This morning, I set up a lab experiment to show my students how pruning worked. However, after we pruned, the distant switch was still getting the frames from the pruned VLAN. We know that is true because we could still ping a PC that was connected to that switch over the VLAN. By my understanding, we shouldn't have beena able to ping it any more after that VLAN was pruned towards it.
Does anyone have any information to shed some light on this mystery? URLs with a solution would be greatly appreciated.
VLAN pruning is intended to prevent Broadcast and Unknown traffic from being needlessly flooded along trunks in the case where the VLAN has no active ports on the far side of the trunk from the source of the traffic.
In that case pruning would be inappropriate since the traffic is required to cross the link.
For what it's worth I have never liked the idea anyway.
- Few such links are likely in (most) well designed networks. - Process sounds complex and potentially problem prone. - I expect that few people use it so you will be a beta tester.
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