Please note as of the time of writing this post VTP pruning is NOT supported in Packet Tracer. If you haven’t read through my VLAN and trunking posts you might want to do that. VTP pruning requires that you know a fair bit of information on those two subjects. Here’s a bit of an over view:
Trunks ports belong to ALL VLANS. This leads to and issue that the trunk will forward broadcasts and multicasts for ALL VLANS it knows about… Regardless of whether the remote switch actually has any ports in that VLAN.
VLANS 2-1001 are able to be pruned. You can’t prune VLAN 1. You can’t enable pruning on a VTP client. VTP is disabled by default. To enable it you need to type a single command. That command is:
- conf t
- vtp pruning
To verify that VTP pruning is running or not run the command:
- show vtp status
Take this example… We have two switches “s0” and “s1”.
- s0 –> VLANS 2 – 11
- s1 –> VLANS 10 – 19
After enabling VTP pruning only the broadcasts and multicasts from VLANS 10 and 11 will cross the trunk. This might help reduce network congestion.