I have a network with two switches at the core. One is a SLM 2048 and the other is a 3524.
The 3524 is setup with a few Vlans and Voip and switches our Internet connection. It is only connected to 7940 phones (about 10) and the SLM 2048.
The SLM 2048 is connected to PCs (about 25) and the 3524.
The issue I am having is when I do a major operation like copying a CD from a workstation to a server, which are both connected to the 2048, the network seems to be completly
saturated with traffic. The VOIP audio gets metallic or worse, and any simple network transaction takes a very long time or just times out. When
doing this the workstation shows a usage of about 5-8% of the network connection (50-80 mbps), all the PC's on the network are Gigabit machines.
What should I check to try to see why this is happening?