VTP Advertisements

VTP advertisements can occur in three forms:

1. Summary advertisement
1. every 5 minutes
2. information included
1. VTP version
2. domain name
3. configuration revision number
4. time stamp
5. MD5 encryption  hash code
6. number of subset advertisements to follow
3. Subset advertisement
1. sent after VLAN configuration changed.
2. information included:
1. VTP version
2. Subset sequence number 
3. domain name
4. configuration revision number
5. VLAN info field
2. Advertisement requests from clients
1. VTP client can request the VLAN information it lacks.

CCNP SWITCH 642-813 I\Official Certification Guide