From: Ken (cciecn@xxxxxxxxx)
Date: Thu Feb 24 2000 - 18:21:31 GMT-3
The author is emphasizing that if you have an
virtual-link across the dial up line, and you use on
demand configuration on this interface, both and
virtual link and the non-virtual ospf link(remember
that you definitely already have an non-backbone area
across the dial up line, otherwise the virtual link is
meaningless), will be treated as demand routes.
Kent Yu
--- "kinton@oldmedia.com" <kinton@oldmedia.com> wrote:
> I think what the author is saying is that if you're
> running a virtual link over a circuit that only
> comes up on demand (such as ISDN), then the virtual
> link will keep the circuit up all the time unless
> you use the "ip ospf demand-circuit" command on the
> interface.
>
> This command will suppress period hellos and LSA
> refreshes from going out over the interface. These
> things would normally cause interface to be brought
> up.
>
> Kinton
>
>
> Original Message:
> -----------------
> This is from 'Routing TCP/IP, Vol 1, Jeff Doyle',
> page 567:
>
> If OSPF over demand circuits is configured and a
> virtual link is configured to cross the demand
> circuit, the virtual link will also be treated as a
> demand circuit. Otherwise, the virtual link traffic
> would keep the circuit up.
>
> I don't understand this paragraph, especially the
> 'Otherwise' part. What does the author want to tell
> us? Do we need to do some special configure on this
> situation?
>
> Michael
>
>
>
>
>
>
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