trunks for phones voip

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My current setup for switch ports for phones with computers hanging off the phone is

interface FastEthernet0/31
switchport trunk encapsulation dot1q
switchport trunk native vlan 23
switchport mode trunk
switchport voice vlan 10
spanning-tree portfast

I have been told that this is the old method and the new way should read like

interface FastEthernet0/31
switchport access vlan 23
switchport mode access
switchport voice vlan 10
spanning-tree portfast

Both ways work fine. However, reading the top method again, the port is set to be a trunk. Let’s say I have configured 24 ports this way so they are all trunks with dot1q. The first 23 are phones with computers hanging off them and port 24 is the actual trunk port to another switch or back to the core. Does this mean that for every bit of traffic the switch receives that is not in its mac table or destined for other vlans will be flooded/propagated out of every port? Of course it cannot get anywhere for ports 1 - 23 but for port 24 it would be sent out the trunk port as normal.

If this is the case, does this mean that I am generating extra traffic on 23 ports unnecessarily?

Given that most of my configs for phones is configured like this, I am hoping to improve throughput by reconfiguring to the second method.

 

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You could configure allowed vlans on that trunk.

Then only broacasts/floods will be sent out the trunks for the vlans that you allow, your access vlan and voice vlan.

 

^ this

for the phone ports use the command

switchport trunk allowed vlan vlanid

However, i'd go to the new method personally.

 

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