Re: Nexus 5K vPC Peer link 1Gb over OM2 Fiber

I see CCIE as a way to optimize designs made by people who don't have much
sense ;) I

So sounds like the 1G won't work at all. I would also agree that trying to
push 10G past the distance limitations of the physical media is also very
risky.

Might want to call out the cable contractor and put in some OM4. You can
use the OM2 as a pull string.

Regards,

Marc

Marc Edwards
CCIE #38259

On Thu, Apr 4, 2013 at 12:45 PM, Ryan West <rwest_at_zyedge.com> wrote:

> On Thu, Apr 04, 2013 at 15:26:25, marc edwards wrote:
> > Subject: Re: Nexus 5K vPC Peer link 1Gb over OM2 Fiber
> >
> > I would agree that vPC doesn't forward much data under normal
> > circumstances... But what about forwarding mechanism in failure
> scenarios?
> > If not addressing these during design, then one learns the hard way if
> > the unfortunate situation happens. (ie switch failure down stream on
> > chassis one causing forwarding only on chassis 2 but also a link
> > failure on chassis two upstream to router)
> >
> > The whole concept of multi chassis solutions is to provide HA in
> > failure scenarios which won't interrupt or cause severe limitations to
> > data forwarding. If not setting up the vPC peer link for such
> > scenarios, than why go with a multi chassis solution at all?
> >
>
> Planning for failures, that's crazy talk. The CCIE is all about designing
> stuff that doesn't make much sense. I've carried that into the real world
> :)
>
> If you re-read what I wrote, I wasn't defending running it at 1G, I was
> just saying that under normal circumstances there should be little to no
> traffic across it. You have a design issue if there is. I also mentioned
> that I create mine using two links, a design recommendation. Offhand, I
> wasn't sure if it would form over 1G, but checked and found that it will
> throw an error.
>
> I would venture to say that more problems come from Layer 3 VPC, than
> would arise from the choke of a 1G connection as a VPC peer link. Just
> throw a management port of a Netapp in the mix and watch the fun begin. I
> would like to see some of the limitations of the peer link relaxed if layer
> 3 is involved. After all, I'm burning 20Gbps worth of ports on both
> devices for a failure that might happen once in the next 5 years.
>
> -ryan

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Received on Thu Apr 04 2013 - 12:52:17 ART