From: Bit Gossip (bit.gossip@chello.nl)
Date: Sun Jan 28 2007 - 07:06:15 ART
Hi Maxim,
there is still one thing missing: even if IGMP is enable as you show,
multicast routing is NOT until pim is configured on the interface.
Thanks,
Luca.
r2(config)#ip multicast-routing
r2(config)#do show ip multicast interf <--- no intf mcast enabled
r2(config-if)#ip igmp join-group 224.224.224.224
r2(config-if)#do show ip multicast interf
FastEthernet0/0 is up, line protocol is up
Internet address is 10.1.2.2/24
Multicast routing: disabled <-- NO mcast routing yet
Multicast packets in/out: 177/0
Multicast TTL threshold: 0
Multicast Tagswitching: disabled
On Mon, 2007-01-22 at 12:36 +0300, Maxim Kurushkin wrote:
> >> when you configure 'ip igmp join' you dont enable igmp
> I'm not so sure...
>
> Rack1R1#sh run | i pim|multicast <- no pim and multicast configured
> Rack1R1#
> Rack1R1#sh run in fa 0/0
> interface FastEthernet0/0
> ip address 152.1.125.1 255.255.255.0
> ip igmp join-group 225.1.1.1
> Rack1R1#sh ip igmp interface
> FastEthernet0/0 is up, line protocol is up
> Internet address is 152.1.125.1/24
> IGMP is enabled on interface <----- !!!!!!!!!!!!!!!!!!!!!!!!!!!1
> Current IGMP host version is 2
> Current IGMP router version is 2
> IGMP query interval is 60 seconds
> IGMP querier timeout is 120 seconds
> IGMP max query response time is 10 seconds
> Last member query count is 2
> Last member query response interval is 1000 ms
> Inbound IGMP access group is not set
> IGMP activity: 1 joins, 0 leaves
> Multicast routing is disabled on interface
> Multicast TTL threshold is 0
> Multicast groups joined by this system (number of users):
> 225.1.1.1(1)
> Rack1R1#
>
> WBR,
> Maxim
>
> Bit Gossip wrote:
> > 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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> >>>>
> >>>>
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