From: Bit Gossip (bit.gossip@chello.nl)
Date: Sun Jan 21 2007 - 08:47:21 ART
Hi Maxim,
IGMP is enabled on a interface only when pim is enabled: strange but
true. So if you do 'show ip igmp interface' you will see that
switch/f0/3 is not there
Thanks,
Luca.
On Fri, 2007-01-19 at 16:55 +0300, Maxim Kurushkin wrote:
> Good day, Group.
> I have strange behavour of 3550.
> My topology is very clear:
>
> Router <-> 3550
>
> On Router:
> interface FastEthernet0/1
> ip address 152.1.3.3 255.255.255.0
>
> On Switch:
> interface FastEthernet0/3
> no switchport
> ip address 152.1.3.8 255.255.255.0
> ip igmp join-group 225.3.3.3
>
> BUT:
> Router#ping 225.3.3.3
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 225.3.3.3, timeout is 2 seconds:
> .
> Router#
>
> Ping work only if I switch on pim on switch:
>
> interface FastEthernet0/3
> no switchport
> ip address 152.1.3.8 255.255.255.0
> ip pim dense-mode
> ip igmp join-group 225.3.3.3
>
> Then:
> Router#ping 225.3.3.3
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 225.3.3.3, timeout is 2 seconds:
> Reply to request 0 from 152.1.3.8, 4 ms
> Router#
>
> Why Switch dont work like host (multicast receiver)? Why it work only
> with PIM enabled on interface?
>
> WBR,
> Maxim
>
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