Planning to upgrade our Cisco Catalyst 6807xl Sup6T VSS clusters 15.4 (1) SY2-> 15.5 (1) SY1 Can we do it with ISSU or eFSU to get as little interruption as possible? Finds no information about it when I go from 15.4 (1) SY2-> 15.5 (1) SY1
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