We recently had a power failure on one of our 4912 Core Switches. This has happened many times in the past, but this time we lost the VLAN information in this switch. Any ideas what would cause this too happen?
I believe this switch is working as VTP client and when it got reloaded it was not able to contact VTP server and thus there was a loss in vlan information.
If this is a VTP server then vlan information sould have got saved in nvram and had not lost the vlan configuration after reload until and unless as Edison pointed there can be a corruption in vlan.dat file which is a rare chance.
Please point some more inputs what is the scenarios and "sh vtp status" from the switch.
We have seen this more than once on all the cat4000 series devices like the 4000,2980,2948's. Don't know why this happens. Never have seen it on a catos 6500 box . We have seen it on a simple reload where we had upgraded the code but it loses some of the vlan info. For some reason the 4000 series seems to be susceptible to this.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...