[c-nsp] IGMP snooping ME6500
ML
ml at kenweb.org
Sun Jul 12 15:12:46 EDT 2009
Adrian Minta wrote:
> Tim Stevenson wrote:
>> That's not really the critical thing, so much as - you need an IGMP
>> querier active in the VLAN in order for snooping to work
>> correctly/reliably. Some applications may behave fine without; others
>> won't. The key is periodic joins from the hosts are required to
>> maintain membership state for snooping. The querier ensures that happens.
>>
>> So what you really need is an SVI *with* an IP address for that vlan,
>> and then enable igmp snooping querier for that vlan. The configured IP
>> is used to source queries. The SVI in this case can actually be
>> shutdown, it doesn't really matter.
>>
>> The config is like:
>> int vlan 200
>> ip add 10.1.1.1/24
>> ip igmp snooping querier
>> shut
>>
>> The other option is to just enable PIM on the (admin up) SVI in the
>> vlan, but you may not want to do that, depends on the network design.
>>
>> int vlan 200
>> ip add 10.1.1.1/24
>> ip pim sparse
>> no shut
>>
>> HTH,
>> Tim
>>
> Creating an unnumbered interface didn't seems to work. Now I am trying
> your solution, the one with "ip igmp snooping querier". I don't want to
> involve the switches in any multicast routing.
>
Normally I just enable PIM on the SVI and IGMP snooping for the VLAN.
No traffic gets flooded unnecessarily.
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