Cannot delete VTP domain on 2950

I want to delete the VTP domain name on my 2950.
Sh VTP Status display :
VTP domain : CACE
VTP mode : transparent
Try to use command line vtp domain "" and having this message
Operation failed; Bad domain name length
What is the way to set a null domain name ?

Hi Friend,
The easiest way is to give it some other domain name which does not exist in your network if you do not want your switch to participate in any VTP domain which exist in your network.
Switch default is in no-management-domain state.
After the switch leaves the no-management-domain state, it can not be configured to re-enter it until you clear the NVRAM and reload the software.
So if you completely want to get rid of it clear NVRAM and reload the software.
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12120ea2/3550cr/cli3.htm#wp1878369
By my recommendation is if you put into any domain which does not exist in your network it is same as no-management-domain state because it will not participate in your existing VTP domains.
HTH, if yes please rate the post.
Ankur

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More than likely, you are using a switch like the 2950, 3550, etc. that holds its VTP information in a vlan.dat file. This file is separate from the startup-config file. Just modify the VTP domain name and add the VTP password (you do have one right?). The switch should get vlan information across its trunk ports (assuming the trunks are up and hard-coded on). The VTP mode can be changed before or after this happens.
BTW, since the VTP information is stored in the vlan.dat file, when you erase the startup config and reload the switch, the VTP domain and mode will still be there (until you delete the vlan.dat file and reload).
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Bridging betweteen different vtp domain

Can I bridge same vlan in different switch (2950 -- 3750 -- 2950) since each switch is consist of different vtp domain?
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Hi,
Yes, You can bridge on the same vlan between diff switches. If you have diff VTP domain, your VTP advertisements will not travel to the switch with diff VTP domain and you will lose the Vlan consistency on your LAN. Moreover if you want same number of VLANS then you have to define them manually. If you have a trunk between the switches in diff VTP domain, set the trunk to on as the trunk doesnot negotiate between the switches in diff VTP domain and trunk doesnot get established.
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VTP domain change

Hi,
Our network runs in one VTP domain. All switches are Cat6500 (ISO) sup2 or sup720. All is working in Layer 2.
We are using vlans above 1000 which cannot be propagated by VTP and needs to be configured by hand on every switch. We changed the VTP domain so every 6500 switch was its own VTP domain and then trouble started ... something strange occured. The MAC addresses were not propagated to other switches in vlan (layer 2 only vlan). Putting static entries did not solve the problem. The MAC addresses in the same VLAN were only propagated from access1(VTP access1) to core1(VTP core1),but not to the access2 (VTP access2). Same thing the other way.
On switches that we didnt change vtp, everything worked fine. After couple of hours trying to solve the problem, I changed back to same VTP domain for all switches and MACs starts propagate.
What was cousing this problem ?
Thanks and regards:
Michal

VTP doesn't know propagate advertisements outside the vtp domain. It, rather maintains information consistency between the switches in the same vtp domain through the trunk links.
Configuring different vtp domain is the same as isolating each switch in a domain.
PS:
"You can use VTP to manage VLANs 1 to 1005 in your network. (Note that VTP does not support
VLANs 1025 to 4094.)
When you make a change to the VLAN configuration on a VTP server, the change is propagated to all
switches in the VTP domain. VTP advertisements are transmitted out all trunk connections, including
Inter-Switch Link (ISL), IEEE 802.1Q, IEEE 802.10, and ATM LAN Emulation (LANE).
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The following global configuration information is distributed in VTP advertisements:
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VTP domain name
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Frame format
Please rate if it helps
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4503 VTP Domain Name

I have a lab that consists of 2 - 4503 with SUPII running cat4000-i9s-mz.122-25.EWA14.bin as the core devices. I have been practicing for the BCMSN test and was working with the different VTP confiuration options. Here are the two issues that I am having. One of which from reading other posts, I may have answered, but want to verify.
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     Switch#sh vtp status
VTP Version                     : 2
Configuration Revision          : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs        : 5
VTP Operating Mode              : Transparent
VTP Domain Name                 : null2
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Enabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0x10 0x14 0xFD 0x3C 0x2C 0xD2 0xFC 0x4C
Configuration last modified by 0.0.0.0 at 3-1-93 01:19:35
Any help would be appreciated
Thanks in advance.

I have a lab that consists of 2 - 4503 with SUPII running
cat4000-i9s-mz.122-25.EWA14.bin as the core devices. I have been
practicing for the BCMSN test and was working with the different VTP
confiuration options. Here are the two issues that I am having. One
of which from reading other posts, I may have answered, but want to
verify.1- 4503 (Core_1) was configured as Server, but no VTP
summary advertisements where being propegated to the other clients. I
verified the configuration multiple times to ensure accuracy. All VTP
Domain names where empty (factory default). Not until I changed the
VTP Domain name to Test, did I get propegation of vtp advertisements.
I have in the past been able to set up vtp on 3550, 3560 switches with
no VTP Domain name and VTP worked as expected. From reading, it
appears the non propegation of vtp summary advertisements is the norm
for 4503. Can someone verity this.2-
How do you remove the VTP Domain name from the 4503? I was able to
remove the name from the other devices, 3550, 3560 by doing the
following:     del flash:vlan.dat      wr er      reload     On the 4503 I did the following:      Switch#del /r /f cat4000_flash:vlan.dat      reload
After reload, everything was back. I also assumed when the 4503 was
booting, it may have recieved the VTP information from the other 4503.
So I isolated both by disconnecting the uplinks to all other devices.
Still no go. I have copied the start-up config to a tftp server,
modified the config by removing all vtp information then copied back to
running-config and this worked. But it seems like there should be a
better (easier) way of getting the vtp domain name removed on a 4503     Switch#sh vtp statusVTP Version                     : 2Configuration Revision          : 0Maximum VLANs supported locally : 1005Number of existing VLANs        : 5VTP Operating Mode              : TransparentVTP Domain Name                 : null2
Hi,
Deleting the vlan.dat from cisco switches will delete the complete vlan and vtp information from database and if you are not able to delete the domain name in these type of situation try configuring the some bogus name with mode as transperent mode so that other should not get impacted.
check out the below link for more information
http://www.ciscosystems.com.ro/en/US/docs/switches/lan/catalyst4500/12.1/12ew/configuration/guide/vtp.html#wp1029449
http://www.cisco.com/en/US/tech/tk389/tk689/technologies_configuration_example09186a00807d5d42.shtml
Hope to Help !!
Ganesh.H
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