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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 1 Network Simulation
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 2 Network Components Router/SwitchSwitch/Hub Client Computers Server
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 3 Simulation Goals To predict system behavior under various traffic loading conditions To evaluate failure performance To evaluate design options
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 4 Simple Laboratory LAN
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 5 Simulation Software - Comnet III Complete dynamic network simulation system Supplies frames/packets according to specified ransom distribution Simulates randomly distributed service times Records data and generates reports
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 6 Workspace
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 7 Toolbar
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 8 Insert Network Object
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 9 Define Properties
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 10 Edit Default Values
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 11 Expand Network
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 12 Add Sources and Responses
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 13 Edit Source Properties
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 14 Edit Multiconnect Properties
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 15 Edit Response Properties
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 16 Select Distribution Function
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 17 Select Report Items
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 18 Specify Simulation Parameters
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 19 Set Animation Parameters
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 20 Start Simulation
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 21 Read Simulation Report
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 22 Basic LAN with Sources
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 23 Preparing Subnet for Routing Delete server and server response Add network device - hub or switch
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 24 Deletion of Server and Source
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 25 Adding Hub/Switch
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 26 Selecting Switch Type
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 27 Updating Switch Parameters
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 28 Resulting Subnet Form
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 29 Creating the Top Level Add a server and response source Add a router Add link to server Add link to subnet Add subnet symbol (do not link yet!)
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 30 Resulting Top Level
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 31 Creating the Subnet Link Get copy of subnet on clipboard Descend into subnet from subnet symbol on top (router) level Intermodel Paste subnet to blank sheet Add access point and link to subnet switch Make router link to subnet Save all
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 32 Select Subnet for Capture
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 33 Selected Subnet
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 34 Put Copy in Clipboard
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 35 Adding the Subnet Link
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 36 Insert Subnet
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 37 Subnet with Access Point Added
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 38 Connect Subnet to Router
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 39 Selecting a Router
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 40 Selecting a Subnet Switch
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 41 Select Simulation Reports
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 42 Simulated Channel Utilization
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 43 Simulated Client Delays
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 44 Questions to Follow Up How can channel utilization be reduced? How can client delays be reduced? What are the effects of various choices of network components? What would be the effect of changing the network interconnections from 10BaseT to 100BaseT
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 45 Steps Expand the top level Expand each subnet –Subnet 1:5 computers –Subnet 2:14 computers –Subnet 3:8 computers Simulate all
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 46 Previous Subnet
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 47 Clone the Subnets
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 48 New Server Layer
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 49 Laboratory Subnet
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 50 Classroom Subnet
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 51 Classroom Computer Group
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 52 Editing Group Parameters
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 53 Computer Group Parameters
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 54 Laboratory Group Parameters
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 55 Lab Subnet Properties
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 56 Specify Link Properties
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 57 Channel Utilizations
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 58 Transit Delays
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 59 Increasing Link Speeds
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 60 100BaseT Utilization
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 61 100BaseT Transit Delays
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 62 Importing Topology and Traffic
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 63 Comnet Baseliner ™ Used to import topology –extracts node and link information –generates Comnet topology file Used to import traffic models –uses network analyzer output (Ethernet, Token Ring, FDDI ring or Point-to-point links) –transforms captured network traffic –provides load characteristics for Comnet
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 64 Supported Network Management Systems (NMS) HP OpenView IBM NetView for AIX Digital PolyCenter Castlerock SNMPc Cabletron SPECTRUM NAC Mind
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 65 Topology Import Steps Export topology from NMS (*.top, *.csv, *.ncb) Import topology via COMNET Baseliner
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 66 Importing Example Topology
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 67 Select File for Import
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 68 Define Topology File
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 69 View the Topology
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 70 Another Sample
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 71 Select Topology and Import
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12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 72 Result
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End 12/25/2015© 2008 Raymond P. Jefferis IIILect 12 - 73
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