Subject: Re: simulation of Q-OSPF

From: Paul Stirpe <[email-masked]>
Date: Fri, 25 Jul 1997 11:24:59 -0400

Just to inject some additional information into this discussion, we are
starting to use OPNET for construction of
some other IP Multicast routing protocols (PIM) and I think it is worth
mentioning that OPNET beta version 3.5
has native support of OSPF. We are just now in the process of understanding
how to build IP Multicast routing
using OPNET's version of OSPF.  FYI,
Paul A. Stirpe
Reuters
---------------------- Forwarded by Paul Stirpe on 07/25/97 11:10 AM
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 image moved   K.Carlberg @ cs.ucl.ac.uk                          
 to file:      07/25/97 10:20 AM                                  
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Please respond to [email-masked]

To:   mpullen @ bacon.gmu.edu
cc:   qosr @ ca.newbridge.com (bcc: Paul Stirpe)
Subject:  Re: simulation of Q-OSPF

Mark,
> At present, we do not include a factor for the compute time
> to calculate the routing, etc.  But we actually DO the routing
> calculations, and have time them.  They are typically under 50ms
> on a Sparc20 for our  test network (almost 100 nodes).
Its been a while since I've played with Opnet, but at that time
it did not support OSPF. So I'm curious as to whether you have
built the FSM models to support OSPF, or are you doing some
amount of abstraction (ie, supporting a just subset of LSAs) and
using Opnet function routines to perform Dykstra calculations?
Also, is the 50ms number applied to {shortest hop + 1 foo metric}
(where foo can be bandwidth or delay or...)?  And is your set of
100 nodes within 1 area, or have you subdivided this into several
areas?
thanks,
-ken

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From: Mark Pullen <[email-masked]>
Date: Fri, 25 Jul 1997 14:32:54 -0400 (EDT)

We have built an OSPF model.  However, I haev heard OPNET recently 
came out with an OSPF model; if so we will want to try to incorporate
their model rather than continue with our own.  We would try
to do this sometime in the Fall.

The 50ms number is the longest time we have observed (out of many times)
for the QOSPF Dijkstra computation- includes the QOS metrics.  The set
of nodes is partitioned into 4 areas (the simulation would not have
been interesting otherwise, we wnated to see how QOSPF would work
in the area case.) 

Mark

> From [email-masked] Fri Jul 25 10:24 EDT 1997
> To: Mark Pullen <[email-masked]>
> cc: [email-masked]
> Mime-Version: 1.0
> Date: Fri, 25 Jul 1997 15:20:27 +0100
> From: Kenneth CARLBERG <[email-masked]>
> 
> Mark,
>