nosx
join:2004-12-27
00000
kudos:5 | reply to tubbynet
Re: [H/W] nexus 6k released... Tubby, as they cited low latency (cut through) for high frequency trading you can count on it having one of the worlds smallest TCAM tables ever.
Imagine having to check N layers deep to find egress forwarding information for every packet, doing that 40 gazillion times per second limits how big the table can be.
The Gumball platform is similarly crippled with ~3000 effective ipv4 routes in the forwarding table when in "warp" mode.
"Warp mode: For those customers with smaller environments who demand the lowest latencies possible, warp mode consolidates forwarding operations within the switching ASIC, lowering latency by up to an additional 20 percent compared to normal operation. In this mode, latencies as low as 190 ns can be paired with the smaller of the Layer 2 and Layer 3 scaling values listed later in this document in Table 5."
As an added benefit, "ipv6" does not appear on the gumball datasheets... anywhere... any of them... Another victim of the quest for lower latency through the switch. |
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aryobaPremium,MVM
join:2002-08-22
kudos:3 | We have been trying to get the Nexus 3K (that Cisco claimed as the low-latency switch) to no avail. Apparently Cisco only produced very few of it, and every time customer tried to do benchmarking or demo on it; Cisco had to wait until other customer had completed their test on the switch. In other word, the very same switch had been circling around between customers and none of those customers were ever be able to buy it due to limited production situation.
I wonder if the same thing happen with this Nexus 6K  |
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 tubbynetreminds me of the danse russePremium,MVM
join:2008-01-16
Chandler, AZ
kudos:1 | reply to nosx
said by nosx:Tubby, as they cited low latency (cut through) for high frequency trading you can count on it having one of the worlds smallest TCAM tables ever.
Imagine having to check N layers deep to find egress forwarding information for every packet, doing that 40 gazillion times per second limits how big the table can be.
The Gumball platform is similarly crippled with ~3000 effective ipv4 routes in the forwarding table when in "warp" mode.
3 -- not disputing that it will have limited viability.
however -- if you're requiring low-latency bits -- then what good is using a low-latency platform for access -- just to have that gain lost in the agg layer?
sure -- its crippled. sure -- it has small tcam. sure -- they bill it as the next big thing until you look behind the curtain.
however -- if you can keep your tables small -- keep the 6004 as a small pod agg -- keep only a default route up to your core -- you may be in good shape.
i'm not saying its a panacea. cisco has to walk a fine line about where this platform is to be positioned. make it too kick ass -- you'll piss off the four years of n7k install base.
make it too sucktastic -- you'll never recoup anything near your r&d costs.
i can see a use for it. not saying its for everyone -- but i can see a use.
q.
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"...if I in my north room dance naked, grotesquely before my mirror waving my shirt round my head and singing softly to myself..." |
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sk1939Premium
join:2010-10-23
Washington, DC
kudos:9 | I'm still wondering if this will compete with the N5k (we just added a handful for top-of-rack/core use). |
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tubbynetreminds me of the danse russePremium,MVM
join:2008-01-16
Chandler, AZ
kudos:1 | said by sk1939:I'm still wondering if this will compete with the N5k (we just added a handful for top-of-rack/core use).
the 6001 -- most definitely.
the 6004 can -- as it will be a very dense 40gb aggregator -- but due to the throughput through the box -- it can also be used as a small aggregation.
its all based on use case, price, and features required.
you'll want to look at the deeper details (mac limits, routing, tcam, etc) for if it supports what you need it to.
just because its newer -- doesn't always mean better.
regards,
q.
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"...if I in my north room dance naked, grotesquely before my mirror waving my shirt round my head and singing softly to myself..." |
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