VTP not creating VLANs altough devices are shown

[aseques01]

I am having trouble trying to setup VTP on a already configured cisco 2960S. To improve the network consisteny I am trying to configure it as a VTP client for VTP3.

I followed the guide at cisco docs to troubleshooting and found that the usual cuplrits are:

• Different passwords on VTP
• Communication problems on the interfaces seen by the switches

In my case I think that none of those are issues, also I can do on the 2960s a show vtp devices and I get a proper list of devices

# sh vtp devices 
Retrieving information from the VTP domain. Waiting for 5 seconds.

VTP Feature Conf Revision Primary Server Device ID Device Description 
------------ ---- -------- -------------- -------------- ----------------------
VLAN   Yes       56 4001.7ad3.cfc0 0c85.258e.1254      SW11 
VLAN   Yes       56 4001.7ad3.cfc0 2852.61e7.1254      SW12 
VLAN   Yes       56 4001.7ad3.cfc0=4001.7ad3.1254      SW00 
VLAN   Yes       56 4001.7ad3.cfc0 64ae.0c75.1254      SW14

Enabling debug with these commands doesn't show any useful information about errors or anything remarcable

debug sw-vlan vtp packets 
debug sw-vlan vtp events 

Any ideas? I am quite lost and I tried all the tricks (setting to transparent then back to client, renaming VLANs trigger VTP, etc)..

[aseques01]

Same again, no changes, still showing the 1005 vlan limit and not receiving any new VLANs

[Georg Pauwen]

Hello,

can you post the output of:

dir flash:

[MHM Cisco World]

check my comment above 

[aseques01]

Hi @Georg Pauwen I did that without effect too,  I had to set the mode to transparent first because on client mode I couldn't change the VTP version (I could only do the 'no vtp version 3')

Still, after the changes, the samb vtp config arised.

See inline the output of the dir flash, it looks normal to me with only one occurrence of vlan.dat (this is after the file was recreated by the switch):

#dir flash:
Directory of flash:/

2 -rwx 10372 Dec 15 2022 16:56:09 +01:00 vlan.dat
3 -rwx 27297 Mar 1 1993 01:10:34 +01:00 config.text.backup
5 -rwx 5144 Dec 15 2022 11:24:20 +01:00 multiple-fs
6 -rwx 3832 Mar 1 1993 01:10:34 +01:00 private-config.text.backup
7 -rwx 16954368 Jan 24 2017 16:36:19 +01:00 c2960s-universalk9-mz.152-2.E6.bin
8 drwx 512 Mar 1 1993 01:11:46 +01:00 c2960s-universalk9-mz.122-55.SE3
587 -rwx 27204 Mar 1 1993 01:23:21 +01:00 startold.backup
588 -rwx 1921 Dec 15 2022 11:24:20 +01:00 private-config.text
589 -rwx 13322 Dec 15 2022 11:24:20 +01:00 config.text

[Georg Pauwen]

Hello,

annoying. What if you set the vtp mode to 'off' (vtp mode off), then delete the vlan.dat file, and then set the VTP mode to version 3 again ?

[aseques01]

No change unfortunately:

(config)#vtp mode off  
Setting device to VTP Off mode for VLANS.

#delete flash:vlan.dat 
Delete filename [vlan.dat]?  
Delete flash:/vlan.dat? [confirm]

#vtp mode client  
Setting device to VTP Client mode for VLANS.

#sh vtp status | include Ma 
Maximum VLANs supported locally   : 1005