10-13-2018 04:41 AM - edited 03-08-2019 04:22 PM
HI
What is the difference between VTP pruning & VLAN pruning in trunk, both are configured by manually and both features prevents the VLAN frame in trunk, then what is the difference ?
Thanks in advance
Solved! Go to Solution.
10-13-2018 11:23 AM
Hello,
as Alex explained, VTP pruning is a lot easier to configure, since you only need to enable it on the VTP server. In addition, the 'switchport trunk allowed' command is static, that is, should there be a port connected to a Vlan that you actually want to traverse the trunk, you will have to manually change that, while VTP would adjust dynamically...
10-13-2018 04:49 AM
Hello,
not sure what you mean...VLAN pruning is done through VTP. Or do you mean 'trunk allowed vlan' vs VLAN pruning ?
10-13-2018 11:19 AM
Yes
Alex explained the concepts that I can understand, my question is both pruning VLAN through VTP or on the trunk itself ( ex: sw tr allowed vlan x) need to be configured manually ,
So what is the difference ? What VTP simplifies the administrator overhead in this scenario.
Thank you
10-13-2018 05:35 AM
08-11-2022 08:54 AM - edited 08-11-2022 08:55 AM
I feel Alex's post is actually the best complete answer.
Rising Star is a Shining Star
10-13-2018 11:23 AM
Hello,
as Alex explained, VTP pruning is a lot easier to configure, since you only need to enable it on the VTP server. In addition, the 'switchport trunk allowed' command is static, that is, should there be a port connected to a Vlan that you actually want to traverse the trunk, you will have to manually change that, while VTP would adjust dynamically...
10-13-2018 01:36 PM
Got it ,thank you
08-11-2022 03:39 PM - edited 08-11-2022 03:39 PM
Hello
I personally would NEVER use dynamic vtp pruning, I have seen instances even when a remote switch has had ports related to a specific vlan or even allowed to traverse the trunk vtp pruning has dynamically removed it and caused outage
Manually pruning your vlans is in my opinion the best option - It provides a total controllable approach to vtp pruning on the trunks
Enabling vtp pruning dynamically it is the easiest option to deploy granted but I have found it not deterministic enough to trust which I have found to my cost.
08-12-2022 08:49 AM
I agree. A year ago we when to 'allowed vlan' per interface. However, I have an issue that is just creeping up. I will repost as a new issue, but it would be really cool if you could comment, Paul. Thanks! The situation is that I have lost the benefit of the 'ip helper-address'.
08-12-2022 10:06 AM
The name of the new post is 'Allowed VLAN' pruning, 'ip helper-address', and DHCP.
08-14-2022 11:59 AM
Hello
haggittmark@tm-america.com wrote:
I have lost the benefit of the 'ip helper-address'.
Can you elaborate please?
08-12-2022 01:02 PM
Is the only way to forward DHCP requests to use Cisco's proprietary VTP 'ip helper-address'?
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