From: Dale Kling (dalek77@gmail.com)
Date: Wed Jun 04 2008 - 09:57:25 ART
Thanks Narbik, now I have confident confirmation that is the only real
difference. I Guess if I get a question to suppress hellos and LSAs, I'll
use demand circuit, pending of course the layer 2 network I'm doing this
across.
Demand circuit only works on PTP and PTM networks correct? Broadcast
networks are a nono? I'm starting to get anal in my final two months before
the test, soaking up all the details I think a CCIE should know.
thanks,
Dale
On Wed, Jun 4, 2008 at 1:20 AM, Narbik Kocharians <narbikk@gmail.com> wrote:
> The "OSPF Flooding Reduction" and the "demand circuit" work by reducing
> unnecessary refreshing and flooding of already known and unchanged
> information with a difference:
>
> In OSPF demand circuit, hellos and the flooding of the LSAs are suppressed,
> whereas, in flood reduction, only the flooding of the LSAs are suppressed
> and NOT the hellos.
>
>
> On Tue, Jun 3, 2008 at 9:07 PM, Dale Kling <dalek77@gmail.com> wrote:
>
>> Ok I read in the DOCCD that ospf flood-reduction set the DONOTAGE bit, so
>> periodic 3600 sec refreshes don't happen.
>>
>> Now here's a paste from the DOCCD on demand-circuit, " With this feature,
>> periodic hellos are suppressed and the periodic refreshes of LSAs are not
>> flooded over the demand circuit." My question is don't the ospf routes
>> timeout on the other end after 3600 secs or does demand-circuit suspend
>> this
>> like flood-reduction?
>>
>> So it looks like OSPF flood reduction still tosses hellos around, while
>> demand-circuit does not. Are there more differences then this and what
>> would be a good case to differentiate between the two on a question?
>>
>> regards,
>>
>> Dale
>>
>>
>> _______________________________________________________________________
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>>
>
>
> --
> Narbik Kocharians
> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> www.Net-Workbooks.com
> Sr. Technical Instructor
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