Figure 2-40 shows the ?¬‚ow used for troubleshooting VTP issues.
Figure 2-40 VTP Troubleshooting
Unable to See VLAN Details in the show run Command Output
VTP client and server systems require VTP updates from other VTP servers to be
immediately saved without user intervention. A VLAN database was introduced into Cisco
IOS Software as a method to immediately save VTP updates for VTP clients and servers.
In some versions of software, this VLAN database is in the form of a separate ?¬?le in Flash,
called the vlan.dat ?¬?le. You can view VTP and VLAN information that is stored in the
vlan.dat ?¬?le for the VTP client or VTP server if you issue the show vtp status command.
VTP server and client mode switches do not save the entire VTP and VLAN con?¬?guration
to the startup-con?¬?g ?¬?le in NVRAM when you issue the copy running-con?¬?g startupcon
?¬?g command on these systems. VTP saves the con?¬?guration in the vlan.dat ?¬?le. This
behavior does not apply to systems that run in VTP transparent mode. VTP transparent
Troubleshoot
Physical Layer
Port Connectivity
Issues
Troubleshoot
VLAN/Trunking
Issues
Troubleshoot
VTP
Issues
Troubleshoot
Spanning-Tree
Issues
Can you
see VLAN
details in the
show run
command
output?
Do switches
exchange VTP
information?
Does an
inserted switch
cause network
problems?
Are all
ports inactive
after power
cycle?
Troubleshooting Switched Networks 83
switches save the entire VTP and VLAN con?¬?guration to the startup-con?¬?g ?¬?le in NVRAM
when you issue the copy running-con?¬?g startup-con?¬?g command.
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