Re: STP queries

what is the benefit of transmit hold-count ...

Regards,

On Mon, Dec 13, 2010 at 12:50 PM, GAURAV MADAN <gauravmadan1177_at_gmail.com>wrote:

> Answer to your 2nd part of question :
>
> You must be knowing that default value of STP timers are decided
> keeping in consideration that network diameter is 7 . hence network
> diameter of 7 gives hello=2 , fwd delay = 15 and max age = 20 seconds
> .
>
> I think What they mean to say is that ; when you change one parameter
> ; you should make sure other is also changed appropriately .
>
> See below example :
>
> SW1#test spanning-tree diameter 7
> diameter 7 and hello time 2 gives max age = 20 and forward delay 15
> SW1#
>
> SW1#test spanning-tree diameter 2
> diameter 2 and hello time 2 gives max age = 10 and forward delay 7
> SW1#
>
> Hence ; if you wish to modify your STP such a way that your network
> diameter is 2 ; these are the timers that you need to set on root of
> your STP .
>
> I hope I made things clear to you .
>
> Thanks
> Gaurav Madan
> CCIE # 23863
>
> On Mon, Dec 13, 2010 at 2:15 PM, Faisal Ilyas <faisal.learning_at_gmail.com>
> wrote:
> > Salam,
> >
> > I have two queries regarding STP 802.1d
> >
> > 1 - the STP states from
> disabled->blocking->listening->learning->forwarding.
> > If all the switches and its port are in blocking state then how they
> > initiate the process of sending BPDU as blocking port is allowed to
> receive
> > only BPDUs so that the switch can hear from other neighboring switches.
> >
> > 2 - Cisco recommends that if the changes needs to be made, only the
> network
> > diameter value should be modified on the Root Bridge Switch, When the
> > diameter is changed, the switch calculates new values for all three STP
> > timers automatically. So, how can we change the diameter value ???
> >
> >
> > --
> > Regards,
> > M. Faisal.
> >
> >
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> >
>

-- 
Regards,
M. Faisal.
Blogs and organic groups at http://www.ccie.net