General Switching : troubleshooting
- Troubleshooting a switched network
- get familiar with the network
- absolutely have an accurate network diagram
- work logically, from the bottom up (OSI)
- Common Troubleshooting Issues
- Port issues:
- check cabling issues
- verify speed and duplex auto negotiation
- check that assigned vlan has not been deleted
- Spanning Tree Issues
- solve the immediate issue (disconnect redundant link)
- ensure that all links are reflected on the network diagram
- ensure that the root bridge selection is appropriate
- make sure all switches are running RSTP
- there is a 7 switch limit to STP
- VLAN and trunking issues
- watch for native vlan mismatch
- hard code trunk ports to on
- verify IP address assignments in a vlan
- use ping and traceroute to diagnose routing issues
- VTP Issues
- verify trunks
- verify vtp info: name, password, version, modes
- last resort: delete flash:vlan.dat and reconfig
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