From: NET HE (he_net@hotmail.com)
Date: Thu Aug 30 2007 - 22:52:09 ART
Give you an example, then you will understand it.
Let's say there are 3 switches linked by trunks in a VTP domain, switch1 as
vtp server, other 2 as vtp clients.
Switch1 has host A1, B1, C1 connected to VLAN 1, 2, 3 respectively, switch2
has hosts A2, B2, C2 connected to VLAN 2, 3, 4 respectively, and switch3 has
hosts A3, B3, C3 connected to VLAN 1, 2, 3 respectively
After a period of silence, A1 is trying to ping A3, A1 first will send an
ARP broadcast asking for MAC address of A3. If VTP pruning is not on at
switch2, you will see ARP message on the trunk between switch1 and switch2,
switch1 and switch3. But if VTP prunning is on at switch2, switch2 has
already reported to switch1 saying that I don't have any hosts at VLAN 1,
please don't send any VLAN 1 traffic to me. Therefore you will only see that
ARP message on the trunk between Switch1 and Switch3, not the trunk between
Switch1 and Switch2.
Best Regards,
Net (Xin) He
>Hello,
>
>I've never really understood VTP Pruning.
>
>Sure I know that it reduces VTP traffic and is enabled using the "vtp
>pruning" syntax, but I've never seen this deployed in any networks.
>
>Has anyone got any experiences with this or can share light on this matter
>?
>
>Thanks, Thomas
>
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