Re: Root Bridges in PVST..

So if one light goes out, do they all go out? ;)

*Scott Morris*, CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider) #4713,

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Jared Scrivener wrote:
> The post below isn't entirely accurate.
>
> Intra-vlan traffic will flow towards the root bridge only if switches are on
> either side of the root bridge. If they are on the same side then traffic
> will flow directly between them.
>
> Imagine the switch STP domain like a Christmas tree where the root bridge is
> the star at the top and all other switches are ornaments on one side or
> another (per-VLAN in MST, PVST or Rapid-PVST). To get from one ornament to
> another you can either go down or up your side of the tree depending on
> where your destination happens to be. The only thing you can't do is go
> across the bottom of the tree, because that's where STP is blocking or
> discarding (and where ornaments fall off). I hope that helps, Jitendra.
>
> Cheers,
>
> Jared Scrivener CCIE3 #16983 (R&S, Security, SP), CISSP
> Sr. Technical Instructor - IPexpert, Inc.
> URL: http://www.IPexpert.com
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
> Mailto: jscrivener_at_ipexpert.com
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Jitendra Anbu
> Sent: Wednesday, 24 June 2009 8:31 PM
> To: 'peter ehiwe'
> Cc: CCIE R/S, Groupstudy
> Subject: RE: Root Bridges in PVST..
>
> Thanks Peter, I am still trying to get my head around this one. My
> understanding was regardless on the VLAN connectivity; all layer 2 traffic
> will traverse the RB.
>
> Which sounds kinda of inefficient, because if you have a large network of
> say 50 switches & one RB. But, if you split between a few a few RBs based on
> the VLANs this does not sound that bad.
>
> Thanks again.
> ---------------------------------------------------------
> Regards,
>
> Jit
>
>
>
> -----Original Message-----
> From: peter ehiwe [mailto:ccie.in.nigeria_at_gmail.com]
> Sent: Thursday, 25 June 2009 4:06 AM
> To: Jitendra Anbu
> Cc: CCIE R/S, Groupstudy
> Subject: Re: Root Bridges in PVST..
>
> Intra vlan traffic can go thru the root bridge depending on were
> clients assigned to the vlan in question are located , if the clients
> communicating span multiple switches that make up the spanning tree
> topology then intra vlan traffic has to flow thru the root bridge for
> the hosts to communicate the same goes for mst.
>
> HTH
>
> Regards,
>
> Peter
>
> On 6/24/09, Jitendra Anbu <Jitendra.Anbu_at_optus.com.au> wrote:
>
>> Hi there,
>>
>> Can someone explain ., if switches are running PVST, would INTRA-VLAN
>> communication need to go through the root bridge? How would this differ in
>> MST?
>>
>> Thanks,
>>
>> Jit
>>
>>
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Received on Wed Jun 24 2009 - 22:56:55 ART