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9.2 | |
VTP | |
| 9.2.2 | |
VTP concepts |
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The role of VTP is to maintain VLAN
configuration consistency across a common network administration domain.
VTP is a messaging protocol that uses Layer 2 trunk frames to manage
the addition, deletion, and renaming of VLANs on a single domain.
Further, VTP allows for centralized changes that are communicated to all
other switches in the network.
VTP messages are encapsulated in either Cisco proprietary Inter-Switch Link (ISL) or IEEE 802.1Q protocol frames, and passed across trunk links to other devices. In IEEE 802.1Q frames a 4 byte field is added that tags the frame. Both formats carry the VLAN ID.
While switch ports are normally assigned to only a single VLAN, trunk
ports by default carry frames from all VLANs.
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