What is VTP?
VTP allows a network manager to configure a switch so that it will propagate VLAN configurations to other switches in the network. The switch can be configured in the role of a VTP server or a VTP client. VTP only learns about normal-range VLANs (VLAN IDs 1 to 1005). Extended-range VLANs (IDs greater than 1005) are not supported by VTP.
VTP Overview
VTP allows a network manager to makes changes on a switch that is configured as a VTP server. Basically, the VTP server distributes and synchronizes VLAN information to VTP-enabled switches throughout the switched network, which minimizes the problems caused by incorrect configurations and configuration inconsistencies. VTP stores VLAN configurations in the VLAN database called vlan.dat.
Two Switches
In the figure, a trunk link is added between switch S1, a VTP server, and S2, a VTP client. After a trunk is established between the two switches, VTP advertisements are exchanged between the switches. Both the server and client leverage advertisements from one another to ensure each has an accurate record of VLAN information. VTP advertisements will not be exchanged if the trunk between the switches is inactive.
Benefits of VTP
You have learned that VTP maintains VLAN configuration consistency by managing the addition, deletion, and renaming of VLANs across multiple Cisco switches in a network. VTP offers a number of benefits for network managers, as shown in the figure.
VTP Components
There are number of key components that you need to be familiar with when learning about VTP. Here is a brief description of the components, which will be further explained as you go through the chapter.
VTP Domain-Consists of one or more interconnected switches. All switches in a domain share VLAN configuration details using VTP advertisements. A router or Layer 3 switch defines the boundary of each domain.
VTP Advertisements-VTP uses a hierarchy of advertisements to distribute and synchronize VLAN configurations across the network.
VTP Modes- A switch can be configured in one of three modes: server, client, or transparent.
VTP Server-VTP servers advertise the VTP domain VLAN information to other VTP-enabled switches in the same VTP domain. VTP servers store the VLAN information for the entire domain in NVRAM. The server is where VLAN can created, deleted, or renamed for the domain.
VTP Client-VTP clients function the same way as VTP servers, but you cannot create, change, or delete VLANs on a VTP client. A VTP client only stores the VLAN information for the entire domain while the switch is on. A switch reset deletes the VLAN information. You must configure VTP client mode on a switch.
VTP Transparent-Transparent switches forward VTP advertisements to VTP clients and VTP servers. Transparent switches do not participate in VTP. VLANs that are created, renamed, or deleted on transparent switches are local to that switch only.
VTP Pruning-VTP pruning increases network available bandwidth by restricting flooded traffic to those trunk links that the traffic must use to reach the destination devices. Without VTP pruning, a switch floods broadcast, multicast, and unknown unicast traffic across all trunk links within a VTP domain even though receiving switches might discard them.
VTP allows a network manager to configure a switch so that it will propagate VLAN configurations to other switches in the network. The switch can be configured in the role of a VTP server or a VTP client. VTP only learns about normal-range VLANs (VLAN IDs 1 to 1005). Extended-range VLANs (IDs greater than 1005) are not supported by VTP. VTP Overview
VTP allows a network manager to makes changes on a switch that is configured as a VTP server. Basically, the VTP server distributes and synchronizes VLAN information to VTP-enabled switches throughout the switched network, which minimizes the problems caused by incorrect configurations and configuration inconsistencies. VTP stores VLAN configurations in the VLAN database called vlan.dat.
Two Switches
In the figure, a trunk link is added between switch S1, a VTP server, and S2, a VTP client. After a trunk is established between the two switches, VTP advertisements are exchanged between the switches. Both the server and client leverage advertisements from one another to ensure each has an accurate record of VLAN information. VTP advertisements will not be exchanged if the trunk between the switches is inactive.
Benefits of VTP
You have learned that VTP maintains VLAN configuration consistency by managing the addition, deletion, and renaming of VLANs across multiple Cisco switches in a network. VTP offers a number of benefits for network managers, as shown in the figure.
VTP Components
There are number of key components that you need to be familiar with when learning about VTP. Here is a brief description of the components, which will be further explained as you go through the chapter.
VTP Domain-Consists of one or more interconnected switches. All switches in a domain share VLAN configuration details using VTP advertisements. A router or Layer 3 switch defines the boundary of each domain.
VTP Advertisements-VTP uses a hierarchy of advertisements to distribute and synchronize VLAN configurations across the network.
VTP Modes- A switch can be configured in one of three modes: server, client, or transparent.
VTP Server-VTP servers advertise the VTP domain VLAN information to other VTP-enabled switches in the same VTP domain. VTP servers store the VLAN information for the entire domain in NVRAM. The server is where VLAN can created, deleted, or renamed for the domain.
VTP Client-VTP clients function the same way as VTP servers, but you cannot create, change, or delete VLANs on a VTP client. A VTP client only stores the VLAN information for the entire domain while the switch is on. A switch reset deletes the VLAN information. You must configure VTP client mode on a switch.
VTP Transparent-Transparent switches forward VTP advertisements to VTP clients and VTP servers. Transparent switches do not participate in VTP. VLANs that are created, renamed, or deleted on transparent switches are local to that switch only.
VTP Pruning-VTP pruning increases network available bandwidth by restricting flooded traffic to those trunk links that the traffic must use to reach the destination devices. Without VTP pruning, a switch floods broadcast, multicast, and unknown unicast traffic across all trunk links within a VTP domain even though receiving switches might discard them.
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