VLAN Trunking Protocol (VTP) is a Cisco proprietary protocol , Virtual Local Area Networks (VLAN) on the whole local area network. To do this, VTP carries VLAN information to all the switches in a VTP advertisements sent over ISL, 802.1q, IEEE 802.10 and LANE trunks. VTP is Exist on most domain of the Cisco Catalyst Family products.
Three Types:
1)Client mode : In this mode dont add and remove Vlan. It has no dabase means dont save.
2)Trnsperent mode :In this mode we add and remove vlan but only localy not in domain. It has save vlan only locally not in domain.
3)server mode :In this mode add and delete vlan in VTP domain. And also save vlan in domain.
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