Re: Design issue

Thats exactly how i'm seeing it.
I have pretty dense traffic coming in through the access to the servers, so
the core-core link would be kind of a bottle neck if i have 6 access-core
connections on 1 core (60 gigs), and all these having to traverse the
core-core link to reach to the active core ( for the servers) . Meaning,
active for clients might not be active for the servers.

But then again if I have 10 gig or even 2x10 Gig to the server switch, that
will be the bottle neck.

On Tue, May 3, 2011 at 6:04 AM, JB Poplawski <jb.poplawski_at_gmail.com> wrote:

> I was just actually drawing this up for a similar situation.
>
> You're correct, traffic would traverse that link. Diversifying the
> vlans across multiple cores just makes both cores work. You could in
> essence put all SVIs, HSRP and STP roots on one box, and leave the
> other for failover. You'd beat up the backplane on one switch, the
> other would be sleeping.
>
> Now in the next example (10G to the core) one port will be active and
> one will be blocking per VLAN. *Provided you're not using VSS* So
> Vlan1 would traverse link 1 (Stp would block link 2) and Vlan 2 would
> traverse line 2 (stp would block link 1).
>
> If you're worried about cranking the 10G at the core, double-em up
> (port channel) and you'll have 20Gs between the two cores.
>
> Does that make sense, or am I off the mark?
>
> HTH,
> JB
>
> On Mon, May 2, 2011 at 12:27 PM, Ahmed <ahmedsalim_at_gmail.com> wrote:
> > In a collapsed core, what be the most ideal place for servers.
> >
> > 1. Cost wise
> > 2. Design wise
> >
> > I'm assuming odd SVI's on Core1 and even on Core2.
> >
> > The problem:
> >
> > If servers connect directly to core, assuming default gatway on Core1,
> the
> > even vlans( whose HSRP primgary group and hence STP Primary would be core
> 2)
> > traffic traverse the CORE-CORE link to go to the servers ....
> >
> > If servers connected through a switch, 10 gig uplink to each core, how
> would
> > each (odd and even ) vlan traffic flow to the servers ...
> >
> > Ahmed
> >
> >
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Received on Tue May 03 2011 - 21:09:30 ART