Re: [OT]Creating a unidirectional link failure scenario

Radioactive Frog @ 07/04/2012 22:57 -0300 dixit:
> Well the pros of auto are;
> 1. This initial thread would not hve opened if there was auto auto in
> both side. Auto picks up UDLD. When one strand was pulled GSR would also
> hve shown interface status down.
I guess this only applies to fiber, but point taken.

> 2. Hard coding wouldn't pick up on the link quality. What if u set port
> to be 1 gb full and suddenly there're EMI or electronics noise. You will
> see a lit of retransmission. Certain apps will stop working.

Are you saying that auto negotiation kicks in again because of link
degradation, ala DSL ? I was not aware of that at all.
Also, your example uses 1gig, I was not aware you can have gig links
in fixed setup, is that the case ?

>
> The list goes on....
>
> Still old gear do bot support auto auto type scenario. Most new gear hve
> support for auto.

But I am aware of some duplex missmatch caused for 100Mb auto
negotiation issues too.

>
> 3. I can open the link.

Strange, it goes to www.oracle.com/us/sun/index.htm from here.
-Carlos
>
> On Sunday, April 8, 2012, Carlos G Mendioroz wrote:
>
> Well, I'm on that side (i.e. I like infrastructure links to be fixed
> in whatever speed / duplex they have to be) but this is obviously
> kind of
> a late thing, given that there is litle "infrastructure" running at
> these speeds nowadays...
>
> But if that was the case, what are the pros to auto ?
>
> (That pdf link was dead to me BTW)
> -Carlos
>
> Ryan West @ 07/04/2012 11:28 -0300 dixit:
>
> Hard coding is a sure way to cause extra work troubleshooting in
> the future.
>
> Sent from handheld
>
> On Apr 7, 2012, at 7:38 AM, "Radioactive
> Frog"<pbhatkoti_at_gmail.com> wrote:
>
> Sundeep - Try duplex and speed setting to "AUTO" on both side.
> Most algorithms on newer device/code are written to detect
> UDLD. In fact I
> was in CiscoLive this year and folks recommend to turn AUTO
> setting for
> fiber port.
>
> "Auto" does do some magic (compared to hard coding). I still
> see a lot of
> old administrator telling me to do manual. Why would one do
> it manual if
> sees no runt, fcs erros and late collisions?
>
> Thats, beside the point but;
>
> You may have to read this nice paper written ( a bit old but
> still helpful,
> written way back in 2004).
> Most people think - Coding duplex and speed manually is the
> "ANSWER" to
> everything.
> That is not entirely true :)
>
> http://www.sun.com/blueprints/__0704/817-7526.pdf
> <http://www.sun.com/blueprints/0704/817-7526.pdf>
>
> HTH
> frog
>
> On Fri, Apr 6, 2012 at 12:37 AM, sundeep sadhwani<
> sundeep.sadhwani_at_gmail.com> wrote:
>
> I am probably thinkin of goin with bfd.
> On Apr 5, 2012 10:33 PM, "Narbik
> Kocharians"<narbikk_at_gmail.com> wrote:
>
>
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> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net