VTP server and vtp client vlan information question

[fly]

Hi Dear ALL,  

    i have serval vtp questions.

    1.if vtp prunning downstream switch,  Does vlan information still exist on downstream switch, or prunning vlan information are deleted.

     2.if vlan information update to another vtp server/client, does this new vlan information saved automactilly into NVRAM?????

    2, if one new switch add to network, revision number is higher, the whole vlan information are refreshed by this switch,  we remove this new switch. does I need to reconfig all vlan information on vtp server? can we just reboot old vtp server to recover?

    thank you!

   Jun Li

[Eugene Khabarov]

1. No, it is not exist on downstream switch.

2. It is saved to vlan.dat what can be stored on flash.

3. Yes, you need to reconfigure it again. Reboot will not be helpful.

_

HTH. Please rate this post if it was helpful. If this solves your problem, please mark this post as "Correct Answer"

[cadet alain]

Hi Eugene,

1. No, it is not exist on downstream switch.

VTP pruning doesn't change the VLAN database on switches it just refrains from sending frames on trunk for VLANS that don't exist at the other end of the links.

Regards.

Alain.

[Eugene Khabarov]

Ok, Alain. You right here.

[Latchum Naidu · Accepted solution]

Hi,

1.if vtp prunning downstream switch,  Does vlan information still exist on downstream switch, or prunning vlan information are deleted.

VTP prune is a feature to set of the vlans only can transfer on the trunk link. And it will not change the VLAN database.

2.if vlan information update to another vtp server/client, does this new vlan information saved automactilly into NVRAM?????

If any client get update from VTP server that update will get update in the client vlan.dat file.

2, if one new switch add to network, revision number is higher, the whole vlan information are refreshed by this switch,  we remove this new switch. does I need to reconfig all vlan information on vtp server? can we just reboot old vtp server to recover?

If you removed removed the existing VTP server and looking to bringing up the old VTP server then you need to configure all the required vlans in the new VTP server.

Please rate the helpfull posts.
Regards,
Naidu.

[Kishore Chennupati]

latchum,

check your private messages mate.

[Latchum Naidu]

Done Kishore.....

[Kishore Chennupati]

Latchum,

2, if one new switch add to network, revision number is higher, the whole vlan information are refreshed by this switch,  we remove this new switch. does I need to reconfig all vlan information on vtp server? can we just reboot old vtp server to recover?
If you removed removed the existing VTP server and looking to bringing up the old VTP server then you need to configure all the required vlans in the new VTP server.

umm. lets say the new vtp server gave out vlan 10, vlan 20, vlan 30. and the old vtp server  had vlan 40, vlan 50.

once the new vtp server is taken out and the old one is plugged back into the network. what happens to the vlan.dat on the client swiches  then?

if you can explain that will be good .I would interested to knwo as well.

Regards,

Kishore

[Latchum Naidu]

Kishore,

I have not simulated it yet but I think the vlan.dat file will be changed with the new vlan database when the new vtp server come online.

Please rate the helpfull posts.
Regards,
Naidu.

[fly]

i think when old vtp server is  plugged back to network, the revision number of switch on network currently is higher than old vtp server, the old vtp server will be refreshed by switch on network. if there is no vtp server on network, vtp client can also refresh old vtp server

another question , if vlan information is saved in config file ,not in vlan.dat.  will  these vlan information be refreshed by vtp server and auto saved in config .

i rememeber vtp just only refresh 1-1002 vlan , not above it.