08-18-2008 08:24 AM - edited 03-06-2019 12:52 AM
ok,
I have a Mitel IP phone setup with a static IP address of 10.98.9.100/23 connected to a C3560. The port on the C3560 is setup as:
interface FastEthernet0/19
switchport trunk encapsulation dot1q
switchport trunk native vlan 104
switchport mode trunk
mls qos trust cos
end
Voice is on VLAN 108
Data is on VLAN 104
There is a PC behind the phone trying to get an IP via DHCP which is 10.98.4.20 on VLAN 104 but is not getting it...
The vlan 104 is our data vlan.
The C3560 is connetced from G0/1 to a CORE 6500 on port G1/47
G0/1 on 3560:
interface GigabitEthernet0/1
description TrunkPort to Core SW3 MOD1-47
switchport trunk encapsulation dot1q
switchport mode trunk
mls qos trust cos
end
6500 G1/47:
interface GigabitEthernet1/47
description PIPSCORPSTACKDRC
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 104,108,200,1052
switchport mode trunk
no ip address
speed 1000
duplex full
mls qos trust cos
end
I cannot for the life of me figure out why this is not working.
The weird thing is some PC's work, some dont. Seem to be tied to a system with Broadcom (DELL) nic...
Anyone have an idea?
08-18-2008 08:31 AM
Try adding:
switchport voice vlan 108
spanning-tree portfast
If no change then remove the trunk and make it an access port of vlan 104 and add those same two commands.
08-18-2008 08:47 AM
I dont think this will work, and the reason is the phone's port tag's with VLAN 108.
I sniffed the port on the switch and I do see the DHCP request comming out, with source 0.0.0.0 and dest 255.255.255.255
08-18-2008 08:59 AM
In regards to the tagging, when using that swichport voice vlan command the following happens:
"the IP phone forwards voice traffic in IEEE 802.1Q frames, tagged with the specified VLAN ID. The switch puts IEEE 802.1Q voice traffic in the voice VLAN"
08-18-2008 11:19 AM
Hello Nelson,
try making vlan 104 the native vlan or data vlan
switchport access vlan 104
switchport voice vlan 108
if you need multiple vlans after the phone
you will need to configure the PC NIC to handle 802.1Q tags.
In this way in our network we can get a PC to get via DHCP two IP addresses in different vlans.
try switchport trunk vlan native 104
But If the PC NIC doesn't support 802.1Q tagging you have to put it in a single Vlan.
Hope to help
Giuseppe
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