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VTP transparent mode not working correctly

dariopalermo
Level 1
Level 1

3 switches: A <--> B <--> C

all ports are configured as static trunks with only 2 allowed vlans (734 and 834)

VTP Version 3, all the switches have correct domain and password.

Switch B is a bit old, so has the 255 max vlan limit and my vlan database has over 400 vlans in it.

When i set switch B to VTP Client mode, the VLAN Manager revert it to transparent mode because of the vlan max limit.

The issue is with switch C: it's not getting the vtp data. It is sending requests, I can see enabling the debug sw-vlan vtp packets and events but switch B seems to receive and/or transmit just nothing.

Pruning is disable everywhere.

I reproduced this situation in my lab with similar switches and got the same issue. In lab, changing switch B with a different model (I used a cheap SF302-08P) solves the issue.

Last thing to test would be reducing the vlan number under 255 to let switch B go into client mode and see if then switch C gets the data.

Switch B is a WS-C2960-24PC-L with IOS 15.0(2)SE10 (also tried SE8).

Any ideas?

2 Replies 2

sarathpa
Level 1
Level 1

Could you please try by enabling pruning  on the vtp server switch.

I enabled vtp pruning on the server, like you suggested. No changes. I also pushed again switch B into client mode but the vlan manager is again reverting to transparent and sw. C still doesn't receive anything.

Best regards

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