Subject: [Isis-wg] ISIS over NBMA

From: "Lakshminarayanan Rajamanickam" <[email-masked]>
Date: Tue, 24 Jul 2001 17:51:54 +0800

hi, 

1) How the ISIS treats NBMA networks? as a multi-access network or as a collection of point-to-point links or both ?

2) If the NBMA network is considered as a collection of logical p2p sub-interfaces (s0.1, s0.2, s0.3, ....) only then,
how the PDUs are exchanged over a physical interface(s0). In this case ISIS PDUs are need to be processed similar 
to point-to-point links ? or any parent-child relationship needs to be maintained between the sub-interfaces and 
the physical interface to track ?

3) In RFC-2973, ISIS Mesh Groups (page#4), 
How the numbered mesh groups are connected by "transit circuits" 

Let's consider a full-mesh topology with three routers A, B, C is divided in to two mesh groups 1 & 2 (full-mesh)

mesh group 1: A and B
mesh group 2: B and C

here B is the transit router whose both interfaces are 'meshset'
and if the interface link between A and C is 'meshblocked'
then where comes the transit interface ?

any response in this regard would be of great helpful 

thanks in advance,
lakshminarayan r