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You are here: Home / ICND1 / Day 15 – Layer 1 and Layer 2 Troubleshooting / Day 15 Tasks / Troubleshooting VLANs and Trunking

Troubleshooting VLANs and Trunking

In the previous section, we discussed the use of three CLI commands that can be used for troubleshooting Physical Layer issues. This section describes some common approaches to identifying and troubleshooting intra-VLAN connectivity issues. Some of the more common causes of intra-VLAN connectivity issues include the following:

  • Duplex mismatches
  • Bad NIC or cable
  • Congestion
  • Hardware issues
  • Software issues
  • Resource oversubscription
  • Configuration issues

Duplex mismatches can result in very slow network performance and connectivity. While some improvements in auto-negotiation have been made . . .

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