Im having intermittent latency problems with one of my Catalyst 4506 (Sup IV engine) multilayer switches. The device is configured as a router. Im using a bandwidth tester to measure bandwidth from my laptop to a remote device positioned on the network. I'm seeing large fluctuations in throughput when directly connected to it. On every point in my network Ive got consistent 90Mbps throughput except on this switch. When physically connected to the switch it fluctuates between 100Kbps and 30Mbps (less than half of average bandwidth everywhere else on the network).
Ive physically connected the test equipment to three different 10/100/1000 blades on the switch and have placed my laptop in all three of the VLANs assigned to it but do not see any change.
When I connect my laptop to any switch directly connected to the Catalyst 4506 and test through the 4506 to the remote end-device I get consistent 90Mbps.
Ive rebooted the switch but still have the same problem. CPU utilization is only 12% and has a lot of free memory for processing tasks.
Has anyone else seen this problem or know what it might be?