We currently have a network consisting of 3560 swtiches which have 3 VLANs:
VLAN 2 - Servers
VLAN 4 - Desktops/Laptops
VLAN 6 - IP Phones
Everything is working fine but when we copy large files (greater than 30MB) from VLAN 2 to VLAN 4 or vice versa then it gives us a network error saying "network cannot be found". If we move data from a server in VLAN 2 to another server in VLAN 2 we can copy gigs of data, same goes for moving data within VLAN 4.
Microsoft is saying that it has nothing to do with their servers but with the switches. Our desktops connect to Cisco 7941 phones which have two ports (100Mbps each) - one connects to the VLAN 6 and one to VLAN 4. VLAN 6 contains Call Manager and carries voice traffic, VLAN 4 contains only data. Since we give a higher priority to voice each port is configured as follows:
switchport access vlan 4
switchport mode access
switchport voice vlan 6
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
mls qos trust device cisco-phone
mls qos trust cos
auto qos voip cisco-phone
We have tried changing the bandwidth by changing bandwidth share to 10 10 30 50 but still no success. Any advise is welcomed. Thanks.