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voip config advice

hi anyone,

the below configuration is what i would normally add on my cisco switch:

int fa0/1
switchport mode access
switchport access vlan 10
switchport voice vlan 20
mls qos trust cos
mls qos trust device cisco-phone
switchport priority extend cos <0-7>

question 1.  it would be appreciated if i could receive some advice on the below:

note: i have the cisco book explaining the below but i fail to understand it in practical terms although i do have cisco knowledge!!

- switchport voice vlan vvid - i think the above matches this method
- switchport voice vlan dot1p - when do i use this method  ?
- switchport voice vlan untagged - what does this relate to  ?
- switchport voice vlan vlan none - I think used when nothing is attached
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mikey250
Asked:
mikey250
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2 Solutions
 
eeRootCommented:
"Switchport voice vlan ##" is the commonly used command to set the VOIP VLAN tag number.

"Switchport voice vlan dot1p" is used to tag VOIP traffic if the VOIP and user data traffic are on the same VLAN.

"Switchport voice vlan untagged" sets VOIP traffic to not use a VLAN tag, the command is available in IOS but rarely used in the real world.

"Switchport voice vlan vlan none" is used to clear an existing setting and/or reset a port back to defaults.
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mikey250Author Commented:
hi eeroot,

i was under the impression that when using a pc and ip phone that both were always on separage vlans, as i did not know (dot1p) allows both devices to be on same vlan - could you possibly explain in some practical way, as why both devices can share same vlan  ?
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eeRootCommented:
Networks might be set up with IP phones and PC's on the same VLAN if there is a lack of network hardware with VLAN support, or maybe a novice network admin is not sure how to set up multiple VLAN's.
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mikey250Author Commented:
morning,

i can setup router-on-stick, and intervlan routing with multiple vlans going across trunks for example....

you say "lack of network hardware" - could you give me an example  ?

or maybe "a novice network admin is not sure how to setup multiple vlans" - this seems odd  ?

i am aware of ccna voice - but assumed this was to do with (mainly) running a (network that is all connected together) and then allows for free phonecalls as long as local within the actual network - i assumed

i am aware of ccnp voice - but assumed this was more to do with cisco call manager/external network calls where some charge may or may not apply, but again reduce the phone bill drastically - i assumed

not sure if you could also shed some insight to my understanding for above ccna voice & ccnp voice - comments  ?
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mikey250Author Commented:
i do appreciate the advice but still somewhat unclear but have allocated the points as some of your comments i can use to move forward with as i have also made a note.

appreciated!
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