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NetBSD 6.1.5 - man page for pvctxctl (netbsd section 8)

PVCTXCTL(8)			   BSD System Manager's Manual			      PVCTXCTL(8)

     pvctxctl -- display or control ATM PVC transmitter parameters

     pvctxctl interface [[vpi:]vci]
     pvctxctl interface [vpi:]vci [-n] [-b max-bandwidth] [-j [vpi:]vci] [-p pcr]

     pvctxctl displays or controls the shaper parameters of an ATM VC.	When a shaper value is
     specified, pvctxctl sets a shaper to an ATM VC.  pvctxctl works for a PVC sub interface
     pvc(4) as well as a real ATM interface en(4).

     For a real ATM interface, the specified VC should be assigned beforehand by route(8).

     For a sub interface, pvctxctl assigns the specified VC to the sub interface.  If another VC
     is already assigned to the sub interface, the old VC is invalidated.

     Availability of shapers, the number of hardware shaper channels, and accuracy of shaping are
     all device dependent.  For example, ENI Midway chip has 8 shaper channels but the driver
     reserves one for non-shaping VCs.

     The options are as follows:

     interface	 The interface parameter is a string of the form ``name unit'', for example,

     [vpi:]vci	 The VC number to which the shaper is assigned.  When the VPI number is omitted,
		 VPI number 0 is assumed.  For example, to assign a shaper to VPI=0 and VCI=201,
		 the following forms can be used: "201", "0xc9", "0:201", "0:0xc9".

     -b max-bandwidth
		 The PCR parameter can be specified also in ``bits per second''.  The rate is the
		 rate of AAL5 frame and the PCR is calculated by the following form:

		       PCR = max-bandwidth / 8 / 48

		 ``K'' and ``M'' can be used as a short hand of ``000'' and ``000000'' respec-
		 tively.  For example, ``45M'' means ``45Mbps'' or PCR value ``117187''.

     -j [vpi:]vci
		 The join parameter is intended for VP shaping.  The VC shaper channel is shared
		 with the existing VC, which means the sum of the cell rates never exceeds the
		 maximum PCR among the shared VCs.  On the other hand, when the shaper channel is
		 not shared, the sum of the cell rates could be the sum of the PCRs.

		 For example, if two VCs (say 201 and 202) share a 45Mbps VP, use:

		       # pvctxctl en0 201 -b 45M
		       # pvctxctl en0 202 -b 45M -j 201

     -n 	 This parameter is only for a sub interface.  Use NULL encapsulation instead of

     -p pcr	 The PCR (Peak Cell Rate) parameter specifies the peak cell rate in "cells per
		 second".  If PCR value "0" is specified, no shaper is assigned, which means
		 cells are sent at full-speed of the link.  If PCR value ``-1'' is specified, the
		 corresponding VC is invalidated.

     en(4), ifconfig(8), pvcsif(8), route(8)

     A real ATM interface and a sub interface require different sequences to set a shaper.  For
     example, to assign a 45Mbps shaper to VC 201 (0xc9) of en0:

	   # ifconfig en0
	   # route add -iface -link en0:3.0.0.c9
	   # pvctxctl en0 0xc9 -b 45M

     For a shadow interface,

	   # pvcsif en0 			   # creates pvc0
	   # ifconfig pvc0
	   # pvctxctl pvc0 201 -b 45M

BSD					December 29, 1997				      BSD

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