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Re: [armd] address resolution requirement from hosts to overlay edge nodes. Any opinion?

"Michael K. Smith - Adhost" <mksmith@adhost.com> Wed, 22 February 2012 23:34 UTC

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From: "Michael K. Smith - Adhost" <mksmith@adhost.com>
To: Linda Dunbar <linda.dunbar@huawei.com>, Igor Gashinsky <igor@yahoo-inc.com>
Thread-Topic: [armd] address resolution requirement from hosts to overlay edge nodes. Any opinion?
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Date: Wed, 22 Feb 2012 23:34:51 +0000
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Cc: Thomas Narten <narten@us.ibm.com>, "armd@ietf.org" <armd@ietf.org>
Subject: Re: [armd] address resolution requirement from hosts to overlay edge nodes. Any opinion?
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> -----Original Message-----
> From: Linda Dunbar [mailto:linda.dunbar@huawei.com]
> Sent: Wednesday, February 22, 2012 3:17 PM
> To: Igor Gashinsky
> Cc: Michael K. Smith - Adhost; AshwoodsmithPeter; Anoop Ghanwani; Mike
> McBride; Thomas Narten; armd@ietf.org
> Subject: RE: [armd] address resolution requirement from hosts to overlay
> edge nodes. Any opinion?
> 
> In VRRP environment unicast address is used by hosts, not the multicast
> address, correct?
> So there is no multicast address in the Layer 2 domain as some other LB
> described in the email list (e.g. Microsoft LB)?
> 
> Linda
> 

VRRP and similar use multicast to communicate to one another (heartbeat).  The communication between the host and the default gateway is unicast.  With that said, the multicast heartbeat can be very chatty when you have thousands of VRRP pairs with sub-second heartbeat calls back and forth.

Mike

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