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Chapter 3
VLANs
Configuration Revision Number
The revision number is the most important piece in the VTP advertisement.
Figure 3.7 shows an example of how a revision number is used in an
advertisement.
F I G U R E 3 . 7
VTP revision number
Figure 3.7 shows a configuration revision number as N. As a database is
modified, the VTP server increments the revision number by 1. The VTP
server then advertises the database with the new configuration revision
number.
When a switch receives an advertisement that has a higher revision num-
ber, then the switches will overwrite the database in NVRAM with the new
database being advertised.
Configuring VTP
There are several options that you need to be aware of before attempting to
configure the VTP domain:
1.
Consider the revision number of the VTP you will run.
2.
Decide if the switch is going to be a member of an already existing
domain or if you are creating a new one. To add it to an existing
domain, find the domain name and password, if used.
3.
Choose the VTP mode for each switch in the internetwork.
1. Add new VLAN
2. N+1
4. N+1
5. Sync new VLAN info
3
3
4. N+1
5. Sync new VLAN info
VTP advertisements are sent every five
minutes or whenever there is a change.
Client
Client
Server
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