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Re: [armd] Multicast in the data center [was Re: address resolution requirement from hosts to overlay edge nodes. Any opinion?]

Aldrin Isaac <aldrin.isaac@gmail.com> Wed, 15 February 2012 14:39 UTC

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From: Aldrin Isaac <aldrin.isaac@gmail.com>
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Date: Wed, 15 Feb 2012 09:39:40 -0500
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To: Thomas Narten <narten@us.ibm.com>
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Subject: Re: [armd] Multicast in the data center [was Re: address resolution requirement from hosts to overlay edge nodes. Any opinion?]
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Any DC with applications performing heavy pub-sub are more than likely using multicast.  I am aware of many companies for whom multicast is critical and enabled on their DC routers.

On Feb 15, 2012, at 9:07 AM, Thomas Narten wrote:

> Mike McBride <mmcbride7@gmail.com> writes:
> 
>> Large L2 overlay networks?  I don't know. Would be good to find out
>> from the community about performance and scalability of multicast in
>> the DC.
> 
> My impression is that many data centers do not enable IP multicast on
> their routers. That means you can use link-local multicast (which
> works fine within one IP subnet and doesn't really have scaling
> issues). But if you want multicast that goes beyond one link (and IP
> subnet), which is presumably necessary for an overlay like
> VXLAN/NVGRE, that is where you have problems.
> 
> The question is not even whether L3 multicast scales. It's whether the
> DC operater is willing to enable such multicast.
> 
> Thomas
> 
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