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).
VTP servers advertise their VLAN configuration to other switches in the same VTP domain and
synchronize their VLAN configuration with other switches based on advertisements received over
trunk links. VTP server is the default mode.
Each switch in the VTP domain sends periodic advertisements out each trunk port to a reserved multicast
address. VTP advertisements are received by neighboring switches (in the same domain), which update their VTP and VLAN
configurations as necessary.
The following global configuration information is distributed in VTP advertisements:
VLAN IDs (ISL and 802.1Q)
Emulated LAN names (for ATM LANE)
802.10 SAID values (FDDI)
VTP domain name
VTP configuration revision number
VLAN configuration, including the maximum transmission unit (MTU) size for each VLAN
Frame format
Please rate if it helps
Regards
M. BEN HASSINE

Similar Messages

VTP domain name change

we have a number of campus LANs that for historical reasons, all have the same VTP domain name (even though they are seperate domains).
we'd like to change the domain names so that they are unique throughout the network. is the correct method of acheiving this:-
1 change VTP server to Transparent Mode
2 change VTP domain on 'server' to new domain
3 change all Client switches on campus to Transparent mode and change domain name to new one. change mode back to Client and then restart.
any advice appreciated
thanks
andy

Hi Andy,
I believe you have 2 VTP servers in your network with different VTP domain names and both VTP servers are playing role seperately for their VTP domains? Correct me if I am wrong?
If I am right you can go ahead with your plan and change your one VTP server which you waan sync with your other VTP server to transparent mode and then chage the VTP domain name then change it back to server mode so that you can also have 2 VTP servers in same VTP domain for any emmergency.
Talking about clients you can follow the same procedure as changing from client to transparent, then change the domain name and then back to client and you need not reload your switches.
Also remember while doing all these when you move your one VTP server and clients to different VTP domain name the VLAN information will get override by VLAN information persisting on your other VTP server and if this is what you want just go ahead.
Devang I did not undersood your BPDU stuff in this context can you please throw more light on the same.
Regards,
Ankur

Effect on switchports of changing vtp domain

I have three switches in a single VTP domain (I actually have lots but 3 will be for this example) A and B are vtp servers C is a client.
I creat a VLAN100 on one switch A, this is propagated to the other switches. I set a port on C to be in VLAN100. I them put switch B and C in a new VTP domain and create VLAN100 in this domain.
Question - Does the switchport on switch C continue to operate on the new VLAN100 within the new VTP domain?

Thanks for the post, I have looked at this and a number of other cases where people are trying to bring two VTP domains together. In these cases the VTP sync works. What I am trying to do is break a single vtp domain into several smaller ones with layer 3 links (rather than layer 2 trunks) between them. To keep my users downtime to a minimum I would like to preconfigure as much as possible, i.e. create the VLAN's and set the switchports, then change the VTP domain. Does a VLAN have a "magic number" which is specific to a VTP domain or will the VLAN port config work properly on the new domain.
It could be that I am being overly concerned here and that everything will "just work" but I have 600 users, data and voice, who will be down if it goes wrong!!

Change VTP mode from Client to Server in a production VTP Domain

Dear all,
we have a production VTP Domain with some switches acting as VTP Client and 1 as a VTP Server. now the master is dead, and we would like to change the mode of one of the remaining switches from VTP Client to VTP Master. IMHO this change should not have any impact on the current configuration of the switches (and on the VLAN database), but we would like to have your opinion about this.
Any help/feedback will be greatly appreciated
thank you

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Posting
That should be fine. The real difference between a VTP server vs. VTP client, the former allows (manual) VLAN configuration changes and the latter doesn't.

Vtp domains

we have two vtp domains in our hosp. I have a switch I would like to share between the two. Have some ports vlaned to a network defined on one vtp domain and others to the others to a network on the other vtp domain. This should work right? with the management ip only on one vtp domain network.

That should work OK provided none of the VLANs overlap. Make sure the switch is in VTP transparent and define the VLANs locally on it. Make sure the trunks only allow the VLANs that are relevant to the domain they are talking to. I would also change the VTP domain name so that it matches neither existing name, just for safety.
Kevin Dorrell
Luxembourg

Ciscoworks Topology VTP Domains

Hi
I've tried searching the community, but no luck finding a solution that works for me.
The problem is that I have 2 VTP domains, they both shows up in Topology, VTP Domains. But one of the doesn't show the VTP Transparent devices. The other does. Ciscoworks discover all the devices, bot VTP Domains consists of server/client and transparent. All switches in the VTP domains, are configured with the same values for snmp, user, tacacs and enable secrets. One switching environment has the domainname IDMZ and the other has YDMZ. YDMZ shows all devices under VTP Domain views in Topology, but IDMZ does not. I can see the devices under unconnected device view, and there I see them connected and looking good. The VTP are configured correctly, except transparent for those not showing up under VTP Domains for IDMZ.
Any ideas, what tp look for?
I'm running the latest version of Ciscoworks (4.0).
Br
Geir Sand-Strand

I think I found the problem. The transparent switch had wrong snmp config (v2).
Changed this and now it seems to work.
Geir

VTP Domain question, collapsed Backbone

Hi All,
I have to redesign our network.
Reading lots of books, there are still questions...
Suppose I have a classic collapsed backbone with a Server farm and a access layer for the users.
The server will be in one VLan (= /24 subnet), the users in multiple other VLans.
Are the Server farm and the User Vlans in the same or in diferent VTP Domains?
Is it at all possible to have multiple VTP domains in a collapsed Backbone?
Thanks
Willem

A switch can only be part of one VTP domain at any given time, however, you can have multiple VTP domains in your network. As the previous post states, VTP is used to manage VLANS. So, if you have VTP Domain A, switches that are part of that VTP domain will monitor VLANs associated with VTP Domain A. Switches in VTP Domain B will monitor VLANs associated with VTP domain B.
The main purpose of VTP is to keep you from manually having to configure the same VLANs on a bunch of switches. Depening on the size of your network and how often VLANs change, it may or may not be worth using VTP.
If you do use VTP, be careful if you are changing parameters in a live environment...you can lose all of your VLANs...I've done that before and it wasn't fun.

VTP domain disconnect

Hi All.
I have Cisco LMS 3.2.1 at a Customer site, he was checking discrepancies and received an "VTP disconnect message".
The network has a VTP server which is 6509 switch connected via Trunk to all switches.
Can anyone throw me a direction in which we can look here?

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).
VTP servers advertise their VLAN configuration to other switches in the same VTP domain and
synchronize their VLAN configuration with other switches based on advertisements received over
trunk links. VTP server is the default mode.
Each switch in the VTP domain sends periodic advertisements out each trunk port to a reserved multicast
address. VTP advertisements are received by neighboring switches (in the same domain), which update their VTP and VLAN
configurations as necessary.
The following global configuration information is distributed in VTP advertisements:
VLAN IDs (ISL and 802.1Q)
Emulated LAN names (for ATM LANE)
802.10 SAID values (FDDI)
VTP domain name
VTP configuration revision number
VLAN configuration, including the maximum transmission unit (MTU) size for each VLAN
Frame format
Please rate if it helps
Regards
M. BEN HASSINE

Vtp domain info in startup????

Cisco sent my client a replacement switch. Event though my client sent the startup config to the new switch it still defaults to Server and has no domain info. Is this because Client mode VTP info is volatile? The startup config of the Server will retain VTP info???????
But the startup of the Client mode will not???????? We are now concerned for our VTP info in the event of hardware failures of disasters. I instructed my client to send a running config to the new switch and see what shakes.

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).
HTH.
Eugene

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

Separating a VTP domain

Hello,
I'd like to know if we change a vtp client switch from VTP domain "a" to vtp domain "b" (VTP domain "b" currently not existing) if he will keep his vlan database and then can be turne to vtp server for domain "b" and propagating the vtp domain "a" learned vlan to his vtp domain "b" clients switches ? And of course then create new vlan for his domain.
Thanks

Hi Sancy,
If the switches are configured for vtp client and you reload the switch it will loose all the vlan information.
In VTP client mode, VLAN configurations are not saved in NVRAM
In VTP server mode, VLAN configurations are saved in NVRAM.
Regards,
Ankur

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.
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 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
Remember to rate the helpful post

Cat4000-IOS not seen as member of its own vtp domain in CM

Recently we upgraded to CiscoWorks CD 5 V1. Cat4000-IOS devices are now supported in RME and CM. But in CM Topology Services the Cat4000-IOS devices are not seen as members of their own VTP domain. Instead, each access switch behind the Cat4000-IOS forms a single switch cloud (vtp disconnected domain) and no vtp server is found for that domain.
The two Cat4000-IOS serve as VTP servers and HSRP-Gateways for five access switches (Cat4000 with CatOS) connected via dot1q-trunks to each Cat4000-IOS.

I am having the same problem. I followed the link and the document says "A link in a VTP domain is not set to trunk. There are devices in this domain that do not communicate through any trunk." I have checked the devices and they are set up to trunk. In CiscoWorks - topology services, when I run a Logical Discrepancy Report It says the domain is disconnected and it is showing 15 sets. Set one shows my two 6509's, one 4006 & all of the 3524's connected to it. All of the other sets have only one 3524 in each of them. The trunk ports from two of my 4006's to my 6509's are as follows:
interface Port-channel1
description Uplink to C_BCAD_2213_6x_1
switchport
switchport trunk encapsulation isl
switchport mode trunk
no snmp trap link-status
On one of my other 4006's the trunk port is as follows:
interface Port-channel4
switchport
switchport trunk encapsulation isl
switchport mode trunk
description Uplink to C_BCAD_2213_6x_1
no snmp trap link-status
As you can see, they are both set up the same.
Also in Campus Manager, only the 4006 in set 1 & all of the 3524's show up graphically as clients. The two 6509's show up as servers.
All devices are running VTP version 2. The revision number on all devices is the same (10).

Importance of Certification for Domain Change

Hi,
I have two years experience in development in .Net technologies in a reputed MNC. After that I took a break for personal reasons and now am planning to get back into the industry. During that period of work, i had taken part in a "boot camp" carried out by my company itself in SAP PI/XI 7.1, which perked a lot of interest in me towards SAP. Domain change, unfortunately, was not encouraged in my company, at least at my level.
I am now looking forward to doing Certification in a SAP module. I have a few questions.
1. Even though I have coding experience, will I be counted as a fresher, since it is not in SAP technologies? I think Certification is important towards improving my chances in improving my chances in securing a job as a SAP consultant?
2. I am leaning more towards functional modules than technical. My work exposed me more towards communications end, especially mobile app development, can any one suggest a good module i should look into? I liked SAP PI/XI since including a bit of coding as well, which i though would be good for me since i have experience in that domain, but some consider it as an advanced module, so I'm really not sure.
Thanks and regards,
Arnab

Hi Arnab,
1. As far as SAP is concerned, you would be considered as a fresher. However, your .net experience would be some handy. SAP Certification may help to market your CV being a fresher. At the end of day, whether you have Certification or not, you need to show case and prove your abilities in the interview.
2. Particularly, mobile technologies have good demand. You should follow the mobile technology space on SCN. There are some wonder people in this area, I am sure, they would be able to advise you in more details.
Hope this helps.
Kind Regards,
Ravi

Oracle Enteprise manager 11g has stopped working after domain change

We are currently running Oracle 11g on our environment. It was working fine until the domain change. how can i reconfigure oracle such that it can work on the new domain without uninstalling. Oracle runs on morethan eight production VM Windows 20008 R2 servers.
Url https://pmbwtpls101.inter.noncore.local:1158/em new Domain inter.transnet.net
Above is our EM url which no longer works after domain switch to inter.transnet.net.
Your assistance on this matter is highly appreciated.

Hi,
You can reconfigure the EM check this link, will help you
EMCA Troubleshooting Tips

VTP domain change

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