From: sheherezada@gmail.com
Date: Tue Jul 11 2006 - 07:14:53 ART
I thought that
switchport voice vlan
and
spanning-tree portfast
are incompatible with spanning-tree portfast.
1) Portfast is added automatically by switchport voice vlan and
portfast is typically an access mode command. Just try to configure
portfast on a trunk port and see the message.
2) If I configure a voice port as trunk, why do I need switchport voice vlan?
Bottom line, I would either configure trunk, allowed vlan and native
vlan, either configure mode access, access vlan and voice vlan.
Any insights?
Mihai
On 7/10/06, Julius Kinsler <jkinsler@harbortech.com> wrote:
> If you think it's the native vlan config you can take that away and it
> will still work another way would be:
>
> interface FastEthernet0/3
> switchport trunk encapsulation dot1q
> switchport trunk allowed vlan 10,20
> switchport mode trunk
> switchport voice vlan 20
> spanning-tree portfast
>
> This is an just another way of doing the same thing..almost. Except you
> native vlan will be diff. on the switch.
>
> Julius
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Church, Chuck
> Sent: Monday, July 10, 2006 4:10 PM
> To: Guyler, Rik; ccielab@groupstudy.com
> Subject: RE: OT - Cisco phones and Voice VLAN
>
> Thanks. I've been doing it like this as a workaround. I thought it
> would be auto-negotiated, as all the docs for the 2900XL seem to
> indicate it will. This workaround seems to keep everything working, but
> I had an odd issue crop up. It seems that the phones 'exist' on both
> VLANs when I use the manually-configured trunk. Here is one:
>
> Non-static Address Table:
> Destination Address Address Type VLAN Destination Port
> ------------------- ------------ ---- --------------------
> 000f.8fa4.981e Dynamic 251 FastEthernet0/5
> 000f.8fa4.981e Dynamic 252 FastEthernet0/5
>
> That MAC add belongs to the Cisco phone. I suppose it could be the
> phone just sending out BPDUs on the native VLAN that is causing it to
> populate both VLANs. The odd part that I was trying to fix was that a
> phone booting up seems to pull a DHCP address from the non-VoIP VLAN.
> I'm wondering if I have the switch ports do CDP announcements for
> frequent than once a minute, if it'll help the phones learn the Voice
> VLAN quicker and not try to use untagged packets for DHCP requests...
>
> Thanks,
>
> Chuck
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Guyler, Rik
> Sent: Monday, July 10, 2006 10:31 AM
> To: 'ccielab@groupstudy.com'
> Subject: RE: OT - Cisco phones and Voice VLAN
>
> Chuck, as I recall you need to add the "switchport native vlan 251" and
> "switchport mode trunk" lines to your config. The old 2900s don't use
> DTP so you have to manually config the interface to be trunk and then
> use the native vlan concept to define the data vlan. Here's the config
> from a production 3524XL I setup a few years ago, which should be about
> the
> same:
>
> interface FastEthernet0/3
> switchport trunk encapsulation dot1q
> switchport trunk native vlan 10
> switchport mode trunk
> switchport voice vlan 20
> spanning-tree portfast
>
>
> Rik
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Church, Chuck
> Sent: Monday, July 10, 2006 9:20 AM
> To: Cisco certification
> Subject: OT - Cisco phones and Voice VLAN
>
> Hey all,
>
> Sorry about the OT, but I'm having trouble getting some Cisco IP
> phones to work correctly with older 2900XL switches. The switches are
> the 8 mb variety, and running the latest 12.0 software. The config on
> the switch looks like this:
>
> interface FastEthernet0/16
> switchport access vlan 251
> switchport trunk encapsulation dot1q
> switchport voice vlan 252
> spanning-tree portfast
>
> Looking around CCO seems to indicate this is the correct way to
> do it. From the phone's menu, I can see it's being given VLAN 252 for
> it's admin VLAN. But when I look on the switch, the phone's MAC address
> shows up in VLAN 251 only. So the phone is being told correctly about
> voice VLAN, but it's either not tagging it's traffic with 252 like it
> should, or the switch is ignoring it. Any ideas?
>
> Thanks,
>
> Chuck Church
> Network Engineer
> CCIE #8776, MCNE, MCSE
> Multimax, Inc.
> Enterprise Network Engineering
> Home Office - 864-335-9473
> Cell - 864-266-3978
> cchurch@multimax.com
>
> Netco Government Services has recently acquired Multimax and is changing
> its name to Multimax Inc.
> Visit http://www.multimax.com for more information.
>
> Note: My email address has changed. Please take a moment to update your
> records with my new address.
>
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