[j-nsp] 802.3ad Question
acronopio at gmail.com
Mon Jan 18 02:42:49 EST 2010
Thanks a lot Mark and Richard
very clarifying !
On Fri, Jan 15, 2010 at 12:43 AM, Richard A Steenbergen <ras at e-gerbil.net>wrote:
> On Fri, Jan 15, 2010 at 09:18:01AM +0800, Mark Tinka wrote:
> > Not quite - what I did say was:
> > "We're aggregating 3x Gig-E links between both devices, and
> > it's working fairly well. Traffic distribution from the
> > M7i to the 6500 is 1:1:1, while traffic
> > distribution from the 6500 to the M7i is 1:1:0.7 (but this
> > direction is governed by other Layer 3 devices
> > upstream of the 6500)."
> The 6500/7600 platform (or at least the current generation of cards)
> have only 8 hash buckets available, so if you use a non power-of-2
> number of links like 3 above, what you're actually getting is 3:3:2. The
> problem gets worse as the number of active links increases, so that if
> you have 8 links at 1:1:1:1:1:1:1:1 and you lose one it becomes
> 1:1:1:1:1:1:2, effectively behaving like you only had 4 links instead of
> 7 (well, at least if you care about delivering half the packets on that
> 7th link at any rate).
> I'm not aware of any major router vendor who still sells a product with
> anything even beginning to approach this level of BAD. Juniper, Foundry,
> Extreme, Force 10, etc, all have this pretty much nailed down.
> Richard A Steenbergen <ras at e-gerbil.net> http://www.e-gerbil.net/ras
> GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)
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