Re: ISIS LSP

Rin,

after much reading i came to that conclusion. the cnsp-interval is added by
default when you add the isis network point-to-point.

But i can also set the the isis retransmit-interval as mention on the my
mail below... whats you take if the area is a level-2 to set under the
interface the isis circuit type to prevent level-1 hellos tranversing the
link?

On Sun, Jul 12, 2009 at 5:29 PM, Rin <rintrum_at_gmail.com> wrote:

> Splinter,
>
>
>
> In your first post, the task requires the least number of lsp packets. Both
> CSNP and PSNP are not LSP so the command csnp-interval or psnp-interval is
> not necessary.
>
>
>
> Rin.
>
>
>
> _____
>
> From: Splinter [mailto:splinter330_at_gmail.com]
> Sent: Sunday, July 12, 2009 4:12 PM
> To: Vinu
> Cc: Rin; Con Spathas; Cisco certification
> Subject: Re: ISIS LSP
>
>
>
> Sorry guys,
>
> failed to mention that when you enable isis network point-to-point the isis
> csnp-interval is added by default.
>
> should those timers also be adjust as 10sec is the default.
>
> Splinter
>
> On Sun, Jul 12, 2009 at 10:56 AM, Splinter <splinter330_at_gmail.com> wrote:
>
> Guys,
>
> thanx for all the inputs, This is where my confusion comes in...
>
> what about csnp-interval or psnp-interval?
>
> * Complete sequence number PDUs (CSNPs)-Contain a complete list of
> all
> LSPs in the IS-IS database. CSNPs are sent periodically on all links, and
> the receiving systems use the information in the CSNP to update and
> synchronize their LSP databases. The designated router multicasts CSNPs on
> broadcast links in place of sending explicit acknowledgments for each LSP.
> * Partial sequence number PDUs (PSNPs)-Multicast by a receiver when
> it
> detects that it is missing an LSP; that is, when its LSP database is out of
> date. The receiver sends a PSNP to the system that transmitted the CSNP,
> effectively requesting that the missing LSP be transmitted. That router, in
> turn, forwards the missing LSP to the requesting router.
>
> and isis retransmit-interval?
>
>
> Usage Guidelines
>
>
> The setting of the seconds argument should be conservative, or needless
> retransmission will result.
>
> This command has no effect on LAN (multipoint) interfaces. On
> point-to-point
> links, the value can be increased to enhance network stability.
>
> Retransmissions occur only when LSPs are dropped. So setting the seconds
> argument to a higher value has little effect on reconvergence. The more
> neighbors routers have, and the more paths over which LSPs can be flooded,
> the higher this value can be made.
>
> The value should be higher for serial lines.
>
>
> Examples
>
>
> The following example configures serial interface 0 for retransmission of
> IS-IS LSP, every 60 seconds for a large serial line:
>
> interface serial 0
> isis retransmit-interval 60
>
>
>
>
>
>
>
>
> Regards Splinter
>
>
>
>
> On Sun, Jul 12, 2009 at 8:59 AM, Vinu <vinupeter_at_gmail.com> wrote:
>
> Thanks Rin,
>
>
>
> i guess we can live with it if convergence time is not a constraint... and
> i
> guess increasing the lsp MTU also will reduce number of LSP packets. in the
> Link... Even though have never worked on real life ISIS network :-(
>
>
>
>
>
>
>
> On Sun, Jul 12, 2009 at 10:32 AM, Rin <rintrum_at_gmail.com> wrote:
>
> Hi Vinu,
>
>
>
> The command lsp-gen-interval 120 will increase the latency between
> consecutive LSP generations. So if we consider in an fix amount of time,
> the
> LSP exchanged will be less. However, this will reduce the convergence time
> of the network. Thus, I'd not use this command for this requirement.
>
> Rin.
>
>
>
> _____
>
> From: Vinu [mailto:vinupeter_at_gmail.com]
> Sent: Sunday, July 12, 2009 12:44 PM
> To: Con Spathas
> Cc: Rin; Splinter; Cisco certification
> Subject: Re: ISIS LSP
>
>
>
> i guess you'll need to add
>
>
>
> # lsp-gen-interval 120 (it's maximum value in seconds)
>
> On Sun, Jul 12, 2009 at 7:00 AM, Con Spathas <ccie19226_at_googlemail.com>
> wrote:
>
> I'd concur with that.
>
> I've seen those settings in the IS-IS Network Design Solutions book by
> Martey/Sturges as well as some DocCD doco...
> For example:
>
> http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/isfscbp_ps63
> 50_TSD_Products_Configuration_Guide_Chapter.html#wp1055077<http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/isfscbp_ps63%0A50_TSD_Products_Configuration_Guide_Chapter.html#wp1055077>
>
>
> On Sun, Jul 12, 2009 at 2:45 AM, Rin<rintrum_at_gmail.com> wrote:
> > Hi Splinter,
> >
> > I would configure as below:
> > - specify only L1 or L2 LSP
> > - Change LSP Remaining Lifetime to maximum value: max-lsp-lifetime 65535
> > - Change LSP Refresh Interval to maximum value: lsp-refresh-interval
> 65000
> >
> > Just my thought, any other ideas?
> >
> > Rin
> >
> > -----Original Message-----
> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> > Splinter
> > Sent: Sunday, July 12, 2009 1:20 AM
> > To: Cisco certification
> > Subject: ISIS LSP
> >
> > Hi,
> >
> > I need to make sure that the least number of lsp packets are sent between
> > routers on a point to point ethernet segment.
> >
> >
> > Thank you
> >
> > Splinter
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
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>
>
>
>
>
>
>
>
>
> --
> Regards,
>
> Vinu Peter
>
> CCIE # 16439
>
>
>
>
>
> --
> Regards,
>
> Vinu Peter
>
>
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Received on Sun Jul 12 2009 - 17:53:25 ART