Re: need advice on the following questions

Hi,

The BPDUs between 802.1d and 802.1w (RSTP) are different essentially for compatibility reasons. Since 802.1d uses only 2 bits in the type field, and 802.1w uses the other 6 bits instead, it makes it easy for the switch to tell who it is talking to on the other side. 802.1w is compatible with both kinds, and it needs to know what is on the other end to adapt properly. As far as what bits specifically are "on" or "off" and what exactly they mean, I would say it is RFC time for you my friend. I hope that helps.

Regards,
Joe Astorino, CCIE #24347

"He not busy being born is busy dying" -- Dylan

----- Original Message -----
From: "imran ali" <immrccie_at_gmail.com>
To: "Marko Milivojevic" <markom_at_ipexpert.com>
Cc: "ehtesham ali" <conect2ehtesham_at_gmail.com>, ccielab_at_groupstudy.com
Sent: Saturday, May 22, 2010 8:51:29 AM GMT -05:00 US/Canada Eastern
Subject: Re: need advice on the following questions

Thanks Marko ,

my second question was how to explain RSTP mechanism in more detail i mean
in bit lavel .
as 80.2.1D uses on tc and tca bits of bpdu type field where as RSTP uses all
8 bits .

if you can explain me or point me to any reference which explains how type
field is handled in RSTP . that would be great help.

On Sat, May 22, 2010 at 5:22 PM, Marko Milivojevic <markom_at_ipexpert.com>wrote:

> 1. It will use the one it learns first.
>
> 2. What about it? :-)
>
> --
> Marko Milivojevic - CCIE #18427
> Senior Technical Instructor - IPexpert
>
> YES! We include 400 hours of REAL rack
> time with our Blended Learning Solution!
>
> Mailto: markom_at_ipexpert.com
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
> Web: http://www.ipexpert.com/
>
> On Sat, May 22, 2010 at 10:32, ehtesham ali <conect2ehtesham_at_gmail.com>
> wrote:
> > HI experts ,
> > i had the following B questions
> >
> > scenario
> >
> > B B B B B B B B B B B B B B B s0/0 B
> -----------------------s0/0
> > B lo ========R1 B B B B B B B B B B B B B B B B B B B
> B B B B R2
> > B 10.0.0.1/24 B B B B B B s0/1 -------------------------s0/1
> >
> >
> > question : R1 and R2 are running two different process is under ospf and
> > both part of area 0
> >
> > lo network 10.0.0.0 /24 is advertised B in OSPF process id 1 along with
> s0/0
> >
> > also advertised in OSPF porcess B id 2 along with s0/1
> >
> >
> > how R2 determines form which process id it should accept the
> > 10.0.0.0/24network .??? .cost of all links are equal.
> >
> > B B will R2 maintains two different link state databases ?
> >
> >
> > 2) RSTP mutual proposal & agreement
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Sat May 22 2010 - 16:41:14 ART