Date: Mon, 03 Mar 2008 12:47:40 +0000 From: "Bruce M. Simpson" <bms@FreeBSD.org> To: Willem Jan Withagen <wjw@digiware.nl> Cc: =?ISO-8859-1?Q?=3Fukasz_Bromirski?= <lukasz@bromirski.net>, net@freebsd.org, Ingo Flaschberger <if@xip.at>, Barney Cordoba <barney_cordoba@yahoo.com> Subject: Re: FBSD 1GBit router? Message-ID: <47CBF36C.9000702@FreeBSD.org> In-Reply-To: <47CBF16C.6020704@digiware.nl> References: <alpine.LFD.1.00.0803012014350.20402@filebunker.xip.at> <497111.42659.qm@web63905.mail.re1.yahoo.com> <20080301225727.GA85851@owl.midgard.homeip.net> <47CAADB8.9000202@digiware.nl> <47CC304F.6040006@bromirski.net> <47CBF16C.6020704@digiware.nl>
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Willem Jan Withagen wrote:
> =A3ukasz Bromirski wrote:
>> Wouldn't it be a case for use of multicast vs unicast? Hardware
>> is always better anyway, so why not invest in some switch that
>> can do unicast/multicast in hardware?
>
> Usefull suggestion, only this is going to be in an overlay cloud where
> we do not have control over all the endpoint networks. let alone that w=
e
> can get them to use multicast. And even those that use multicast in the=
ir
> last-mule equipment, don't always have correct setups.
>
> My experience is that Multicast in nice in theory and experiment, but=20
> when
> push comes to shove it does not completely deliver.
I have to agree wholeheartedly, for more detail than you can shake a=20
stick at, look here:
http://www.cs.ucr.edu/~michalis/COURSES/204-02b/papers/ramalho.html
If you're running over MPLS all bets are off. MPLS is like ATM in the=20
sense that it ain't got no multicast grok, as far as I can fathom,=20
anyway. Label switching is label switching. I never saw any support for=20
the notion of 1:M in the LSPs.
Multicast is more likely to succeed at the moment when you have complete =
knowledge of the network topology, and IP layer visibility. There are=20
ongoing efforts to address these limitations.
later
BMS
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