From: Robert Massiache (robert2140@hotmail.com)
Date: Mon Nov 18 2002 - 19:08:16 GMT-3
> > If a network topology like below:
> >
> > Area 0---Area 10---Area 20--Area 30
This design is has to be re-structured. You can not have your area 30 trying
to connect to area 0 using a virtual link or the virtual link can't have 2
transit areas.
You can't have an area (area 30) physically connected to another 'area'(area
20) which is already served by a virtual link. IMHO...It is considered to be
a bad design.
Solutions:
1. Consider redesigning it and have area 30 physically connected to area
10(like area 20).
2. Have two different and discontinuous parts of area 0 and connect them
through virtual links. Now you have the comfort of placing area 30 next to
one of the discontinueous area 0.
3. Use GRE tunnel to connect the remote ends, now you will form adj. No vir
links needed. (beware it causes overhead)
Ref:
OSPF Design Guide by Sam Halabi
http://www.cisco.com/warp/public/104/ospfdb7.html
http://www.cisco.com/warp/public/104/2.html#8.0
thanks
Robert M
CCIE #
>From: "Bob Rech" <brech@kc.rr.com>
>Reply-To: "Bob Rech" <brech@kc.rr.com>
>To: "Bashir Sulaiman" <bashir.sulaiman@netwise.co.uk>, "'Tasuka
>Amano Hsu'" <tasuka@mac.com>, "'ccielab Groupstudy'"
><ccielab@groupstudy.com>
>Subject: Re: OSPF Virtual link cross Multi area
>Date: Mon, 18 Nov 2002 11:46:14 -0600
>
>To make this work is ugly.
>But having said that you can create
>On the area 0 and area 10 routers
>area 10 virtual-link <neighbor ospf ID>
>On the area 10 and area 20 routers
>area 20 virtual-link <neighbor ospf ID>
>I did just put this together and the routes from area0 and area 30 do get
>propagated all the way across. This is kind of like a vitual area through
>another virtual area, I am not sure if this is a supported configuration,
>but it appears work. All the virtual links come to FULL and all routers
>show
>an interface in area 0.
>
>----- Original Message -----
>From: "Bashir Sulaiman" <bashir.sulaiman@netwise.co.uk>
>To: "'Tasuka Amano Hsu'" <tasuka@mac.com>; "'ccielab Groupstudy'"
><ccielab@groupstudy.com>
>Sent: Monday, November 18, 2002 9:54 AM
>Subject: RE: OSPF Virtual link cross Multi area
>
>
> > Tasuka,
> >
> > As long as you have a valid virtual-link to area 0 from area 20, then
>you
> > can "virtual-link" to the area 20 router with the link to area 0.
> > Any contrary views?
> >
> > Bashir
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Tasuka Amano Hsu
> > Sent: 18 November 2002 13:42
> > To: ccielab Groupstudy
> > Subject: OSPF Virtual link cross Multi area
> >
> > If a network topology like below:
> >
> > Area 0---Area 10---Area 20--Area 30
> >
> > How to make the virtual linke from Area 30 to connect to Area 0
> >
> > And I could make a virtual link for area 20 to through area 10 to
> > connect to area 0 but how about area 30 ?
> >
> > Best Regards
> >
> > Tasuka
This archive was generated by hypermail 2.1.4 : Tue Dec 03 2002 - 07:23:05 GMT-3