - 01:26:17 ART