Mismatched MTU, Bad Modules, Power Failure and Missing Routes

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Mismatched MTU, Bad Modules, Power Failure and Missing Routes

Mismatched MTU, Bad Modules, Power Failure and Missing Routes

This lesson continues to cover trouble shooting common wire and switch issues and discusses the following:

  • Mis-matched Maximum Transmission Unit (MTU)/Black Hole: packets are too large for a certain ‘hop’ and are dropped. If no error about the packet is received, essentially we’ve hit a Black Hole.
  • Bad Modules (SFP, GBIC): Bad port module on device
  • Power Failure: Device may have lost power
  • Bad/missing routes: routing information is incorrect
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