Re: STP, Uplink fast & Backbone fast

Hi Joe,

Thanks now it's clear. I manage to crack it with your help.

Regards
Sarad

On Mon, Nov 16, 2009 at 6:32 AM, Joe Astorino <jastorino_at_ipexpert.com>wrote:

> I think for the most part you understand what is going on here Sarad, but I
> wanted to make a few comments for you
>
> 1) Backbonefast should be implemented on all switches in the topology
> according to the documentation.
> 2) backbonefast and uplinkfast serve similar purposes, but not exactly the
> same. Think of uplinkfast as providing an alternate upllink port to the
> root bridge -- an alternate root port. Backbonefast on the other hand is
> specifically for indirect link failures and provides a backup to the
> designated port on a segment.
>
> Also, check out the following doc, it is a good one.
>
>
> http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800c2548.shtml#recovers
>
> On Sun, Nov 15, 2009 at 7:11 PM, Sarad <tosara_at_gmail.com> wrote:
>
>> Hi Group,
>>
>> Just trying to crack STP & it's features. I have some doubt on followings.
>>
>> I understand that backbone fast has a big query process compared to uplink
>> fast. Just trying to relate those two & understand please correct me if I
>> am
>> incorrrect.
>>
>> 1. When we compare uplinkfast & backbonefast, Uplink fast will be
>> configured
>> on the access layer when there are two uplinks or switch is not in the
>> transit path.
>>
>> 2. backbone fast will be implemented on the switches in the transit path
>> which has multiple links & more prone to create loops.
>>
>> Those two methods are used to acheive the same purpose but Backbonefast
>> process is more insentive as where it implements is more prons to create
>> loops than places where we implement Uplinkfast
>>
>> The other thing I am trying to crack is,
>>
>> When we introduce a new switch to stable STP network what will happen in
>> following schenarios.
>>
>> 1. New switch not become a root - In this case no user traffic will be
>> affected in any of the vlan in any existing switches
>>
>> 2. New switch becoming a root for some existing VLANs - User traffic will
>> be
>> affected till STP topology stabilized.
>>
>> Please help me to verify my understanding & observations are correct.
>>
>> regards
>> Sarad
>>
>>
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>>
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>
>
> --
> Regards,
>
> Joe Astorino CCIE #24347 (R&S)
> Sr. Technical Instructor - IPexpert
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Received on Mon Nov 16 2009 - 15:20:07 ART