From: David Schwarze (schwarze@ev1.net)
Date: Wed Jul 14 2004 - 10:56:47 EDT
I have a problem with duplicate mac addresses.
The specs are as follows - two SunBlade 2500 machines in a VME chassis each
with SUNW,qlc dual fc interfaces (QLogic).
The SunBlades are connected via 2G FC to a QLogic SANbox 5200 switch.
I configure the interfaces as follows (numbers are different, but analogous
to mine):
Blade 1: ifconfig fcip0 inet 192.168.0.1 netmask 255.255.255.0 broadcast
192.168.0.255
Blade 2: ifconfig fcip0 inet 192.168.0.2 netmask 255.255.255.0 broadcast
192.168.0.255
After rebooting the blades but before I connect either blade to the switch,
an ifconfig -a does not show ether (as in mac-address) information.
When I plug the blades into the switch and do another ifconfig -a, the
ether information is present and the mac addresses are the same. This
causes problems, of course.
After disconnecting the fcip interfaces, I try to change the MAC address on
the cards like so:
old ether was 0:e0:8b:12:12:12 (last half different than mine)
I do: ifconfig fcip0 ether 0:e0:8b:13:12:12
... and the command never returns.
It almost looks as if the interfaces are getting their mac address from the
switch, but QLogic says this isn't happening. I thought that Suns got
their mac addresses from the hostid and the hostids on the two blades are
different (though similar).
I should probably mention that local-mac-address is set to TRUE and that,
for each blade, fcip0 and fcip1 do NOT have conflicting mac addresses. It
is only when two blades are networked together with the same interface
(i.e. fcip0) that problems occur.
I have spent an entire workday on this so far, including searching the web
and trying (unsuccessfully) to search the archives of this list
directly. Replies greatly appreciated.
Thanks,
-David
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