When the SFE/SGE series products went to version 3 of the firmware we saw much better support for VLAN and other features such as IPv6. That might account as to why admin guides were missing content on IPv6 as they may have been references for Version1 firmware and not version 3 firmware.
All SFE/SGE's now support version 3 code.
If you do not need the stacking support from the SGE/SFE series why not look seriously at the lower cost SG300 and SF300 series.
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