sorry for using the list but I get a bounceback from Howard's address.
Howard - received both your postings but my private reply to you was
returned with:
* * * * * * * *
The original message was received at Wed, 10 May 2000 20:57:20 -0700 (PDT)
from cr357136-a.flfrd1.on.wave.home.com [24.112.89.129]
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Kevin
----- Original Message -----
From: Kevin Wigle <[EMAIL PROTECTED]>
To: Howard C. Berkowitz <[EMAIL PROTECTED]>
Sent: Thursday, 11 May, 2000 00:02
Subject: Re: OSPF question- virtual links
> Howard,
>
> I got both of your postings.
>
> Kevin
>
> ----- Original Message -----
> From: Howard C. Berkowitz <[EMAIL PROTECTED]>
> To: Field, Brian <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
> Sent: Wednesday, 10 May, 2000 23:19
> Subject: RE: OSPF question- virtual links
>
>
> > In response to Brian Field,
> >
> > My replies to the list don't seem to be getting through, so Brian, if
> > you don't see this response on the list, feel free to repost it.
> >
> > Let me answer on two levels. First, this isn't a Cisco restriction,
> > but is the way the protocol was designed.
> >
> > Second, virtual links really aren't a great technology, so they
> > haven't gotten much enhancement.
> >
> > At a bit-fiddling level...
> >
> > >Two questions regarding virtual links:
> > >
> > >1) Why is it that each end point for a virtual link
> > >must be the router's Router ID value? Why is it not
> > >sufficient to terminate the virtual link on any of the
> > >target routers IP adresses or perhaps one of the router's
> > >IPs that are in the transit area?
> >
> > Without asking John Moy exactly what he had in mind when designing
> > virtual links, my impression would be that you need a stable router
> > ID as the originating router for the LSA. If you just used an
> > arbitrary IP address, it would probably break the LSA aging
> > mechanism, which is tied to advertising router.
> >
> > >
> > >2) Is it possible to establish a virtual link through
> > >an area which is a stub area? If not, why not?
> >
> >
> > No.
> >
> > At the bit level, stub areas are distinguished by not having the
> > transit-capable flag set. Virtual links are defined to go only
> > through transit areas.
> >
> > Also, here's my post for your other question, if it also doesn't get
> through.
> >
> > >In the ACRC book (page 200), the author shows the 10.64.0.1/24
> > >network being placed into an area 0 with the command:
> > >
> > > network 10.64.0.1 0.0.0.0 area 0
> > >
> > >Why is the wild card mask 0.0.0.0 used and not a mask
> > >which matches the actual manner in which the network
> > >has been subneted? Is there any difference to the operation
> > >of the router, area, OSPF, or area routing if the above was
> > >changed to:
> > >
> > > network 10.64.0.1 0.0.0.255 area 0
> > >
> > >?
> > >
> > >If the above two forms result in identical operation,
> > >why is the wild card mask required?
> > >
> > >Thanks,
> > >Brian
> > >
> >
> > By making the mask specific enough to match the router interface
> > only, it makes troubleshooting and maintenance easier. While it is
> > possible to have masks that meet multiple router interfaces, my
> > experience tells me that configurations are most clear if there is
> > 1:1 correspondence between network statements and OSPF-speaking
> > router interfaces.
> >
> > ___________________________________
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> >
>
>
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