Hi, we're trying to build a stack with two MS425-32 in two DC's over a distance of appr. 400 mtr. using QSFP-40 LC/LC and singlemode fiber. First we tried using a stack cable of 1mtr. and it works fine, but with the QSFP's and over a larger distance the device won't get connected and show lots of CRC errors. SM fiber is OK, it's new, tested, we even used different fiber pairs. QSFP are brandnew Cisco certified Anyone having experience on this.
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