From: George Yiannibas (hintgy@hotmail.com)
Date: Mon Jan 19 2004 - 10:48:53 GMT-3
There is another twist in this scenario. What if you are NOT allowed to use
point-to-point interfaces in a hub and spoke IS-IS over FR ? You can do it
by using tunnel interfaces. If anyone is interested I have labed this and I
have the configurations saved.
HTH
George
>From: "Scott Morris" <swm@emanon.com>
>Reply-To: "Scott Morris" <swm@emanon.com>
>To: "'Hossam'" <sam6626@yahoo.com>, "'Yasser Abdullah'"
><yasser@alharbitelecom.com>, "'Bob Sinclair'" <bsin@cox.net>,
><ccielab@groupstudy.com>
>Subject: RE: ISIS over NMBA
>Date: Sat, 17 Jan 2004 06:23:55 -0500
>
>You can work it in the LAN method as well... But it will depend on your
>L1/L2 arrangements. Just make sure your hub router is the DIS. The same
>document talks about this as well.
>
>
>Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
>JNCIS, et al.
>IPExpert CCIE Program Manager
>IPExpert Sr. Technical Instructor
>swm@emanon.com/smorris@ipexpert.net
>http://www.ipexpert.net
>
>
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Hossam
>Sent: Saturday, January 17, 2004 6:10 AM
>To: Yasser Abdullah; 'Bob Sinclair'; ccielab@groupstudy.com
>Subject: RE: ISIS over NMBA
>
>Yasser,
>What happens with you is correct. ISIS does't support HUB and Spoke
>Topology. For ISIS to work correctly over NMBA networks you need a FULL
>mesh.
>
>Other wise u go for a point-point mode.
>
>
>http://www.cisco.com/en/US/tech/tk365/tk381/technologies_tech_note09186a0080
>09445a.shtml
>
>Thanks
>SAM
>Yasser Abdullah <yasser@alharbitelecom.com> wrote:
>
>I was testing ISIS over FR HUB & 3 spokes. Spokes are adjacent only with
>the
>hub and can see the routes advertised by the hub (I can't see other spokes
>in the IS neighbors table). The hub is also the DIS and has all routes in
>its routing table.
>
>The problem is routes advertised by spokes are in the db of other spokes
>but
>not in the routing table. Every time I reset the ISIS process, the routes
>will appear for a few seconds and then disappears.
>
>I tried debugging but could not see any errors. I changed it to a full mesh
>topology and it works fine.
>
>Is this an expected behavior? why are the routes in the DB but not the RT ?
>
>Thank,
>
>Yasser
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Bob
>Sinclair
>Sent: Friday, January 16, 2004 6:30 PM
>To: Hossam; ccielab@groupstudy.com
>Subject: Re: ISIS over NMBA
>
>Hossam,
>
>You are right on regarding ISIS over Frame-Relay. All routers need to form
>adjacencies with all others on the link, and this cannot happen between
>spokes. So normally you will want to use P-P subinterfaces, or Multipoint
>with a single neighbor.
>
>You might be able to get a multipoint hub to work, if the spokes are
>different circuit types: what if the hub is L1/L2, one spoke is L1 and the
>other spoke is L2? Then the spokes would not need an adjacency.
>hmmmm..
>
>Bob Sinclair
>CCIE #10427, CISSP, MCSE
>www.netmasterclass.net
>
>
>----- Original Message -----
>From: "Hossam"
>To:
>Sent: Friday, January 16, 2004 9:13 AM
>Subject: ISIS over NMBA
>
>
> > Guys,
> > Theoriticaly, i know that the ISIS has only two supported network
>types
>"Point - Point" and Broadcast Multiple Access. I know we need to go for
>the
>point to point option with all FR interfaces.
> >
> > But i tried configuring ISIS over NMBA (Point to multipoint FR
>interface)
>over a link between two routers only. And it worked fine. CNLS neihbour
>were
>up. Routing tables looked ok.
> >
> > So i thought i have to take one step further and try ISIS over NMBA
>with a
>HUB and two spokes. Strangly, the CLNS neighbors were up between the
>three
>routers. The HUB routing table was ok too. But the spokes did't have the
>full routing table.
> >
> > I think this is realated to that ISIS unlike OSPF needs to build up
>links
>between all routers over the Multiple access network and NOT only the
>Designated router. I think if i went to a FULL Mesh instead of HUB and
>spoke
>it will work? is't it??
> >
> > Is my understanding ok?? do i miss anything?
> > Is there any turn arrounds to get the ISIS over a HUB and spoke layout
>over NMBA to work??
> >
> >
> > Thanks
> > SAM
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