Hello All,

I ran some test on this when 100BT first came out on 3000e MPE systems
against HP Procure switches that I could get my hands on: 4000, 2708 and
2224 as well as a HP 100BT hub (I do not have a number for this hub and I am
pretty sure is no longer sold).

Results:

Hub: 100/duplex=half/auto-negotiate=no (works)

Procure:

4000: 100/duplex=full/auto-negotiate=yes (works)
4000: 100/duplex=full/auto-negotiate=no (works)

2708: 100/duplex=full/auto-negotiate=yes (works)
2708: 100/duplex=full/auto-negotiate=no (RECV CRC Err, RECV Dropped)

2224: 100/duplex=full/auto-negotiate=yes (works)
2224: 100/duplex=full/auto-negotiate=no (RECV CRC Err, RECV Dropped)

These tests were run with matching configuration in the switch and the host.

I found the details of this operation in the ProCurve reference for 2708
10/100/1000 that switch that "auto-negotiate=yes" was as per compliance with
the IEEE 802.3 standard:

See: ftp://ftp.hp.com/pub/networking/software/59903055.pdf page 3-1

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Basic Troubleshooting Tips
Most problems are caused by the following situations. Check for these items
first when starting your troubleshooting:
│ Connecting the RJ-45 ports to devices that have a fixed full-duplex
configuration. The Series 2700 Switch RJ-45 ports are configured as
"Auto". That is, when connecting to attached devices, the switch will
operate in one of two ways to determine the link speed and the communication
mode (half duplex or full duplex):
 if the connected device is also configured to Auto, the switch will
automatically negotiate both link speed and communication mode
 if the connected device has a fixed configuration, for example 100
Mbps, at half or full duplex, the switch will automatically sense the
link speed, but will default to a communication of half duplex
Because the Series 2700 Switches behave in this way (compliance with
the IEEE 802.3 standard), if a device connected to the switch RJ-45 ports
has a fixed configuration at full duplex, the device will not connect
correctly to the switch. The result will be high error rates and very
inefficient communications between the switch and the device.
Make sure that all devices connected to the Series 2700 Switches' RJ-45
ports are configured to auto negotiate, or are configured to connect at half
duplex (all hubs are configured this way, for example).
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As always your mileage will vary.  What ever configuration you go with for
your 3000e MPE 100BT, check your results with ":linkcontrol @;status=all"!!!


I hope this helps:

Regards,
 James Hofmeister

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