Decommissioned Switch in a VTP domain exam question.

[surfbum99]

Hi there,

I had an CCNA exam question where the scenario is a VTP domain with several switches. They are you if a switch has a hardware fault what happens when it goes offline to be fixed? What happens to the VLANs if it was a server. Also what happens to the VLANS when its fixed and it gets back online.
Does anyone know what happens say to VLANS A,B,C if a VTP Server mode goes offline? What happens to the other switches?

Alistair.

 

[KiscoKid]

Depends on the VTP revision number of the VTP server in question.

If it comes back online again with a higher revision number than any of the other pre-existing VTP servers, its VLAN info will be propogated to all the VTP servers and clients in the domain - which may cause an issue.

If it has a lower VTP revision number of just one of the pre-existing VTP servers, there should be no effect and it will simply copy the VLAN info from this other server with a higher revision number.

Cisco usually advise to black the VLAN info of any VTP server you want to introduce to a switched network by erasing the configuration and then power cycling the switch in question.