bcm man page on OSF1

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bcm(7)									bcm(7)

NAME
       bcm - DEGXA Gigabit Ethernet interface

SYNOPSIS
       config_driver	bcm

DESCRIPTION
       The bcm interface provides access to Gigabit Ethernet (1000Mbs) through
       the DEGXA device.  The interface supports full-duplex  operation	 in  a
       switched	 or  point-to-point  configuration, and provides the following
       features: The interface has Link Autonegotiation	 enabled  by  default.
       Some  switches  do  not	support	 Link  Autonegotiation.	  To turn Link
       Autonegotiation off, use the following command:

	      # lan_config -ibcm0 -a0

	      Note that you may add this command to the	 /etc/inet.local  file
	      to  preserve  the	 setting of Link Autonegotiation across system
	      restarts.

	      If you manually set the speed by using the ifconfig or  lan_con‐
	      fig  commands, autonegotiation is automatically disabled. If you
	      then want to enable autonegotiation (for	example	 on  interface
	      bcm0), use the following command:

	      #	 lan_config  -ibcm0 -a1 JUMBO packets are disabled by default.
	      JUMBO packets provide a non-standard larger packet  size.	  This
	      enables the interface to carry more data with less CPU overhead.
	      To enable JUMBO packets, use the following command:

	      # ifconfig bcm0 ipmtu 9000

	      Note that there are several interoperability issues  with	 using
	      JUMBO packets (for example, if your switch goes from 1000Mbps to
	      a 100Mbps client, JUMBO packets will not work on a 100Mbps LAN).
	      In  order	 to use JUMBO frames, you will need a switch that sup‐
	      ports JUMBO frames or  a	point-to-point	configuration  with  a
	      partner  that  supports  JUMBO  frames.  Receive flow control is
	      enabled. There is currently no way to turn this off.

       For the DEGXA-SX, we recommend that you use the auto-negotiation proto‐
       col.  This protocol has been thoroughly tested, and works reliably with
       many different switch vendors over Gigabit  Ethernet.  If  you  disable
       auto-negotiation, the switch port setting and the DEGXA-SX setting must
       match perfectly, otherwise you might encounter  interoperability	 prob‐
       lems. The DEGXA-SX (fiber optic version) runs at 1000Mbps only.

       For  the DEGXA-TX (the copper version of the Gigabit Ethernet NIC), you
       must enable auto-negotiation. This is a mandatory  requirement  of  the
       IEEE  802.3ab  auto-negotiation protocol. The DEGXA-TX can run at 1000,
       100, or 10 Mbps.

       Gigabit Ethernet performance with TCP/IP depends	 on  several  factors.
       Some of the influencing factors are as follows: The speed at which data
       can be delivered to  the	 interface  influences	throughput.   If  your
       CPU(s)  are  busy  doing several tasks, the task using Gigabit Ethernet
       may not get enough run time to deliver  packets.	  In  general,	faster
       CPUs  will  deliver  better  throughput.	 Fast access to the PCI bus is
       critical for high throughput.  Using a 64-bit PCI slot  will  give  you
       better  performance  and use less PCI resources than a 32-bit PCI slot.
       Putting the interface on the same PCI bus  as  other  peripherals  will
       degrade	throughput.   Each system type may also have different PCI-to-
       host speed considerations (the speed at which the PCI-to-host  hardware
       allows  the  device to operate).	 The standard TCP/IP applications (for
       example, ftp and rcp) are not designed to run at	 Gigabit  speeds.  TCP
       applications that expect performance should use a message size of 65000
       bytes and a window size of 128000 bytes.	 Even when an  application  is
       modified	 to use these settings, high throughput may not be attainable.
       This is particularly true when an application is waiting	 for  data  to
       send (data from a disk, for example).

ERRORS
       The  following  diagnostic and error messages contain relevant informa‐
       tion provided by the bcm interface, and are displayed to	 the  console.
       Each message begins with the adapter identification, including the num‐
       ber of the adapter.  The bcm interface  could  not  find	 adequate  I/O
       addressing  on  this system to operate.	This is a fatal error, and the
       DEGXA-SA will not operate on this system.  Indicates that  the  Gigabit
       Ethernet	 link  is up, and the autonegotiation protocol was used to set
       the speed and duplex mode.  Note, this will only appear if autonegotia‐
       tion  is	 enabled.  Indicates that the Gigabit Ethernet link is up, and
       was manually configured.	 Indicates that the link is no	longer	estab‐
       lished.	No communication will occur over the link while it is down.

SEE ALSO
       Commands: ifconfig(8), lan_config(8)

       Files: inet.local(4)

       Network information: arp(7), inet(7), netintro(7)

									bcm(7)
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