From: Shamin (ccie.xpert@gmail.com)
Date: Wed Aug 22 2007 - 02:23:27 ART
Hi,
Thanks for the reply.
I have read that from the Command reference as follows for "Ip ospf
demand-circuit"
"Periodic hello messages are suppressed and periodic refreshes of link-state
advertisements (LSAs) do not flood the demand circuit. This command allows
the underlying data link layer to be closed when the topology is stable. In
point-to-multipoint topology, only the multipoint end must configured with
this command."
So as i understand from the above, "ip ospf demand-circuit" command can also
be applied ,
if the requirement is to reduce the LSA refresh every 30mins. I have
observed the "Donot Age LSA entry in the " show ip ospf int " output for
interfaces enabled with "ip ospf demand circuit".
It will be helpful if any of the experts in the group can clarify the
difference in the commands.
Regards
Shamin
On 8/21/07, eicc tester <reto_ccie@yahoo.com> wrote:
>
> 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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