From: Shamin (ccie.xpert@gmail.com)
Date: Wed Aug 22 2007 - 11:14:16 ART
Scott,
Thank you for your clarification.
If you can clarify my original concern ,i will be grateful i.e when to use
" ip ospf demand-circuit " v/s " ip ospf flood reduction".
I know that, demand-circuit is used over p-t-p networks. But is the
functionality of the two commands the same when it comes
to reducing the LSA refresh. Furthermore, can " ip ospf flood reduction
command " be used on a demand circuit,
Thanks in advance
Regards
Shamin
On 8/22/07, Scott Morris <smorris@ipexpert.com> wrote:
>
> Per Appendix B of RFC 2328:
>
> "LSRefreshTime
> The maximum time between distinct originations of any particular
> LSA. If the LS age field of one of the router's self-originated
> LSAs reaches the value LSRefreshTime, a new instance of the LSA
> is originated, even though the contents of the LSA (apart from
> the LSA header) will be the same. The value of LSRefreshTime is
> set to 30 minutes."
>
> "MaxAge
> The maximum age that an LSA can attain. When an LSA's LS age
> field reaches MaxAge, it is reflooded in an attempt to flush the
> LSA from the routing domain (See Section 14). LSAs of age MaxAge
> are not used in the routing table calculation. The value of
> MaxAge is set to 1 hour."
>
> The re-flooding occurs at half of maxage (30 minutes).
>
> HTH,
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
> #153, CISSP, et al.
> CCSI/JNCI-M/JNCI-J
> VP - Technical Training - IPexpert, Inc.
> IPexpert Sr. Technical Instructor
>
> A Cisco Learning Partner - We Accept Learning Credits!
>
> smorris@ipexpert.com
>
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
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>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> subodh.rawat@wipro.com
> Sent: Wednesday, August 22, 2007 4:39 AM
> To: reto_ccie@yahoo.com; ccie.xpert@gmail.com; ccielab@groupstudy.com
> Subject: RE: IP ospf demand-circuit V/S IP ospf flood reduction ???
>
> Just to correct you: This refreshment of LSA takes place after 1 hour not
> 30
> minutes.
>
> Subodh
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> eicc
> tester
> Sent: Wednesday, August 22, 2007 4:38 AM
> To: Shamin; Cisco certification
> Subject: Re: IP ospf demand-circuit V/S IP ospf flood reduction ???
>
> Hi
>
> "ip ospf flood reduction" just avoid the refreshement of LSA every 30
> minutes.
>
> "ip ospf demand circuit" mean that a link which is under an OSPF area ,
> don,t send OSPF hello packet all the time. This avoid the fact of bring
> the
> circuit (probaly and dial or isdn) just for sent hello packet
> periodically,
> the neigbhor relations is still maintaned.
>
>
> Shamin <ccie.xpert@gmail.com> wrote:
> Hi All,
>
> Can any one tell me , when the commands "ip ospf flood reduction" is used
> over " ip ospf demand circuit" .
> I know that, "Ip ospf demand circuit is used in point to point
> connections.
> Does that mean, ip ospf flood reduction"
> is used in Broadcast and NBMA OSPF networks. I am bit confused as to which
> command to apply in a particular scenario, mainly if the question asks to
> reduce the "paranoid updates" in ospf that occurs every 30mins.
>
> Thanks in advance.
>
> Regards
> Shamin
>
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