[c-nsp] Data VLAN/Voice VLAN

[Geoffrey Pendery]

"A compatible device (i.e. one the presents itself as a phone via CDP)
would activate the voice VLAN and thus allow tagged incoming traffic
on VLAN 66. This requires the switch (and port) to have CDP enabled by
the way."


Can also be done with LLDP, should you have non-Cisco IP phones.  I
can vouch for 4500's and Avaya IP phones speaking LLDP to each other.


-Geoff


On Fri, Aug 28, 2009 at 5:43 PM, Peter Rathlev<peter at rathlev.dk> wrote:
> On Fri, 2009-08-28 at 15:20 -0700, Yuri Bank wrote:
>> interface FastEthernet0/4
>>  description phone
>>  switchport access vlan 77
>>  switchport trunk native vlan 55
>>  switchport mode access
>>  switchport voice vlan 66
>>
>> In this configuration, data is placed on vlan 55? From what I've read
>> on other forums and such is that the data would be on the configured
>> access vlan ( 77 ). Unfortunately I do not have an iphone to test
>> this. Could anyone give me some clarity?
>
> Untagged traffic on the port would be VLAN 77, since this is what you
> configured at access VLAN and since the port is in forced access mode.
>
> A compatible device (i.e. one the presents itself as a phone via CDP)
> would activate the voice VLAN and thus allow tagged incoming traffic on
> VLAN 66. This requires the switch (and port) to have CDP enabled by the
> way.
>
> The trunk configuration is ignored when you issue "switchport mode
> access".
>
> If you only need a stand-alone phone you can just use a simple access
> port in the voice VLAN.
>
> Regards,
> Peter
>
>
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