From: Mustafa M Bayramov (spyroot@azeronline.com)
Date: Sat Aug 09 2003 - 19:29:14 GMT-3
I believe that switchport trunk encapsulation dot1q need to be
configured in old cisco switches that doesn't supported voice VLAN.
Cisco can test your ability to understand why you need to setup
statically trunk to IP phone.
Actually it's proctor question.
Regards
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Marcus Jensen
Sent: Thursday, August 07, 2003 9:16 AM
To: 'Tomasz Szymanski'; ccielab@groupstudy.com
Subject: RE: Connecting IP Phone 7960 to CAt3550
Tomas
The answer provided for lab 36 is not wrong, but it is misleading. There
are
two different questions in that lab. I am only referring to the one
where
the command 'sw mode trunk' is NOT used.
Version 1:
interface FastEthernet0/11
switchport access vlan 102
switchport voice vlan 101
switchport trunk encapsulation dot1q <----This command is unnecessary.
switchport priority extend cos 0
no ip address
mls qos cos 1
mls qos cos override
spanning-tree portfast
You can verify this command is unnessary by using 'sw trunk
encap isl' here
instead. 7960s only support dot1q so you might think the phone will
break
with encap ISL, but it will continue to work. In access or dynamic mode,
voice vlan uses dot1q and overrides trunk encap command. When I changed
to
static trunk mode with ISL encap, then my 7960s and call manager finally
failed. See a post I made about 3 weeks ago for more details.
Marcus
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Tomasz Szymanski
Sent: Thursday, August 07, 2003 7:10 PM
To: ccielab@groupstudy.com
Subject: Connecting IP Phone 7960 to CAt3550
Hi group,
Studying IPexperts lab 36 I found two solutions for connecting Cisco IP
Phone to cat. Can you explain me the differences and when the
configurations should be used?
Version 1:
interface FastEthernet0/11
switchport access vlan 102
switchport voice vlan 101
switchport trunk encapsulation dot1q
switchport priority extend cos 0
no ip address
mls qos cos 1
mls qos cos override
spanning-tree portfast
Version2
interface FastEthernet0/12
switchport trunk encapsulation dot1q
switchport trunk native vlan 202
switchport mode trunk
switchport voice vlan 201
no ip address
spanning-tree portfast
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