WUGS Software

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WUGS Software

• An Introduction to GBNSC and Jammer

2
Gigabit Switch Software Interfaces

• Software completely separate from switch.
• No processing engine on the switch

3
WUGS Software

• GBNSC (GigaBit Network Switch Controller)
• Jammer
• Simplified over the years by removing about 25K
  lines of code
• 135,100 lines of C code !!!
• GBNSC (21000)Jammer(15300)lib(46000)
• NodeSim(2800)CMAP(25000)CM(25000)
• NetBSD platform
• Fore Systems adapter and driver - Solaris

4
Software Overview
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GBNSC

• Monitor one WUGS
• Hide Hardware details as much as possible from
  layers above
• Provide access of all hardware details to Jammer
• Monitor state of the switch
• Event Driven

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GBNSC Components
NCCP Node Control Communication Protocol CMSS
Core Connection Management Software System NCMO
Node Controller Managed Object
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Contd

• NCCP is responsible for communicating with CMSS
  parent and jammer.
• NCMO state is the connection-oriented view of the
  switch that is provided to CMSS parent.
• Switch control is responsible for switch
  initialization, keeping track of requestee
  operation and of the current hardware state.
• The CellManager is responsible for communications
  with the switch via ATM card and reserves control
  connections that the switch controller will use.

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GBNSC Configuration File

• Specifies information needed about other end of
  the links for Connection Management to operate
• Specifies the control interface for the switch
• Allows for override of some default switch
  configurations.

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Contd

• GBNSC.apic for NetBSD
• Problem with the size of the socket buffer for
  the RATM socket used by GBNSC !
• GBNSC.apic -a -b64000 config.apic
• -a tells GBNSC to use APIC
• The -b64000 sets the socket buffer size for the
  RATM socket to be 64000 bytes.

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NCCP Interface with Jammer

• Interactions with the Jammer are strictly
  Request/Response with Jammer initiating the
  request
• When GBNSC receives a Request message it creates
  a requestee object to process it.
• After the processing is done, a Response is sent
  back to Jammer.

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Jammer

• Interactive script language interpreter
• Complete access to all the bits in the switch
  tables and registers.
• Allows for testing error conditions in the
  switch.
• Supports iterative and repeated tests.

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Communication Structure
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The Actual Language

• Loose adaptation of C and Shell language
  syntaxes.
• Contains negation, conditional, comparision
  operators etc
• The file extension .js is typically used for
  Jammer scripts.
• Part relevant to the exercises.

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What are we going to use ??

• PING (Switch Controller / Module)
• Ping SC the message goes to the switch
  controller and immediately back to Jammer.
• Ping SM the switch controller sends a test cell
  through the switch and returns the result of the
  test cell.

15
Contd

• Reset SC / SM
• QUIT
• get cells
• get cells virtual_path virtual_circuit cell_count
  timeout repeat_count offset data
• put cells
• put cells virtual_path virtual_circuit cell_count
  repeat_count offset data

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Get Cells

• Cell_count no of cells to put or get
• Timeout-length of time in sec that get waits
  before reporting a failure
• Offset-offset into the payload where data pattern
  begins
• Repeat_count-number of times the data pattern is
  repeated in the cell payload
• Data-comma-delimited list of integers specifying
  the data pattern in the payload.
• Get cells 0 100 2 5 4 2 0x19 0x10
• Will wait for no more than 5 seconds for two
  cells on VPI0 and VCI100. The payload of these
  cells must be (in hex) 00 00 19 10 19 10 19 10 19
  10 00 00.

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Commands Contd

• Write vcxt port virtual_circuit_entry parameters
• write vpxt port virtual_path_entry parameters
• write mr port field parameters
• Typically a connection is established with the
  above three operations. The MREG must be written
  in order to enable cell flow thru the switch . (
  SLE flag is set to 1 )

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VXT and MREG parameters

• Write vcxt 3 200 1 2 1 0 0 0 210..4 0
• This instruction writes to entry 200(VCI) of the
  VCT for input port 3.The cells are sent to output
  port 4 and leave the switch on virtual circuit
  210.
• Write mr 3 2 . 32..1
• Software link enable(SLE) 1 RCBDT 32 to
  relieve congestion.

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Configuring The WUGS-20

• Logon to the Server running NetBSD in our lab the
  host name is UT105193.ni.utoledo.edu
• /usr/wugs/bin/FreeBSD should be in your search
  path
• On The Prompt give the command
  NodeSim-fconfig-ppeer_file
• the path for this should be usr/wugs/src/NodeSim/C
  ONFIGS

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Configuration Contd

• On the Prompt give the command
  GBNSC-sut105193-p4550config.port0
• the path for this should be /usr/wugs/src/GBNSC/CO
  NFIGS
• At your home directory give the command
• Jammer0.1 ut105193 portno
• Currently 3552 is the port specified in
  config.apic
• Ping sc and Ping sm

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Configuration Contd

• Write your Jammer Program and store it as .js
  file and this file can be included in current
  directory by command
• include filename.js
• this will execute the commands in the script

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Experiment - 1

• Direct Loop Back Connection

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Experiment - 2

• Simple Loop Back Connection

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Data Transfer from one host to another host
SERVER
UT105193
Wugs-20
PORT 5
PORT 6

• UT105194

CLIENT
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Steps Involved In The Experiment

• Run The SW_CON File
• Activates the Switch Controller
• Run The SW_JAM File
• Activates the Jammer
• Write The Jammer Script

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Jammer File For This Experiment

• write vcxt 5 200 1 2 1 0 0 1 0 0 0 0 0 0 0 50 0 0
  0 0 6 0
• write vpxt 5 0 1 2 1 0 0 1 0 0 0 0 0 0 0 50 0 0 0
  0 6 0
• write mr 5 2 0 128 32 0 256 1 1 1 1 100000 0
• write vcxt 6 200 1 2 1 0 0 1 0 0 0 0 0 0 0 50 0 0
  0 0 5 0
• write vpxt 6 0 1 2 1 0 0 1 0 0 0 0 0 0 0 50 0 0 0
  0 5 0
• write mr 6 2 0 128 32 0 256 1 1 1 1 100000 0

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Whats That File About

• write vpcxt targetport inputchannel bi rc d
  cyc1 cyc2 cs ud1 ud2 sc vpt rco br
• vpi1 vci1 bdi1 vci2 vpi2 bdi2 port1 port2
• target port Port whose entries are to be made
• input channel the input channel on which for
  which the entries are written
• bi to differentiate between busy and idle cell
  slots
• rc 010 sends to addr1, 001 sends to addr2
• d this determines whether you are sending data
  or control cells
• cyc1 if a cyc bit is set then the cells
  received on that IPP are forwarded to the next
  address port and not sent to the OPP
• cs this bit gives the cell priority
• ud multi-point connections

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Contd

• Vpt this bit being set indicates that the
  connection is a virtual channel and that another
  (channel) table lookup should be made
• vpi1 this is the output path for addr1
• vci1 this is the output channel for addr1
• bdi bdi fields may only be enabled when the ATM
  transfer mode is AAL5
• port1 one of the ports to which cells may be
  sent

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General Remarks

• Include read commands after each write to check
  the contents of the VPT, VCT or Mreg you have
  written .
• Use quit to exit Jammer and Ctrl-C to exit GBNSC.
  Be sure to exit in the reverse order of
  initiation.
• Remote login as group1, group2. No Password.
• Ut105193.ni.utoledo.edu lt-gt WUGS port 5
• 194 port 6 195 port 7. SPC on port 7.

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Any problem !!

• ONLY RESET THE SWITCH WHEN IT IS REALLY NECESSARY
  !!!
• Go to the website for tons of material.
• http//www.arl.wustl.edu/projects/gigabitkits
• Handouts

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• THANK YOU