From: tom cheung (tkc9789@xxxxxxxxxxx)
Date: Mon Feb 04 2002 - 12:17:40 GMT-3
Steve,
Brian Dennis explained clearly this a while back. Following is extracted
from his e-mail:
"The issue with ISIS over frame-relay is with a point-to-point subinterface
to a multipoint subinterface or to a physical interface.
I just retested all this in my lab and confirmed what works and what doesn't
work.
Works:
1. point-to-point subinterface to a point-to-point subinterface
2. physical interface to a physical interface
3. mulitpoint subinterface to a multipoint subinterface
4. multipoint subinterface to a physical interface
Doesn't work:
1. point-to-point subinterface to a physical interface
2. point-to-point subinterface to a multipoint subinterface
Basically the issue is with point-to-point interfaces sending point-to-point
IIH's (ISIS hellos) and multipoint or physical interfaces sending LAN IIH's.
There isn't a way to change the hello types.
Also remember that if you're going to run ISIS over frame relay on a
multipoint subinterface or a physical interface you'll need to map clns to
the dlci."
HTH
Tom
>From: "Steven Weber" <itweber@earthlink.net>
>Reply-To: "Steven Weber" <itweber@earthlink.net>
>To: <Yves@Fauser.de>
>CC: <ccielab@groupstudy.com>, <nobody@groupstudy.com>
>Subject: Re: IS-IS over MBNA.....
>Date: Mon, 4 Feb 2002 08:49:42 -0500
>
>This link provides a wonderful explanation. Thank You. However, there are
>still a few points that I'm unclear on. How do you know that there is a TTL
>bit and how do you know that it is set to 1. Also, the reason Doyle says
>that it doesn't work is because a multipoint interface is treated like a
>LAN
>interface and a point-to-point interface is treated like a point-to-point
>link. IS-IS doesn't have a network command like OSPF does in order to
>change
>this. Therefore the link on both ends must be the same. So according to
>this, a hub which is multipoint with spokes that are point-to-point will
>not
>work but if the interface types on both ends match there should be no
>problems. But there are........
>
>Regards,
>Steve
>----- Original Message -----
>From: <Yves@Fauser.de>
>To: "Steven Weber" <itweber@earthlink.net>
>Cc: <ccielab@groupstudy.com>; <nobody@groupstudy.com>
>Sent: Monday, February 04, 2002 8:04 AM
>Subject: Re: IS-IS over MBNA.....
>
>
> > Hi Steve,
> >
> > we had a discussion about that some time ago, maybe this helps :
> >
> > http://www.groupstudy.com/archives/ccielab/200108/msg00763.html
> >
> > Yves
> >
> >
> >
> >
> >
> > "Steven Weber" <itweber@earthlink.net>
> > Sent by: nobody@groupstudy.com
> > 04.02.2002 04:14
> > Please respond to "Steven Weber"
> >
> >
> > To: <ccielab@groupstudy.com>
> > cc:
> > Subject: IS-IS over MBNA.....
> >
> >
> > I was going through Doyle Vol. I and when I got to IS-IS over MBNA he
>says
> > that unlike OSPF you cannot change the network types on a frame relay
> > interface. Therefore they all must use the same interface types. However
> > when
> > I tried this I only had success with point-to-point like Doyle suggests.
> > When
> > I try to use the physical interface on the hub and spokes or use
> > multipoint on
> > hub and spokes the adjacencies never form. Would someone please be able
> > to
> > explain to me why it only works when you use point-to-point and not
> > multipoint
> > or physical interfaces.
> > Regards,
> > Steve
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