| Jonathan Charles 2006-11-24, 1:11 pm |
| A cisco IP Phone (794X/796X/707X, etc.) plugged into a newer Catalyst switch
will automatically (via CDP) negotiate the dot1Q trunk (it is doing it in
the background, so you will not see it).
We have noticed with the 7935 and 7936 conference phones (built by Polycom)
that sometimes (depending on firmware version) they cannot do a trunk (since
they don't have an access port, there really is no need), so it is easier
just to nail them in as access ports on the voice vlan.
I would recommend your first option, just to match with the SRND. The second
option is really for non-Cisco IP phones (which cannot negotiate the trunk).
Jonathan
On 11/24/06, Ruben Montes (Europe) <Ruben.Montes@eu.didata.com> wrote:
>
> Hello,
>
> I have always configured the switch IOS ports where IP phones are
> connected this way:
>
> int fa0/1
>
> switchport access vlan DATA
>
> switchport voice vlan VOICE
>
> switchport mode access
>
> spanning-tree portfast
>
>
>
> But I've seen in the CCVP courses that the configuration is different:
>
> interface fastethernet 0/1
>
> switchport trunk encapsulation dot1q
>
> switchport trunk native vlan DATA
>
> switchport mode trunk
>
> switchport voice vlan VOICE
>
> spanning-tree portfast
>
> Can anybody explain me the differences between them and if any of them
> have any advantage respect the other one? I prefer the first one rather than
> the second, I don't like to configure a trunk to connect a phone, but I want
> to understand why cisco recommends the second configuration respect the
> first one?
>
> Thanks in advance,
>
> Ruben
>
> ________________________________________
_______
> cisco-voip mailing list
> cisco-voip@puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
>
>
|