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Re: [armd] Multicast in the data center [was Re: address resolution

Linda Dunbar <linda.dunbar@huawei.com> Wed, 15 February 2012 14:56 UTC

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From: Linda Dunbar <linda.dunbar@huawei.com>
To: Aldrin Isaac <aldrin.isaac@gmail.com>, Thomas Narten <narten@us.ibm.com>
Thread-Topic: [armd] Multicast in the data center [was Re: address resolution
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Date: Wed, 15 Feb 2012 14:53:11 +0000
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Cc: "armd@ietf.org" <armd@ietf.org>
Subject: Re: [armd] Multicast in the data center [was Re: address resolution
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Aldrin, 

Is "pub-sub" same as "Publish-subscribe" related applications? 
Are all the "subscribers" in the same subnet as the "publisher"? 
If yes, it is almost like many multicast groups being created (in real time?), with subscribers subscribing to a subset of the multicast groups, isn't it? 
If they are in different subnets, is it like L3 multicast?

Linda

> -----Original Message-----
> From: armd-bounces@ietf.org [mailto:armd-bounces@ietf.org] On Behalf Of
> Aldrin Isaac
> Sent: Wednesday, February 15, 2012 8:40 AM
> To: Thomas Narten
> Cc: armd@ietf.org
> Subject: Re: [armd] Multicast in the data center [was Re: address
> resolution requirement from hosts to overlay edge nodes. Any opinion?]
> 
> 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
> >
> > _______________________________________________
> > armd mailing list
> > armd@ietf.org
> > https://www.ietf.org/mailman/listinfo/armd
> 
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