Run the display interface vlanifvlan-id command on Switch _1 and Switch _2 and check the current state and Line protocol current state fields. If the value of any one of the two fields is DOWN, the VLANIF interface is Down. This document describes how to troubleshoot fiber optic interfaces by addressing some of the fiber optic module and cabling specifications. There are no specific requirements for this document. I have a school site that has an upper campus and a lower campus. Hi John, From the lower campus switch, if you can login, can you check the output of "show. The issue appears to be between the switches, but as I said, the Fibre has been tested, the SFPs have been swapped, the switches are reporting Link, but they're dumb switches so there's no way to check anything more on them. -We use an HA setup for the routers, with our main switch, which then connects to all of the other switches directly through CAT or Fiber. I have a multi mode fiber patch cable connecting the two switches but I cant ping the other switch.
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