From: Bit Gossip (bit.gossip@chello.nl)
Date: Mon Jan 22 2007 - 05:14:04 ART
Hi Maxim,
when you configure 'ip igmp join' you dont enable igmp but simply
statically join a group as a client
Thanks,
Luca
On Mon, 2007-01-22 at 08:53, Maxim Kurushkin wrote:
> Hi, Group.
> Sorry, Bit. but "IGMP is enabled on a interface only when pim is
> enabled" is not true.
> Because it works with Router-Router but not works with Router-3550. I
> guess that it is something specific with multicast working on
> switches, but I can't find any information about it.
>
> Example with Router-Router:
> R5 s0/1 <--- PPP ---> s 0/1 R4
>
> R4:
> ip multicast-routing
> interface Serial0/1
> ip address 152.1.54.4 255.255.255.0
> encapsulation ppp
> ip igmp join-group 225.4.4.4
> <- there is no ip pim command on this interface !!!
>
> R5:
> ip multicast-routing
> interface Serial0/1
> ip address 152.1.54.5 255.255.255.0
> ip pim dense-mode
> encapsulation ppp
> clock rate 512000
>
> And it's work WITHOUT PIM enabled on R4:
>
> Rack1R5#ping 225.4.4.4
> Type escape sequence to abort.
> Sending 1, 100-byte ICMP Echos to 225.4.4.4, timeout is 2 seconds:
> Reply to request 0 from 152.1.54.4, 4 ms
>
> But with 3550 it's not work!!! Why?
>
> WBR,
> Maxim
>
>
> Bit Gossip wrote:
> > 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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