04-10-2003 07:43 AM - edited 03-12-2019 11:25 PM
Hi,
We are using 2 Vlans
Vlan 1: PCs
Vlan 2: IP Telephony
Callmanager is DHCP-Server to the IP Phones.
There is Inter-VLAN Routing between the Vlans.
At the 2950 switch there is
switchport voice vlan configured on the interface.
But only the PC connected behind the Ip Phon is working OK.
Any ideas what is wrong in this case.
reg. August
04-10-2003 07:52 AM
do you have the port setup as a trunk with dot1q encapsulation?
interface FastEthernet0/X
switchport trunk encapsulation dot1q
switchport mode trunk
switchport voice vlan X
spanning-tree portfast
you might need to add in :
switchport trunk native vlan XXX
if you nativ trunk is something other than the default
don't forget QOS...
04-10-2003 09:51 AM
August,
Are you saying the phone isn't working but the PC is?
Is the Call manager in the same subnet as the phones? if so do not set the vlan on the switchport as the data vlan but make it the phone VLAN, because the call manager will not go into the voice Vlan on its own.
Also make sure you do not use vlan 1 for either the data or voice vlan, especially if you are putting DHCP servers into each VLAN. I've come accross problems whereby a PC booting from behind a phone will be given an address by the DHCP server for the phones, even though it's not the correct VLAN , just because the data VLAN was VLAN 1, hey set it to anything else and no problems.
Hope this helps
Paul
04-10-2003 10:33 AM
probably you didnt configure the router to forward the bootp requests from ip phones to the dhcp server in the data vlan..
interface vlan 2
ip helper-address 10.1.1.1 (your dhcp server)
04-11-2003 02:46 AM
Hi,
Thanks for your replies.
The solution in this case.
The port settings have to set to 100full
reg. August / NTS
04-11-2003 08:07 PM
Won't that lead to a duplex mismatch since the phones can only run auto?
04-12-2003 12:12 AM
No,
You can set also the CP7960/40 ip phones to 100 full. (the default is auto)
Unlock the phone and change the settings
So we set the switchport to 100full, the phone on both ports to 100full and the pc to 100 full.
We had similiar problems with the speed/duplex-settings in the past.
Phones were rebooting all time --> port settings
PC has bad performance --> port settings
August
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