From: Nitin Venugopal (nitinsworld@gmail.com)
Date: Tue Mar 17 2009 - 17:10:42 ART
1) ISIS hello interval should be minimal and you can disable the 'isis
hello-padding'
By default the IS-IS Hello PDUs are padded to the full MTU size, possibly
having a negative impact on time-sensitive application traffic that travels
across low-bandwidth interfaces or on interface buffer resources when
frequent hellos are configured. It is recommended to globally disable hello
padding.
http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/isfscbp.html#wp1055070
Best Regards
Nitin
On Wed, Mar 18, 2009 at 12:02 AM, Pavel Bykov <slidersv@gmail.com> wrote:
> Well, SPF calculation interval in stable topology will not affect CPU that
> much.
> If I would receive a question like that, aside from doing what already has
> been said, I would max out hellos using "isis hello-interval 65535" and
> would also increase throttling and retransmit intervals to the maximum
> values... But you know, to minimize the CPU usage by ISIS to absolute
> minimum, there is only one command:
>
> router isis
> protocol shutdown
>
> so,.. I'd read the question again and maybe see a pointer about what to
> leave untouched.
>
>
> On Mon, Mar 16, 2009 at 12:32 PM, Rich Collins <nilsi2002@gmail.com>
> wrote:
>
> > So would you then choose the maximum interval allowed - 120 seconds
> > and then what should you choose for the initial wait? How about
> > adjusting the PRC interval as well?
> >
> > Rgds,
> > Rich
> >
> > router(config-router)#spf-interval ?
> > <1-120> Interval between consecutive SPFs in seconds
> > level-1 Set interval for level 1 only
> > level-2 Set interval for level 2 only
> >
> >
> > router(config-router)#spf-interval 120 ?
> > <1-120000> Initial wait before first SPF in milliseconds
> > <cr>
> >
> > Minimum interval between partial route calculations
> >
> > router(config-router)#prc-interval ?
> > <1-120> PRC interval in seconds
> >
> >
> >
> >
> > On Sun, Mar 15, 2009 at 10:14 PM, Ronnie Angello
> > <ronnie.angello@gmail.com> wrote:
> > > Look into incremental SPF - the command would be ispf under the is-is
> > > process with the appropriate L1 / L2 options.
> > >
> > > On Sun, Mar 15, 2009 at 4:06 PM, Dishan Gamage <dishanlg@gmail.com>
> > wrote:
> > >> Dear GS
> > >>
> > >> If a question asks to minimize the cpu/memory resource usage on a
> router
> > >> running isis what commands should be configured under the interface ?
> > >>
> > >> Tks in advance
> > >> Dishan
> > >>
> > >>
> > >> Blogs and organic groups at http://www.ccie.net
> > >>
> > >>
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> > >>
> > >>
> > >>
> > >
> > >
> > >
> > > --
> > > Ronald Angello
> > > CCIE 17846
> > > CCDP, CCIP, CCNP
> > >
> > >
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>
> --
> Pavel Bykov
> ----------------
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