From: nikolai (niko@4ovek.com)
Date: Sat Aug 05 2006 - 19:36:15 ART
"Internet Group Management Protocol (IGMP) snooping constrains the
flooding of multicast traffic by dynamically configuring the interfaces
so that multicast traffic is forwarded only to those interfaces
associated with IP multicast devices."
"Catalyst 2950 switches support a maximum of 255 IP multicast groups and
support both IGMP version 1 and IGMP version 2. By default, IGMP
snooping is globally enabled on the switch. By default, IGMP snooping is
enabled on all VLANs, but it can be enabled and disabled on a per-VLAN
basis."
Use "show ip igmp snooping [vlan vlan-id]" to verify...
-- nikolai
Aamir Aziz wrote:
> One thing i forgot to mention is that its a flat network, no vlans, anyway
> your saying that if it was a 3550 then it would not need any configuration,
> how is that?
>
> Thanks
> Aamir
>
>
> On 8/5/06, nikolai <niko@4ovek.com> wrote:
>> I would consider IGMP SNOOPING, assuming that the network is strictly L2
>> (VLAN shared between the switches). 3550/3560/3750 have IGMP snooping
>> enabled by default, since it is done on a hardware level. You might need
>> to enable it on 2950.
>>
>> Here are some useful "sh" commands:
>>
>> *********************************************************
>> CAT2#sh ip igmp snooping groups
>> Vlan Group Version Port List
>> ---------------------------------------------------------
>> 1 224.0.1.40 v2 Fa0/5
>> 1 231.231.231.231v2 Fa0/5
>> **********************************************************
>> CAT2#sh mac-address-table multicast igmp-snooping
>> Vlan Mac Address Type Ports
>> ---- ----------- ---- -----
>> 1 0100.5e00.0128 IGMP Fa0/3, Fa0/5
>> 1 0100.5e67.e7e7 IGMP Fa0/3, Fa0/5
>> **********************************************************
>>
>> -- nikolai
>>
>>
>> Aamir Aziz wrote:
>>> Hi there ppl,
>>>
>>> I have a question, two switches Sw1 and Sw2 (both 2950), on Sw1 i have a
>>> server running multicast application sending a stream to a client on
>> Sw2,
>>> the requirement is that multicast packets should only be sent and
>> received
>>> between the server on Sw1 and client on Sw2 so will the following
>>> configuration be enough:
>>>
>>> Sw1:
>>> Ip multicast-routing
>>> int fa0/1
>>> no switchport
>>> ip pim dense-mode
>>>
>>> Sw2:
>>> Ip multicast-routing
>>> int fa0/1
>>> no switchport
>>> ip pim dense-mode
>>>
>>> Do i need to put an IP on the interfaces or not?
>>>
>>> thanks
>>> Aamir
>>>
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