VTP Status Feature Unknown:

[david_e_smith]

Can someone tell me what "feature Unknown" is at the bottom of a sh vtp status below?

We have reason to believe that our VTP configuration needs some corrections. We expanded recently. Some older switches were still on VTP ver1, some on 2 and all of the new ones are ver 3. Now just one ver 2 intermediary switch remains. I think it will be retired tomorrow.

When we wanted to add a vlan, we had to put the core into transparent mode before the vlan could be created.

Not sure if this is related as well but when an intermediary 4510 is shutdown or disconnected, clients connected to the core lose connectivity. 

Thanks for any assistance.

CORE SW#sh vtp status

VTP Version                     : 3 (capable)

VTP version running             : 3

VTP Domain Name                 : our vtp domain

VTP Pruning Mode                : Disabled (Operationally Disabled)

VTP Traps Generation            : Enabled

Device ID                       : 58bf.eabe.1b40

Feature VLAN:

--------------

VTP Operating Mode                : Primary Server

Number of existing VLANs          : 17

Number of existing extended VLANs : 0

Configuration Revision            : 5

Primary ID                        : 58bf.eabe.1b40

Primary Description               : CORE

MD5 digest                        :

Feature MST:

--------------

VTP Operating Mode                : Server

Configuration Revision            : 0

--More--                           Primary ID                        : 0000.0000.0000

Primary Description             

Feature UNKNOWN:

--------------

VTP Operating Mode                : Transparent

[smitesh kharecha · Accepted solution]

Hi David,

Sounds link you have got couple of other problems apart from Feature UNKNOWN.

Not sure of your topology, so just putting my couple of points here.

1. VTP v3 is not backward compatible with VTP v2 and v1.

2. Regarding adding for VLAN; you can't add vlan to a switch which is in VTP client mode.

3. Regarding disconnection of intermidiate switch, check you STP.

PS: If you can provide topology, support forum member would be able to understand it more easily.

Regards,

Smitesh

[david_e_smith]

This.

You.

Thank you

Thank you

Thank you

The intermediate switch was acting as the root bridge for several of our VLANs. In our case it shouldn't have been. We made the core the root bridge for those vlans and we brouht all the switches up to VTP ver 3

Thanks!