vtp mode change

[suthomas1]

Hello,

I have query on changing the vtp mode and version in a live network. Core switch is on server mode and rest of access switches are on client mode.

All of these are running vtp version2.

a. If  i want to change the vtp mode to transparent for this network, will it affect the network and what will be the outage time?

b. If i change the version to version3 will there be any outage and problems?

thanks in advance!

[Rolf Fischer]

Hello,

if VTP pruning is enabled, disable it before you start to change to transparent mode. After that I'd start with the VTP clients setting them to transparent mode  and finally the VTP servers. The only problems I experienced so far when changing the mode to transparent were caused by VTP pruning, so keep that in mind. Apart from that I wouldn't expect any problems.

I've only little experience with VTP v3 but I know it's compatible to v2 and it's supported on 2k and 3k platforms starting with 12.2(52)SE and 12.2(50)SG on the 4k. Only changing the version shouldn't result in any outage, after changing the whole domain you should check the distribution of VLAN and/or MSTP configuration changes.

Hope that helps,

regads

Rolf

[sathish1212]

If u change the clients into transparent means there wont be any outage but if u change the server into transparent mode means that time clients wil be outaged ..
And vtp3 will support vtp 2 no issue on this....



Sent from Cisco Technical Support Android App

[Rolf Fischer]

sathish kumar schrieb:
(...) if u change the server into transparent mode means that time clients wil be outaged ..

Could you please explain that?

To my best knowledge, the main difference between client- and server mode is that VLANs and also some domain-wide VTP functions can only be configured in server mode and will be distributed to clients and other servers - in the case of VLANs: Adding, modifying (e.g. re-naming) and deleting.

Changing a VTP server to transparten mode means that you can't longer update the client's VLAN-information just by making changes on that former VTP server (now transparent). I can't see the risk of an outage here.

Like mentioned in my first post: I'd start with the clients from the edge to the core.

Regards

Rolf

One addition to v3:

If not already done, you'll need to configure spanning-tree extended system-id.

[suthomas1]

Our aim is to be able to use the extended vlans on our switch , which doesn't allow because of the vtp v2 and client-server mode.

So, to that effect, which will be more advisable without network outage or(least outage) :-

changing the vtp version to 3 or changing the vtp modes on all switches to transparent?

thanks for the inputs!