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VLAN Pruning

Is is a good idea to enable VLAN pruning on switch stacks or does this add to more CPU usage which could cause other problems. The network consists of 3750,3500 and 2900 switches.

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Cisco Employee

Re: VLAN Pruning

Hi,

Pruning unneeded vlans off of trunks is a good idea, and may actually lower your CPU utilization, as the number of STP instances may be reduced as well.

From the best practices doc:

http://www.cisco.com/en/US/products/hw/switches/ps700/products_white_paper09186a00801b49a4.shtml

"VLANs can be pruned from trunks down to switches that do not have ports in the VLAN. This results in frame flooding that is more bandwidth-efficient. Manual pruning also has a reduced spanning-tree diameter. A per-switch VLAN configuration also encourages this practice."

HTH,

Bobby

*Please rate helpful posts.

1 REPLY
Cisco Employee

Re: VLAN Pruning

Hi,

Pruning unneeded vlans off of trunks is a good idea, and may actually lower your CPU utilization, as the number of STP instances may be reduced as well.

From the best practices doc:

http://www.cisco.com/en/US/products/hw/switches/ps700/products_white_paper09186a00801b49a4.shtml

"VLANs can be pruned from trunks down to switches that do not have ports in the VLAN. This results in frame flooding that is more bandwidth-efficient. Manual pruning also has a reduced spanning-tree diameter. A per-switch VLAN configuration also encourages this practice."

HTH,

Bobby

*Please rate helpful posts.

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