Pruning

Pruning

Pruning is the process of deleting irrelevant parts of a belief network before invoking inference

 
VTP pruning prevents unnecessary flooding of broadcast information from one VLAN across all trunks in a VTP domain. –VTP pruning permits switches to negotiate which VLANs are assigned to ports at the other end of a trunk and, hence, prune the VLANs that are not assigned to ports on the remote switch.

VTP pruning permits switches to negotiate which VLANs are assigned to ports at the other end of a trunk and, hence, prune the VLANs that are not assigned to ports on the remote switch. –Pruning is disabled by default. 

 VTP pruning is enabled using the vtp pruning global configuration command. –You need to enable pruning on only one VTP server switch in the domain. 

 If a VLAN is eligible for pruning, it is said to be prune eligible. By default, all VLANs on a Cisco Catalyst switches are prune eligible, except for VLAN 1. Cisco Catalyst switches can be configured with a custom prune eligible list, which ensures specific VLANs are never pruned from a trunk.

 LAB

 We are going to configure for this exercise a VLAN 80 assigned to interface fa0/15

 We will allow only VLAN 1 and 50

Now let's check another way to get the same results, we initially will allow everything but will make an exception with VLAN 80

We show you how to do some pruning in our network.This lab was successful!