Query on Vocie and Data VLan on same Swithc port

Question

Hi All,
This is query regarding allowing both Vocie and data Vlans on a single switch port. I knew tehre are different ways to configure and acheive this, but not sure how techncially they are different from each other>
Way 1:
interface FastEthernet1/5
description *** IP Phone/Data Port ***
switchport trunk native vlan 10
switchport mode trunk
switchport voice vlan 16
no logging event link-status
no snmp trap link-status
mls qos trust cos
spanning-tree portfast
sh int trunk
Port      Mode         Encapsulation  Status        Native vlan
Fa1/5     on           802.1q         trunking      10
Fa1/7     on           802.1q         trunking      10
Fa1/12    on           802.1q         trunking      10
Fa1/13    on           802.1q         trunking      10
Fa1/14    on           802.1q         trunking      10
Port      Vlans allowed on trunk
Fa1/5     1-1005
Fa1/7     1-1005
Fa1/12    1-1005
Fa1/13    1-1005
Fa1/14    1-1005
Port      Vlans allowed and active in management domain
Fa1/5     1,10,16
Fa1/7     1,10,16
Fa1/12    1,10,16
Fa1/13    1,10,16
Fa1/14    1,10,16
Port      Vlans in spanning tree forwarding state and not pruned
Port      Vlans in spanning tree forwarding state and not pruned
Fa1/5     1,10,16
Fa1/7     1,10,16
Fa1/12    1,10,16
Fa1/13    1,10,16
Fa1/14    1,10,16
sh vlan-switch
VLAN Name                             Status    Ports
1    default                          active    Fa1/0, Fa1/1, Fa1/2, Fa1/3
                                                Fa1/4, Fa1/6, Fa1/8, Fa1/9
                                                Fa1/10, Fa1/11, Fa1/15
10  DVLAN                            active
16  VVLAN                            active    Fa1/0, Fa1/1, Fa1/2, Fa1/3
                                                Fa1/4, Fa1/6, Fa1/8, Fa1/9
                                                Fa1/10, Fa1/11, Fa1/15
In the above config, the port Fa 1/5 which is currnetly up and running( this port is ocnencted with IP phoen and a PC)  is not shown in sh vlan-switch output as assigned to vlan 10 or vlan 16. Not sure it is becuase the output was taken from ISR rotuer with NM 16-ESW module .
sh int fa 1/5 switchp
Name: Fa1/5
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: Disabled
Access Mode VLAN: 0 ((Inactive))
Trunking Native Mode VLAN: 10 (DVLAN)
Trunking VLANs Enabled: ALL
Trunking VLANs Active: 1,10,16
Priority for untagged frames: 0
Override vlan tag priority: FALSE
Voice VLAN: 16
Appliance trust: none
In above ocnfig, the port is configured as trunk and hence it can carry multiple vlan traffic on swithcport. As IP phones will have inbuilt switch which runs DTP by default and CDP to reciognize the conencted devcies.  I am not sure how this config works as even it's configured as trunk the DTP negotiation is disabled and how phone switch can differentiate the voice frames and data frames. Please explain in loigcal as it's known that as we have confgiured vlan 10 as native and vocie vlan 16 as trunk it carries the voice traffic.
Way 2:
interface FastEthernet1/2
description *** IP Phone/Data Port ***
switchport access vlan 10
switchport mode access
switchport voice vlan 16
no logging event link-status
no snmp trap link-status
mls qos trust cos
spanning-tree portfast
In the above config, even the port is access it's carrying multiple vlan traffic despite of being trunk port. Not sure how the trunk will be formed even DTP neogotiation is off. Isi t because of voice vlan command and if so what it deos exactly.  Please can anyone elaborate in detail. Sorry, if my post is big and confusing
sh int fa 1/2 switchport
Name: Fa1/2
Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
Administrative Trunking Encapsulation: negotiate
Operational Trunking Encapsulation: native
Negotiation of Trunking: Off

Answer 1

Switch - Phone - PC
1. First question:
     # int f0/1
     # switchport mode access
     # spanning-tree portfast
     # switchport access vlan 50
     # switchport voice vlan 10
This is the ideal way to configure and in all latest IOS Switches and in latest ISR routers, we do this as the command "switch port voice vlan" command  says to switch port that it carries the voice traffic as tagged and PC as untagged.
As we all know the default switch port of a switch will be either Dynamic auto or Dynamic Desirable which means DTP is on and in turn it means negotiation of trunking is ON. This is as per my understanding.
The Sub-Questions for 1st Question are below:
1  Does the trunk negotiation happen between Access Switch switch port and Mini 3 Port Switch within the IP Phone. If mini switch in IP PHone negotiates to form  trunk based on DTP then what’s the default switch port mode of mini switch in the IP Phone.
2. As in above config we are no where mentioning the port to be trunk. But it’s still allowing multiple vlan’s traffic to carry on access port. The switchport mode is access when you do “ sh int fa 0/1 swithcport.”.  Is it the swithcport voice vlan command does the magic?
2. Second Question:
     # int f0/1
     # switchport trunk encapsulation dot1q
     # switchport trunk native vlan 10     (data VLAN)
     # switchport mode trunk
     # swichport voice vlan 15
The Sub-Questions for 2nd Question are below:
When do we use this configuration.? In my set-up the above config is seen on 2811 ISR routers with NM-16ESW modules.  Can’t we configure the data vlan a switch port access vlan 10 , instead of trunk native vlan.