I have Alcatel IP Phones, these ip phones are connected to cisco switch (3560) inturn PC's are conneted to this IP Phone the configuration i did in the cisco switch was
switchport access vlan 10
switchport voice vlan 20
after this these ip phones are not registering with itz call manager, i noticed the DHCP log it is getting IP address from the data vlan not from the voice vlan. I knew that it should be configured that trunk, but can any assit on this.
I am not 100% sure how Alcatel IP phones negotiate the 802.1q settings via DHCP. However, the following setting will work for Avaya phone, I suspected this should work for Alcatel also.
switchport trunk encapsulation dot1q
switchport trunk native vlan 10
switchport trunk allowed vlan 10,20
switchport mode trunk
spanning-tree portfast trunk
What type of Alcatel phone is it, does it support trunking? I would just put hte switch port in the vlan for voice and see if it registers. IF it does, you know the battle is on the phone side and how it deals with the 2 vlans. I don't believe Alcatel recognize the "voice vlan" command on the switch like the Cisco phones do. If you get me the model phone I may be able to give more info.
thanks a lot for your information, I tried yesterday with the same, but still IP Phones are not registering.
the model of IP Phone is Alcatel IP Touch 4028. I am not getting proper support from this Alcatel Engineer to check will it support trunking or not. Is there any other way to get rid off this Issue?
The other side of this how do you have DHCP configured, do you have option 150 set or something else. I believe SIP is option 66, you may want to look down this path as well.
This Ip Phone is not going through voice vlan only. It is trying to get ip from NAC Auth vlan. the DHCP options are correct in my config
I tried but still, itz the same. Is there any other work arround? i need to have different vlans voice and data. But yesterday i did some settings in the Alcatel IP Phione as mentioned below
the interface leading from the IP Phone to switch, in that i changed vlan to voice vlan but after that my Data vlan started to give issue. Any suggestions are highly appreciable
Do you mean you have the switchport voice vlan command? Or you change the native vlan to the voice vlan id?
I am trying to understand what you changed.
I have changed the VLAN from default 1 to voice vlan 10 in the IP Phone, after that IP Phones started to work, but since PC is also connected to the same IP Phone in the different vlan , it has started to give issue.
Oh, okay. Looks like the phone is not doing 802.1q trunking with the switch. Can you paste the interface configuration here?
Find the below config from switch port
switchport trunk native vlan 800
switchport trunk allowed vlan 1-23,25- 4094
switchport mode trunk
Yeah Im using 802.1q and find the output below
Switch#sh interfaces fastEthernet 0/1 switchport
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 24 (IT)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: 1-799,801-4094
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none