Re: [Rstplib-users] RAPID!? Why!?

[Imagine T. <ter...@ya...>]

Ku,

Similar questions I asked two monthes ago.
There are the mail from Alex. It seems to be a reply.
If no - sorry.

------------ Begin of the citation ---
> Imagine,
> 
> As far as I understand and may express myself, there
> are 4 main ideas in
> .1w:
> 1. The idea of edgePort (it becomes Forwarding
> *immediately* and helps
> in Designated Port handshake, see item 3 in this
> list)
> 2. Root port becomes Forwarding *immediately*.
> 3. Designated  Port becomes Forwarding "immediately*
> after special
> (introduced in .1) "downstream handshake"
> 4. Flush Forwarding Database (when  Topology Change
> is detected) instead
> of Fast Ageing.
> 
> All other changes (including Port Path Cost, as you
> ask) in .1w are or
> small, or
> dedicated to supply these main ideas.
> 
> I hope, this brief explanation will help you.
> May you see in rstplib, that when forceVersion is
> "slow", things go slower ?
> That means, that the RSTP is a rapid one, and the
> regular (old? slow?
> legacy? - select correctest name of 802.d) STP is
> not rapid.
> 
> I'd like to advise you to read Annex F.2.3. "RSTP
> performance" in IEEE 802.1w
> 
> Best regards, Alex
------------ End of the citation ---

Concerning MSTP: I don't know. IMHO, it is *dedicated*
for muliple instances of STP on the same device.

Regards, Imagine

--- Ku <is...@ms...> wrote:
> Hi everybody,
> 
>     Sorry for this kind of stupid questions, @_@
>     I just contact the 802.1w, .1s SPEC these days,
> and find out some .1w
> simulator resource.
>     In my opinion, RSTP and MSTP defined new BPDU
> and Priority Vectors (5
> and 8) for bridges communications, SPEC    
> describes state machines for
> changing PORT ROLE respectively,
>     But I still do not understand Why RSTP can
> reconfigure STP "RAPIDLY".
> For OLD SPT Algo., bridge detect LAN         broken
> and then send TCN to the
> ROOT bridge with smallest Bridge ID, and transfer
> its own port to designated
> port. Is     it already simple and rapid?
> 
>     Could anybody explain it in more simple words!?
> or help me to pick out
> the KEY idea!
> 
>     Thanks in advance!!¡@
> 
> --Ku
> 
> 
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> Rst...@li...
>
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