Converting VTP transparent to Server

Here's the issue. I have 4 switches currently and I am adding 3 more. Each switch is setup for VLANS but in VTP Tranparent mode. I would like to make one of the switches a VTP server and then make the others clients so I no longer have to make the changes on each switch.
My Question is, will I lose the currently VLAN config when changing from transparent to server?

No, you wont be losing the VLANs when changing from Transparent to Server mode.
Please be extra careful when changing VTP modes and pay close attention to configuration revision # and make sure there's not another server out there because by default all switches are in Server mode.
HTH,
Sundar

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VTP Transparent Mode in 2924XL/3524XL

I have a 2924XL ver12.0(5)WC11 connected to two 3550 ver12.1(22)EA5 via 802.1Q trunks. They are all in the same VTP domain. The 2924XL is in VTP Client mode & the two 3550s are in VTP Server mode. There are only 6 vlans - 1, 223, 1002, 1003, 1004, & 1005. I am attempting to change all switches to VTP Transparent mode.
Starting w/the 2924XL, when I change mode from VPT Client mode to VTP Transparent mode, the interfaces w/the trunk links immediately bounce & when they come back up, communication is only established thru VLAN1 & am no longer to communicate to devices in VLAN223.
Connection was restored when I reconfigured the 2924XL back to VTP Client mode.
What is causing this problem & what is the proper way to convert to Transparent mode w/o interruption of service?
Thanks!

Humm ...
well, please help me to understand the problem.
The VTP Client saves the vlan infos in RAM, and not in NVRAM like VTP Server ... when you change the VTP mode Client to Transparent, why you lose you vlan infos?
If you do a "sh vlan" on one of your switches that is in client mode, then change it to be in transparent mode, none of them would disappear.
It will simply stop listening to vtp messages regarding the creation and deletion of vlans.
Then, of course, you have to create the vlan database in NVRAM ...
Thanks for your support
Regards
Andrea

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
thanx

here is the configuration as per your request
version 12.1
service nagle
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
service linenumber
hostname ccr6switch1
logging monitor notifications
aaa new-model
aaa authentication login default local
ip subnet-zero
no ip source-route
no ip gratuitous-arps
ip domain-name netdev.aau.edu.et
ip name-server 10.6.10.22
ip name-server 10.5.10.22
ip name-server 10.4.10.22
ip dhcp-server 10.6.10.100
vtp domain aau
vtp mode transparent
vlan 6
name 4kthin
said 10006
vlan 7
name 5kthin
said 10007
vlan 8
name thinclient
said 10008
vlan 9
name Multi
said 10009
vlan 10
name SSserverFarm
vlan 13
name ccr6_1
vlan 14
name ccr6_2
vlan 15
name ccr6_3
vlan 16
name ies1
vlan 17
name ies2
vlan 18
name sisa6switch1
vlan 19
name bued6switch1
vlan 20
name ken6switch1
vlan 21
name ken6switch2
vlan 22
name law6switch1
vlan 23
name reg6switch1
vlan 24
name ier6switch1
vlan 25
name glib6switch1
vlan 26
name idrl6switch1
spanning-tree extend system-id
no spanning-tree vlan 6
no spanning-tree vlan 7
no
no spanning-tree vlan 19
interface FastEthernet0/1
description from ccr6switch2
switchport trunk allowed vlan 1,11-15,300,301,1001-1005
switchport mode trunk
no ip address
interface Vlan1
ip address 10.1.0.6 255.255.255.0
no ip redirects
no ip redirects
no ip proxy-arp
no ip route-cache
ip default-gateway 10.1.0.2
ip http server
^C
AND THE SOFTWARE VERSION IS
IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(9)EA1, RELEASE SOFTWARE (
fc1)

VTP transparent mode and using VTP domain

                   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?
thanks
mahesh

Mahesh,
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.
So Sw1(Server-CCIE Domain) <-------> Sw2(Transparent-CCIE Domain)  <-------> Sw3(Client-CCIE Domain)
The above will work because the Transparent switch is in the same domain. This means that SW3 will get any Vlan changes that are done on SW1.
Now lets look at it the other way.........
Sw1(Server-CCIE Domain) <-------> Sw2(Transparent-Null Domain)  <-------> Sw3(Client-CCIE Domain)
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2) If you are dynamically negotiating trunks, this will never happen due to the mismatch domains. Meaning that your trunks will never come up because you did not put your Transparent switch in the same domain.
Kiel Martin

Best Practise for VTP Transparent?

When I configure Cisco switches unless there is a specific reason to use VTP (legacy network) I would normally configure VTP Transparent (or if its a recent CatOS switch disable VTP). I understand Server, Client & Transparent concepts but was wondering about the VTP Domain Name when using Transparent mode.
I would normally configure VTP Transparent before anything else on the switch but don't configure a VTP Domain Name:
cat-2950#sho vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 250
Number of existing VLANs : 8
VTP Operating Mode : Transparent
VTP Domain Name :
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x73 0xC8 0xF8 0x2C 0xB1 0x67 0xB6 0xC4
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
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Andy

Yes you can create VLAN's without a VTP domain name and in Transparent mode, or at least on Catalyst IOS you can.
The issue I was thinking of was when you take a vanilla switch and connect it to an existing switch with a trunk and the new switch inheriting the VTP domain name and vlan database. For example if I configure up a 2950 as a VTP server with a domain name of VTP and then create VLAN's 10, 20 & 30. If I then take an unconfigured 2950 (or one that has had the configuration erased and the vlan.dat file removed) and put a cross-over cable between them, an 802.1q trunk link will be formed and the 'new' 2950 will inherit the VTP domain name VTP and the vlan database containing VLAN 10, 20 & 30.
Will the VTP domain name be inherited if the switch was set to Transparent before it was connected?
Andy

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user559432 wrote:
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Move a switch from VTP client mode to VTP transparent mode

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Hi there,
The VTP and the VLANs are seperate beasts.
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LH
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hey .. funny how expert opinions vary ... i have a handfull of IT and software RAID experts who disagree with you ... in my case, i'd rather get rid of it ... ( however i still have to find a solution to clone my boot drive that works flawlessly with all my software ... )
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<Edited by Moderator>

VTP change from server mode to transparent mode

Hi,
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?
Regarding the switches which are in mode server and have a wrong domain name, should I change firstly the mode to transparent and then the domain name? Is there any risk of losing the vlan configuration?
Thanks in advance.

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The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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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.

5505 stuck in VTP transparent

I have a 5505 that refuses to change VTP mode to anything other than transparent. It acts as though it has taken the change, but when you show vtp domain, it shows it as back in transparent mode. The VTP server is a 2924, and there is another 5505 in the network as a client(Which occasionaly slips back to transparent, but takes the change back to client). The only difference between the two 5505s is a slightly older COS on the one that is stuck in transparent ( 6.3(5) vs. 6.4(17) ). Due to the fact that the switch is in heavy usage and they take a while to bring back up, I can't randomly play with it unless I'm fairly sure I've found a solution. There are around 150 VLANs in the database. The server is running VTP V1(as is the 5505 in question). The 5505 does not show any other signs of failure, it's been rock solid otherwise. It's just getting to be a pain having to enter VLAN changes in on 2 switches instead of one. The domain name is the same. I can't find anything in the Cisco release notes that ever shows this as a known problem.

The vtp server should not be the 2924 which may be your problem . These will only support like 64 spanning tree instances so anything above that means spanning tree is not working for those vlans . The 2924 should be a client and you should manually prune the connecting links of vlans that are not needed on the 2924 . Always use the more powerful box as the server . Make the 5500 the server . Below is some info from a cisco webpage.
upported STP Instances
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The Catalyst 2912 XL, Catalyst 2924 XL, and Catalyst 2924C XL support only 64 STP instances and 64 VLANs. All other Catalyst 2900 XL switches and all Catalyst 3500 XL switches support 64 STP instances and 250 VLANs.
Each VLAN is a separate STP instance. If you have already used up all available STP instances on a switch, adding another VLAN anywhere in the VLAN Trunking Protocol (VTP) domain creates a VLAN that is not running STP on that switch. For example, if 250 VLANs are defined in the VTP domain, you can enable STP on 64 of those VLANs. The remaining VLANs must operate with STP disabled.
You can disable STP on one of the VLANs where it is running, and then enable it on the VLAN where you want it to run. Use the no spanning-tree vlan vlan-id global configuration command to disable STP on a specific VLAN, and use the spanning-tree vlan vlan-id global configuration command to enable STP on the desired VLAN.
For more information about VLANs, see "Configuring VLANs."

Want to convert function in SQL Server 2000

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Converting VTP transparent to Server

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