Move a switch from VTP client mode to VTP transparent mode

Hi,
Does anybody have an experience / knowledge if I move a switch from VTP client mode to VTP transparent mode, should I re-create all the VLANs on this switch?
Thank you!

Hi there,
The VTP and the VLANs are seperate beasts.
The switch has a vlan database which is held in a seperate file to the config. If you type "sh flash" you'll see it in there.
VTP passes around the VLAN information and the switch stores it in the vlan database. If you remove the switch from the VTP domain, then VTP will not be able to update this file and it will remain exactly as it was.
In short - if you've got 20 vlans, when you go to VTP transparent, you'll still have 20 vlans
Regards,
LH
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 Hi all,
Need to ask question when using VTP transparent mode is it good idea to use VTP domain name and password?
I know for switches in transparent mode they act as independent of each other.
So need to know why we should use vtp domain and password with transparent mode?
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I know this 2 years later, but it will help others who will come across this. If you have a Transparent switch mixed with Server and Clients switches. This is your concern....... If you do not put the Transparent switch in the same domain, then it will not forward VLAN changes to other swithces.
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firewall transparent
hostname ASA-IPS
interface GigabitEthernet0/0.20
vlan 20
nameif Outside2
bridge-group 2
security-level 0
interface GigabitEthernet0/0.10
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bridge-group 1
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interface GigabitEthernet0/1.22
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security-level 100
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Switch behaviour in VTP CLIENT mode

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Hi ankurbhasin!
I also used to think what it works in way you wrote above. But I say one more time:
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Why my VTP client switch changes automatically to vtp transparent?

hi ppl!
i got a severe problem in my network. currently, we are implementing cisco 5509 catos based layer switch as our vtp mode server. so when i tried to hook up a new cisco 2950 switch by configuring it as vtp client with the same vtp domain name with dat of cisco 5509 vtp server mode, it will automatically change to vtp transparent mode but with the same vtp domain name. so, is there anyone dat can give me the best solution to mitigate my problem. e-mail me via [email protected]
dawit [B.Sc,CCNA,CCNP], Ethiopia
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Vipul,
Not sure what your interviewer was expecting as an answer. But yes your understanding is perfectly correct that you cannot create/modify/delete the vlans from client mode as it would through you the error saying: " VTP vlan configuration ont allowed when the device is in CLIENT mode.".
The only difference I can think of: As a _user_ in VTP client mode you have restrictions on_what you can do_ (create,delete,modify) to the vlan.dat file whereas in Server mode you(the user) have none of those restrictions. But from the _switches'_ own perspective it doesn't make the distinction between the two modes. In other words the switch is not aware of the mode the other switches are in.
A switch would not advertise to another switch like "hey I am a client/server" but will advertise "hey this is my revision number" and the other switch will then compare to it's own. The one with the highest revision number will be the one who gets the privelege to 'sync' its vlan.dat to the other switch.
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Basically VTP server mode can create and modify VLAN configuration but actually there is not any VLAN configuration through running-config, is it true? When I checked it on Cat3550, certainly there is not VLAN configuration on VTP server mode. But VTP transparent can create VLAN and configuration but does not synchronize with other switch VLAN status. I appreciate any related information and reason of the VTP server mode specification, thank you very much.
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3550#sh vtp status
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Configuration Revision : 0
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VTP Operating Mode : Transparent
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
*omit
3550#
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Building configuration...
*omit
vlan 99
name TEST-VLAN
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3550#sh vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs : 27
VTP Operating Mode : Server
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
*omit
3550#
3550#sh run
Building configuration...
*no VLAN like above configuration on VTP transparent mode.
Best Regards,
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Hi mhiyoshi,
3550#sh vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs : 27
VTP Operating Mode : Transparent
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
*omit
3550#
3550#sh run
Building configuration...
*omit
vlan 99
name TEST-VLAN
The above out put indicates that Vlan is created and then mode changed to transparent. i.e why revision no is 0.
3550#sh vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs : 27
VTP Operating Mode : Server
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
*omit
3550#
3550#sh run
Building configuration...
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We have a VTP domain in which all switches are in transparent mode. However, several have the wrong domain name or mode. As a result, some errors are being displayed in the log. I would like to change the VTP configuration in those switches. They are all in a production network. Which would be the best way to do it without causing problems to the network?
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Posting
You write, all switches are in transparent mode, but also regarding those in server mode - i.e. which is it?
"Safest" would be to switch a server (or client) mode switch to transparent before changing domain name. If you switch domain name first, yes you expose having shared VLAN information changed.

Move a switch from VTP client mode to VTP transparent mode

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