1). VTP works only if there is a link in trunk mode, not access mode
2). By compare the Configuration Revision, whatever it is client or server mode, it updates the neighbours when has higher revision number. And it is full update, elimates the differences.
3). VTP Advertisements
Summary advertisements
- Are sent every 5 minutes to inform the current VTP configuration revision number
- Immediately after a configuration has been made
Subset Advertisements
- Creating or deleting a VLAN
- Suspending or activating a VLAN
- Changing the name of a VLAN
- Changing the MTU of a VLAN
Request Advertisements
- The VTP domain name has been changed
- The switch receives a summary advertisement with a higher configuration revision number.
- A subset advertisement message is missed for some reason
- The switch has been reset
4). VTP Pruning
VTP pruning prevents unnecessary flooding of broadcast information from one VLAN across all trunks in a VTP domain. VTP pruning permits switches to negotiate which VLANs are assigned to ports at the other end of a trunk and, hence, prune the VLANs that are not assigned to ports on the remote switch. Pruning is disabled by default. VTP pruning is enabled using the vtp pruning global configuration command.
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