From: Hobbs (deadheadblues@gmail.com)
Date: Mon Dec 08 2008 - 19:41:33 ARST
Thank you Alexei.
But how does traffic get TO or FROM this port with vlan 0 tagged?
How does it learn MAC addresses on this vlan? Does it send it out all trunk
ports?
"Show interface trunk" does not show vlan 0 as allowed or active...
On Mon, Dec 8, 2008 at 2:17 PM, Alexei Monastyrnyi <alexeim73@gmail.com>wrote:
> Hobbs,
> as per 3550/3560 configuration guide:
>
> "Instruct the switch port to use 802.1P priority tagging for voice traffic
> and to use the default native VLAN (VLAN 0) to carry all traffic. By
> default, the Cisco IP phone forwards the voice traffic with an 802.1P
> priority of 5."
>
> HTH
>
> A.
>
>
> Hobbs wrote:
>
>> Disregard the first question...I had a freakin' ACL on R2. So the test is
>> GOOD.
>>
>> My question number 2 still remains...
>>
>> thank you,
>>
>>
>> On Mon, Dec 8, 2008 at 2:04 PM, Hobbs <deadheadblues@gmail.com> wrote:
>>
>>
>>
>>> Hello my friends,
>>>
>>> I have 2 questions regarding voice vlans:
>>>
>>> 1) Is it possible to test voice vlan by using subinterface and dot1q
>>> encapsulation on a router port:
>>>
>>> R1----SW1----SW2----R2
>>>
>>> R1 has a subinterface with "encap dot1q 2".
>>> SW1 has "voice vlan 2" on port to R1.
>>> Link SW1-SW2 is a trunk with all VLANs allowed.
>>> R2 is in vlan 2.
>>>
>>> R1's config:
>>>
>>> interface Ethernet0/0
>>> !
>>> interface Ethernet0/0.2
>>> encapsulation dot1Q 2
>>> ip address 139.1.2.101 255.255.255.0
>>>
>>> SW1:
>>>
>>> interface FastEthernet0/1
>>> switchport access vlan 11
>>> switchport mode access
>>> switchport voice vlan 2
>>> spanning-tree portfast
>>>
>>> Should R1 be able to ping R2 at 139.1.2.2 ? As of right now, I am not
>>> able
>>> to. When I debug icmp, packets from R2 reach R1, but packets from R1
>>> never
>>> get to R2. Looks like SW1 is not sending packets from the voice vlan over
>>> its trunk to SW2.
>>>
>>> 2) What vlan # is used when you configure "switchport voice vlan dot1p"?
>>> How does the switch know when to send traffic TO this port on the voice
>>> vlan.
>>>
>>> thank you,
>>>
>>>
>>
>>
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