From: Maxim Kurushkin (m.kurushkin@orange-ftgroup.ru)
Date: Mon Jan 22 2007 - 04:53:43 ART
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 <http://152.1.54.4/> 255.255.255.0
<http://255.255.255.0/>
encapsulation ppp
ip igmp join-group 225.4.4.4 <http://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 <http://152.1.54.5/> 255.255.255.0
<http://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 <http://225.4.4.4/>
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 225.4.4.4 <http://225.4.4.4/>, timeout
is 2 seconds:
Reply to request 0 from 152.1.54.4 <http://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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This archive was generated by hypermail 2.1.4 : Thu Feb 08 2007 - 23:46:57 ART