From: Phil Boulo (pboulo@nc.rr.com)
Date: Fri Jan 16 2004 - 20:25:23 GMT-3
I believe the rule is point-to-point -> point-to-point or multi-point ->
multi-point
http://www.cisco.com/en/US/tech/tk365/tk381/technologies_tech_note09186a
008009445a.shtml
Regards
Phil
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Bob Sinclair
Sent: Friday, January 16, 2004 10:30 AM
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" <sam6626@yahoo.com>
To: <ccielab@groupstudy.com>
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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