Unit 1: Network Infrastructure
This will allow you to demonstrate your networking skills, knowledge, and abilities, with a focus on enterprise-level switching, routing, and multicast components that support cross-platform (inter)operability and integration with the most recent software-defined technologies.
VTP Pruning & Manual Pruning
VTP Pruning
- VTP pruning has a dynamic feature that configures automatically the allowed VLAN lists on trunks in a VTP domain instantly.
- A switch tells the remote switch on the other side of a trunk that data from an inactive VLAN should not be sent across a trunk based on whether or not ports on the switch are currently active within a VLAN.
- VTP pruning stops traffic from flooding VLANs that isn’t needed on trunk ports that are on the list of ports that can be pruned.
- By default, only VLANs that are on the pruning-eligible list (VLANs 2-1001) can be pruned.
- Pruning does not apply to extended-range VLANs.
- All versions of VTP support pruning.
- You can enable pruning for the full management domain by turning on VTP pruning on a VTP server.
- Pruning eligibility for VLANs on that trunk alone (not on all switches in the VTP domain) is affected when VLANs are made pruning-eligible or pruning-ineligible.
- In VTP transparent mode, VTP pruning will not work as intended.
- As a general rule, VTP pruning is not enabled.
- Using the vtp pruning command, we can enable VTP Pruning on VTP Server.
- To configure an interface’s VTP pruning suitable list, use theswitchport trunk pruning vlan a,b-z. This command does the exact opposite of what changing the VLAN allowed list does. If a VLAN is taken off the list of VTP pruning eligible VLANs, the switch will report that it needs traffic for that VLAN even though it doesn’t have any live ports in that VLAN.
- VLANs that have been VTP pruned on a trunk still remain in the spanning tree. In actuality, VTP pruning has no effect on the total number of instances of spanning trees.
Example:
Switch#show interface Fa0/23 pruning
Port Vlans pruned for lack of request by neighbor
Fa0/23 5,7-10,22,43,58
Port Vlan traffic requested of neighbor
Fa0/23 1,5,7-10,22,43,58
The field called “VLANs pruned for lack of request by neighbor” shows which VLANs the neighbor did not ask for.
In the Vlan traffic requested of neighbor field, it shows which VLANs the local switch told its neighbour that it needs. Either these VLANs are linked to certain local ports on the switch, or the switch is in the Layer 2 path for these VLANs.
Manual Pruning
- Trunk ports permit traffic for all VLANs by default.
- VTP pruning is limited to directing a switch to not to request traffic for particular VLANs.
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