From: Bob Sinclair (bsin@cox.net)
Date: Fri Jan 16 2004 - 12:30:15 GMT-3
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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