Neus 2000 does not have FCoE. 2010/2/9 Manu Chao <linux.ya...@gmail.com>
> Two key advantages: > - Technical: FCoE, vPC > - Management: you needn't to manage N2Ks > > R/ > Manu > > On Tue, Feb 9, 2010 at 11:40 AM, Livio Zanol Puppim < > livio.zanol.pup...@gmail.com> wrote: > >> Yeah, You are right. >> >> But I would like to use my nexus 5000 10GE/FCoE ports just for access >> servers, maximizing it's use... The uplinks from Nexus 2000 could easially >> go directly to my distribution/core. Unfortunally, nexus 2000 is just an >> fabric extender and can ONLY be attached to Nexus 5000... Maybe CISCO >> changes it's later... >> >> Let's think: >> >> 10 nexus 2000 using all uplink ports = 40 ports. Yes, 40 ports that I must >> use at my nexus 5000. That's more than 1 entirelly switch (1RU) and almost >> 1 >> switch (2RU). >> >> I haven't figure out yet what's the advantage of having this design (nexus >> 2000 -> nexus 5000) other than the "old" one (catalyst 4948 -> nexus >> 7000/cisco 6500). That's what I'm talking about. >> >> The only REAL advantage so far is the vPC... >> >> 2010/2/2 Brad Hedlund <brhed...@cisco.com> >> >> > >> > True, the Nexus 2000 does not locally switch, but lets explore that for >> a >> > second... >> > >> > 1) a typical enterprise Data Center is running applications that are not >> > latency sensitive, where latencies in the 10s of microseconds are >> perfectly >> > OK and nobody is really counting anyway. Only in the small minority of >> Data >> > Centers running high frequency trading, grid computing, or some other >> ultra >> > low latency application, every *nanosecond* matters and local switching >> with >> > fewer hops is of paramount importance. Furthermore, these applications >> are >> > quickly migrating away from 1GE to 10GE attached servers for the obvious >> low >> > latency advantages. >> > >> > 2) the Nexus 2000 has 4x10GE uplink bandwidth versus the 2x10GE uplink >> for >> > 4948. This results in a possible 1:1.2 oversubscription ratio for Nexus >> > 2000 to handle the additional uplink load that may otherwise not be >> present >> > on a 4948. >> > >> > 3) The upstream Nexus 5000 implements cut-through switching, and the >> Nexus >> > 2000 itself also uses cut-through for frames entering on 1GE and >> egressing >> > on 10GE. The two combined often results in port-to-port latencies >> similar >> > to a Catalyst 6500, even without the "local switching". If you are >> > comfortable with your Catalyst 6500 local switching latencies, you can >> > expect similar performance from a Nexus 2000/5000 combination. >> > >> > >> > -- >> > Brad Hedlund, CCIE #5530 >> > Consulting Systems Engineer, Data Center >> > bhedl...@cisco.com >> > http://www.internetworkexpert.org >> > >> > >> > >> > On Jan 31, 2010, at 5:25 PM, David Hughes wrote: >> > >> > > >> > > On 29/01/2010, at 6:54 AM, Livio Zanol Puppim wrote: >> > > >> > >> Can anyone please tell me the advantages of using Nexus 2000 over >> > Catalyst >> > >> 4948 as access layers switches? >> > >> Using Nexus 2000, I have to use at least 2 ports at my Nexus 5000, >> that >> > >> could be used by servers with 10GbE/FCoE servers. >> > > >> > > The N2K does no local switching so if you have any east-west traffic >> > between ports on the same switch you'll be better served by a more >> > "traditional" access switch. Naturally the N2K offers centralised >> > management etc etc but that may or may not be of interest depending on >> the >> > size of your deployment. >> > > >> > > >> > > >> > > David >> > > ... >> > > _______________________________________________ >> > > cisco-nsp mailing list cisco-nsp@puck.nether.net >> > > https://puck.nether.net/mailman/listinfo/cisco-nsp >> > > archive at http://puck.nether.net/pipermail/cisco-nsp/ >> > >> > >> >> >> -- >> []'s >> >> Lívio Zanol Puppim >> _______________________________________________ >> cisco-nsp mailing list cisco-nsp@puck.nether.net >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ >> > > -- []'s Lívio Zanol Puppim _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/