VTP question

[rburke]

I have a question about what VTP (VLAN trunking protocol) is really used for? I know that it advertises the VLAN config from the VTP server to the VTP clients, and the transparent mode just forwards, and doesn't change. But, when the server sends out its broadcasts, does it just send out the VLAN ID's or does it also send out the VLAN configuration for each interface? What I want to know, is that if a client recieves a VTP advertisement from the VTP server, will it change all the VLAN config on each interface in the client switch?

EX: SW1(server): VLAN 1 - int e0/1 - e0/5
VLAN 2 - int e0/6 - e0/12
Trunking - int fa0/26, fa0/27
SW2(client): ?????

 

[rburke]

Sorry, I meant:


Trunking - int fa0/14, fa0/15



Please help me figure out what VTP really does????

burke

 

[wybnormal]

No- normally speaking, the ports attached to a given VLAN are set locally. That is unless you are using dynamic VLANs where the port VLAN ID is set by the workstation's MAC address and a database server.

VTP carries vlan information such as the number of vlan, what the IDs of each vlan is, management domain name, subset information, version number of the vlan configuration and so on.

VTP is an easy way to spread a VLAN across the LAN to all switches in the VTP domain. Then all you do is add the ports to the VLAN instead of having create the VLAN each time you go to another switch. Need to delete a VLAN? presto.. delete it from the VTP server and it disappears from the VTP domain.


Understanding and Configuring VLAN Trunk Protocol (VTP)

http://www.cisco.com/warp/public/473/21.html

MikeS
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http://www.packetattack.com

"Take advantage of the enemy's unreadiness, make your way by unexpected routes, and attack unguarded spots."
Sun Tzu

 

[rburke]

OK.... I gotcha, that makes more sense. Thanks for the help Mike.

Great website, by the way.

burke