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

<thomas.morin@orange.com> Thu, 01 March 2012 15:48 UTC

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Thread-Topic: [armd] Multicast in the data center [was Re: address resolution requirement from hosts to overlay edge nodes. Any opinion?]
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From: thomas.morin@orange.com
To: armd@ietf.org
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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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Hi Thomas,

Thomas Narten :
> 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).

Just a side note: using link-local multicast over a (V)LAN may imply the 
use of IGMP snooping, which may not be easier to manage than IP 
multicast (this is a euphemism) and does imply per-multicast-flow state 
maintenance on switches, likely to also involve similar scaling 
challenge (state growing linearly with the amount of flows).

-Thomas

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