From: Maxim Kurushkin (m.kurushkin@orange-ftgroup.ru)
Date: Mon Jan 22 2007 - 06:36:56 ART
>> 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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