*nix Documentation Project
·  Home
 +   man pages
·  Linux HOWTOs
·  FreeBSD Tips
·  *niX Forums

  man pages->Tru64 Unix man pages -> fddi_config (8)              



NAME    [Toc]    [Back]

       fddi_config  - Displays and modifies the Fiber Distributed
       Data Interface (FDDI) parameters

SYNOPSIS    [Toc]    [Back]

       /usr/sbin/fddi_config      -i      interface_name      [-c
       valid_counter_interval_time]   [-d]  [-l  link_error_monitor_threshold]
 [-p [1  |  0]]  [-r  restricted_token_timeout_time]
 [-t token_request_time] [-v valid_transmit_time]
       [-x [1 | 0]]

OPTIONS    [Toc]    [Back]

       Changes or displays the FDDI  characteristics  for  interface_name.
  You  must  provide interface name.  Determines
       how often the driver counters are  updated  by  the  DEFTA
       adapter.   The  default is 1 second.  Setting the interval
       time to zero (0) disables counter updates.  (For  the  fta
       FDDI interface only.)  Displays the FDDI interface parameters
 you can set.  Sets the error rate threshold  of  Link
       Error  Monitor  (LEM).   The  range for the LEM error rate
       threshold is an integer  power  of  10  from  1x10^-5  and
       1x10^-8.  The  default LEM threshold is 1x10^-8.  Sets the
       ring purger state for the  specified  FDDI  interface.   A
       value  of  1 enables the ring purger ability; a value of 0
       disables it.  Sets the Restricted Token Timeout parameter,
       defining how long a single restricted mode dialog can last
       before being terminated. The range for this  parameter  is
       from  0  to  10000 milliseconds. The default value is 1000
       milliseconds.   Sets  the  Request  Token  Rotation   Time
       (T_req)  for interface_name. T_req is used during the ring
       initialization process to negotiate a Target  Token  Rotation
  Time (TTRT) for the ring. The range for this parameter
 is from 4.0 milliseconds  to  167.77208  milliseconds.
       The  default  value  is  8.0 milliseconds.  Sets the Valid
       Transmission Time (TVX) timer for a specific  FDDI  interface.
 The range for the TVX timer is from 2.5 milliseconds
       to 5.2224 milliseconds. The default  is  2.6214  milliseconds.
   Enables  (1) or disables (0) full-duplex operation
       for the fta FDDI interface.  If the full-duplex  operation
       is  enabled,  the interface can be in one of the following
       states: Idle, Request, Confirm, or Operational.  (For  the
       fta FDDI interface only.)

DESCRIPTION    [Toc]    [Back]

       The  fddi_config  command  allows  you  to display all the
       parameters you can set for a specified FDDI interface  and
       to modify one or more parameters depending on your configuration
 requirements.  If  you  change  a  parameter,  all
       parameters,  including  unchanged  ones,  are displayed as
       confirmation. You must be superuser to use this command.

       Each FDDI interface  has  a  Media  Access  Control  (MAC)
       entity.  As  part  of  token  ring initialization, all MAC
       entities on the ring participate in a Claim Token  Process
       to  choose  a Target Token Rotation Time (TTRT) value.  In
       this process, each MAC entity bids their own  Request  TRT
       (T_req).  The  lowest T_req value is chosen as the Negotiated
 TRT (T_neg) or TTRT for the ring.  Use the netstat -I
       fza0  -s  command  to see the Requested TRT and Negotiated

       The TTRT value dictates an approximate, maximum delay  for
       the  token  to  make  a complete loop around the ring. The
       time it actually takes for a  token  to  complete  a  loop
       around  the ring is determined by the stations on the ring
       and whether or not the token is captured by a station.  If
       the difference between the time of the last passing of the
       token and the current time exceeds TTRT, stations  on  the
       ring may no longer capture the token.

       With  small TTRT values, stations cannot hold a token very
       long on its loop around the ring.  This  means  that  each
       station  can transmit only a small amount of data, but has
       the opportunity to capture the token more  frequently  and
       transmit data. With large TTRT values, stations can hold a
       token for a longer period of time, enabling them to transmit
  more  data  per token capture.  However, each station
       must wait a longer period of time to capture a token.   On
       a heavily loaded ring this might not be desirable.

       Each  MAC  entity also maintains a Valid Transmission Time
       (TVX) timer to recover from transient  ring  error  conditions.
  The TVX timer specifies the maximum amount of time
       that can elapse without receiving a valid frame or  nonrestricted
  token.  When  this timer expires, the MAC entity
       assumes that the ring is no longer operational and  initiates
 the Claim Token process to reinitialize the ring.

EXAMPLES    [Toc]    [Back]

       To show the parameters you can set for the fza0 interface,
       enter: fddi_config -i fza0 -d To change the TRT value  for
       the  fta0  interface to 10.2, enter: fddi_config -t10.2 -i
       fta0 To turn the ring purger off, enter: fddi_config -p  0
       -i mfa0

SEE ALSO    [Toc]    [Back]

       Files: fta(7), fza(7), mfa(7)

[ Back ]
 Similar pages
Name OS Title
lan_config Tru64 Modifies low-level configuration parameters for a given LAN interface
fddipciadmin HP-UX show PCI FDDI interface status, and/or change FDDI attributes
ifconfig Tru64 Configures or displays network interface parameters
dxkerneltuner Tru64 Modifies or displays kernel subsystem attributes
fza Tru64 DEFZA FDDI Network Interface
mfa Tru64 DEMFA FDDI Network Interface
faa Tru64 DEFAA FDDI Network Interface
jdbmod Tru64 Adds, modifies, or deletes data in the DHCP dynamic databases.
srconfig Tru64 Displays and controls source routing functions and parameters for communication on token ring networ...
gprof Tru64 Displays call-graph profile data
Copyright © 2004-2005 DeniX Solutions SRL
newsletter delivery service