Pdf vtp

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Catalyst Express series switches support only VTP transparent mode. The user must manually configure all VLANs that are used on the switch.

In this sample output from the show vtp domain command, you can see that the VTP version is set at 2. This means that the switch is VTP V2-capable. However, the switch does not run VTP V2 in this case.

At this stage, a trunk is created between the two switches. Notice how they synchronize and watch the VTP packet exchange:. Clic sends a summary advertisement to bing. With the trace command set, bing receives a summary advertisement with no followers.

Clic sends another summary advertisement with field followers to VLAN 1. The Updater Identity is the IP address of the switch that is the last to have incremented the configuration revision.

When you add, delete, or change a VLAN in a Catalyst, the server Catalyst where the changes are made increments the configuration revision and issues a summary advertisement. One or several subset advertisements follow the summary advertisement.

A subset advertisement contains a list of VLAN information. Sequence number —This is the sequence of the packet in the stream of packets that follow a summary advertisement. The sequence starts with 1. The switch has received a VTP summary advertisement with a higher configuration revision than its own. Upon receipt of an advertisement request, a VTP device sends a summary advertisement. One or more subset advertisements follow the summary advertisement. This is an example:.

Start-Value —This is used in cases in which there are several subset advertisements. VTP server is the default mode. Off configurable only in CatOS switches —In the three described modes, VTP advertisements are received and transmitted as soon as the switch enters the management domain state.

Otherwise, there is no reason to use VTP V2. Changing the VTP version from 1 to 2 will not cause a switch to reload. The password must be the same password on all those switches. However, there are occasions when VTP can create unnecessary traffic. All switches in the network receive all broadcasts, even in situations in which few users are connected in that VLAN.

VTP pruning is a feature that you use in order to eliminate or prune this unnecessary traffic. This figure shows a switched network without VTP pruning enabled. This figure shows the same switched network with VTP pruning enabled. VTP pruning takes effect several seconds after you enable it. By default, all switches are configured to be VTP servers. This configuration is suitable for small-scale networks in which the size of the VLAN information is small and the information is easily stored in all switches in NVRAM.

In a large network, the network administrator must make a judgment call at some point, when the NVRAM storage that is necessary is wasteful because it is duplicated on every switch. At this point, the network administrator must choose a few well-equipped switches and keep them as VTP servers. Everything else that participates in VTP can be turned into a client. The number of VTP servers should be chosen in order to provide the degree of redundancy that is desired in the network.

Note: It is applicable only for CatOS.