From: GAURAV MADAN (gauravmadan1177@gmail.com)
Date: Sat Aug 02 2008 - 04:35:44 ART
Just to add ( not related to question you asked ) ...
One can actually see that on a diameter of X .. what will be that
value of hello , max-age and forward delay ..
The values of 2 sec for hello , 15 for FWD , 20 for max age are for Diameter 7 .
on SW :
***********
Rack1SW1#test spanning-tree diameter 7
diameter 7 and hello time 2 gives max age = 20 and forward delay 15
Rack1SW1#test spanning-tree diameter 6
diameter 6 and hello time 2 gives max age = 18 and forward delay 13
==========================================================
On Sat, Aug 2, 2008 at 5:40 AM, Scott Morris <swm@emanon.com> wrote:
> You are correct. If you dig into the spec for spanning-tree (original
> 802.1D) you'll find some formulas for determining the timers that are based
> off of an assumed max diameter. If you change the diameter command you will
> influence your timers.
>
> It ranks up there with the idea of the 100meters length of twisted pair
> ethernet cable. You CAN go longer, but you start getting some slightly
> dysfunctional results in certain cases. ;) Same with STP.
>
> HTH,
>
>
> Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
> CCSI/JNCI-M/JNCI-ER
> Senior CCIE Instructor
>
> smorris@internetworkexpert.com
>
>
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Outside US: 775-826-4344
>
>
> Knowledge is power.
> Power corrupts.
> Study hard and be Eeeeviiiil......
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Hobbs
> Sent: Friday, August 01, 2008 5:32 PM
> To: GS CCIE-Lab
> Subject: Does "spanning-tree root primary diameter" really limit a number of
> hops between hosts on an L2 network?
>
> I got a task that said to limit the number of switches between hosts on an
> L2 network. I knew what they wanted, but I don't like this wording at all.
> There's no TTL in an ethernet header!
>
>
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