11-01-2009 02:41 AM - edited 03-06-2019 08:24 AM
Dear All,
I am facing a problem that I configured the following commands on the ports of 3750 switch for Voice and data vlan
switchport mode access
switchport access vlan 5
switchport voice vlan 10
The problem is that we are using siemens IP phone for ip telephony. The phones are getting power from the switch and able to ping other phones within the same subnet but however they neither communicating with their default gateway on the switch nor the other vlans created on the switch.
However the other vlans excepts voice vlan are communicating with other.
Kindly help me in this scenario why the IP phones are not able to communicate with other vlans and their default gateway.
Regard,
Shahzad Iqbal
Solved! Go to Solution.
11-03-2009 02:17 AM
You are making a misstake here. The Siemens ip phone will NOT automatically join the voice vlan.
Without configuration, they will use the native vlan (5) instead.
This would explain your issue.
You can verify this by checking to which vlan the phone's mac addresses belong.
(sh mac-addr)
regards,
Leo
11-01-2009 03:30 AM
Dear Shahzad,
I think you need to configure this port as a trunk and allowed these vlans because you are trying to connect non-cisco phone with this Cisco switch.
Following configuration may help you:
switchport trunk encapsulation dot1q
switchport mode trunk
switchport trunk allowed vlan 5,10
switchport trunk native vlan 5
Regards,
Anser
11-01-2009 04:50 AM
Are the phones pulling an address and appropriate default gateway ? If so then then layer 3 is working right. Make sure the default gateway assigned to the phone matches your layer 3 address for that vlan . Check dhcp scopes. Normally you should not have to trunk and the voice vlan setup you have should work ok.Do an extended ping sourcing it from the voice vlan default gateway address , if they aquired an address the phone then they should respond as it is sourced from the default gateway address. As a final consult the Siemens manual on what they normally use as a setup.
11-03-2009 01:16 AM
Hi,
The siemens IP phones are not able to ping their default gateway although the ip phones and the default lies in the same subnet.
kindly help me how I can resolve this issue.
11-03-2009 01:45 AM
Please verify that the voice vlan (10) existst on all intermediate switches between the ip phone and the def-gw.
Also, all links between switches must be configured as dot1q trunks.
regards,
Leo
11-03-2009 01:58 AM
These are 3750 switches and they are all connected via stack cables. Physically they are 3 switches but logically they are one due to stack feature.
11-03-2009 02:04 AM
OK, this will not be the problem then.
Re-reading your initial description, I got the impression that you may not have configured the phones to use vlan ID 10. Hence, they will use the datavlan to communicate (native, untagged) and the gw of the voice vlan will be unreachable.
You may have assigned ip adresses to the phones manually?
11-03-2009 02:12 AM
I already statically assign ip address to the IP phones they are communicating to each other but not to the default gateway and other vlans. Default gateway ip address and ip phones are on the same subnet.
kindly see the configuraiton below so you will have a better idea.
interface GigabitEthernet2/0/15
switchport access vlan 5
switchport mode access
switchport voice vlan 10
srr-queue bandwidth share 10 10 60 20
queue-set 2
priority-queue out
mls qos trust cos
auto qos voip trust
spanning-tree portfast
interface Vlan5
ip address 172.27.121.1 255.255.255.0
ip helper-address 172.27.122.250
interface Vlan10
ip address 172.27.123.1 255.255.255.0
ip helper-address 172.27.122.250
11-03-2009 02:17 AM
You are making a misstake here. The Siemens ip phone will NOT automatically join the voice vlan.
Without configuration, they will use the native vlan (5) instead.
This would explain your issue.
You can verify this by checking to which vlan the phone's mac addresses belong.
(sh mac-addr)
regards,
Leo
11-03-2009 02:51 AM
Hi,
Good man! you have solved my issue thank you very much.
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: