VTP Pruning

Prevents unnecessary flooding of broadcast information from one VLAN across all trunk links in a VTP domain and improves overall network performance. Bandwidth is freed up for other network traffic by reducing the total amount of flooded traffic on a network.

VTP pruning is disabled by default and needs to be enabled using the VTP pruning global configuration command.

VTP pruning needs to be enabled on only one VTP server switch in the domain.

Extended VLANS (1006 - 4094) are not supported by VTP version 1 and 2.

VTP version 3 supports extended VLANS (1006 - 4094)

Any other ideas about this topic are greatly appreciated.

Thanks.

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Comments

seekrit

Wait. What?

Technology1

Ask a CCNP to explain it. That's the best I can do. I personally find it somewhat complex when the term VTP Pruning is discussed. Lots of complex topics in CISCO. I guess it's not supposed to be easy but it sure is quite interesting.

seekrit wrote: »

Wait. What?

networker050184

What part are you not understanding? Asking a more specific question will probably get you more feedback.

jahsoul

Yeah, I'm kinda confused too about the original post but VTP pruning is a simple concept. (disclaimer, I'm not a CCNP..lol)

By default, a trunk port forwards multicast/broadcast for every VLAN it knows about. Pruning is the process of the switch only sending VLAN broadcast and multicast if the remote switch has ports belonging to that VLAN. (i.e., 2 switches are connected. Switch A has members on vlan 130-145 and Switch B has vlans 140-155. The switches will only send broadcast/multicast for vlans 140-145 to each other).

As usual, I might be wrong but this is how I understood VTP pruning.

Technology1

If you look at some of the Cisco books, this topic goes into detail deep.

There's a lot more involved with it than what I just posted.

jahsoul wrote: »

Yeah, I'm kinda confused too about the original post but VTP pruning is a simple concept. (disclaimer, I'm not a CCNP..lol)

By default, a trunk port forwards multicast/broadcast for every VLAN it knows about. Pruning is the process of the switch only sending VLAN broadcast and multicast if the remote switch has ports belonging to that VLAN. (i.e., 2 switches are connected. Switch A has members on vlan 130-145 and Switch B has vlans 140-155. The switches will only send broadcast/multicast for vlans 140-145 to each other).

As usual, I might be wrong but this is how I understood VTP pruning.

Akiii

Switches are advertising wich vlans are active to their neighbour switches. Neighbouring switches will just prune the vlans wich are not active on the other side of the trunk. This is how it goes, it saves bandwidth and thats all, I don't think that you can or have to go deeper than this.

chmorin

Akiii wrote: »

Switches are advertising wich vlans are active to their neighbour switches. Neighbouring switches will just prune the vlans wich are not active on the other side of the trunk. This is how it goes, it saves bandwidth and thats all, I don't think that you can or have to go deeper than this.

Agreed. With what I have studied in the professional level of switching pruning has only really been involved in limiting what vlan's get sent across trunks.