Create Date: Apr 10 2012 2:12AM
it should be possible.
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Table 1: Required Minimum Software Versions
Manufacturing
Part Number Minimum Software Version
800230-00 ExtremeXOS 12.1.1 (or later)
800314-00 ExtremeXOS 12.1.4.2-patch1-3 (or later 12.1 release)
or
12.2.1 (or later)
CAUTION
"If you install an MSM-48c into a system with a primary MSM-G8X or MSM-48 running a software build earlier than
the required minimum ExtremeXOS version (see Table 1), your system may CRASH or not operate correctly.
A software upgrade may not be possible until the MSM-48c is removed."
--> see http://www.extremenetworks.com/libraries/services/120409-00_Rev_04_MSM-48c_Module_Release_Note.pdf
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(from matthias_mager)