FDDI network NIC speed

[Jack_126]

Hi,
In one of my HP system having 10.20 FDDI card is installed. I checked the seed with sam it shows
Autonig-OFF
Speed-10 Million bps
Duplex-Half

when I try to configure it to chnage the speed,the following optins are not changing/not highlighted.
My question are..
1>is this card support for 100FD or not how to check.
2>If supports can I change it online without affecting the network connectivity.
Below is the output of lanscan and the /etc/rc.config.d/hpfddiconf file.

/etc/rc.config.d->more hpfddiconf
#####################################################################
# @(#) hpfddiconf $Revision: 1.1.10.1 $ $Date: 94/12/15 12:00:00 $
# hpfddiconf : contains configuration values for HP FDDI interfaces
#
# HP_FDDI_INTERFACE_NAME Name of interface (lan0, lan1...)
# HP_FDDI_STATION_ADDRESS Station address of interface
# configured through lanadmin(1m)
# This value must be prefixed with 0x
# and represented by hexidecimal digits
# (ie 0x080009xxxxxx)
# HP_FDDI_MTU Maximum transmission unit (bytes)
#
# The interface name, major number, card instance and nmid may be
# obtained from the lanscan(1m) command.
#
# The station address and mtu can be set through the lanadmin(1m) command.
#
#####################################################################

HP_FDDI_INTERFACE_NAME[0]=lan1
HP_FDDI_STATION_ADDRESS[0]=0x0060B00716C2
HP_FDDI_MTU[0]=4352

###########################################################################
# The HP_FDDI_INIT_ARGS are reserved by HP. They are NOT user changable.

HP_FDDI_INIT_ARGS="HP_FDDI_STATION_ADDRESS HP_FDDI_MTU"


# End of hpfddiconf configuration file


more print_info
Card Card Hardware Internet Station
Type Name Path Status Address Subnet Mask Address (hex)
FDDI lan1 10/4/4 Enabled 159.137.15.209 255.255.255.0 0060B00716C2

Regards
Jack

[Raj D. · Accepted solution]

Hi Jack ,

You can check with ioscan , for the FDDI card model , and can find out the speed details it will support.

you can try :

# ioscan -fnC lan

You can also check the PART details with:

http://www.partsurfer.hp.com/cgo-bin/spi/main

Cheers,
Raj.

[Raj D.]

Jack ,

Also you can check with lanscan and lanadmin for current speed parameters,

# lanscan [ to know the PPA number.]
# lanadmin -x 1 [ Assuming PPA number of the FDDI card is 1 ] It will show the current parameter that is set for this card.


Cheers,
Raj.

[john kingsley]

FDDI cards do not support the 10/100 half/full/duplex options. These options only apply to ethernet cards. Do you have multiple lan adapters in the system? What does the output "ioscan -funC lan" look like? Check and make sure your looking at the right card in SAM. The "Card Type" should be listed as FDDI. Under the FDDI configureation in sam, you should only be able to set MTU, Treq & Tnotify.

[Florian Heigl (new acc)]

FDDI will always run at 100 (iirc more exactly 125)MBit/s.

With it being a ring it's more like half-duplex, but it doesn't really matter as there are no collisions anyways :)

Is there any specific reason why You looked into changing this (but please note that it's not possible)

Florian

[Jack_126]

Hi,
The output of ioscan -fnC lan is...

/->ioscan -fnC lan
Class I H/W Path Driver S/W State H/W Type Description
===================================================================
lan 1 10/4/4 fddi CLAIMED INTERFACE HP J2157A - FDDI Interface
/dev/diag/lan1 /dev/lan1

The MTU is set to 4352. It is Max.Transfer Unit. But how much in mbps.

when I run lanadmin -s 1, it comes with no output.

One of you said that we can only change the MTU. How much should I keep to get the speed equivilent to 100mbps/Full duplex.

Regards
Jack

[john kingsley]

A FDDI ring will operate slightly faster than 100/FULL. You can't change this speed.

You shouldn't need to change MTU.

[Jack_126]

Hi,

As In my case the MTU is set to 4352 does it mean that its supporting 100/Full.

But only confusion is through SAM it shows
Speed-10 million bps
duplex-Half.

Could you please clarify more clearly.

Regards
Jack

[Jack_126]

Hi,

As In my case the MTU is set to 4352 does it mean that its supporting 100/Full.

But only confusion is through SAM it shows
Speed-10 million bps
duplex-Half.

If anyone have worked on it. Kindly pass the knowledge.

Regards
Jack

[Florian Heigl (new acc)]

Sam shows 10mbit/half for anything it can't properly query.

there is no duplex mode setting for FDDI, I'm quite sure everything is ok the way it is unless You tell me otherwise ;)

[rick jones]

Jack - when it comes to FDDI, forget virtually anything and everything you know about Ethernet. The two are completely different link-level technologies.