RE: Voice VLAN and data traffic with and without trunking mode

From: Jung, Jin (jin.jung@lmco.com)
Date: Thu Jun 26 2003 - 15:11:07 GMT-3

I think
You need put "switchport encap trunk dot1q" for second option.
But not "switchport mode trunk".

For the second option, port will except trunk encapsulated packets, but it
will be ISL not DOT1q, since most of Cisco phone, if not all, will only
support DOT1Q trunking.

jin jung...

-----Original Message-----
From: James.Jackson@broadwing.com [mailto:James.Jackson@broadwing.com]
Sent: Thursday, June 26, 2003 1:58 PM
To: chenry@reuna.cl
Cc: ccielab@groupstudy.com
Subject: RE: Voice VLAN and data traffic with and without trunking mode
co nfigured

The two options look fine. As I understand it, in case 2, the port is not
configured as a trunk however it is still able to process the 802.1Q packets
coming from IPphone.

James

-----Original Message-----
From: Cristian Henry H [mailto:chenry@reuna.cl]
Sent: Thursday, June 26, 2003 12:48 PM
Cc: ccielab@groupstudy.com
Subject: Voice VLAN and data traffic with and without trunking mode
configured

Dear all,

If the requirement is to put the voice traffic (from IP Phone) in VLAN
101 and the data traffic (from behind IP Pone)in VLAN 102, what do you
think about the following cases/configurations?, Do both ones the same?

1) With 802.1q trunking mode configured
 
interface FastEthernet0/10
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 102
 switchport mode trunk
 switchport voice vlan 101
 no ip address
 spanning-tree portfast
!

2) Without 802.1q trunking mode configured

interface FastEthernet0/10
 switchport access vlan 102
 switchport voice vlan 101
 spanning-tree portfast
!
In this 2) case, Does the port get automatically trunking mode 802.1q?,
is necesary to add " switchport trunk encapsulation dot1q"?, and if the
port is trunk, does the "switchport access vlan 102" works well?

Thanks in advance. 

-- 
Cristian E. Henry
REUNA

E-mail: chenry@reuna.cl
Fono: 56-2-3370336

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