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Full Discussion: Trying to verify actual switchport speed
Operating Systems AIX Trying to verify actual switchport speed Post 302467611 by shockneck on Saturday 30th of October 2010 08:30:34 AM
Old 10-30-2010
Quote:
Originally Posted by landog
[...]

chdev -P -l ent0 -a media_speed=1000_Full_Duplex
ent0 changed

lsattr -EH -l ent0 -a media_speed
attribute value description user_settable
media_speed 1000_Full_Duplex Media speed True

However:
netstat-v shows (among other things):
Link Status : Up
Media Speed Selected: 100 Mbps Full Duplex
Media Speed Running: 100 Mbps Full Duplex


What speed am I actually connected at??

[...]
1) "chdev -P" changes the ODM but not the running device. To actually change the settings you would now need to deactivate the device with "rmdev -l" and activate it again with "mkdev -l". However, you have no guarantee that the switch would react to this change. This might lead to problems as the autonegotiation as defined in the Ethernet Standard takes place only once on first connection before a data packet has been send. If the switch does not react on switching the adapter off and on again the speed might stay at 100 Full or Half without netstat being able to tell you so.

2) "lsattr -El" reads the information from the ODM but not from the running device. So yes, because you changed the ODM you get the information what settings are there. However, that does not have to be the current settings of the device and in your case it definitely is not.

3) Never use different settings on switch and adapter side. If your switch is set to autosense your adapter must be set to autonegotiate too. If your switch ist set to a fixed value, set the adapter settings accordingly. With different settings you have a good chance of ending with Half-Duplex because the standard tells the port to work like this if there are problems during portspeed settings detection. Next to routing problems this is a major reason for slow network connections.

Coming back to what you asked initially. You probably are at 100 Full but you cannot be 100% sure as the netstat output is not always reliable here.
 

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LEARN ABOUT SUSE

ethtool

ETHTOOL(8)						      System Manager's Manual							ETHTOOL(8)

NAME

       ethtool - Display or change ethernet card settings

SYNOPSIS

       ethtool ethX

       ethtool -h|--help

       ethtool -a|--show-pause ethX

       ethtool -A|--pause ethX [autoneg on|off] [rx on|off] [tx on|off]

       ethtool -c|--show-coalesce ethX

       ethtool	-C|--coalesce  ethX  [adaptive-rx on|off]  [adaptive-tx on|off] [rx-usecs N] [rx-frames N] [rx-usecs-irq N] [rx-frames-irq N] [tx-
       usecs N] [tx-frames N] [tx-usecs-irq N] [tx-frames-irq N] [stats-block-usecs N] [pkt-rate-low N] [rx-usecs-low N]  [rx-frames-low  N]  [tx-
       usecs-low N] [tx-frames-low N] [pkt-rate-high N] [rx-usecs-high N] [rx-frames-high N] [tx-usecs-high N] [tx-frames-high N] [sample-interval
       N]

       ethtool -g|--show-ring ethX

       ethtool -G|--set-ring ethX [rx N] [rx-mini N] [rx-jumbo N] [tx N]

       ethtool -i|--driver ethX

       ethtool -d|--register-dump ethX [raw on|off] [hex on|off] [file name]

       ethtool -e|--eeprom-dump ethX [raw on|off] [offset N] [length N]

       ethtool -E|--change-eeprom ethX [magic N] [offset N] [value N]

       ethtool -k|--show-offload ethX

       ethtool -K--offload ethX [rx on|off] [tx on|off] [sg on|off] [tso on|off] [ufo on|off] [gso on|off]

       ethtool -p|--blink ethX [N]

       ethtool -r|--negotiate ethX

       ethtool -S|--statistics ethX

       ethtool -t|--test ethX [offline|online]

       ethtool -s ethX [speed 10|100|1000|2500] [duplex half|full] [port tp|aui|bnc|mii] [autoneg on|off] [advertise  N]  [phyad  N]  [xcvr inter-
       nal|external] [wol p|u|m|b|a|g|s|d...]  [sopass xx:yy:zz:aa:bb:cc] [msglvl N]

DESCRIPTION

       ethtool is used for querying settings of an ethernet device and changing them.

       ethX is the name of the ethernet device on which ethtool should operate.

OPTIONS

       ethtool with a single argument specifying the device name prints current settings of the specified device.

       -h --help
	      Shows a short help message.

       -a --show-pause
	      Queries the specified ethernet device for pause parameter information.

       -A --pause
	      Changes the pause parameters of the specified ethernet device.

       autoneg on|off
	      Specifies whether pause autonegotiation should be enabled.

       rx on|off
	      Specifies whether RX pause should be enabled.

       tx on|off
	      Specifies whether TX pause should be enabled.

       -c --show-coalesce
	      Queries the specified ethernet device for coalescing information.

       -C --coalesce
	      Changes the coalescing settings of the specified ethernet device.

       -g --show-ring
	      Queries the specified ethernet device for rx/tx ring parameter information.

       -G --set-ring
	      Changes the rx/tx ring parameters of the specified ethernet device.

       rx N   Changes the number of ring entries for the Rx ring.

       rx-mini N
	      Changes the number of ring entries for the Rx Mini ring.

       rx-jumbo N
	      Changes the number of ring entries for the Rx Jumbo ring.

       tx N   Changes the number of ring entries for the Tx ring.

       -i --driver
	      Queries the specified ethernet device for associated driver information.

       -d --register-dump
	      Retrieves  and  prints a register dump for the specified ethernet device.  The register format for some devices is known and decoded
	      others are printed in hex.  When raw is enabled, then ethtool dumps the raw register data to stdout.  If file is specified, then use
	      contents of previous raw register dump, rather than reading from the device.

       -e --eeprom-dump
	      Retrieves  and  prints  an EEPROM dump for the specified ethernet device.  When raw is enabled, then it dumps the raw EEPROM data to
	      stdout. The length and offset parameters allow dumping certain portions of the EEPROM.  Default is to dump the entire EEPROM.

       -E --change-eeprom
	      Changes EEPROM byte for the specified ethernet device.  offset and value specify which byte and it's new value.  Because of the per-
	      sistent nature of writing to the EEPROM, a device-specific magic key must be specified to prevent the accidental writing to the EEP-
	      ROM.

       -k --show-offload
	      Queries the specified ethernet device for offload information.

       -K --offload
	      Changes the offload parameters of the specified ethernet device.

       rx on|off
	      Specifies whether RX checksumming should be enabled.

       tx on|off
	      Specifies whether TX checksumming should be enabled.

       sg on|off
	      Specifies whether scatter-gather should be enabled.

       tso on|off
	      Specifies whether TCP segmentation offload should be enabled.

       ufo on|off
	      Specifies whether UDP fragmentation offload should be enabled

       gso on|off
	      Specifies whether generic segmentation offload should be enabled

       -p --identify
	      Initiates adapter-specific action intended to enable an operator to easily identify the adapter by sight.  Typically  this  involves
	      blinking one or more LEDs on the specific ethernet port.

       N      Length of time to perform phys-id, in seconds.

       -r --negotiate
	      Restarts auto-negotiation on the specified ethernet device, if auto-negotiation is enabled.

       -S --statistics
	      Queries the specified ethernet device for NIC- and driver-specific statistics.

       -t --test
	      Executes adapter selftest on the specified ethernet device. Possible test modes are:

       offline|online
	      defines  test  type:  offline (default) means to perform full set of tests possibly causing normal operation interruption during the
	      tests, online means to perform limited set of tests do not interrupting normal adapter operation.

       -s --change
	      Allows changing some or all settings of the specified ethernet device.  All following options only apply if -s was specified.

       speed 10|100|1000|2500
	      Set speed in Mb/s.  ethtool with just the device name as an argument will show you the supported device speeds.

       duplex half|full
	      Sets full or half duplex mode.

       port tp|aui|bnc|mii
	      Selects device port.

       autoneg on|off
	      Specifies whether autonegotiation should be enabled. Autonegotiation is enabled by deafult, but in some  network	devices  may  have
	      trouble with it, so you can disable it if really necessary.

       advertise N
	      Sets the speed and duplex advertised by autonegotiation.	The argument is a hexidecimal value using one or a combination of the fol-
	      lowing values:
	      0x001    10 Half
	      0x002    10 Full
	      0x004    100 Half
	      0x008    100 Full
	      0x010    1000 Half(not supported by IEEE standards)
	      0x020    1000 Full
	      0x8000   2500 Full(not supported by IEEE standards)
	      0x800    10000 Full
	      0x03F    Auto

       phyad N
	      PHY address.

       xcvr internal|external
	      Selects transceiver type. Currently only internal and external can be specified, in the future further types might be added.

       wol p|u|m|b|a|g|s|d...
	      Sets Wake-on-LAN options.  Not all devices support this.	The argument to this option is a string  of  characters  specifying  which
	      options to enable.
	      p  Wake on phy activity
	      u  Wake on unicast messages
	      m  Wake on multicast messages
	      b  Wake on broadcast messages
	      a  Wake on ARP
	      g  Wake on MagicPacket(tm)
	      s  Enable SecureOn(tm) password for MagicPacket(tm)
	      d  Disable (wake on nothing).  This option clears all previous options.

       sopass xx:yy:zz:aa:bb:cc
	      Sets the SecureOn(tm) password.  The argument to this option must be 6 bytes in ethernet MAC hex format (xx:yy:zz:aa:bb:cc).

       msglvl N
	      Sets the driver message level. Meanings differ per driver.

BUGS

       Not supported (in part or whole) on all ethernet drivers.

AUTHOR

       ethtool was written by David Miller.

       Modifications by Jeff Garzik, Tim Hockin, Jakub Jelinek, Andre Majorel, Eli Kupermann, Scott Feldman, Andi Kleen.

AVAILABILITY

       ethtool is available over the Web on the SourceForge site at http://sourceforge.net/projects/gkernel/

Ethtool version 6						     July 2007								ETHTOOL(8)
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