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, Id 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_ps635
0_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
>>> >
>>> > _______________________________________________________________________
>>> > Subscription information may be found at:
>>> > http://www.groupstudy.com/list/CCIELab.html
>>> >
>>> >
>>> > Blogs and organic groups at http://www.ccie.net
>>> >
>>> > _______________________________________________________________________
>>> > Subscription information may be found at:
>>> > http://www.groupstudy.com/list/CCIELab.html
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
>>> _______________________________________________________________________
>>> Subscription information may be found at:
>>> http://www.groupstudy.com/list/CCIELab.html
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> --
>>> Regards,
>>>
>>> Vinu Peter
>>>
>>> CCIE # 16439
>>>
>>
>>
>>
>> --
>> Regards,
>>
>> Vinu Peter

Blogs and organic groups at http://www.ccie.net
Received on Sun Jul 12 2009 - 11:11:55 ART