また VSP7400-32C は 28 番ポートがブレークアウト非対応 <ref>[https://extreme-networks.my.site.com/ExtrArticleDetail?an=000104793 Unable to Channelize Port 1/28 on Extreme VSP 7432CQ]
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'''Cause'''
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Port 1/28 happens to be the last one in the hardware allocations on the switch and so that is why it is not channelizable.
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'''Resolution'''
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Do not use Port 1/28 for channelize connections</ref> です。