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

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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)
Two things are going to happen here
1) The transparent switch is not on same domain, so SW3 will never get any updates when changes to Vlans are done on SW1. So if I add one vlan to SW1, and that make the Configuration Revision increase to the value of 10, that means SW3's Revision will still be 9, and will remain that way until the issue is corrected.
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

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
Please rate all posts

Nexus 9396PX support only with VTP transparent mode

Why Nexus 9396PX not support vtp server and client mode ?
We are using with 6.1(2)I3(2) version.
Thanks.

Is any expert out there who can answer my query ?. Much appreciated.

The difference between VTP server and transparent mode on Catalyst Switch.

Hello
I have a question about the difference between VTP server mode and VTP transparent mode on general catalyst switch.
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.
[VTP Transparent mode]
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
[VTP Server mode]
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,
Masanobu Hiyoshi

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...
*no VLAN like above configuration on VTP transparent mode.
This indicates that vlan never created in server mode nor learnt from another switch as revision no is 0

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

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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
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ip subnet-zero
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no ip gratuitous-arps
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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
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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
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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.

Disclaimer
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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.

VTP v2 Transparent mode forwarding

All,
As part of my recertification, i am studying VTP (again) and i ran into the following question:
I know VTP v1 switches in transparent mode only forward VTP advertisements if the domain name is the same and if the version is the same (so only v1 gets forwarded and only if the domain name matches)
I know VTP v2 has a feature called: version-independent forwarding: a VTP v2 transparent switch will forward VTP v2 packets as well as VTP v1 packets.
BUT what about the domain name ? Does it still need to match ?
Will a VTP v2 Transparent Switch in domain "Cisco" forward a VTP v1 or v2 advertisement of domain "TEST" ???
regards,
Geert

Ok. Thx. Let us believe the documentation.
Although it is not really clear why this feature is called "version dependent transparent mode" and not "version independent transparent mode". To me it seems more logical - since it forwards v1 and v2 - to be version independent...
So in the following situation:
SW1 ---- trunk --- SW2 ----- trunk----- SW3
Server Transparent Client
VLANS 1,2,3
Domain TEST Domain Cisco Domain TEST
If SW2 is running VTP v1 --> SW3 does not know any VLANs
If SW2 is running VTP v2 --> SW3 does see VLANS 1,2,3
Geert

ASR5k transparent mode

Hi,
in order to configure transparent mode in ASR5k to disable authentication and to allow everyone what is the appropriate commandso co
in SAMI module we used used to configure 'access-mode non-transparent' under the APN
what is the equivalent in ASR5k?
we have configured the following 2 commands and we still have authentication failure for the GTP user
aaa authentication subscriber none
apn {apn_name}
authentication allow-noauth

Hi,
If you use transparent instead of server or client, there should be no problem wit copy run start. (The difference is that in this case your switch doesn't participate in the VTP communication, only forward the received messages and doesn't update its vtp db).
During the copy running-config startup-config did you get some error message? (not enough space or something) PLease first check the flash with the show flash command.
Or try to save your running to flas not to startup config: copy running flash:test.cfg
If you need more help please send me output of show flash at least...
bye
FCS
Please rate me if I helped.

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

Transparent Mode - running-config are not saved to Startup-config, Normal ?

I config a switch to be a Transparent Mode, then I issue the copy run start command, then I issue the show start-up command, however the Running-config is not copy to the start-up config
Is it Normal for the switch ???
vtp mode transparent
int fa0/1
switchport mode access
switchport access vlan 5
int fa0/2
switchport mode access
switchport access vlan 6

Hi,
If you use transparent instead of server or client, there should be no problem wit copy run start. (The difference is that in this case your switch doesn't participate in the VTP communication, only forward the received messages and doesn't update its vtp db).
During the copy running-config startup-config did you get some error message? (not enough space or something) PLease first check the flash with the show flash command.
Or try to save your running to flas not to startup config: copy running flash:test.cfg
If you need more help please send me output of show flash at least...
bye
FCS
Please rate me if I helped.

Cisco 2960S Configured in Transparent mode

I have a Cisco 2960S gig switch configured in transparent mode with multiple vlans configured. I have printers that I can ping, the ports shows up but on the printer it says offline. Any idea what could be causing this?

If your printer and your PCs are all in the same subnet and only the printer is not working then VTP mode Transparent has nothing to do with your issue.
I'd be keen to know if you have a firewall blocking anything from the IP address of the printer? Maybe the IP subnet mask or default gateway of the printer is not working?
What do you get when you do a "sh mac-address interface <PRINTER port>"?

CISCO SWITCH IN TRANSPARENT MODE

hello everyone,
i have a 2960 compact switch. i wanted to know whether its possible to make this switch transparent. the requirement is that whenever the switch is connected to any lan, it should be able to access the lan without any configuration being made.

No it is not at all dumb.
Transparent mode means the switch does not learns vlans using VTP.
it will just pass vlan tagged packets even for vlans it does not "know".
but then again, where must the switch send it to?
your options are
- trunk port with all vlan allowed
- access port with configured access vlan (but then the vlan must be known)
As john allready pointed out most attached devices need connection to an access port
or they must be able to process vlan tagged packets themself and be attached to a trunk port
a partial solution is
- configure one port as a vlan trunk (connected to another trunk port)
- for every vlan configure a number of ports as access port
if you have sufficient ports you may configure a number of ports in each of the vlans (you mentioned 12 ?)
Your limitations are the vlans you configured and the number of access ports configured for each vlan.
eg a 48 (+1 uplink) port switch with 4 ports in each vlan.

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
You create an STP instance when you assign an interface to a VLAN. The STP instance is removed when the last interface is moved to another VLAN. You can configure switch and port parameters before an STP instance is created. These parameters are applied when the STP instance is created. You can change all VLANs on a switch by using the stp-list parameter when you enter STP commands through the CLI. For more information, refer to the Catalyst 2900 Series XL and Catalyst 3500 Series XL Command Reference.
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."

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
Are there any issues with not configuring a VTP Domain Name?
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

VTP Transparent Mode in 2924XL/3524XL

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