Your e-mail messages will be slightly edited before being posted here :-) Ljiljana. ******************************************************************************* From ballanty@sfu.ca Thu Jan 4 23:22:54 2001 From: Rob Ballantyne To: gripe@cs.sfu.ca CC: ljilja@cs.sfu.ca Subject: OPNet configuration for ENSC833 no env_db7.0 file Hi, The instructions to configure OPNet in step 5 say: > 5. cd op_admin > cp /usr/local-bell/opnet7/setup/env_db7.0 . > NOTE: Make sure that the user is the owner of "env_db7.0". > The file also needs correct permissions. > (Do "chmod 755 env_db7.0" if necessary.) There is no directory /usr/local-bell/opnet7/setup and hence no env file in it. I tried copying the one out of /usr/local-bell/opnet7/7.0.B/local/ but it didn't seem to work correctly because it didn't have the tutorial models. Thanks for any help! Rob ******************************************************************************* From owner-ensc833-g1@rm-rstar.sfu.ca Fri Jan 5 22:19:56 2001 From: Ljiljana Trajkovic Date: Fri, 5 Jan 2001 22:19:21 -0800 (PST) To: ensc833-g1@sfu.ca Subject: Running Opnet tutorials. Cc: gripe@cs.sfu.ca, ljilja@cs.sfu.ca Folks, We have updated the instructions how to set the the Opnet environment. Please check: http://www.ensc.sfu.ca/people/faculty/ljilja/ENSC833/#Labs Setting the environments: Opnet NS Ptolemy AutoClass Splus or go directly to: http://www.ensc.sfu.ca/people/faculty/ljilja/ENSC833/Labs/opnet_info.html http://www.ensc.sfu.ca/people/faculty/ljilja/ENSC833/Labs/env_db7.0.txt Please use the new "env_db7.0" file that contains Opnet libraries that you may need to run the tutorials and (later) your own models. Please note that you need to add the location YOUR OWN DIRECTORIES as first line(s) under the "mod_dirs" list in the "env_db7.0" file: For example, my own Opnet models will reside in: mod_dirs : /ensc/dept1/ljilja/op_models, (You may have several levels of your directories listed here.) To run the Opnet Online Tutorial, run "opnet" and pull down the Help menu in the upper right corner and select: Online Tutorial. Best wishes, Ljiljana ******************************************************************************* From David_Culley@pmc-sierra.com Tue Jan 9 21:17:08 2001 From: David Culley To: "'gripe@cs.sfu.ca'" Cc: "'ljilja@cs.sfu.ca'" Subject: Opnet tutorial too slow Hi, I was wondering if there is a location that I can copy the Opnet tutorial pdf's from to my local computer so that I can view them locally. Acro-read through exceed is painfully slow. Dave Culley ******************************************************************************* From StephenChan@sunflower.css.sfu.ca Wed Jan 10 14:16:20 2001 To: David Culley Cc: "'ljilja@cs.sfu.ca'" Subject: Re: Opnet tutorial too slow (#14130) David Culley, On Tuesday, 1/09/2001, you wrote Gripe: ******* Begin included message ********* Hi, I was wondering if there is a location that I can copy the Opnet tutorial pdf's from to my local computer so that I can view them locally. Acro-read through exceed is painfully slow. Dave Culley ******** End included message ********** Hello, You can copy the pdf files from the directory /net/local-bell/opnet7/7.0.B/doc/online/tutorial Cheers, Stephen Chan, Network Manager Network Support Group, Centre for Systems Science Room: ASB 10854, Phone: 291-4711, Fax: 291-5404 ******************************************************************************* From ktpang@sfu.ca Thu Feb 8 10:43:51 2001 From: Kwokcheong Pang Subject: Ethereal To: ljilja@cs.sfu.ca (Ljiljana Trajkovic) I find a very useful network protocol analyzer, called Ethereal, for Unix and Windows. Here is the brief description of the utility: "Ethereal is a free network protocol analyzer for Unix and Windows. It allows you to examine data from a live network or from a capture file on disk. You can interactively browse the capture data, viewing summary and detail information for each packet. Ethereal has several powerful features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session." For more information, please visit http://www.ethereal.com It is very easy to install. I strongly recommend us to have one install in our Engineering Lab machine. It can be downloaded from http://sunfreeware.com. Cheers, Thomas Pang (ENSC 833) ******************************************************************************* From wzhang@cs.sfu.ca Thu Feb 8 19:58:14 2001 From: "Wenbiao Zhang" To: "Ljiljana Trajkovic" Subject: RE: Etheral: A network protocol analyzer. Date: Thu, 8 Feb 2001 20:01:02 -0800 Hi, Ljiljana: Thanks. There is another free routing software at http://www.zebra.org/features.html, and several shareware for MPLS at http://www.mplsrc.com/vendor.shtml/ Cheers William ******************************************************************************* From: Milan Nikolic Subject: DS1 vs. T1 and STS-1 vs. OC-1 To: ensc833-g1@sfu.ca Folks, I got this e-mail from one of my mailing lists. Since some of you mix these terms (as quiz has proved), I am sure you'll be interested to read it. Best regards, Milan. ---------------------------------------------------------------------- >What is the difference between DS1 and T1? > >Thanks, >James DS1 is the digital signal, which includes framing bits as well as all the data (or voice) within the frames. DS1 does not include definitions for physical cabling, or line coding, etc. T1 is a superset of DS1 because T1 includes cabling, line coding, and digital signaling, etc.--basically everything that is necessary to get the signal from one end to the other. So talking about a "DS1 over a T1 line" is totally redundant since the term T1 includes definitions for DS1 framing. The reason for the distinction is that a DS1 can exist apart from a T1, but the reverse is not true. For instance, you can have a DS1 carried by a Sonet VT. In fact there are DS#'s that won't ever cross a cable. For instance, the DS2 in the process of multiplexing 28 DS1's into a DS3 has no physical cabling or line coding. On the other hand, if you have a T1, you are always carrying DS1 frames. This is also analogous to the STS-1 vs. OC-1 terminology. OC-1 always carries an STS-1 frame, and OC-1 covers all the physical layer specs including cabling. The STS-1 is just the digital signal, and can exist in electrical (within an optical switch) or optical (on the fiber) form. What is interesting is that European standards don't make this distinction. There is no term for just the digital signal of an E1. There is just an E1 and that's it. Also their version of Sonet (SDH), just has the name STM-n, where STM is the name for the frame as well as the cabling, etc. --Bernie ******************************************************************************* From nalborz@cs.sfu.ca Wed Feb 21 15:27:20 2001 From: "Nazy Alborz" To: msuma@sfu.ca, jchuang@sfu.ca, leetim@pmc-sierra.com, marion_sum@pmc-sierra.bc.ca Cc: ljilja@cs.sfu.ca, milan@cs.sfu.ca Subject: Help with Opnet Hi, I have a process model which takes in the name of the trace file together with the format of the data the trace file contains, and pushes it into other process models. I used it for running my leaky bucket model with the traffic trace. As a matter of fact this process model is a stand alone process model which is not used in any source node models. I believe that Opnet has an option in some of the traffic source models to get in the name of the file containing the traces. I'll do search on finding these source models and how they work and let you know as soon as I find out. Attached is the process model that I made. Pay attention to do the required changes to the my code, I mean changing the name of the trace file and format of the data. Hope it helps, Nazy ******************************************************************************* From nalborz@cs.sfu.ca Fri Feb 23 01:23:07 2001 To: ljilja@cs.sfu.ca, msuma@sfu.ca, jchuang@sfu.ca, leetim@pmc-sierra.com From: nalborz@cs.sfu.ca Cc: milan@cs.sfu.ca, nalborz@cs.sfu.ca Subject: Help with Opnet. Hi, Regarding your question about running trace driven simulations in Opnet, if you are planning to use Opnet's source nodes, there exists another way for reading in a trace file. In the source node models that use "bursty_gen" process model as their traffic generator process model (like ethernet_statin_adv node model), edit the attribute of the node model, go to the subattribute, "traffic generation parameters", then select the subattribute "packet generation arguments". In that window again choose the subattributes, "Interval time" or "packet size" or both of them depending on what attribute your trace file contains. Then in the "specify distribution attributes" window for the "distribution menu" choose the value "scripted". That will give you a window right below it to specify your trace file name. Note that this file should be in a directory that has already been specified in your environment file. Hope it helps, Nazy ******************************************************************************* From milan@cs.sfu.ca Tue Feb 27 23:43:17 2001 From: Milan Nikolic Subject: THANK U ALL - COLLECTIVE VIEWS ON CR: ATM layer corresponds to... To: ljilja@cs.sfu.ca ------------- Begin Forwarded Message ------------- From: NetBandi Subject: CR: THANK U ALL-COLLECTIVE VIEWS Date: Tue, 27 Feb 2001 18:19:05 -0800 X-Info1: submissions to comp.dcom.cell-relay or cell-relay@cell.onecall.net X-Info2: [Un]Subscribe requests to majordomo@cell.onecall.net X-Info3: example- unsubscribe cell-relay somebody@somewhere.com X-Info4: archives at http://cell.onecall.net ======================================================================================= ===== Hi all, Thank you for posting your views on whether "ATm corresponds to layer 2 or layer 3 of OSI." I've received varied opinions and obviously very good ones from the intellects and highly experienced in the industry. So, thought I should share this with you all and hence Iam posting all the collective responses. Thanks again for sharing.. Regards, Nagendra Bandi || || :||: :||: ::||:: ::||:: .:::||:::. .:::||:::. ...::::::||::::::. . . . ..:::::||::::::... cisco Systems Empowering the Internet Generation Nagendra Bandi nbandi@cisco.com ======================================================================================= ==== ORIGINAL POST: Hi all, Can anyone explain in simple terms as to whether ATM corresponds to layer 2 or layer 3 of OSI model. Thanks in advance. Bandi ======================================================================================= ==== ======================================================================================= ==== Resent-From: usenet@cell.onecall.net From: carlos@cisco.com Organization: Cisco Systems Bandi, ATM as a layer 2 or 3 protocol, based on OSI, has been a long time debate. ATM as a layer 2 can support protocols such as IP or IPX for the connectionless addressing. In similarity with IP or IPX, ATM has its own addressing scheme that can be used by upper layer protocols that supports the ATM reference model. So, in short, ATM can be positioned as a Layer 2 protocol like Ethernet or FDDI for the Data Link functionality or it can also support the addressing functionality that is needed in the layer 3. The use of the ATM addressing scheme is not readily practiced because its much too complex for the average network operators and takes up CPU and memory resources in the router if the ATM traffic is either SAR or tunneled through an IP network. So, IP + ATM are the current implementation or soon to be implemented because of the QoS (..and others features) that ATM provides and the ease of addressing that IP has provided over the years. My 2 cents, Carlos carlos@cisco.com --------------------------------------------------------------------------------------- ----- Resent-From: usenet@cell.onecall.net From:djanssen@cisco.com (David Janssens) Organization:Cisco Systems, Inc. Hi Bandi, Good question ;-) ATM doesn't really map very well to the OSI model - it is much better mapped to the B-ISDN model. You have to think of ATM as having two "planes": a Control plane and a Data plane. Data flows on established VC's and as such the Data plane corresponds to layer 2 of the OSI model. ATM is thus purely layer 2 when you're dealing with PVC's. But ATM also brings you the possibility to establish SVC's based on a dynamic routing and signalling protocol (PNNI) and it uses its own 20-byte NSAP addresses. It is the Control plane which allows you to establish these SVC's and this corresponds to the layer 3 of the OSI model. Regards, /david David Janssens .. .. Tel: +32 2 704 5621 djanssen@cisco.com || || Fax: +32 2 704 5800 Network Engineer || || Mail: Cisco Systems CCIE# 3151 |||| |||| Pegasus Parc Escalation Team .:||||||:..:||||||:. De Kleetlaan, 6 EMEA TAC cisco Systems, Inc 1831 Diegem, Belgium --------------------------------------------------------------------------------------- ----- Resent-From: usenet@cell.onecall.net From: David Organization: Cisco Systems Bandi, The ATM architecture is based on a logical model, called the ATM reference model, that describes the functionality it supports. In the ATM reference model the ATM physical layer corresponds approximately to the physical layer of the OSI reference model, and the ATM layer and ATM adaptation layer (AAL) are roughly analogous to the data link layer of the OSI reference model. Hope this helps.. <> David G. Wilson Solutions Area Manager - SouthEast PS Solutions Engineering Team http://wwwin.cisco.com/CustAdv/SM/ps/Set/ CCIE #4078 (Router/Switching) Cisco Systems Atlanta, GA. Office / VM (678) 352-2608 Home Office (770) 489-4562 Mobile (770) 335-7362 Isaiah 6.8 --------------------------------------------------------------------------------------- ------ Resent-From: usenet@cell.onecall.net From: Bernie Organization: Airnews.net! at Internet America Both. An ATM vcc is layer 2, whether or not it is an SVC, PVC, or SPVC. Now the protocol (Q.2931) that is used to setup and tear down SVCs and reroute SPVCs is a layer 3 protocol. This is where the concept of a multi-plane protocol stack comes from. The data plane of ATM is entirely layer 2, while the control plane is layers 2 through 3. If you don't understand this concept, find a good ATM reference guide or datacom book that spends some time explaining multi-plane networking. It is a difficult concept to understand, so I won't pretend to be able to explain it in the time I have available. --Bernie --------------------------------------------------------------------------------------- --- Resent-From: usenet@cell.onecall.net From:"Peter Mansell" If you read this Cisco article http://www.cisco.com/warp/public/614/12.html then you can see the issue is far from clear. I got this article from a www.google.com search for atm iso layer by the way. HTH --------------------------------------------------------------------------------------- ----- Resent-From: usenet@cell.onecall.net From:"Dooby" Organization: Excite@Home - The Leader in Broadband http://home.com/faster Figure 8-5: Relationship of ATM functional layers to the OSI reference model. Layer 1 and parts of Layer 2, the article is here. Hope this helps. http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2008.htm --------------------------------------------------------------------------------------- ---- Resent-From: usenet@cell.onecall.net From: "Andrew" Organization: Road Runner - NC ATM has nothing to do with layer 1. It's a layer 2 protocol whose control functions reside in layers 2 and 3. --------------------------------------------------------------------------------------- --- Resent-From: usenet@cell.onecall.net From: Francois Labreque Organization:Me? organized! You've got to be kidding! Layer 2 and below. However, it does use some layer3-like features such as making routing decisions when setting up VCs. -- Francois Labreque | //\\ Wear an ASCII ribbon! flabreque | || || @ | \\// Support the campain videotron.ca | \\ against HTML e-mail | //\\ and news! --------------------------------------------------------------------------------------- --- Resent-From: usenet@cell.onecall.net From: Udo Konstantin Organization:T-Online Hi Bandi, ATM corresponds to the physical layer and part of the data link layer of the OSI refernece model. ATM refernece model is composed of the following ATM layers. -physical layer -ATM layer (L2 OSI) ->combined with the adapation layer it is responsible for etablishing connections and passing cells through the ATM network -ATM adaption layer (L2 OSI)combined with the ATM layer the AAL is roughly analogous to the data link layer of the OSI referce model. More infos ?? buy Udo --------------------------------------------------------------------------------------- -- Resent-From: usenet@cell.onecall.net From:"Dominic Richens" Organization:Nortel Yes. It all depends on what you are using ATM for. IP networking people see ATM as just another layer 2 transport, maybe a smart layer 2 in that it can hide complex network topology from you and yet guarantee end-to-end QoS just the same. Applications that use ATM natively see ATM as both layer 2 and 3, since it has a networking layer supported by AESA, PNNI, etc... --------------------------------------------------------------------------------------- ----- Resent-From: usenet@cell.onecall.net From:meir@cisco.com Organization: Cisco Systems did you look at http://www.protocols.com//hot.htm http://www.cisco.com/univercd/cc/td/doc/product/atm/c8540/12_0/13_19/atg/index.htm Meir --------------------------------------------------------------------------------------- ----- Resent-From: usenet@cell.onecall.net From: Afroz Lateef There is not a true one-to-one mapping between ATM and OSI. ATM can correspond to Layer 2, and somewhat layer 3 too. Afroz Lateef --------------------------------------------------------------------------------------- ---- Resent-From: usenet@cell.onecall.net From:Veronica Tebbe 2. --------------------------------------------------------------------------------------- ---- Resent-From: usenet@cell.onecall.net From:chris@cisco.com Organization: Cisco Systems Bandi, ATM as a technology really more relates to layer 1 and 2. ATM does not deal with L3. That's what things like MPOA and MPLS can give you over an ATM transport. *** Cisco Confidential and Proprietary *** Chris L. McGugan Phone: +1 919.392.3226 Cisco Systems, Inc. Pager: +1 800.365.4578 Sr. Manager, Marketing IS BU FAX: +1 508.632.6450 7025 Kit Creek Road Cell: +1 919.349.0618 RTP, NC 27709 GSM: 011.44.8025.76052 Email: chris@cisco.com E-page: chris@epage.cisco.com Administrative Assistant: Jessica Loiacono (jmonroe) +1 919.392.2130 --------------------------------------------------------------------------------------- --- Resent-From: usenet@cell.onecall.net From: Jerald Shetty Organization: Cisco Systems Believe me, it is not Layer-3. You can say it is Layer-2, because it defines access mechanism in a layer below 3. RFC 1483 and 1577 simply define ways of mapping your Layer-3 address to Layer-2 ATM address(NSAPs and VCs). In the case of LANE ATM maps the MAC address to the NSAP address. Could you explain why you are confused about whether ATM is Layer-2 or 3? Jerry Jerald Shetty Phone: 408 527-9720 Cisco Systems Fax: 408 526-6951 Customer Support Engineer Pager: 800-365-4578 San Jose TAC Email: jshetty@cisco.com --------------------------------------------------------------------------------------- --- Resent-From: usenet@cell.onecall.net From: Prince A Jose layer 2 --------------------------------------------------------------------------------------- --- Resent-From: usenet@cell.onecall.net From:zshacham@cisco.com Hi, ATM is a layer 2 protocol (like Frame Relay). Over ATM you can carry IP (third layer protocol), or voice. Enjoy the attached doc. http://www.cisco.com/univercd/cc/td/doc/product/atm/c8540/12_0/13_19/atg/ Zvi Shacham Manager, Product Marketing CSE BU, Cisco Israel Hamelacha 32, Tel:+972-9-8927181 Sapir Industrial Zone Mobile: +972-54-971610 Netania South, 42504, Israel Fax: +972-9-8927223 --------------------------------------------------------------------------------------- ---- ======================================================================================= ==== Resent-From: usenet@cell.onecall.net From:NetBandi Organization: Cisco Systems So what do you think now ;-) || || :||: :||: ::||:: ::||:: .:::||:::. .:::||:::. ...::::::||::::::. . . . ..:::::||::::::... cisco Systems Empowering the Internet Generation Nagendra Bandi nbandi@cisco.com ======================================================================================= ====== THANK YOU ALL ======================================================================================= ====== ------------- End Forwarded Message ------------- *******************************************************************************