Adding VLAN caused havoc

[Utair Corporation]

I had 63 VLANs in my network, with one VTP server switch and all others in client mode. Some time ago we started buying LAN-Lite versions of 2960 switches, which has 64 VLANs limit.

Just after i've added two VLANs on VTP server, random network outage problems begun. People reported random connection drops all over whole network.

After some investigation i've found what all LAN-Lite switched turend into transparent VTP mode.

Problems stopped only after i deleted some VLANs on VTP server and turned client mode on all switches back.

So i wonder, why there was connectivity problems at all? Was it inter-switch trunks stopping to work? Something else?

[Kyle McKay]

That does sound like the symptoms of a dropped STP instance - i would have to agree with above.

One other issue is if the switch has converted to VTP transparent mode while running VTP pruning. Running VTP pruning in a hybrid VTP environment is a definite no-no, however the symptoms of it should not cause "pulsing" connectivity.