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vv(4)				  Unsupported				 vv(4)

Name
       vv - Proteon proNET 10 Megabit ring

Syntax
       device vv0 at uba0 csr 0161000 vector vvrint vvxint

Description
       The interface provides access to a 10 Mb/s Proteon proNET ring network.

       The network number to which the interface is attached must be specified
       with an SIOCSIFADDR ioctl before data can be transmitted	 or  received.
       The  host's  address  is discovered by putting the interface in digital
       loopback mode (not joining the ring) and	 sending  a  broadcast	packet
       from  which  the	 source address is extracted.  the Internet address of
       the interface would be 128.3.0.24.

       The interface software implements  error-rate  limiting	on  the	 input
       side.   This provides a defense against situations where other hosts or
       interface hardware failures  cause  a  machine  to  be  inundated  with
       garbage	packets.  The scheme involves an exponential backoff where the
       input side of the interface is disabled for longer and longer  periods.
       In  the	limiting case, the interface is turned on every two minutes or
       so to see if operation can resume.

       If the installation is running CTL boards which use the	old  broadcast
       address	of 0 instead of the new address of 0xff, the define OLD_BROAD‐
       CAST should be specified in the driver.

       If the installation has a Wirecenter, the define WIRECENTER  should  be
       specified  in the driver.  N.B.: Incorrect definition of WIRECENTER can
       cause hardware damage.

       The interface normally tries to use a ``trailer'' encapsulation to min‐
       imize  copying  data  on	 input and output.  This may be disabled, on a
       per-interface basis, by setting the IFF_NOTRAILERS flag with  an	 SIOC‐
       SIFFLAGS ioctl.

Diagnostics
       vv%d: host %d.
       The  software announces the host address discovered during autoconfigu‐
       ration.

       vv%d: can't initialize.
       The software was unable to discover the address of this	interface,  so
       it deemed "dead" will not be enabled.

       vv%d: error vvocsr=%b.
       The hardware indicated an error on the previous transmission.

       vv%d: output timeout.
       The token timer has fired and the token will be recreated.

       vv%d: error vvicsr=%b.
       The hardware indicated an error in reading a packet off the ring.

       en%d: can't handle af%d.
       The  interface  was  handed  a  message	with addresses formatted in an
       unsuitable address family; the packet was dropped.

       vv%d: vs_olen=%d.
       The ring output routine has been handed a message with  a  preposterous
       length.	This results in an immediate panic: vs_olen.

See Also
       intro(4n), inet(4f)

				      VAX				 vv(4)

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