From: MMoniz (ccie2002@tampabay.rr.com)
Date: Wed Jul 23 2003 - 22:59:05 GMT-3
Well here is my interpretation. By default the 3550 FA ports are in dynamic
desirable state. If
a trunk capable device is detected it will try to negotiate a trunk. ( like
another switch)
If not it will be an access port in VLAN 1.
For voice capability all the config that is needed is
"switchport voice vlan #" (Of course the VLAN has to exist.)
This will put the port in access mode with a voice VLAN. If a PC is
connected to the
phone it will use VLAN 1.
If you want the PC in a different VLAN then you only need the command
"switchport access VLAN #" ( Of course this VLAN must exist also.)
Now the PC connected will use this VLAN for data traffic.
The 3524's were not like this. You needed to specify trunk parameters for it
to work correctly. I wish the 3524 were like the 3550 :). Would save a lot
of time.
-----Original Message-----
From: David zhao [mailto:zhaobaolong@boco.com.cn]
Sent: Wednesday, July 23, 2003 9:44 PM
To: MMoniz
Cc: ccielab@groupstudy.com
Subject: Re: Cat3550's Voice Vlan Question..
hi
I have the same trouble about 3550.can you give the answer in detail and
the explanation.
thanks a lot for your reply .
----- Original Message -----
From: "MMoniz" <ccie2002@tampabay.rr.com>
To: <wwwjjang@chol.com>; <ccielab@groupstudy.com>
Sent: Thursday, July 24, 2003 9:23 AM
Subject: RE: Cat3550's Voice Vlan Question..
> OK, the 3550 is different than the 3524. Since the 3550 are in the Lab
what
> a working answer is below. I verified this with Call manager and a Laptop
> connected to
> phone.
>
> interface FastEthernet0/12
> switchport access vlan 21
> switchport voice vlan 20
> no ip address
> spanning-tree portfast
>
>
>
>
> VDL-CAT#sho int fa0/12 switch
> Name: Fa0/12
> Switchport: Enabled
> Administrative Mode: dynamic desirable
> Operational Mode: static access
> Administrative Trunking Encapsulation: negotiate
> Operational Trunking Encapsulation: native
> Negotiation of Trunking: On
> Access Mode VLAN: 21 (VDL-B)
> Trunking Native Mode VLAN: 1 (default)
> Administrative private-vlan host-association: none
> Administrative private-vlan mapping: none
> Operational private-vlan: none
> Trunking VLANs Enabled: ALL
> Pruning VLANs Enabled: 2-1001
>
> Protected: false
> Unknown unicast blocked: disabled
> Unknown multicast blocked: disabled
>
> Voice VLAN: 20 (VDL-A)
> Appliance trust: none
> VDL-CAT#
>
> Ping to Phone in VLAN 20
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.115.6.3, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
> VDL-CAT#
>
> Ping to PC in VLAN 21
>
> VDL-CAT#ping 10.115.6.130
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.115.6.130, timeout is 2 seconds:
> !!!!!
> Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
> VDL-CAT#
>
>
> Thanks again Scott!!!
>
>
> M
>
>
>
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> wwwjjang@chol.com
> Sent: Wednesday, July 23, 2003 9:12 PM
> To: ccielab@groupstudy.com
> Subject: Cat3550's Voice Vlan Question..
>
>
> I have been confused by the Voice Vlan ..
> what's the right answer of the question?
>
> Q>Asssme there are cisco ip-phones attatched to port fa0/20 & fa0/21.
> - Configure voice vlan 40 for ports 0/20 & 0/21 with the native
> and data vlans set to 10
>
> --------------
> My answer1>
> --------------
> mls qos
> interface FastEthernet0/20
> mls qos trust cos
> switchport mode trunk
> switchport trunk encapsulation dot1q
> switchport trunk native vlan 10
> switchport voice vlan 40
> no ip address
> no cdp enable
> spanning-tree portfast trunk
> !
> interface FastEthernet0/21
> mls qos trust cos
> switchport mode trunk
> switchport trunk encapsulation dot1q
> switchport trunk native vlan 10
> switchport voice vlan 40
> no ip address
> no cdp enable
> spanning-tree portfast trunk
> --------------
> My answer2>
> --------------
> mls qos
> interface FastEthernet0/20
> mls qos trust cos
> switchport mode access **
> switchport access vlan 10 **
> switchport mode trunk
> switchport trunk encapsulation dot1q
> switchport trunk native vlan 10
> switchport voice vlan 40
> no ip address
> no cdp enable
> spanning-tree portfast trunk
> !
> interface FastEthernet0/21
> mls qos trust cos
> switchport mode access **
> switchport access vlan 10 **
> switchport mode trunk
> switchport trunk encapsulation dot1q
> switchport trunk native vlan 10
> switchport voice vlan 40
> no ip address
> no cdp enable
> spanning-tree portfast trunk
>
>
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