Chapter 18 Troubleshooting IP network connectivity

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Okke Formsma edited this page Feb 22, 2014 · 1 revision

Late collision counter increments with duplex mismatches

troubleshooting vlans

show vlan [brief]
show mac address-table
show interfaces <interface> switchport

fix:

S(config-if) switchport access vlan [id]

trunk troubleshooting

show interfaces trunk
show vlan
show interfaces <interface> trunk
show interfaces <interface> switchport
sh dtp 
switchport mode
switchport mode dynamic desirable
switchport trunk native vlan <vlan>
switchport trunk encapsulation dot1q