From: Andrew Bratchell (a.bratchell@caeuk.com)
Date: Mon Nov 04 2002 - 14:06:14 GMT-3
Banlan,
IS-IS is much easier to work with when using point to point interfaces over Frame-Relay.
You don't have to use point-to-point interfaces however if you don't want to.
You can use multipoint if you want to.
To do this you need to use the frame-relay map clns xxx broadcast where xxx is the local DLCI.
You may find that results using multipoint interfaces are variable.
Lot's of people have had problems getting ISIS to work this way.
Cisco recommends using point to point interfaces.
If you mix point-to-point with multipoint, IS-IS will not work.
IS-IS does not have the network types like OSPF to resolve these types of issues.
For more info refer to www.cisco.com/warp/public/97/isis-frint.html
Andy
-----Original Message-----
From: Ron [mailto:id353@singnet.com.sg]
Sent: 04 November 2002 16:45
To: Banlan Chen; ccielab@groupstudy.com
Subject: Re: ISIS over NBMA
Hi Banlan,
In an IS-IS NBMA environment, all routers must be connected in a point-to-point method. Unfortunately, IS-IS doesn't have much flexibilites when it comes to defining the state of the interface ("ip ospf network" command).
There are 2 types of hellos in an IS-IS network, LAN Hellos and point-to-point hellos. If your hub's FR configuration is in multipoint or the physical interface (defaults to multipoint), then it will be sending L1 and L2 IS-IS LAN Hellos to the spokes which in return sends point-to-point IS-IS Hellos back to the hub. Adjacencies will not be formed.
The only way is to convert the hub to a point-to-point network and all will be well.
HTH.
Ron.
From Banlan Chen <banlan.chen@lycos.com> on 4 Nov 2002:
> Hi Group,
>
> A quick question about isis over NBMA. On the hub and spoke environment,
> is it must to configure hub router as DR like OSPF?
>
> Thanks in advance.
> Banlan
>
>
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