3Com elxl in Solaris 10: Force full duplex?

After being up for a few hours, my Solaris 10 (11/06 release, patched up to date), appears to virtually stop functioning network-wise; throughput goes to single-digits/second. I'm guessing this is a duplex mis-match, but editing /kernel/drv/elxl.conf to force full-duplex kills the NIC altogether, generating a stream of errors.
Searching this forum shows discussions of stuff like this going back to Solaris 8, but most threads are inconclusive.
Anyone have a final conclusion?

But when I want
a static ip by putting the ip in hostname.bcme0 it
gives me this in bootup(pasted only the interesting
bits):As the filename hostname.bcme0 already suggests you don't enter an IP adress there but a hostname. The IP adres is then picked up by checking the hostname against /etc/inet/hosts.
You might want to check out http://docs.sun.com/app/docs/doc/816-4554/816-4554#hic for more information on this matter.

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    Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(53)SE2, RELEASE SOFTWARE (fc3)
    Technical Support: http://www.cisco.com/techsupport
    Copyright (c) 1986-2010 by Cisco Systems, Inc.
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    Importers, exporters, distributors and users are responsible for
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