Anton,

Along these same lines there is also:

http://www.ietf.org/internet-drafts/draft-ietf-isis-igp-p2p-over-lan-00.txt

Of course, to hide the network completely you have to treat the ethernet
as an unnumbered point-to-point interface.

Anton Smirnov wrote:
> Markus,
> if I understood correctly, by 'hiding' the network you mean announcing it
> in a way that all non connected routers know about the link and may use it
> for transit traffic but are not aware of addressing associated with the
> network.
> If above is correct then it is very easy to achieve. Just announce this
> broadcast link in type-1 LSAs of both connected routers as type-1 link (you
> wrote there are two routers on the link, right?). This change is seamless
> for all non-connected routers. For connected routers it will require minor
> changes in LSA origination code and, may be, in SPF code to calculate
> correctly next hop information.
>
> Couple of years ago I played with this mechanism to achieve LSDB size
> reduction for networks actively using broadcast media to interconnect two
> routers (say, Ethernet crossover connections between routers). Goal was
> different from what you are trying to achieve, because accent was on
> autoconfiguration of the feature without involving much additional
> signaling, and transit network addressing was still announced. But I
> remember that actual code changes for this feature were very minimal. That
> time I half-wrote a paper about this mechanism. If you are interested I can
> find it, though I don't think it is of much help for your task.
>
> Anton
>
>
> ----- Original Message -----
> From: "Markus Prison" <mprisonGIGA-STREAM.DE>
> To: <OSPFDISCUSS.MICROSOFT.COM>
> Sent: Friday, April 26, 2002 16:11
> Subject: [OSPF] AW: Hide a network between two routers
>
>
>
>>Hi Acee,
>>
>>it will be a single broadcast network betweeen this two routers.
>>For ther routers around them it should look that there is no network
>>
> between
>
>>them.
>>
>>What do you meen with tunnel?
>>
>>Markus
>>
>>-----Ursprungliche Nachricht-----
>>Von: Mailing List [mailto:OSPFDISCUSS.MICROSOFT.COM]Im Auftrag von Acee
>>Lindem
>>Gesendet: Freitag, 26. April 2002 15:55
>>An: OSPFDISCUSS.MICROSOFT.COM
>>Betreff: Re: Hide a network between two routers
>>
>>
>>Markus Prison wrote:
>>
>>>Hi people,
>>>
>>>my question will be if it's possible to hide a network between two
>>>
> routers
>
>>>for the routers that are connected to them within the ospf standard.
>>>
>>What do you mean by hide - is it a single network? The simple answer would
>>be to configure a tunnel between the two routers and run OSPF over the
>>tunnel rather than the physical network you are trying to hide.
>>
>>
>>>When it's not possible what do you suggest what changes i must do in my
>>>ospf code of the two routers.
>>>
>>>
>>>
>>
>>--
>>Acee
>>
>>
>

--
Acee

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