The Vtp Domain - Cisco Catalyst 2960 Software Configuration Manual
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Also See for Catalyst 2960:
- Configuration manual (2288 pages) ,
- Command reference manual (800 pages) ,
- Hardware installation manual (108 pages)
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Understanding VTP
The switch supports 255 VLANs, but the number of configured features affects the usage of the switch
hardware. If the switch is notified by VTP of a new VLAN and the switch is already using the maximum
available hardware resources, it sends a message that there are not enough hardware resources available
and shuts down the VLAN. The output of the show vlan user EXEC command shows the VLAN in a
suspended state.
The switch supports up to 64 VLANs when it is running the LAN Lite image.
Note
VTP version 1 and version 2 support only normal-range VLANs (VLAN IDs 1 to 1005). Cisco IOS
Release 12.2(52)SE and later support VTP version 3. VTP version 3 supports the entire VLAN range
(VLANs 1 to 4094). Extended range VLANs (VLANs 1006 to 4094) are supported only in VTP
version 3. You cannot convert from VTP version 3 to VTP version 2 if extended VLANs are configured
in the domain.
Note
The switch must be running the LAN base image to support VTP version 3.
These sections contain this conceptual information:
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The VTP Domain
A VTP domain (also called a VLAN management domain) consists of one switch or several
interconnected switches or switch stacks under the same administrative responsibility sharing the same
VTP domain name. A switch can be in only one VTP domain. You make global VLAN configuration
changes for the domain.
By default, the switch is in the VTP no-management-domain state until it receives an advertisement for
a domain over a trunk link (a link that carries the traffic of multiple VLANs) or until you configure a
domain name. Until the management domain name is specified or learned, you cannot create or modify
VLANs on a VTP server, and VLAN information is not propagated over the network.
If the switch receives a VTP advertisement over a trunk link, it inherits the management domain name
and the VTP configuration revision number. The switch then ignores advertisements with a different
domain name or an earlier configuration revision number.
Caution
Before adding a VTP client switch to a VTP domain, always verify that its VTP configuration revision
number is lower than the configuration revision number of the other switches in the VTP domain.
Switches in a VTP domain always use the VLAN configuration of the switch with the highest VTP
configuration revision number. If you add a switch that has a revision number higher than the revision
number in the VTP domain, it can erase all VLAN information from the VTP server and VTP domain.
See the
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
14-2
The VTP Domain, page 14-2
VTP Modes, page 14-3
VTP Advertisements, page 14-4
VTP Version 2, page 14-5
VTP Version 3, page 14-5
VTP Pruning, page 14-6
VTP and Switch Stacks, page 14-8
"Adding a VTP Client Switch to a VTP Domain" section on page 14-17
Chapter 14
Configuring VTP
for the procedure for
OL-26520-01
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