Re: ISIS incremental SPF

ISPF only calculates those elements of the SPF tree that have changed or are
affected by a change. This saves time and CPU use on the router it is
enabled on as it doesn't have to recalculate the full SPF algorithm for
stable network sections.

I don't know of any reason not to enable it everywhere in theory or in
practice, so if anyone has one I'd be glad to learn it.

On 6/9/09 4:40 AM, "Rin" <rintrum_at_gmail.com> wrote:

> Hi all,
>
>
>
> What are the differences between configuring & not configuring "incremental
> SPF" in ISIS? From the documentation, iSPF prevents the entire SPT being
> recomputed and it only computes the steps needed to apply the changes in the
> network topology diagram. So is it ok if I enable iSPF throughout the whole
> ISIS network to increase the convergence time? Is there any disadvantages?
> Thanks
>
> Rin.
>
>
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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

Blogs and organic groups at http://www.ccie.net
Received on Tue Jun 09 2009 - 10:08:20 ART