I am encountering an issue with my NEC SV9100 Univerge Blade Phone System Connected to a PRI with calls being dropped or losing connection intermittently. I have my Layer 3 Switch as a Cisco 3750g-12S-e and my access switches are C2960s's. I have a server farm stack that are 3750g-24PS-E. The phone LAN is connected to the server farm switches.
The connections is as follows: Blade Server/VOIP connected on VLAN 16 to the Server Farm Stack -> Router (Cisco 3750g-12S-E) -> Access Switches (C2960s).
How do I properly setup QoS over the switches and router? Thank you!
Edit: I have the access ports setup as:
Interface GigabitEthernet 1/0/1
switchport mode access
switchport access vlan 4 (Data VLAN)
switchport voice vlan 16
Are any of your switch ports showing drops?
How many units in your 3750G stack and is ring running in "full duplex"?
What IOS version(s) on all your devices?
First off, thank you for your quick reply!
I have checked the ports and none are showing drops.
There are only 2 in the stack and it is running in whatever configuration it is between Port 1 -> 2, Port 2 -> 1. I have the same configuration for 2 of my C2960s's that are next to each other.
3750g's -> 15.0.2-SE9
2960s -> 12.2.55-SE5
Sorry for the belated reply.
If you're not seeing any interface drops, that rules out some of the "easy" causes of your issue. Also without that, I'm unable to help further as the issue might also be something with the NEC or your PRI.
I figured out what the problem was. I got a hold of NEC and they said I had to add a command to the switches, because...
"The Cisco Switch (or any Cisco Device) is performing an ARP probe which we know to cause many issues but one of which is causing the system to think it has a Duplicate IP Address, hence the Duplicate IP Alarm in the system.
Please see http://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/8021x/116529-problemsolution-product-00.html on what can be done to resolve this, assuming their IT person wont already know how to disable this. Cisco refers to this I believe as 'IP ARP Probe' and that link should have information on disabling or at least making sure the Cisco devices do not apply this feature to the NEC System IP Addresses."
Thanks for the help! I hope that this helps someone else!