Vtp domain currently not in updating state

Make sure the revision number is lower than the production server mode switch.

An easy way to ensure that a new switch does not affect the operation of the other switches in the VTP domain is to simply change the domain name of the new switch to something bogus and back to the valid domain name.

As noted earlier, the trunk port is used to send the VTP information to the adjacent switch.

The dynamic process using server/client mode is administratively palatable because it is easy to implement; a server switch is configured with VLANs, and the rest of the switches in that domain receive that information.

On the other hand, server/client mode can pose potential risks on the network, which will be discussed in this section shortly.

In Example 4-3, the switch receives information about VLANs 12, 30, 34, 100, and notification of a new VLAN, 111.

This output can be collected using the VTP/Active: Opening vlan_EVENT_ET event - vlan=vlan12 mode=3 VTP/Active: Closing event VTP/Active: Opening vlan_EVENT_ET event - vlan=vlan30 mode=3 VTP/Active: Closing event VTP/Active: Opening vlan_EVENT_ET event - vlan=vlan34 mode=3 VTP/Active: Closing event VTP/Active: Opening vlan_EVENT_ET event - vlan=vlan0100 mode=3 VTP/Active: Closing event VTP/Active: Opening vlan_EVENT_ET event - vlan=vlan0111 mode=1 vtp_vlan_change_notification: vlan = 111, mode = 1 2003 Sep 04 .110 set Vtp Vlan Information: vlan No [111], mode [1], remote Sp an [0], remote_span [0] primary[0] PType[0], mistp[0] 2003 Sep 04 .250 An advertisement request is sent when a switch has rebooted, the domain name has been changed, or the VTP summary revision number is higher than what is locally on the switch.

A domain name is simply a unique identifier up to 32 characters long used to identify the switches that will share the same VTP information. VTP packets are sent to destination address 01-00-0C-CC-CC-CC with a SNAP type of 0x2003.

Each switch can operate in one of three modes: In server mode, the switch has a list of all the VLANs for that domain.If the number is the same or lower, the switch ignores the summary advertisement.In Example 4-2, the debug output shows that the switch received a summary advertisement that has a lower revision number than the one that is currently on the switch. If the revision number is higher, it will update the VLAN database with the information received.In transparent mode, a switch does not participate in VTP; it merely passes the VTP advertisements to other switches.In transparent mode, the switch can be configured to add, delete, and modify, and the information is stored in NVRAM.In Figure 4-4, two VLANs extend over multiple switches using trunking.

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